klipper/klippy/extras/tmc2208.py

# TMC2208 UART communication and configuration
#
# Copyright (C) 2018-2019  Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import logging
import tmc, tmc2130

TMC_FREQUENCY=12000000.

Registers = {
    "GCONF": 0x00, "GSTAT": 0x01, "IFCNT": 0x02, "SLAVECONF": 0x03,
    "OTP_PROG": 0x04, "OTP_READ": 0x05, "IOIN": 0x06, "FACTORY_CONF": 0x07,
    "IHOLD_IRUN": 0x10, "TPOWERDOWN": 0x11, "TSTEP": 0x12, "TPWMTHRS": 0x13,
    "VACTUAL": 0x22, "MSCNT": 0x6a, "MSCURACT": 0x6b, "CHOPCONF": 0x6c,
    "DRV_STATUS": 0x6f, "PWMCONF": 0x70, "PWM_SCALE": 0x71, "PWM_AUTO": 0x72
}

ReadRegisters = [
    "GCONF", "GSTAT", "IFCNT", "OTP_READ", "IOIN", "FACTORY_CONF", "TSTEP",
    "MSCNT", "MSCURACT", "CHOPCONF", "DRV_STATUS",
    "PWMCONF", "PWM_SCALE", "PWM_AUTO"
]

Fields = {}

Fields["GCONF"] = {
    "I_scale_analog":      0x01,
    "internal_Rsense":     0x01 << 1,
    "en_spreadCycle":      0x01 << 2,
    "shaft":               0x01 << 3,
    "index_otpw":          0x01 << 4,
    "index_step":          0x01 << 5,
    "pdn_disable":         0x01 << 6,
    "mstep_reg_select":    0x01 << 7,
    "multistep_filt":      0x01 << 8,
    "test_mode":           0x01 << 9
}
Fields["GSTAT"] = {
    "reset":               0x01,
    "drv_err":             0x01 << 1,
    "uv_cp":               0x01 << 2
}
Fields["IFCNT"] = {
    "IFCNT":               0xff
}
Fields["SLAVECONF"] = {
    "SENDDELAY":           0x0f << 8
}
Fields["OTP_PROG"] = {
    "OTPBIT":              0x07,
    "OTPBYTE":             0x03 << 4,
    "OTPMAGIC":            0xff << 8
}
Fields["OTP_READ"] = {
    "OTP_FCLKTRIM":        0x1f,
    "otp_OTTRIM":          0x01 << 5,
    "otp_internalRsense":  0x01 << 6,
    "otp_TBL":             0x01 << 7,
    "OTP_PWM_GRAD":        0x0f << 8,
    "otp_pwm_autograd":    0x01 << 12,
    "OTP_TPWMTHRS":        0x07 << 13,
    "otp_PWM_OFS":         0x01 << 16,
    "otp_PWM_REG":         0x01 << 17,
    "otp_PWM_FREQ":        0x01 << 18,
    "OTP_IHOLDDELAY":      0x03 << 19,
    "OTP_IHOLD":           0x03 << 21,
    "otp_en_spreadCycle":  0x01 << 23
}
# IOIN mapping depends on the driver type (SEL_A field)
# TMC222x (SEL_A == 0)
Fields["IOIN@TMC222x"] = {
    "PDN_UART":            0x01 << 1,
    "SPREAD":              0x01 << 2,
    "DIR":                 0x01 << 3,
    "ENN":                 0x01 << 4,
    "STEP":                0x01 << 5,
    "MS1":                 0x01 << 6,
    "MS2":                 0x01 << 7,
    "SEL_A":               0x01 << 8,
    "VERSION":             0xff << 24
}
# TMC220x (SEL_A == 1)
Fields["IOIN@TMC220x"] = {
    "ENN":                 0x01,
    "MS1":                 0x01 << 2,
    "MS2":                 0x01 << 3,
    "DIAG":                0x01 << 4,
    "PDN_UART":            0x01 << 6,
    "STEP":                0x01 << 7,
    "SEL_A":               0x01 << 8,
    "DIR":                 0x01 << 9,
    "VERSION":             0xff << 24,
}
Fields["FACTORY_CONF"] = {
    "FCLKTRIM":            0x1f,
    "OTTRIM":              0x03 << 8
}
Fields["IHOLD_IRUN"] = {
    "IHOLD":               0x1f,
    "IRUN":                0x1f << 8,
    "IHOLDDELAY":          0x0f << 16
}
Fields["TPOWERDOWN"] = {
    "TPOWERDOWN":          0xff
}
Fields["TSTEP"] = {
    "TSTEP":               0xfffff
}
Fields["TPWMTHRS"] = {
    "TPWMTHRS":            0xfffff
}
Fields["VACTUAL"] = {
    "VACTUAL":             0xffffff
}
Fields["MSCNT"] = {
    "MSCNT":               0x3ff
}
Fields["MSCURACT"] = {
    "CUR_A":               0x1ff,
    "CUR_B":               0x1ff << 16
}
Fields["CHOPCONF"] = {
    "toff":                0x0f,
    "hstrt":               0x07 << 4,
    "hend":                0x0f << 7,
    "TBL":                 0x03 << 15,
    "vsense":              0x01 << 17,
    "MRES":                0x0f << 24,
    "intpol":              0x01 << 28,
    "dedge":               0x01 << 29,
    "diss2g":              0x01 << 30,
    "diss2vs":             0x01 << 31
}
Fields["DRV_STATUS"] = {
    "otpw":                0x01,
    "ot":                  0x01 << 1,
    "s2ga":                0x01 << 2,
    "s2gb":                0x01 << 3,
    "s2vsa":               0x01 << 4,
    "s2vsb":               0x01 << 5,
    "ola":                 0x01 << 6,
    "olb":                 0x01 << 7,
    "t120":                0x01 << 8,
    "t143":                0x01 << 9,
    "t150":                0x01 << 10,
    "t157":                0x01 << 11,
    "CS_ACTUAL":           0x1f << 16,
    "stealth":             0x01 << 30,
    "stst":                0x01 << 31
}
Fields["PWMCONF"] = {
    "PWM_OFS":             0xff,
    "PWM_GRAD":            0xff << 8,
    "pwm_freq":            0x03 << 16,
    "pwm_autoscale":       0x01 << 18,
    "pwm_autograd":        0x01 << 19,
    "freewheel":           0x03 << 20,
    "PWM_REG":             0xf << 24,
    "PWM_LIM":             0xf << 28
}
Fields["PWM_SCALE"] = {
    "PWM_SCALE_SUM":       0xff,
    "PWM_SCALE_AUTO":      0x1ff << 16
}
Fields["PWM_AUTO"] = {
    "PWM_OFS_AUTO":        0xff,
    "PWM_GRAD_AUTO":       0xff << 16
}

