241 lines
10 KiB
Python
241 lines
10 KiB
Python
# Helper code for SPI and I2C bus communication
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#
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# Copyright (C) 2018,2019 Kevin O'Connor <kevin@koconnor.net>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import mcu
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def resolve_bus_name(mcu, param, bus):
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# Find enumerations for the given bus
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enumerations = mcu.get_enumerations()
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enums = enumerations.get(param, enumerations.get('bus'))
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if enums is None:
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if bus is None:
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return 0
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return bus
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# Verify bus is a valid enumeration
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ppins = mcu.get_printer().lookup_object("pins")
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mcu_name = mcu.get_name()
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if bus is None:
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rev_enums = {v: k for k, v in enums.items()}
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if 0 not in rev_enums:
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raise ppins.error("Must specify %s on mcu '%s'" % (param, mcu_name))
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bus = rev_enums[0]
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if bus not in enums:
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raise ppins.error("Unknown %s '%s'" % (param, bus))
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# Check for reserved bus pins
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constants = mcu.get_constants()
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reserve_pins = constants.get('BUS_PINS_%s' % (bus,), None)
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if reserve_pins is not None:
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for pin in reserve_pins.split(','):
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ppins.reserve_pin(mcu_name, pin, bus)
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return bus
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######################################################################
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# SPI
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######################################################################
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# Helper code for working with devices connected to an MCU via an SPI bus
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class MCU_SPI:
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def __init__(self, mcu, bus, pin, mode, speed, sw_pins=None):
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self.mcu = mcu
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self.bus = bus
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# Config SPI object (set all CS pins high before spi_set_bus commands)
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self.oid = mcu.create_oid()
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if pin is None:
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mcu.add_config_cmd("config_spi_without_cs oid=%d" % (self.oid,))
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else:
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mcu.add_config_cmd("config_spi oid=%d pin=%s" % (self.oid, pin))
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# Generate SPI bus config message
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if sw_pins is not None:
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self.config_fmt = (
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"spi_set_software_bus oid=%d"
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" miso_pin=%s mosi_pin=%s sclk_pin=%s mode=%d rate=%d"
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% (self.oid, sw_pins[0], sw_pins[1], sw_pins[2], mode, speed))
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else:
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self.config_fmt = (
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"spi_set_bus oid=%d spi_bus=%%s mode=%d rate=%d"
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% (self.oid, mode, speed))
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self.cmd_queue = mcu.alloc_command_queue()
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mcu.register_config_callback(self.build_config)
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self.spi_send_cmd = self.spi_transfer_cmd = None
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def setup_shutdown_msg(self, shutdown_seq):
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shutdown_msg = "".join(["%02x" % (x,) for x in shutdown_seq])
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self.mcu.add_config_cmd(
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"config_spi_shutdown oid=%d spi_oid=%d shutdown_msg=%s"
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% (self.mcu.create_oid(), self.oid, shutdown_msg))
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def get_oid(self):
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return self.oid
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def get_mcu(self):
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return self.mcu
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def get_command_queue(self):
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return self.cmd_queue
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def build_config(self):
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if '%' in self.config_fmt:
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bus = resolve_bus_name(self.mcu, "spi_bus", self.bus)
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self.config_fmt = self.config_fmt % (bus,)
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self.mcu.add_config_cmd(self.config_fmt)
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self.spi_send_cmd = self.mcu.lookup_command(
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"spi_send oid=%c data=%*s", cq=self.cmd_queue)
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self.spi_transfer_cmd = self.mcu.lookup_command(
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"spi_transfer oid=%c data=%*s", cq=self.cmd_queue)
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def spi_send(self, data, minclock=0, reqclock=0):
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if self.spi_send_cmd is None:
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# Send setup message via mcu initialization
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data_msg = "".join(["%02x" % (x,) for x in data])
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self.mcu.add_config_cmd("spi_send oid=%d data=%s" % (
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self.oid, data_msg), is_init=True)
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return
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self.spi_send_cmd.send([self.oid, data],
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minclock=minclock, reqclock=reqclock)
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def spi_transfer(self, data):
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return self.spi_transfer_cmd.send_with_response(
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[self.oid, data], 'spi_transfer_response', self.oid)
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# Helper to setup an spi bus from settings in a config section
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def MCU_SPI_from_config(config, mode, pin_option="cs_pin",
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default_speed=100000):
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# Determine pin from config
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ppins = config.get_printer().lookup_object("pins")
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cs_pin = config.get(pin_option)
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cs_pin_params = ppins.lookup_pin(cs_pin)
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pin = cs_pin_params['pin']
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if pin == 'None':
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ppins.reset_pin_sharing(cs_pin_params)
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pin = None
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# Load bus parameters
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mcu = cs_pin_params['chip']
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speed = config.getint('spi_speed', default_speed, minval=100000)
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if config.get('spi_software_sclk_pin', None) is not None:
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sw_pin_names = ['spi_software_%s_pin' % (name,)
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for name in ['miso', 'mosi', 'sclk']]
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sw_pin_params = [ppins.lookup_pin(config.get(name), share_type=name)
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for name in sw_pin_names]
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for pin_params in sw_pin_params:
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if pin_params['chip'] != mcu:
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raise ppins.error("%s: spi pins must be on same mcu" % (
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config.get_name(),))
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sw_pins = tuple([pin_params['pin'] for pin_params in sw_pin_params])
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bus = None
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else:
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bus = config.get('spi_bus', None)
