948 lines
27 KiB
C
948 lines
27 KiB
C
/* USB Serial Example for Teensy USB Development Board
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* http://www.pjrc.com/teensy/usb_serial.html
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* Copyright (c) 2008,2010,2011 PJRC.COM, LLC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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// Version 1.0: Initial Release
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// Version 1.1: support Teensy++
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// Version 1.2: fixed usb_serial_available
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// Version 1.3: added transmit bandwidth test
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// Version 1.4: added usb_serial_write
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// Version 1.5: add support for Teensy 2.0
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// Version 1.6: fix zero length packet bug
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// Version 1.7: fix usb_serial_set_control
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#include <string.h>
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#define USB_SERIAL_PRIVATE_INCLUDE
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#include "usb_serial.h"
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/**************************************************************************
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*
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* Configurable Options
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*
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**************************************************************************/
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// You can change these to give your code its own name. On Windows,
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// these are only used before an INF file (driver install) is loaded.
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#define STR_MANUFACTURER L"Your Name"
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#define STR_PRODUCT L"USB Serial"
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// All USB serial devices are supposed to have a serial number
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// (according to Microsoft). On windows, a new COM port is created
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// for every unique serial/vendor/product number combination. If
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// you program 2 identical boards with 2 different serial numbers
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// and they are assigned COM7 and COM8, each will always get the
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// same COM port number because Windows remembers serial numbers.
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//
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// On Mac OS-X, a device file is created automatically which
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// incorperates the serial number, eg, /dev/cu-usbmodem12341
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//
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// Linux by default ignores the serial number, and creates device
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// files named /dev/ttyACM0, /dev/ttyACM1... in the order connected.
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// Udev rules (in /etc/udev/rules.d) can define persistent device
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// names linked to this serial number, as well as permissions, owner
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// and group settings.
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#define STR_SERIAL_NUMBER L"12345"
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// Mac OS-X and Linux automatically load the correct drivers. On
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// Windows, even though the driver is supplied by Microsoft, an
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// INF file is needed to load the driver. These numbers need to
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// match the INF file.
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#define VENDOR_ID 0x16C0
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#define PRODUCT_ID 0x047A
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// When you write data, it goes into a USB endpoint buffer, which
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// is transmitted to the PC when it becomes full, or after a timeout
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// with no more writes. Even if you write in exactly packet-size
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// increments, this timeout is used to send a "zero length packet"
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// that tells the PC no more data is expected and it should pass
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// any buffered data to the application that may be waiting. If
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// you want data sent immediately, call usb_serial_flush_output().
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#define TRANSMIT_FLUSH_TIMEOUT 5 /* in milliseconds */
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// If the PC is connected but not "listening", this is the length
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// of time before usb_serial_getchar() returns with an error. This
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// is roughly equivilant to a real UART simply transmitting the
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// bits on a wire where nobody is listening, except you get an error
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// code which you can ignore for serial-like discard of data, or
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// use to know your data wasn't sent.
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#define TRANSMIT_TIMEOUT 25 /* in milliseconds */
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// USB devices are supposed to implment a halt feature, which is
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// rarely (if ever) used. If you comment this line out, the halt
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// code will be removed, saving 116 bytes of space (gcc 4.3.0).
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// This is not strictly USB compliant, but works with all major
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// operating systems.
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#define SUPPORT_ENDPOINT_HALT
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/**************************************************************************
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*
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* Endpoint Buffer Configuration
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*
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**************************************************************************/
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// These buffer sizes are best for most applications, but perhaps if you
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// want more buffering on some endpoint at the expense of others, this
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// is where you can make such changes. The AT90USB162 has only 176 bytes
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// of DPRAM (USB buffers) and only endpoints 3 & 4 can double buffer.