SignedFields = ["CUR_A", "CUR_B", "PWM_SCALE_AUTO"]

FieldFormatters = dict(tmc2130.FieldFormatters)
FieldFormatters.update({
    "SEL_A":            (lambda v: "%d(%s)" % (v, ["TMC222x", "TMC220x"][v])),
    "s2vsa":            (lambda v: "1(LowSideShort_A!)" if v else ""),
    "s2vsb":            (lambda v: "1(LowSideShort_B!)" if v else ""),
})


######################################################################
# TMC uart analog mux support
######################################################################

class MCU_analog_mux:
    def __init__(self, mcu, cmd_queue, select_pins_desc):
        self.mcu = mcu
        self.cmd_queue = cmd_queue
        ppins = mcu.get_printer().lookup_object("pins")
        select_pin_params = [ppins.lookup_pin(spd, can_invert=True)
                             for spd in select_pins_desc.split(',')]
        self.oids = [self.mcu.create_oid() for pp in select_pin_params]
        self.pins = [pp['pin'] for pp in select_pin_params]
        self.pin_values = tuple([0 for pp in select_pin_params])
        for oid, pin, value in zip(self.oids, self.pins, self.pin_values):
            self.mcu.add_config_cmd("config_digital_out oid=%d pin=%s"
                                    " value=%d default_value=0 max_duration=0"
                                    % (oid, pin, value))
        self.update_pin_cmd = None
        self.mcu.register_config_callback(self.build_config)
    def build_config(self):
        self.update_pin_cmd = self.mcu.lookup_command(
            "update_digital_out oid=%c value=%c", cq=self.cmd_queue)
    def get_instance_id(self, select_pins_desc):
        ppins = self.mcu.get_printer().lookup_object("pins")
        select_pin_params = [ppins.parse_pin(spd, can_invert=True)
                             for spd in select_pins_desc.split(',')]
        for pin_params in select_pin_params:
            if pin_params['chip'] != self.mcu:
                raise self.mcu.get_printer().config_error(
                    "TMC mux pins must be on the same mcu")
        pins = [pp['pin'] for pp in select_pin_params]
        if pins != self.pins:
            raise self.mcu.get_printer().config_error(
                "All TMC mux instances must use identical pins")
        return tuple([not pp['invert'] for pp in select_pin_params])
    def activate(self, instance_id):
        for oid, old, new in zip(self.oids, self.pin_values, instance_id):
            if old != new:
                self.update_pin_cmd.send([oid, new])
        self.pin_values = instance_id


######################################################################
# TMC2208 uart communication
######################################################################

