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163 lines
5.0 KiB
163 lines
5.0 KiB
from adafruit_blinka import Enum, Lockable, agnostic
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class I2C(Lockable):
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def __init__(self, scl, sda, frequency=400000):
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self.init(scl, sda, frequency)
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def init(self, scl, sda, frequency):
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self.deinit()
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from machine import I2C as _I2C
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from microcontroller.pin import i2cPorts
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for portId, portScl, portSda in i2cPorts:
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if scl == portScl and sda == portSda:
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self._i2c = I2C(portId, mode=_I2C.MASTER, baudrate=frequency)
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break
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else:
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raise NotImplementedError("No Hardware I2C on (scl,sda)={}\nValid UART ports".format(
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(scl, sda), i2cPorts))
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def deinit(self):
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try:
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del self._i2c
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except AttributeError:
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pass
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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self.deinit()
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def scan(self):
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return self._i2c.scan()
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def readfrom_into(self, address, buffer, start=0, end=None):
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if start is not 0 or end is not None:
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if end is None:
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end = len(buffer)
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buffer = memoryview(buffer)[start:end]
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stop = True # remove for efficiency later
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return self._i2c.readfrom_into(address, buffer, stop)
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def writeto(self, address, buffer, start=0, end=None, stop=True):
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if start is not 0 or end is not None:
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if end is None:
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return self._i2c.writeto(address, memoryview(buffer)[start:], stop)
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else:
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return self._i2c.writeto(address, memoryview(buffer)[start:end], stop)
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return self._i2c.writeto(address, buffer, stop)
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class SPI(Lockable):
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def __init__(self, clock, MOSI=None, MISO=None):
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from microcontroller.pin import spiPorts
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for portId, portSck, portMosi, portMiso in spiPorts:
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if clock == portSck and MOSI == portMosi and MISO == portMiso:
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self._spi = SPI(portId)
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self._pins = (portSck, portMosi, portMiso)
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break
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else:
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raise NotImplementedError(
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"No Hardware SPI on (clock, MOSI, MISO)={}\nValid SPI ports:{}".
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format((clock, MOSI, MISO), spiPorts))
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def configure(self, baudrate=100000, polarity=0, phase=0, bits=8):
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if self._locked:
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from machine import Pin
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# TODO check if #init ignores MOSI=None rather than unsetting, to save _pinIds attribute
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self._spi.init(
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baudrate=baudrate,
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polarity=polarity,
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phase=phase,
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bits=bits,
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firstbit=SPI.MSB,
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sck=Pin(self._pins[0].id),
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mosi=Pin(self._pins[1].id),
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miso=Pin(self._pins[2].id)
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)
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else:
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raise RuntimeError("First call try_lock()")
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def deinit(self):
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self._spi = None
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self._pinIds = None
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def write(self, buf):
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return self._spi.write(buf)
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def readinto(self, buf):
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return self.readinto(buf)
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def write_readinto(self, buffer_out, buffer_in):
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return self.write_readinto(buffer_out, buffer_in)
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class UART(Lockable):
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class Parity(Enum):
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pass
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Parity.ODD = Parity()
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Parity.EVEN = Parity()
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def __init__(self,
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tx,
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rx,
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baudrate=9600,
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bits=8,
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parity=None,
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stop=1,
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timeout=1000,
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receiver_buffer_size=64,
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flow=None):
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from machine import UART as _UART
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from microcontroller.pin import uartPorts
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self.baudrate = baudrate
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if flow is not None: # default 0
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raise NotImplementedError(
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"Parameter '{}' unsupported on {}".format(
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"flow", agnostic.board))
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# translate parity flag for Micropython
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if parity is UART.Parity.ODD:
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parity = 1
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elif parity is UART.Parity.EVEN:
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parity = 0
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elif parity is None:
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pass
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else:
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raise ValueError("Invalid parity")
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# check tx and rx have hardware support
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for portId, portTx, portRx in uartPorts: #
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if portTx == tx and portRx == rx:
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self._uart = _UART(
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portId,
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baudrate,
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bits=bits,
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parity=parity,
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stop=stop,
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timeout=timeout,
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read_buf_len=receiver_buffer_size
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)
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break
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else:
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raise NotImplementedError(
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"No Hardware UART on (tx,rx)={}\nValid UART ports".format(
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(tx, rx), uartPorts))
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def deinit(self):
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self._uart = None
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def read(self, nbytes=None):
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return self._uart.read(nbytes)
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def readinto(self, buf, nbytes=None):
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return self._uart.readinto(buf, nbytes)
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def readline(self):
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return self._uart.readline()
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def write(self, buf):
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return self._uart.write(buf)
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