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#define ENDPOINT0_SIZE 16
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#define CDC_ACM_ENDPOINT 2
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#define CDC_RX_ENDPOINT 3
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#define CDC_TX_ENDPOINT 4
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#if defined(__AVR_AT90USB162__)
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#define CDC_ACM_SIZE 16
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#define CDC_ACM_BUFFER EP_SINGLE_BUFFER
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#define CDC_RX_SIZE 32
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#define CDC_RX_BUFFER EP_DOUBLE_BUFFER
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#define CDC_TX_SIZE 32
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#define CDC_TX_BUFFER EP_DOUBLE_BUFFER
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#else
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#define CDC_ACM_SIZE 16
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#define CDC_ACM_BUFFER EP_SINGLE_BUFFER
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#define CDC_RX_SIZE 64
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#define CDC_RX_BUFFER EP_DOUBLE_BUFFER
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#define CDC_TX_SIZE 64
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#define CDC_TX_BUFFER EP_DOUBLE_BUFFER
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#endif
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static const uint8_t PROGMEM endpoint_config_table[] = {
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0,
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1, EP_TYPE_INTERRUPT_IN, EP_SIZE(CDC_ACM_SIZE) | CDC_ACM_BUFFER,
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1, EP_TYPE_BULK_OUT, EP_SIZE(CDC_RX_SIZE) | CDC_RX_BUFFER,
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1, EP_TYPE_BULK_IN, EP_SIZE(CDC_TX_SIZE) | CDC_TX_BUFFER
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};
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/**************************************************************************
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*
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* Descriptor Data
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*
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**************************************************************************/
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// Descriptors are the data that your computer reads when it auto-detects
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// this USB device (called "enumeration" in USB lingo). The most commonly
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// changed items are editable at the top of this file. Changing things
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// in here should only be done by those who've read chapter 9 of the USB
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// spec and relevant portions of any USB class specifications!
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static const uint8_t PROGMEM device_descriptor[] = {
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18, // bLength
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1, // bDescriptorType
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0x00, 0x02, // bcdUSB
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2, // bDeviceClass
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0, // bDeviceSubClass
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0, // bDeviceProtocol
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ENDPOINT0_SIZE, // bMaxPacketSize0
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LSB(VENDOR_ID), MSB(VENDOR_ID), // idVendor
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LSB(PRODUCT_ID), MSB(PRODUCT_ID), // idProduct
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0x00, 0x01, // bcdDevice
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1, // iManufacturer
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2, // iProduct
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3, // iSerialNumber
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1 // bNumConfigurations
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};
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#define CONFIG1_DESC_SIZE (9+9+5+5+4+5+7+9+7+7)
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static const uint8_t PROGMEM config1_descriptor[CONFIG1_DESC_SIZE] = {
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// configuration descriptor, USB spec 9.6.3, page 264-266, Table 9-10
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9, // bLength;
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2, // bDescriptorType;
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LSB(CONFIG1_DESC_SIZE), // wTotalLength
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MSB(CONFIG1_DESC_SIZE),
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2, // bNumInterfaces
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1, // bConfigurationValue
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0, // iConfiguration
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0xC0, // bmAttributes
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50, // bMaxPower
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// interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
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9, // bLength
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4, // bDescriptorType
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0, // bInterfaceNumber
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0, // bAlternateSetting
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1, // bNumEndpoints
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0x02, // bInterfaceClass
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0x02, // bInterfaceSubClass
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0x01, // bInterfaceProtocol
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0, // iInterface
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// CDC Header Functional Descriptor, CDC Spec 5.2.3.1, Table 26
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5, // bFunctionLength
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0x24, // bDescriptorType
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0x00, // bDescriptorSubtype
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0x10, 0x01, // bcdCDC
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// Call Management Functional Descriptor, CDC Spec 5.2.3.2, Table 27
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5, // bFunctionLength
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0x24, // bDescriptorType
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0x01, // bDescriptorSubtype
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0x01, // bmCapabilities
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1, // bDataInterface
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// Abstract Control Management Functional Descriptor, CDC Spec 5.2.3.3, Table 28
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4, // bFunctionLength
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0x24, // bDescriptorType
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0x02, // bDescriptorSubtype
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0x06, // bmCapabilities
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// Union Functional Descriptor, CDC Spec 5.2.3.8, Table 33
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5, // bFunctionLength
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0x24, // bDescriptorType
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0x06, // bDescriptorSubtype
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0, // bMasterInterface
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1, // bSlaveInterface0
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// endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
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7, // bLength
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5, // bDescriptorType
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CDC_ACM_ENDPOINT | 0x80, // bEndpointAddress
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0x03, // bmAttributes (0x03=intr)
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CDC_ACM_SIZE, 0, // wMaxPacketSize
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64, // bInterval
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// interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
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9, // bLength
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4, // bDescriptorType
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1, // bInterfaceNumber
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0, // bAlternateSetting
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2, // bNumEndpoints
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0x0A, // bInterfaceClass
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0x00, // bInterfaceSubClass
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0x00, // bInterfaceProtocol
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0, // iInterface
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// endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
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7, // bLength
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5, // bDescriptorType
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CDC_RX_ENDPOINT, // bEndpointAddress
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0x02, // bmAttributes (0x02=bulk)
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CDC_RX_SIZE, 0, // wMaxPacketSize
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0, // bInterval
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// endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
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7, // bLength
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5, // bDescriptorType
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CDC_TX_ENDPOINT | 0x80, // bEndpointAddress
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0x02, // bmAttributes (0x02=bulk)
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CDC_TX_SIZE, 0, // wMaxPacketSize
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0 // bInterval
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};
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// If you're desperate for a little extra code memory, these strings
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// can be completely removed if iManufacturer, iProduct, iSerialNumber
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// in the device desciptor are changed to zeros.