# Code for sending messages on a TMC uart
class MCU_TMC_uart_bitbang:
    def __init__(self, rx_pin_params, tx_pin_params, select_pins_desc):
        self.mcu = rx_pin_params['chip']
        self.pullup = rx_pin_params['pullup']
        self.rx_pin = rx_pin_params['pin']
        self.tx_pin = tx_pin_params['pin']
        self.oid = self.mcu.create_oid()
        self.cmd_queue = self.mcu.alloc_command_queue()
        self.analog_mux = None
        if select_pins_desc is not None:
            self.analog_mux = MCU_analog_mux(self.mcu, self.cmd_queue,
                                             select_pins_desc)
        self.tmcuart_send_cmd = None
        self.mcu.register_config_callback(self.build_config)
    def build_config(self):
        bit_ticks = int(self.mcu.get_adjusted_freq() / 9000.)
        self.mcu.add_config_cmd(
            "config_tmcuart oid=%d rx_pin=%s pull_up=%d tx_pin=%s bit_time=%d"
            % (self.oid, self.rx_pin, self.pullup, self.tx_pin, bit_ticks))
        self.tmcuart_send_cmd = self.mcu.lookup_command(
            "tmcuart_send oid=%c write=%*s read=%c", cq=self.cmd_queue)
    def register_instance(self, rx_pin_params, tx_pin_params, select_pins_desc):
        if (rx_pin_params['pin'] != self.rx_pin
            or tx_pin_params['pin'] != self.tx_pin
            or (select_pins_desc is None) != (self.analog_mux is None)):
            raise self.mcu.get_printer().config_error(
                "Shared TMC uart must use identical pins")
        instance_id = None
        if self.analog_mux is not None:
            instance_id = self.analog_mux.get_instance_id(select_pins_desc)
        return instance_id
    def _calc_crc8(self, data):
        # Generate a CRC8-ATM value for a bytearray
        crc = 0
        for b in data:
            for i in range(8):
                if (crc >> 7) ^ (b & 0x01):
                    crc = (crc << 1) ^ 0x07
                else:
                    crc = (crc << 1)
                crc &= 0xff
                b >>= 1
        return crc
    def _add_serial_bits(self, data):
        # Add serial start and stop bits to a message in a bytearray
        out = 0
        pos = 0
        for d in data:
            b = (d << 1) | 0x200
            out |= (b << pos)
            pos += 10
        res = bytearray()
        for i in range((pos+7)//8):
            res.append((out >> (i*8)) & 0xff)
        return res
    def _encode_read(self, sync, addr, reg):
        # Generate a tmc2208 read register message
        msg = bytearray([sync, addr, reg])
        msg.append(self._calc_crc8(msg))
        return self._add_serial_bits(msg)
    def _encode_write(self, sync, addr, reg, val):
        # Generate a tmc2208 write register message
        msg = bytearray([sync, addr, reg, (val >> 24) & 0xff,
                         (val >> 16) & 0xff, (val >> 8) & 0xff, val & 0xff])
        msg.append(self._calc_crc8(msg))
        return self._add_serial_bits(msg)
    def _decode_read(self, reg, data):
        # Extract a tmc2208 read response message
        if len(data) != 10:
            return None
        # Convert data into a long integer for easy manipulation
        mval = pos = 0
        for d in bytearray(data):
            mval |= d << pos
            pos += 8
        # Extract register value
        val = ((((mval >> 31) & 0xff) << 24) | (((mval >> 41) & 0xff) << 16)
               | (((mval >> 51) & 0xff) << 8) | ((mval >> 61) & 0xff))
        # Verify start/stop bits and crc
        encoded_data = self._encode_write(0x05, 0xff, reg, val)
        if data != encoded_data:
            return None
        return val
    def reg_read(self, instance_id, addr, reg):
        if self.analog_mux is not None:
            self.analog_mux.activate(instance_id)
        msg = self._encode_read(0xf5, addr, reg)
        params = self.tmcuart_send_cmd.send_with_response(
            [self.oid, msg, 10], 'tmcuart_response', self.oid)
        return self._decode_read(reg, params['read'])
    def reg_write(self, instance_id, addr, reg, val):
        if self.analog_mux is not None:
            self.analog_mux.activate(instance_id)
        msg = self._encode_write(0xf5, 0x00, reg | 0x80, val)
        self.tmcuart_send_cmd.send_with_response(
            [self.oid, msg, 0], 'tmcuart_response', self.oid)

