140 lines
6.0 KiB
Python
140 lines
6.0 KiB
Python
# Helper code for SPI and I2C bus communication
|
|
#
|
|
# Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
|
|
#
|
|
# This file may be distributed under the terms of the GNU GPLv3 license.
|
|
import mcu
|
|
|
|
|
|
######################################################################
|
|
# SPI
|
|
######################################################################
|
|
|
|
# Helper code for working with devices connected to an MCU via an SPI bus
|
|
class MCU_SPI:
|
|
def __init__(self, mcu, bus, pin, mode, speed, shutdown_seq):
|
|
self.mcu = mcu
|
|
shutdown_msg = "".join(["%02x" % (x,) for x in shutdown_seq])
|
|
self.oid = self.mcu.create_oid()
|
|
if pin is None:
|
|
self.mcu.add_config_cmd(
|
|
"config_spi_without_cs oid=%d bus=%d mode=%d rate=%d"
|
|
" shutdown_msg=%s" % (
|
|
self.oid, bus, mode, speed, shutdown_msg))
|
|
else:
|
|
self.mcu.add_config_cmd(
|
|
"config_spi oid=%d bus=%d pin=%s mode=%d rate=%d"
|
|
" shutdown_msg=%s" % (
|
|
self.oid, bus, pin, mode, speed, shutdown_msg))
|
|
self.cmd_queue = self.mcu.alloc_command_queue()
|
|
self.mcu.register_config_callback(self.build_config)
|
|
self.spi_send_cmd = self.spi_transfer_cmd = None
|
|
def get_oid(self):
|
|
return self.oid
|
|
def get_mcu(self):
|
|
return self.mcu
|
|
def get_command_queue(self):
|
|
return self.cmd_queue
|
|
def build_config(self):
|
|
self.spi_send_cmd = self.mcu.lookup_command(
|
|
"spi_send oid=%c data=%*s", cq=self.cmd_queue)
|
|
self.spi_transfer_cmd = self.mcu.lookup_command(
|
|
"spi_transfer oid=%c data=%*s", cq=self.cmd_queue)
|
|
def spi_send(self, data, minclock=0, reqclock=0):
|
|
if self.spi_send_cmd is None:
|
|
# Send setup message via mcu initialization
|
|
data_msg = "".join(["%02x" % (x,) for x in data])
|
|
self.mcu.add_config_cmd("spi_send oid=%d data=%s" % (
|
|
self.oid, data_msg), is_init=True)
|
|
return
|
|
self.spi_send_cmd.send([self.oid, data],
|
|
minclock=minclock, reqclock=reqclock)
|
|
def spi_transfer(self, data):
|
|
return self.spi_transfer_cmd.send_with_response(
|
|
[self.oid, data], 'spi_transfer_response', self.oid)
|
|
|
|
# Helper to setup an spi bus from settings in a config section
|
|
def MCU_SPI_from_config(config, mode, pin_option="cs_pin",
|
|
default_speed=100000, shutdown_seq=()):
|
|
# Determine pin from config
|
|
ppins = config.get_printer().lookup_object("pins")
|
|
cs_pin = config.get(pin_option)
|
|
cs_pin_params = ppins.lookup_pin(cs_pin)
|
|
pin = cs_pin_params['pin']
|
|
if pin == 'None':
|
|
pin = None
|
|
# Load bus parameters
|
|
speed = config.getint('spi_speed', default_speed, minval=100000)
|
|
bus = config.getint('spi_bus', 0, minval=0)
|
|
# Create MCU_SPI object
|
|
mcu = cs_pin_params['chip']
|
|
return MCU_SPI(mcu, bus, pin, mode, speed, shutdown_seq)
|
|
|
|
|
|
######################################################################
|
|
# I2C
|
|
######################################################################
|
|
|
|
# Helper code for working with devices connected to an MCU via an I2C bus
|
|
class MCU_I2C:
|
|
def __init__(self, mcu, bus, addr, speed):
|
|
self.mcu = mcu
|
|
self.oid = self.mcu.create_oid()
|
|
self.mcu.add_config_cmd("config_i2c oid=%d bus=%d rate=%d addr=%d" % (
|
|
self.oid, bus, speed, addr))
|
|
self.cmd_queue = self.mcu.alloc_command_queue()
|
|
self.mcu.register_config_callback(self.build_config)
|
|
self.i2c_write_cmd = self.i2c_read_cmd = self.i2c_modify_bits_cmd = None
|
|
def get_oid(self):
|
|
return self.oid
|
|
def get_mcu(self):
|
|
return self.mcu
|
|
def get_command_queue(self):
|
|
return self.cmd_queue
|
|
def build_config(self):
|
|
self.i2c_write_cmd = self.mcu.lookup_command(
|
|
"i2c_write oid=%c data=%*s", cq=self.cmd_queue)
|
|
self.i2c_read_cmd = self.mcu.lookup_command(
|
|
"i2c_read oid=%c reg=%*s read_len=%u", cq=self.cmd_queue)
|
|
self.i2c_modify_bits_cmd = self.mcu.lookup_command(
|
|
"i2c_modify_bits oid=%c reg=%*s clear_set_bits=%*s",
|
|
cq=self.cmd_queue)
|
|
def i2c_write(self, data, minclock=0, reqclock=0):
|
|
if self.i2c_write_cmd is None:
|
|
# Send setup message via mcu initialization
|
|
data_msg = "".join(["%02x" % (x,) for x in data])
|
|
self.mcu.add_config_cmd("i2c_write oid=%d data=%s" % (
|
|
self.oid, data_msg), is_init=True)
|
|
return
|
|
self.i2c_write_cmd.send([self.oid, data],
|
|
minclock=minclock, reqclock=reqclock)
|
|
def i2c_read(self, write, read_len):
|
|
return self.i2c_read_cmd.send_with_response(
|
|
[self.oid, write, read_len], 'i2c_read_response', self.oid)
|
|
def i2c_modify_bits(self, reg, clear_bits, set_bits,
|
|
minclock=0, reqclock=0):
|
|
clearset = clear_bits + set_bits
|
|
if self.i2c_modify_bits_cmd is None:
|
|
# Send setup message via mcu initialization
|
|
reg_msg = "".join(["%02x" % (x,) for x in reg])
|
|
clearset_msg = "".join(["%02x" % (x,) for x in clearset])
|
|
self.mcu.add_config_cmd(
|
|
"i2c_modify_bits oid=%d reg=%s clear_set_bits=%s" % (
|
|
self.oid, reg_msg, clearset_msg), is_init=True)
|
|
return
|
|
self.i2c_modify_bits_cmd.send([self.oid, reg, clearset],
|
|
minclock=minclock, reqclock=reqclock)
|
|
|
|
def MCU_I2C_from_config(config, default_addr=None, default_speed=100000):
|
|
# Load bus parameters
|
|
printer = config.get_printer()
|
|
i2c_mcu = mcu.get_printer_mcu(printer, config.get('i2c_mcu', 'mcu'))
|
|
speed = config.getint('i2c_speed', default_speed, minval=100000)
|
|
bus = config.getint('i2c_bus', 0, minval=0)
|
|
if default_addr is None:
|
|
addr = config.getint('i2c_address')
|
|
else:
|
|
addr = config.getint('i2c_address', default_addr)
|
|
# Create MCU_I2C object
|
|
return MCU_I2C(i2c_mcu, bus, addr, speed)
|