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struct usb_string_descriptor_struct {
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uint8_t bLength;
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uint8_t bDescriptorType;
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int16_t wString[];
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};
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static const struct usb_string_descriptor_struct PROGMEM string0 = {
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4,
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3,
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{0x0409}
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};
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static const struct usb_string_descriptor_struct PROGMEM string1 = {
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sizeof(STR_MANUFACTURER),
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3,
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STR_MANUFACTURER
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};
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static const struct usb_string_descriptor_struct PROGMEM string2 = {
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sizeof(STR_PRODUCT),
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3,
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STR_PRODUCT
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};
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static const struct usb_string_descriptor_struct PROGMEM string3 = {
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sizeof(STR_SERIAL_NUMBER),
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3,
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STR_SERIAL_NUMBER
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};
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// This table defines which descriptor data is sent for each specific
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// request from the host (in wValue and wIndex).
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static const struct descriptor_list_struct {
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uint16_t wValue;
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uint16_t wIndex;
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const uint8_t *addr;
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uint8_t length;
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} PROGMEM descriptor_list[] = {
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{0x0100, 0x0000, device_descriptor, sizeof(device_descriptor)},
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{0x0200, 0x0000, config1_descriptor, sizeof(config1_descriptor)},
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{0x0300, 0x0000, (const uint8_t *)&string0, 4},
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{0x0301, 0x0409, (const uint8_t *)&string1, sizeof(STR_MANUFACTURER)},
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{0x0302, 0x0409, (const uint8_t *)&string2, sizeof(STR_PRODUCT)},
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{0x0303, 0x0409, (const uint8_t *)&string3, sizeof(STR_SERIAL_NUMBER)}
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};
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#define NUM_DESC_LIST (sizeof(descriptor_list)/sizeof(struct descriptor_list_struct))
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/**************************************************************************
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*
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* Variables - these are the only non-stack RAM usage
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*
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**************************************************************************/
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// zero when we are not configured, non-zero when enumerated
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static volatile uint8_t usb_configuration=0;
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// the time remaining before we transmit any partially full
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// packet, or send a zero length packet.
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static volatile uint8_t transmit_flush_timer=0;
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static uint8_t transmit_previous_timeout=0;
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// serial port settings (baud rate, control signals, etc) set
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// by the PC. These are ignored, but kept in RAM.
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static uint8_t cdc_line_coding[7]={0x00, 0xE1, 0x00, 0x00, 0x00, 0x00, 0x08};
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static uint8_t cdc_line_rtsdtr=0;
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/**************************************************************************
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*
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* Public Functions - these are the API intended for the user
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*
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**************************************************************************/
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// initialize USB serial
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void usb_init(void)
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{
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HW_CONFIG();
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USB_FREEZE(); // enable USB
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PLL_CONFIG(); // config PLL, 16 MHz xtal
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while (!(PLLCSR & (1<<PLOCK))) ; // wait for PLL lock
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USB_CONFIG(); // start USB clock
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UDCON = 0; // enable attach resistor
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usb_configuration = 0;
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cdc_line_rtsdtr = 0;
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UDIEN = (1<<EORSTE);
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sei();
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}
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// return 0 if the USB is not configured, or the configuration
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// number selected by the HOST
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uint8_t usb_configured(void)
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{
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return usb_configuration;
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}
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// get the next character, or -1 if nothing received
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int16_t usb_serial_getchar(void)
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{
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uint8_t c, intr_state;
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// interrupts are disabled so these functions can be
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// used from the main program or interrupt context,
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// even both in the same program!
