X-Git-Url: https://git.ayoreis.com/Adafruit_Blinka-hackapet.git/blobdiff_plain/021c1242f9633bfdf2d83c55daec8df750577296..d3636d7313d5a05b6f321ad09d53f92d3d47fee0:/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py diff --git a/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py b/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py index 39b1c07..e5b24bb 100644 --- a/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py +++ b/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py @@ -1,7 +1,43 @@ +"""Chip Definition for MCP2221""" + +import os import time import hid +# Here if you need it +MCP2221_HID_DELAY = float(os.environ.get("BLINKA_MCP2221_HID_DELAY", 0)) +# Use to set delay between reset and device reopen. if negative, don't reset at all +MCP2221_RESET_DELAY = float(os.environ.get("BLINKA_MCP2221_RESET_DELAY", 0.5)) + +# from the C driver +# http://ww1.microchip.com/downloads/en/DeviceDoc/mcp2221_0_1.tar.gz +# others (???) determined during driver developement +RESP_ERR_NOERR = 0x00 +RESP_ADDR_NACK = 0x25 +RESP_READ_ERR = 0x7F +RESP_READ_COMPL = 0x55 +RESP_READ_PARTIAL = 0x54 # ??? +RESP_I2C_IDLE = 0x00 +RESP_I2C_START_TOUT = 0x12 +RESP_I2C_RSTART_TOUT = 0x17 +RESP_I2C_WRADDRL_TOUT = 0x23 +RESP_I2C_WRADDRL_WSEND = 0x21 +RESP_I2C_WRADDRL_NACK = 0x25 +RESP_I2C_WRDATA_TOUT = 0x44 +RESP_I2C_RDDATA_TOUT = 0x52 +RESP_I2C_STOP_TOUT = 0x62 + +RESP_I2C_MOREDATA = 0x43 # ??? +RESP_I2C_PARTIALDATA = 0x41 # ??? +RESP_I2C_WRITINGNOSTOP = 0x45 # ??? + +MCP2221_RETRY_MAX = 50 +MCP2221_MAX_I2C_DATA_LEN = 60 +MASK_ADDR_NACK = 0x40 + + class MCP2221: + """MCP2221 Device Class Definition""" VID = 0x04D8 PID = 0x00DD @@ -15,62 +51,74 @@ class MCP2221: def __init__(self): self._hid = hid.device() self._hid.open(MCP2221.VID, MCP2221.PID) - self._reset() + if MCP2221_RESET_DELAY >= 0: + self._reset() + self._gp_config = [0x07] * 4 # "don't care" initial value + for pin in range(4): + self.gp_set_mode(pin, self.GP_GPIO) # set to GPIO mode + self.gpio_set_direction(pin, 1) # set to INPUT def _hid_xfer(self, report, response=True): + """Perform HID Transfer""" # first byte is report ID, which =0 for MCP2221 # remaing bytes = 64 byte report data # https://github.com/libusb/hidapi/blob/083223e77952e1ef57e6b77796536a3359c1b2a3/hidapi/hidapi.h#L185 - self._hid.write(b'\0' + report + b'\0'*(64-len(report))) + self._hid.write(b"\0" + report + b"\0" * (64 - len(report))) + time.sleep(MCP2221_HID_DELAY) if response: # return is 64 byte response report return self._hid.read(64) + return None - #---------------------------------------------------------------- + # ---------------------------------------------------------------- # MISC - #---------------------------------------------------------------- + # ---------------------------------------------------------------- def gp_get_mode(self, pin): - return self._hid_xfer(b'\x61')[22+pin] & 0x07 + """Get Current Pin Mode""" + return self._hid_xfer(b"\x61")[22 + pin] & 0x07 def gp_set_mode(self, pin, mode): - # get current settings - current = self._hid_xfer(b'\x61') + """Set Current Pin Mode""" + # already set to that mode? + mode &= 0x07 + if mode == (self._gp_config[pin] & 0x07): + return + # update GP mode for pin + self._gp_config[pin] = mode # empty report, this is safe since 0's = no change - report = bytearray(b'\x60'+b'\x00'*63) + report = bytearray(b"\x60" + b"\x00" * 63) # set the alter GP flag byte report[7] = 0xFF - # each pin can be set individually - # but all 4 get set at once, so we need to - # transpose current settings - report[8] = current[22] # GP0 - report[9] = current[23] # GP1 - report[10] = current[24] # GP2 - report[11] = current[25] # GP3 - # then change only the one - report[8+pin] = mode & 0x07 + # add GP setttings + report[8] = self._gp_config[0] + report[9] = self._gp_config[1] + report[10] = self._gp_config[2] + report[11] = self._gp_config[3] # and make it so self._hid_xfer(report) - def _pretty_report(self, report): + def _pretty_report(self, register): + report = self._hid_xfer(register) print(" 0 1 2 3 4 5 6 7 8 9") index = 0 for row in range(7): - print("{} : ".format(row), end='') + print("{} : ".format(row), end="") for _ in range(10): - print("{:02x} ".format(report[index]), end='') + print("{:02x} ".format(report[index]), end="") index += 1 if index > 63: break print() def _status_dump(self): - self._pretty_report(self._hid_xfer(b'\x10')) + self._pretty_report(b"\x10") def _sram_dump(self): - self._pretty_report(self._hid_xfer(b'\x61')) + self._pretty_report(b"\x61") def _reset(self): - self._hid_xfer(b'\x70\xAB\xCD\xEF', response=False) + self._hid_xfer(b"\x70\xAB\xCD\xEF", response=False) + time.sleep(MCP2221_RESET_DELAY) start = time.monotonic() while time.monotonic() - start < 5: try: @@ -82,160 +130,257 @@ class MCP2221: return raise OSError("open failed") - #---------------------------------------------------------------- + # ---------------------------------------------------------------- # GPIO - #---------------------------------------------------------------- + # ---------------------------------------------------------------- def gpio_set_direction(self, pin, mode): - report = bytearray(b'\x50'+b'\x00'*63) # empty set GPIO report + """Set Current GPIO Pin Direction""" + if mode: + # set bit 3 for INPUT + self._gp_config[pin] |= 1 << 3 + else: + # clear bit 3 for OUTPUT + self._gp_config[pin] &= ~(1 << 3) + report = bytearray(b"\x50" + b"\x00" * 63) # empty set GPIO report offset = 4 * (pin + 1) - report[offset] = 0x01 # set pin direction - report[offset+1] = mode # to this + report[offset] = 0x01 # set pin direction + report[offset + 1] = mode # to this self._hid_xfer(report) def gpio_set_pin(self, pin, value): - report = bytearray(b'\x50'+b'\x00'*63) # empty set GPIO report + """Set Current GPIO Pin Value""" + if value: + # set bit 4 + self._gp_config[pin] |= 1 << 4 + else: + # clear bit 4 + self._gp_config[pin] &= ~(1 << 4) + report = bytearray(b"\x50" + b"\x00" * 63) # empty set GPIO report offset = 2 + 4 * pin - report[offset] = 0x01 # set pin value - report[offset+1] = value # to this + report[offset] = 0x01 # set pin value + report[offset + 1] = value # to this self._hid_xfer(report) def gpio_get_pin(self, pin): - resp = self._hid_xfer(b'\x51') + """Get Current GPIO Pin Value""" + resp = self._hid_xfer(b"\x51") offset = 2 + 2 * pin if resp[offset] == 0xEE: raise RuntimeError("Pin is not set for GPIO operation.") - else: - return resp[offset] + return resp[offset] - #---------------------------------------------------------------- + # ---------------------------------------------------------------- # I2C - # - # cribbed from the C driver - # http://ww1.microchip.com/downloads/en/DeviceDoc/mcp2221_0_1.tar.gz - # define RESP_I2C_IDLE 0x00 - # define RESP_I2C_START_TOUT 0x12 - # define RESP_I2C_RSTART_TOUT 0x17 - # define RESP_I2C_WRADDRL_TOUT 0x23 - # define RESP_I2C_WRADDRL_WSEND 0x21 - # define RESP_I2C_WRADDRL_NACK 0x25 - # define RESP_I2C_WRDATA_TOUT 0x44 - # define RESP_I2C_RDDATA_TOUT 0x52 - # define RESP_I2C_STOP_TOUT 0x62 - #---------------------------------------------------------------- + # ---------------------------------------------------------------- def _i2c_status(self): - return self._hid_xfer(b'\x10')[8] + resp = self._hid_xfer(b"\x10") + if