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lpc176x: Explicitly disconnect USB on a bootloader request 

It appears some host machines may not recognize that the USB device
has disconnected upon start of bootloader mode.  Explicitly disable
USB and add a 5ms delay to help signal the host of the upcoming
change.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-03-31 13:34:23 -04:00
parent 60ff2e9dc1
commit fbbe2cf9d6
1 changed files with 7 additions and 1 deletions
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8
src/lpc176x/usbserial.c
View File

@ -8,6 +8,7 @@
#include "LPC17xx.h" // LPC_SC
#include "autoconf.h" // CONFIG_SMOOTHIEWARE_BOOTLOADER
#include "board/irq.h" // irq_disable
#include "board/misc.h" // timer_read_time
#include "byteorder.h" // cpu_to_le32
#include "command.h" // output
#include "generic/usb_cdc.h" // usb_notify_ep0
@ -248,9 +249,14 @@ usb_request_bootloader(void)
{
if (!CONFIG_SMOOTHIEWARE_BOOTLOADER)
return;
// Disable USB and pause for 5ms so host recognizes a disconnect
irq_disable();
sie_cmd_write(SIE_CMD_SET_DEVICE_STATUS, 0);
uint32_t end = timer_read_time() + timer_from_us(5000);
while (timer_is_before(timer_read_time(), end))
;
// The "LPC17xx-DFU-Bootloader" will enter the bootloader if the
// watchdog timeout flag is set.
irq_disable();
LPC_WDT->WDMOD = 0x07;
NVIC_SystemReset();
}