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intr_state = SREG;
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cli();
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if (!usb_configuration) {
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SREG = intr_state;
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return -1;
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}
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UENUM = CDC_RX_ENDPOINT;
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retry:
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c = UEINTX;
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if (!(c & (1<<RWAL))) {
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// no data in buffer
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if (c & (1<<RXOUTI)) {
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UEINTX = 0x6B;
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goto retry;
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}
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UEIENX = (1<<RXOUTE);
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SREG = intr_state;
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return -1;
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}
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// take one byte out of the buffer
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c = UEDATX;
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// if buffer completely used, release it
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if (!(UEINTX & (1<<RWAL))) UEINTX = 0x6B;
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SREG = intr_state;
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return c;
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}
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// number of bytes available in the receive buffer
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uint8_t usb_serial_available(void)
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{
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uint8_t n=0, i, intr_state;
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intr_state = SREG;
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cli();
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if (usb_configuration) {
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UENUM = CDC_RX_ENDPOINT;
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n = UEBCLX;
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if (!n) {
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i = UEINTX;
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if (i & (1<<RXOUTI) && !(i & (1<<RWAL))) UEINTX = 0x6B;
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}
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}
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SREG = intr_state;
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return n;
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}
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// discard any buffered input
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void usb_serial_flush_input(void)
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{
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uint8_t intr_state;
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if (usb_configuration) {
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intr_state = SREG;
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cli();
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UENUM = CDC_RX_ENDPOINT;
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while ((UEINTX & (1<<RWAL))) {
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UEINTX = 0x6B;
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}
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SREG = intr_state;
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}
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}
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// transmit a character. 0 returned on success, -1 on error
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int8_t usb_serial_putchar(uint8_t c)
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{
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uint8_t timeout, intr_state;
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// if we're not online (enumerated and configured), error
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if (!usb_configuration) return -1;
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// interrupts are disabled so these functions can be
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// used from the main program or interrupt context,
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// even both in the same program!
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intr_state = SREG;
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cli();
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UENUM = CDC_TX_ENDPOINT;
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// if we gave up due to timeout before, don't wait again
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if (transmit_previous_timeout) {
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if (!(UEINTX & (1<<RWAL))) {
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SREG = intr_state;
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return -1;
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}
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transmit_previous_timeout = 0;
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}
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// wait for the FIFO to be ready to accept data
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timeout = UDFNUML + TRANSMIT_TIMEOUT;
|
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while (1) {
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// are we ready to transmit?
|
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if (UEINTX & (1<<RWAL)) break;
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SREG = intr_state;
|
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// have we waited too long? This happens if the user
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// is not running an application that is listening
|
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if (UDFNUML == timeout) {
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transmit_previous_timeout = 1;
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return -1;
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}
|
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// has the USB gone offline?
|
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if (!usb_configuration) return -1;
|
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// get ready to try checking again
|
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intr_state = SREG;
|
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cli();
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UENUM = CDC_TX_ENDPOINT;
|
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}
|
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// actually write the byte into the FIFO
|
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UEDATX = c;
|
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// if this completed a packet, transmit it now!
|
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if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
|
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transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
|
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SREG = intr_state;
|
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return 0;
|
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}
|
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|
|
|
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// transmit a character, but do not wait if the buffer is full,
|
|
// 0 returned on success, -1 on buffer full or error
|
|
int8_t usb_serial_putchar_nowait(uint8_t c)
|
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{
|
|
uint8_t intr_state;
|
|
|
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if (!usb_configuration) return -1;
|
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intr_state = SREG;
|
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cli();
|
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UENUM = CDC_TX_ENDPOINT;
|
|
if (!(UEINTX & (1<<RWAL))) {
|
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// buffer is full
|
|
SREG = intr_state;
|
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return -1;
|
|
}
|
|
// actually write the byte into the FIFO
|
|
UEDATX = c;
|
|
// if this completed a packet, transmit it now!
|
|
if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
|
|
transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
|
|
SREG = intr_state;
|
|
return 0;
|
|
}
|
|
|
|
// transmit a buffer.
|
|
// 0 returned on success, -1 on error
|
|
// This function is optimized for speed! Each call takes approx 6.1 us overhead
|
|
// plus 0.25 us per byte. 12 Mbit/sec USB has 8.67 us per-packet overhead and
|
|
// takes 0.67 us per byte. If called with 64 byte packet-size blocks, this function
|
|
// can transmit at full USB speed using 43% CPU time. The maximum theoretical speed
|
|
// is 19 packets per USB frame, or 1216 kbytes/sec. However, bulk endpoints have the
|
|
// lowest priority, so any other USB devices will likely reduce the speed. Speed
|
|
// can also be limited by how quickly the PC-based software reads data, as the host
|
|
// controller in the PC will not allocate bandwitdh without a pending read request.