resp[1] != 0: + raise RuntimeError("Couldn't get I2C status") + return resp + + def _i2c_state(self): + return self._i2c_status()[8] def _i2c_cancel(self): - resp = self._hid_xfer(b'\x10\x00\x10') + resp = self._hid_xfer(b"\x10\x00\x10") + if resp[1] != 0x00: + raise RuntimeError("Couldn't cancel I2C") if resp[2] == 0x10: # bus release will need "a few hundred microseconds" time.sleep(0.001) + # pylint: disable=too-many-arguments def _i2c_write(self, cmd, address, buffer, start=0, end=None): - if self._i2c_status(): + if self._i2c_state() != 0x00: self._i2c_cancel() + end = end if end else len(buffer) length = end - start retries = 0 - while (end - start) > 0: - chunk = min(end - start, 60) + + while (end - start) > 0 or not buffer: + chunk = min(end - start, MCP2221_MAX_I2C_DATA_LEN) # write out current chunk - resp = self._hid_xfer(bytes([cmd, - length & 0xFF, - (length >> 8) & 0xFF, - address << 1]) + - buffer[start:(start+chunk)]) + resp = self._hid_xfer( + bytes([cmd, length & 0xFF, (length >> 8) & 0xFF, address << 1]) + + buffer[start : (start + chunk)] + ) # check for success if resp[1] != 0x00: + if resp[2] in ( + RESP_I2C_START_TOUT, + RESP_I2C_WRADDRL_TOUT, + RESP_I2C_WRADDRL_NACK, + RESP_I2C_WRDATA_TOUT, + RESP_I2C_STOP_TOUT, + ): + raise RuntimeError("Unrecoverable I2C state failure") retries += 1 - if retries >= 5: + if retries >= MCP2221_RETRY_MAX: raise RuntimeError("I2C write error, max retries reached.") time.sleep(0.001) - continue # try again + continue # try again + # yay chunk sent! + while self._i2c_state() == RESP_I2C_PARTIALDATA: + time.sleep(0.001) + if not buffer: + break start += chunk retries = 0 + # check status in another loop + for _ in range(MCP2221_RETRY_MAX): + status = self._i2c_status() + if status[20] & MASK_ADDR_NACK: + raise RuntimeError("I2C slave address was NACK'd") + usb_cmd_status = status[8] + if usb_cmd_status == 0: + break + if usb_cmd_status == RESP_I2C_WRITINGNOSTOP and cmd == 0x94: + break # this is OK too! + if usb_cmd_status in ( + RESP_I2C_START_TOUT, + RESP_I2C_WRADDRL_TOUT, + RESP_I2C_WRADDRL_NACK, + RESP_I2C_WRDATA_TOUT, + RESP_I2C_STOP_TOUT, + ): + raise RuntimeError("Unrecoverable I2C state failure") + time.sleep(0.001) + else: + raise RuntimeError("I2C write error: max retries reached.") + # whew success! + def _i2c_read(self, cmd, address, buffer, start=0, end=None): - if self._i2c_status(): + if self._i2c_state() not in (RESP_I2C_WRITINGNOSTOP, 0): self._i2c_cancel() + end = end if end else len(buffer) length = end - start - retries = 0 + + # tell it we want to read + resp = self._hid_xfer( + bytes([cmd, length & 0xFF, (length >> 8) & 0xFF, (address << 1) | 0x01]) + ) + + # check for success + if resp[1] != 0x00: + raise RuntimeError("Unrecoverable I2C read failure") + + # and now the read part while (end - start) > 0: - # tell it we want to read - resp = self._hid_xfer(bytes([cmd, - length & 0xFF, - (length >> 8) & 0xFF, - (address << 1) | 0x01])) - # and then actually read - resp = self._hid_xfer(b'\x40') - # check for success - if resp[1] != 0x00: - retries += 1 - if retries >= 5: - raise RuntimeError("I2C write error, max retries reached.") - time.sleep(0.001) - continue + for _ in range(MCP2221_RETRY_MAX): + # the actual read + resp = self._hid_xfer(b"\x40") + # check for success + if resp[1] == RESP_I2C_PARTIALDATA: + time.sleep(0.001) + continue + if resp[1] != 0x00: + raise RuntimeError("Unrecoverable I2C read failure") + if resp[2] == RESP_ADDR_NACK: + raise RuntimeError("I2C NACK") + if resp[3] == 0x00 and resp[2] == 0x00: + break + if resp[3] == RESP_READ_ERR: + time.sleep(0.001) + continue + if resp[2] in (RESP_READ_COMPL, RESP_READ_PARTIAL): + break + else: + raise RuntimeError("I2C read error: max retries reached.") + # move data into buffer chunk = min(end - start, 60) - for i, k in enumerate(range(start, start+chunk)): + for i, k in enumerate(range(start, start + chunk)): buffer[k] = resp[4 + i] start += chunk - def i2c_configure(self, baudrate=100000): - self._hid_xfer(bytes([0x10, # set parameters - 0x00, # don't care - 0x00, # no effect - 0x20, # next byte is clock divider - 12000000 // baudrate - 3])) + # pylint: enable=too-many-arguments + + def _i2c_configure(self, baudrate=100000): + """Configure I2C""" + self._hid_xfer( + bytes( + [ + 0x10, # set parameters + 0x00, # don't care + 0x00, # no effect + 0x20, # next byte is clock divider + 12000000 // baudrate - 3, + ] + ) + ) def i2c_writeto(self, address, buffer, *, start=0, end=None): + """Write data from the buffer to an address""" self._i2c_write(0x90, address, buffer, start, end) def i2c_readfrom_into(self, address, buffer, *, start=0, end=None): + """Read data from an address and into the buffer""" self._i2c_read(0x91, address, buffer, start, end) - def i2c_writeto_then_readfrom(self, address, out_buffer, in_buffer, *, - out_start=0, out_end=None, - in_start=0, in_end=None): + def i2c_writeto_then_readfrom( + self, + address, + out_buffer, + in_buffer, + *, + out_start=0, + out_end=None, + in_start=0, + in_end=None, + ): + """Write data from buffer_out to an address and then + read data from an address and into buffer_in + """ self._i2c_write(0x94, address, out_buffer, out_start, out_end) self._i2c_read(0x93, address, in_buffer, in_start, in_end) def i2c_scan(self, *, start=0, end=0x79): + """Perform an I2C Device Scan""" found = [] - for addr in range(start, end+1): + for addr in range(start, end + 1): # try a write - self.i2c_writeto(addr, b'\x00') + try: + self.i2c_writeto(addr, b"\x00") + except RuntimeError: # no reply! + continue # store if success - if self._i2c_status() == 0x00: - found.append(addr) - # cancel and continue - self._i2c_cancel() + found.append(addr) return found - #---------------------------------------------------------------- + # ---------------------------------------------------------------- # ADC - #---------------------------------------------------------------- + # ---------------------------------------------------------------- def adc_configure(self, vref=0): - report = bytearray(b'\x60'+b'\x00'*63) + """Configure the Analog-to-Digital Converter""" + report = bytearray(b"\x60" + b"\x00" * 63) report[5] = 1 << 7 | (vref & 0b111) self._hid_xfer(report) def adc_read(self, pin): - resp = self._hid_xfer(b'\x10') + """Read from the Analog-to-Digital Converter""" + resp = self._hid_xfer(b"\x10") return resp[49 + 2 * pin] << 8 | resp[48 + 2 * pin] - #---------------------------------------------------------------- + # ---------------------------------------------------------------- # DAC - #---------------------------------------------------------------- + # ---------------------------------------------------------------- def dac_configure(self, vref=0): - report = bytearray(b'\x60'+b'\x00'*63) + """Configure the Digital-to-Analog Converter""" + report = bytearray(b"\x60" + b"\x00" * 63) report[3] = 1 << 7 | (vref & 0b111) self._hid_xfer(report) + # pylint: disable=unused-argument def dac_write(self, pin, value): - report = bytearray(b'\x60'+b'\x00'*63) + """Write to the Digital-to-Analog Converter""" + report = bytearray(b"\x60" + b"\x00" * 63) report[4] = 1 << 7 | (value & 0b11111) self._hid_xfer(report) + # pylint: enable=unused-argument + + mcp2221 = MCP2221()