# Lookup a (possibly shared) tmc uart
def lookup_tmc_uart_bitbang(config):
    ppins = config.get_printer().lookup_object("pins")
    rx_pin_params = ppins.lookup_pin(
        config.get('uart_pin'), can_pullup=True, share_type="tmc_uart_rx")
    tx_pin_desc = config.get('tx_pin', None)
    if tx_pin_desc is None:
        tx_pin_params = rx_pin_params
    else:
        tx_pin_params = ppins.lookup_pin(tx_pin_desc, share_type="tmc_uart_tx")
    if rx_pin_params['chip'] is not tx_pin_params['chip']:
        raise ppins.error("TMC uart rx and tx pins must be on the same mcu")
    select_pins_desc = config.get('select_pins', None)
    mcu_uart = rx_pin_params.get('class')
    if mcu_uart is None:
        mcu_uart = MCU_TMC_uart_bitbang(rx_pin_params, tx_pin_params,
                                        select_pins_desc)
        rx_pin_params['class'] = mcu_uart
    instance_id = mcu_uart.register_instance(rx_pin_params, tx_pin_params,
                                             select_pins_desc)
    return instance_id, mcu_uart

# Helper code for communicating via TMC uart
class MCU_TMC_uart:
    def __init__(self, config, name_to_reg, fields):
        self.printer = config.get_printer()
        self.name = config.get_name().split()[-1]
        self.name_to_reg = name_to_reg
        self.fields = fields
        self.ifcnt = None
        self.addr = 0
        self.instance_id, self.mcu_uart = lookup_tmc_uart_bitbang(config)
    def get_fields(self):
        return self.fields
    def get_register(self, reg_name):
        reg = self.name_to_reg[reg_name]
        if self.printer.get_start_args().get('debugoutput') is not None:
            return 0
        for retry in range(5):
            val = self.mcu_uart.reg_read(self.instance_id, self.addr, reg)
            if val is not None:
                return val
        raise self.printer.command_error(
            "Unable to read tmc2208 '%s' register %s" % (self.name, reg_name))
    def set_register(self, reg_name, val, print_time=0.):
        reg = self.name_to_reg[reg_name]
        if self.printer.get_start_args().get('debugoutput') is not None:
            return
        for retry in range(5):
            ifcnt = self.ifcnt
            if ifcnt is None:
                self.ifcnt = ifcnt = self.get_register("IFCNT")
            self.mcu_uart.reg_write(self.instance_id, self.addr, reg, val)
            self.ifcnt = self.get_register("IFCNT")
            if self.ifcnt == (ifcnt + 1) & 0xff:
                return
        raise self.printer.command_error(
            "Unable to write tmc2208 '%s' register %s" % (self.name, reg_name))


######################################################################
# TMC2208 printer object
######################################################################

class TMC2208:
    def __init__(self, config):
        # Setup mcu communication
        self.fields = tmc.FieldHelper(Fields, SignedFields, FieldFormatters)
        self.mcu_tmc = MCU_TMC_uart(config, Registers, self.fields)
        # Register commands
        cmdhelper = tmc.TMCCommandHelper(config, self.mcu_tmc)
        cmdhelper.setup_register_dump(self.query_registers)
        # Setup basic register values
        self.fields.set_field("pdn_disable", True)
        self.fields.set_field("mstep_reg_select", True)
        self.fields.set_field("multistep_filt", True)
        tmc2130.TMCCurrentHelper(config, self.mcu_tmc)
        mh = tmc.TMCMicrostepHelper(config, self.mcu_tmc)
        self.get_microsteps = mh.get_microsteps
        self.get_phase = mh.get_phase
        tmc.TMCStealthchopHelper(config, self.mcu_tmc, TMC_FREQUENCY)
        # Allow other registers to be set from the config
        set_config_field = self.fields.set_config_field
        set_config_field(config, "toff", 3)
        set_config_field(config, "hstrt", 5)
        set_config_field(config, "hend", 0)
        set_config_field(config, "TBL", 2)
        set_config_field(config, "intpol", True, "interpolate")
        set_config_field(config, "IHOLDDELAY", 8)
        set_config_field(config, "TPOWERDOWN", 20)
        set_config_field(config, "PWM_OFS", 36)
        set_config_field(config, "PWM_GRAD", 14)
        set_config_field(config, "pwm_freq", 1)
        set_config_field(config, "pwm_autoscale", True)
        set_config_field(config, "pwm_autograd", True)
        set_config_field(config, "PWM_REG", 8)
        set_config_field(config, "PWM_LIM", 12)
    def query_registers(self, print_time=0.):
        out = []
        for reg_name in ReadRegisters:
            val = self.mcu_tmc.get_register(reg_name)
            # IOIN has different mappings depending on the driver type
            # (SEL_A field of IOIN reg)
            if reg_name == "IOIN":
                drv_type = self.fields.get_field("SEL_A", val)
                reg_name = "IOIN@TMC220x" if drv_type else "IOIN@TMC222x"
            out.append((reg_name, val))
        return out

def load_config_prefix(config):
    return TMC2208(config)