|
|
// (thanks to Victor Suarez for testing and feedback and initial code)
|
|
|
|
int8_t usb_serial_write(const uint8_t *buffer, uint16_t size)
|
|
{
|
|
uint8_t timeout, intr_state, write_size;
|
|
|
|
// if we're not online (enumerated and configured), error
|
|
if (!usb_configuration) return -1;
|
|
// interrupts are disabled so these functions can be
|
|
// used from the main program or interrupt context,
|
|
// even both in the same program!
|
|
intr_state = SREG;
|
|
cli();
|
|
UENUM = CDC_TX_ENDPOINT;
|
|
// if we gave up due to timeout before, don't wait again
|
|
if (transmit_previous_timeout) {
|
|
if (!(UEINTX & (1<<RWAL))) {
|
|
SREG = intr_state;
|
|
return -1;
|
|
}
|
|
transmit_previous_timeout = 0;
|
|
}
|
|
// each iteration of this loop transmits a packet
|
|
while (size) {
|
|
// wait for the FIFO to be ready to accept data
|
|
timeout = UDFNUML + TRANSMIT_TIMEOUT;
|
|
while (1) {
|
|
// are we ready to transmit?
|
|
if (UEINTX & (1<<RWAL)) break;
|
|
SREG = intr_state;
|
|
// have we waited too long? This happens if the user
|
|
// is not running an application that is listening
|
|
if (UDFNUML == timeout) {
|
|
transmit_previous_timeout = 1;
|
|
return -1;
|
|
}
|
|
// has the USB gone offline?
|
|
if (!usb_configuration) return -1;
|
|
// get ready to try checking again
|
|
intr_state = SREG;
|
|
cli();
|
|
UENUM = CDC_TX_ENDPOINT;
|
|
}
|
|
|
|
// compute how many bytes will fit into the next packet
|
|
write_size = CDC_TX_SIZE - UEBCLX;
|
|
if (write_size > size) write_size = size;
|
|
size -= write_size;
|
|
|
|
// write the packet
|
|
switch (write_size) {
|
|
#if (CDC_TX_SIZE == 64)
|
|
case 64: UEDATX = *buffer++;
|
|
case 63: UEDATX = *buffer++;
|
|
case 62: UEDATX = *buffer++;
|
|
case 61: UEDATX = *buffer++;
|
|
case 60: UEDATX = *buffer++;
|
|
case 59: UEDATX = *buffer++;
|
|
case 58: UEDATX = *buffer++;
|
|
case 57: UEDATX = *buffer++;
|
|
case 56: UEDATX = *buffer++;
|
|
case 55: UEDATX = *buffer++;
|
|
case 54: UEDATX = *buffer++;
|
|
case 53: UEDATX = *buffer++;
|
|
case 52: UEDATX = *buffer++;
|
|
case 51: UEDATX = *buffer++;
|
|
case 50: UEDATX = *buffer++;
|
|
case 49: UEDATX = *buffer++;
|
|
case 48: UEDATX = *buffer++;
|
|
case 47: UEDATX = *buffer++;
|
|
case 46: UEDATX = *buffer++;
|
|
case 45: UEDATX = *buffer++;
|
|
case 44: UEDATX = *buffer++;
|
|
case 43: UEDATX = *buffer++;
|
|
case 42: UEDATX = *buffer++;
|
|
case 41: UEDATX = *buffer++;
|
|
case 40: UEDATX = *buffer++;
|
|
case 39: UEDATX = *buffer++;
|
|
case 38: UEDATX = *buffer++;
|
|
case 37: UEDATX = *buffer++;
|
|
case 36: UEDATX = *buffer++;
|
|
case 35: UEDATX = *buffer++;
|
|
case 34: UEDATX = *buffer++;
|
|
case 33: UEDATX = *buffer++;
|
|
#endif
|
|
#if (CDC_TX_SIZE >= 32)
|
|
case 32: UEDATX = *buffer++;
|
|
case 31: UEDATX = *buffer++;
|
|
case 30: UEDATX = *buffer++;
|
|
case 29: UEDATX = *buffer++;
|
|
case 28: UEDATX = *buffer++;
|
|
case 27: UEDATX = *buffer++;
|
|
case 26: UEDATX = *buffer++;
|
|
case 25: UEDATX = *buffer++;
|
|
case 24: UEDATX = *buffer++;
|
|
case 23: UEDATX = *buffer++;
|
|
case 22: UEDATX = *buffer++;
|
|
case 21: UEDATX = *buffer++;
|
|
case 20: UEDATX = *buffer++;
|
|