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sw_pins = None
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# Create MCU_SPI object
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return MCU_SPI(mcu, bus, pin, mode, speed, sw_pins)
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######################################################################
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# I2C
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######################################################################
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# Helper code for working with devices connected to an MCU via an I2C bus
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class MCU_I2C:
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def __init__(self, mcu, bus, addr, speed):
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self.mcu = mcu
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self.bus = bus
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self.i2c_address = addr
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self.oid = self.mcu.create_oid()
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self.config_fmt = "config_i2c oid=%d i2c_bus=%%s rate=%d address=%d" % (
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self.oid, speed, addr)
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self.cmd_queue = self.mcu.alloc_command_queue()
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self.mcu.register_config_callback(self.build_config)
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self.i2c_write_cmd = self.i2c_read_cmd = self.i2c_modify_bits_cmd = None
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def get_oid(self):
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return self.oid
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def get_mcu(self):
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return self.mcu
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def get_i2c_address(self):
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return self.i2c_address
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def get_command_queue(self):
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return self.cmd_queue
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def build_config(self):
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bus = resolve_bus_name(self.mcu, "i2c_bus", self.bus)
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self.mcu.add_config_cmd(self.config_fmt % (bus,))
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self.i2c_write_cmd = self.mcu.lookup_command(
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"i2c_write oid=%c data=%*s", cq=self.cmd_queue)
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self.i2c_read_cmd = self.mcu.lookup_command(
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"i2c_read oid=%c reg=%*s read_len=%u", cq=self.cmd_queue)
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self.i2c_modify_bits_cmd = self.mcu.lookup_command(
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"i2c_modify_bits oid=%c reg=%*s clear_set_bits=%*s",
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cq=self.cmd_queue)
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def i2c_write(self, data, minclock=0, reqclock=0):
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if self.i2c_write_cmd is None:
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# Send setup message via mcu initialization
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data_msg = "".join(["%02x" % (x,) for x in data])
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self.mcu.add_config_cmd("i2c_write oid=%d data=%s" % (
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self.oid, data_msg), is_init=True)
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return
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self.i2c_write_cmd.send([self.oid, data],
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minclock=minclock, reqclock=reqclock)
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def i2c_read(self, write, read_len):
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return self.i2c_read_cmd.send_with_response(
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[self.oid, write, read_len], 'i2c_read_response', self.oid)
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def i2c_modify_bits(self, reg, clear_bits, set_bits,
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minclock=0, reqclock=0):
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clearset = clear_bits + set_bits
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if self.i2c_modify_bits_cmd is None:
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# Send setup message via mcu initialization
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reg_msg = "".join(["%02x" % (x,) for x in reg])
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clearset_msg = "".join(["%02x" % (x,) for x in clearset])
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self.mcu.add_config_cmd(
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"i2c_modify_bits oid=%d reg=%s clear_set_bits=%s" % (
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self.oid, reg_msg, clearset_msg), is_init=True)
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return
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self.i2c_modify_bits_cmd.send([self.oid, reg, clearset],
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minclock=minclock, reqclock=reqclock)
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def MCU_I2C_from_config(config, default_addr=None, default_speed=100000):
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# Load bus parameters
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printer = config.get_printer()
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i2c_mcu = mcu.get_printer_mcu(printer, config.get('i2c_mcu', 'mcu'))
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speed = config.getint('i2c_speed', default_speed, minval=100000)
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bus = config.get('i2c_bus', None)
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if default_addr is None:
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addr = config.getint('i2c_address', minval=0, maxval=127)
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else:
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addr = config.getint('i2c_address', default_addr, minval=0, maxval=127)
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# Create MCU_I2C object
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return MCU_I2C(i2c_mcu, bus, addr, speed)
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######################################################################
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# Bus synchronized digital outputs
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######################################################################
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# Helper code for a gpio that updates on a cmd_queue
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class MCU_bus_digital_out:
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def __init__(self, mcu, pin_desc, cmd_queue=None, value=0):
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self.mcu = mcu
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self.oid = mcu.create_oid()
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ppins = mcu.get_printer().lookup_object('pins')
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pin_params = ppins.lookup_pin(pin_desc)
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if pin_params['chip'] is not mcu:
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raise ppins.error("Pin %s must be on mcu %s" % (
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pin_desc, mcu.get_name()))
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mcu.add_config_cmd("config_digital_out oid=%d pin=%s value=%d"
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" default_value=%d max_duration=%d"
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% (self.oid, pin_params['pin'], value, value, 0))
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mcu.register_config_callback(self.build_config)
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if cmd_queue is None:
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cmd_queue = mcu.alloc_command_queue()
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self.cmd_queue = cmd_queue
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self.update_pin_cmd = None
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def get_oid(self):
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return self.oid
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def get_mcu(self):
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return self.mcu
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def get_command_queue(self):
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return self.cmd_queue
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def build_config(self):
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self.update_pin_cmd = self.mcu.lookup_command(
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"update_digital_out oid=%c value=%c", cq=self.cmd_queue)
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def update_digital_out(self, value, minclock=0, reqclock=0):
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if self.update_pin_cmd is None:
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# Send setup message via mcu initialization
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self.mcu.add_config_cmd("update_digital_out oid=%c value=%c"
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% (self.oid, not not value))
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return
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self.update_pin_cmd.send([self.oid, not not value],
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minclock=minclock, reqclock=reqclock)
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