case 19: UEDATX = *buffer++;
|
|
case 18: UEDATX = *buffer++;
|
|
case 17: UEDATX = *buffer++;
|
|
#endif
|
|
#if (CDC_TX_SIZE >= 16)
|
|
case 16: UEDATX = *buffer++;
|
|
case 15: UEDATX = *buffer++;
|
|
case 14: UEDATX = *buffer++;
|
|
case 13: UEDATX = *buffer++;
|
|
case 12: UEDATX = *buffer++;
|
|
case 11: UEDATX = *buffer++;
|
|
case 10: UEDATX = *buffer++;
|
|
case 9: UEDATX = *buffer++;
|
|
#endif
|
|
case 8: UEDATX = *buffer++;
|
|
case 7: UEDATX = *buffer++;
|
|
case 6: UEDATX = *buffer++;
|
|
case 5: UEDATX = *buffer++;
|
|
case 4: UEDATX = *buffer++;
|
|
case 3: UEDATX = *buffer++;
|
|
case 2: UEDATX = *buffer++;
|
|
default:
|
|
case 1: UEDATX = *buffer++;
|
|
case 0: break;
|
|
}
|
|
// if this completed a packet, transmit it now!
|
|
if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
|
|
transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
|
|
SREG = intr_state;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
// immediately transmit any buffered output.
|
|
// This doesn't actually transmit the data - that is impossible!
|
|
// USB devices only transmit when the host allows, so the best
|
|
// we can do is release the FIFO buffer for when the host wants it
|
|
void usb_serial_flush_output(void)
|
|
{
|
|
uint8_t intr_state;
|
|
|
|
intr_state = SREG;
|
|
cli();
|
|
if (transmit_flush_timer) {
|
|
UENUM = CDC_TX_ENDPOINT;
|
|
UEINTX = 0x3A;
|
|
transmit_flush_timer = 0;
|
|
}
|
|
SREG = intr_state;
|
|
}
|
|
|
|
// functions to read the various async serial settings. These
|
|
// aren't actually used by USB at all (communication is always
|
|
// at full USB speed), but they are set by the host so we can
|
|
// set them properly if we're converting the USB to a real serial
|
|
// communication
|
|
uint32_t usb_serial_get_baud(void)
|
|
{
|
|
uint32_t res;
|
|
memcpy(&res, cdc_line_coding, sizeof(res));
|
|
return res;
|
|
}
|
|
uint8_t usb_serial_get_stopbits(void)
|
|
{
|
|
return cdc_line_coding[4];
|
|
}
|
|
uint8_t usb_serial_get_paritytype(void)
|
|
{
|
|
return cdc_line_coding[5];
|
|
}
|
|
uint8_t usb_serial_get_numbits(void)
|
|
{
|
|
return cdc_line_coding[6];
|
|
}
|
|
uint8_t usb_serial_get_control(void)
|
|
{
|
|
return cdc_line_rtsdtr;
|
|
}
|
|
// write the control signals, DCD, DSR, RI, etc
|
|
// There is no CTS signal. If software on the host has transmitted
|
|
// data to you but you haven't been calling the getchar function,
|
|
// it remains buffered (either here or on the host) and can not be
|
|
// lost because you weren't listening at the right time, like it
|
|
// would in real serial communication.
|
|
int8_t usb_serial_set_control(uint8_t signals)
|
|
{
|
|
uint8_t intr_state;
|
|
|
|
intr_state = SREG;
|
|
cli();
|
|
if (!usb_configuration) {
|
|
// we're not enumerated/configured
|
|
SREG = intr_state;
|
|
return -1;
|
|
}
|
|
|
|
UENUM = CDC_ACM_ENDPOINT;
|
|
if (!(UEINTX & (1<<RWAL))) {
|
|
// unable to write
|
|
// TODO; should this try to abort the previously
|
|
// buffered message??
|
|
SREG = intr_state;
|
|
return -1;
|
|
}
|
|
UEDATX = 0xA1;
|
|
UEDATX = 0x20;
|
|
UEDATX = 0;
|
|
UEDATX = 0;
|
|
UEDATX = 0; // 0 seems to work nicely. what if this is 1??
|
|
UEDATX = 0;
|
|
UEDATX = 1;
|
|
UEDATX = 0;
|
|
UEDATX = signals;
|
|
UEINTX = 0x3A;
|
|
SREG = intr_state;
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* Private Functions - not intended for general user consumption....
|
|
*
|
|
**************************************************************************/
|
|
|
|
|
|
// USB Device Interrupt - handle all device-level events
|
|
// the transmit buffer flushing is triggered by the start of frame
|
|
//
|
|
ISR(USB_GEN_vect)
|
|
{
|
|
uint8_t intbits, t;
|
|
|
|
intbits = UDINT;
|
|
UDINT = 0;
|
|
if (intbits & (1<<EORSTI)) {
|
|
UENUM = 0;
|
|
UECONX = 1;
|
|
UECFG0X = EP_TYPE_CONTROL;
|
|
UECFG1X = EP_SIZE(ENDPOINT0_SIZE) | EP_SINGLE_BUFFER;
|
|
UEIENX = (1<<RXSTPE);
|
|
usb_configuration = 0;
|
|
cdc_line_rtsdtr = 0;
|
|
}
|
|
if (intbits & (1<<SOFI)) {
|
|
if (usb_configuration) {
|
|
t = transmit_flush_timer;
|
|
if (t) {
|
|
transmit_flush_timer = --t;
|
|
if (!t) {
|
|
UENUM = CDC_TX_ENDPOINT;
|
|
UEINTX = 0x3A;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// Misc functions to wait for ready and send/receive packets
|
|
static inline void usb_wait_in_ready(void)
|
|
{
|
|
while (!(UEINTX & (1<<TXINI))) ;
|
|
}
|
|
static inline void usb_send_in(void)
|
|
{
|
|
UEINTX = ~(1<<TXINI);
|
|
}
|
|
static inline void usb_wait_receive_out(void)
|
|
{
|
|
while (!(UEINTX & (1<<RXOUTI))) ;
|
|
}
|
|
static inline void usb_ack_out(void)
|
|
{
|
|
UEINTX = ~(1<<RXOUTI);
|
|
}
|
|
|
|
|
|
|
|
// USB Endpoint Interrupt - endpoint 0 is handled here. The
|
|
// other endpoints are manipulated by the user-callable
|
|
// functions, and the start-of-frame interrupt.
|
|
//
|
|
ISR(USB_COM_vect)
|
|
{
|
|
uint8_t intbits = UEINT;
|
|
if (intbits & (1<<CDC_RX_ENDPOINT)) {
|
|
UENUM = CDC_RX_ENDPOINT;
|
|
UEIENX = 0;
|
|
extern void sched_wake_tasks(void);
|
|
sched_wake_tasks();
|
|
return;
|
|
}
|
|
const uint8_t *list;
|
|
const uint8_t *cfg;
|
|
uint8_t i, n, len, en;
|
|
uint8_t *p;
|
|
uint8_t bmRequestType;
|
|
uint8_t bRequest;
|
|
uint16_t wValue;
|
|
uint16_t wIndex;
|
|
uint16_t wLength;
|
|
uint16_t desc_val;
|
|
const uint8_t *desc_addr;
|
|
uint8_t desc_length;
|
|
|
|
UENUM = 0;
|
|
intbits = UEINTX;
|
|
if (intbits & (1<<RXSTPI)) {
|
|
bmRequestType = UEDATX;
|
|
bRequest = UEDATX;
|
|
wValue = UEDATX;
|
|
wValue |= (UEDATX << 8);
|
|
wIndex = UEDATX;
|
|
wIndex |= (UEDATX << 8);
|
|
wLength = UEDATX;
|
|
wLength |= (UEDATX << 8);
|
|
UEINTX = ~((1<<RXSTPI) | (1<<RXOUTI) | (1<<TXINI));
|
|
if (bRequest == GET_DESCRIPTOR) {
|
|
list = (const uint8_t *)descriptor_list;
|
|
for (i=0; ; i++) {
|
|
if (i >= NUM_DESC_LIST) {
|
|
UECONX = (1<<STALLRQ)|(1<<EPEN); //stall
|
|
return;
|
|
}
|
|
desc_val = pgm_read_word(list);
|
|
if (desc_val != wValue) {
|
|
list += sizeof(struct descriptor_list_struct);
|
|
continue;
|
|
}
|
|
list += 2;
|
|
desc_val = pgm_read_word(list);
|
|
if (desc_val != wIndex) {
|
|
list += sizeof(struct descriptor_list_struct)-2;
|
|
continue;
|
|
}
|
|
list += 2;
|
|
desc_addr = (const uint8_t *)pgm_read_word(list);
|
|
list += 2;
|
|
desc_length = pgm_read_byte(list);
|
|
break;
|
|
}
|
|
len = (wLength < 256) ? wLength : 255;
|
|
if (len > desc_length) len = desc_length;
|
|
do {
|
|
// wait for host ready for IN packet
|
|
do {
|
|
i = UEINTX;
|
|
} while (!(i & ((1<<TXINI)|(1<<RXOUTI))));
|
|
if (i & (1<<RXOUTI)) return; // abort
|
|
// send IN packet
|
|
n = len < ENDPOINT0_SIZE ? len : ENDPOINT0_SIZE;
|
|
for (i = n; i; i--) {
|
|
UEDATX = pgm_read_byte(desc_addr++);
|
|
}
|
|
len -= n;
|
|
usb_send_in();
|
|
} while (len || n == ENDPOINT0_SIZE);
|
|
return;
|
|
}
|
|
if (bRequest == SET_ADDRESS) {
|
|
usb_send_in();
|
|
usb_wait_in_ready();
|
|
UDADDR = wValue | (1<<ADDEN);
|
|
return;
|
|
}
|
|
if (bRequest == SET_CONFIGURATION && bmRequestType == 0) {
|
|
usb_configuration = wValue;
|
|
cdc_line_rtsdtr = 0;
|
|
transmit_flush_timer = 0;
|
|
usb_send_in();
|
|
cfg = endpoint_config_table;
|
|
for (i=1; i<5; i++) {
|
|
UENUM = i;
|
|
en = pgm_read_byte(cfg++);
|
|
UECONX = en;
|
|
if (en) {
|
|
UECFG0X = pgm_read_byte(cfg++);
|
|
UECFG1X = pgm_read_byte(cfg++);
|
|
}
|
|
}
|
|
UERST = 0x1E;
|
|
UERST = 0;
|
|
return;
|
|
}
|
|
if (bRequest == GET_CONFIGURATION && bmRequestType == 0x80) {
|
|
usb_wait_in_ready();
|
|
UEDATX = usb_configuration;
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
if (bRequest == CDC_GET_LINE_CODING && bmRequestType == 0xA1) {
|
|
usb_wait_in_ready();
|
|
p = cdc_line_coding;
|
|
for (i=0; i<7; i++) {
|
|
UEDATX = *p++;
|
|
}
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
if (bRequest == CDC_SET_LINE_CODING && bmRequestType == 0x21) {
|
|
usb_wait_receive_out();
|
|
p = cdc_line_coding;
|
|
for (i=0; i<7; i++) {
|
|
*p++ = UEDATX;
|
|
}
|
|
usb_ack_out();
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
if (bRequest == CDC_SET_CONTROL_LINE_STATE && bmRequestType == 0x21) {
|
|
cdc_line_rtsdtr = wValue;
|
|
usb_wait_in_ready();
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
if (bRequest == GET_STATUS) {
|
|
usb_wait_in_ready();
|
|
i = 0;
|
|
#ifdef SUPPORT_ENDPOINT_HALT
|
|
if (bmRequestType == 0x82) {
|
|
UENUM = wIndex;
|
|
if (UECONX & (1<<STALLRQ)) i = 1;
|
|
UENUM = 0;
|
|
}
|
|
#endif
|
|
UEDATX = i;
|
|
UEDATX = 0;
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
#ifdef SUPPORT_ENDPOINT_HALT
|
|
if ((bRequest == CLEAR_FEATURE || bRequest == SET_FEATURE)
|
|
&& bmRequestType == 0x02 && wValue == 0) {
|
|
i = wIndex & 0x7F;
|
|
if (i >= 1 && i <= MAX_ENDPOINT) {
|
|
usb_send_in();
|
|
UENUM = i;
|
|
if (bRequest == SET_FEATURE) {
|
|
UECONX = (1<<STALLRQ)|(1<<EPEN);
|
|
} else {
|
|
UECONX = (1<<STALLRQC)|(1<<RSTDT)|(1<<EPEN);
|
|
UERST = (1 << i);
|
|
UERST = 0;
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
UECONX = (1<<STALLRQ) | (1<<EPEN); // stall
|
|
}
|
|
|
|
|