+"""
+`busio` - Bus protocol support like I2C and SPI
+=================================================
+
+See `CircuitPython:busio` in CircuitPython for more details.
+
+* Author(s): cefn
+"""
+
from adafruit_blinka import Enum, Lockable, agnostic
+from adafruit_blinka.agnostic import board_name
+import adafruit_platformdetect.board as ap_board
+
+SUPPORTED_BOARDS = (
+ ap_board.RASPBERRY_PI_2B,
+ ap_board.RASPBERRY_PI_3B,
+ ap_board.RASPBERRY_PI_3B_PLUS,
+ ap_board.BEAGLEBONE_BLACK,
+ ap_board.ORANGEPI_PC,
+)
+
+class I2C(Lockable):
+ def __init__(self, scl, sda, frequency=400000):
+ self.init(scl, sda, frequency)
+
+ def init(self, scl, sda, frequency):
+ self.deinit()
+ if board_name in SUPPORTED_BOARDS:
+ from adafruit_blinka.microcontroller.generic_linux.i2c import I2C as _I2C
+ else:
+ from machine import I2C as _I2C
+ from microcontroller.pin import i2cPorts
+ for portId, portScl, portSda in i2cPorts:
+ if scl == portScl and sda == portSda:
+ self._i2c = _I2C(portId, mode=_I2C.MASTER, baudrate=frequency)
+ break
+ else:
+ raise NotImplementedError("No Hardware I2C on (scl,sda)={}\nValid UART ports".format(
+ (scl, sda), i2cPorts))
+ def deinit(self):
+ try:
+ del self._i2c
+ except AttributeError:
+ pass
+
+ def __enter__(self):
+ return self
+
+ def __exit__(self, exc_type, exc_value, traceback):
+ self.deinit()
+
+ def scan(self):
+ return self._i2c.scan()
+
+ def readfrom_into(self, address, buffer, *, start=0, end=None):
+ if start is not 0 or end is not None:
+ if end is None:
+ end = len(buffer)
+ buffer = memoryview(buffer)[start:end]
+ stop = True # remove for efficiency later
+ return self._i2c.readfrom_into(address, buffer, stop=stop)
+
+ def writeto(self, address, buffer, *, start=0, end=None, stop=True):
+ if isinstance(buffer, str):
+ buffer = bytes([ord(x) for x in buffer])
+ if start is not 0 or end is not None:
+ if end is None:
+ return self._i2c.writeto(address, memoryview(buffer)[start:], stop=stop)
+ else:
+ return self._i2c.writeto(address, memoryview(buffer)[start:end], stop=stop)
+ return self._i2c.writeto(address, buffer, stop=stop)
+
+ def writeto_then_readfrom(self, address, buffer_out, buffer_in, *, out_start=0, out_end=None, in_start=0, in_end=None, stop=False):
+ return self._i2c.writeto_then_readfrom(address, buffer_out, buffer_in,
+ out_start=out_start, out_end=out_end,
+ in_start=in_start, in_end=in_end, stop=stop)
class SPI(Lockable):
def __init__(self, clock, MOSI=None, MISO=None):
- from microcontroller import spiPorts
- for spiId, sck, mosi, miso in spiPorts:
- if sck == clock.id and mosi == MOSI.id and miso == MISO.id:
- self._spi = SPI(spiId)
- self._pinIds = (sck, mosi, miso)
+ self.deinit()
+ if board_name in SUPPORTED_BOARDS:
+ from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
+ else:
+ from machine import SPI as _SPI
+ from microcontroller.pin import spiPorts
+ for portId, portSck, portMosi, portMiso in spiPorts:
+ if ((clock == portSck) and # Clock is required!
+ (MOSI == portMosi or MOSI == None) and # But can do with just output
+ (MISO == portMiso or MISO == None)): # Or just input
+ self._spi = _SPI(portId)
+ self._pins = (portSck, portMosi, portMiso)
break
else:
raise NotImplementedError(
- "No Hardware SPI on (clock, MOSI, MISO)={}\nValid SPI ports:{}".
+ "No Hardware SPI on (SCLK, MOSI, MISO)={}\nValid SPI ports:{}".
format((clock, MOSI, MISO), spiPorts))
def configure(self, baudrate=100000, polarity=0, phase=0, bits=8):
- if self._locked:
+ if board_name in ap_board.ANY_RASPBERRY_PI_2_OR_3:
+ from adafruit_blinka.microcontroller.bcm283x.pin import Pin
+ from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
+ elif board_name == ap_board.BEAGLEBONE_BLACK:
+ from adafruit_blinka.microcontroller.am335x.pin import Pin
+ from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
+ elif board_name == ap_board.ORANGEPI_PC:
+ from adafruit_blinka.microcontroller.allwinner_h3.pin import Pin
+ from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
+ else:
+ from machine import SPI as _SPI
from machine import Pin
- from microcontroller import spiPorts
+
+ if self._locked:
# TODO check if #init ignores MOSI=None rather than unsetting, to save _pinIds attribute
self._spi.init(
baudrate=baudrate,
polarity=polarity,
phase=phase,
bits=bits,
- firstbit=SPI.MSB,
- sck=Pin(self._pinIds[0]),
- mosi=Pin(self._pinIds[1]),
- miso=Pin(self._pinIds[2]))
+ firstbit=_SPI.MSB,
+ sck=Pin(self._pins[0].id),
+ mosi=Pin(self._pins[1].id),
+ miso=Pin(self._pins[2].id)
+ )
else:
raise RuntimeError("First call try_lock()")
self._spi = None
self._pinIds = None
- def write(self, buf):
- return self._spi.write(buf)
+ def write(self, buf, start=0, end=None):
+ return self._spi.write(buf, start, end)
- def readinto(self, buf):
- return self.readinto(buf)
+ def readinto(self, buf, start=0, end=None, write_value=0):
+ return self._spi.readinto(buf, start, end)
- def write_readinto(self, buffer_out, buffer_in):
- return self.write_readinto(buffer_out, buffer_in)
+ def write_readinto(self, buffer_out, buffer_in, out_start=0, out_end=None, in_start=0, in_end=None):
+ return self._spi.write_readinto(buffer_out, buffer_in, out_start, out_end, in_start, in_end)
class UART(Lockable):
Parity.ODD = Parity()
Parity.EVEN = Parity()
- # TODO investigate UART receiver_buffer_size as e.g. read_buf_len in https://github.com/micropython/micropython/blob/3eb0694b97c6a8f0e93b874549aac40d8b78b0e5/ports/stm32/uart.c
def __init__(self,
tx,
rx,
bits=8,
parity=None,
stop=1,
- timeout=None,
- receiver_buffer_size=None,
+ timeout=1000,
+ receiver_buffer_size=64,
flow=None):
- from microcontroller import uartPorts
- from machine import UART
+ from machine import UART as _UART
+ from microcontroller.pin import uartPorts
self.baudrate = baudrate
- if timeout is not None: # default 1000
- raise NotImplementedError(
- "Parameter '{}' unsupported on {}".format(
- "timeout", agnostic.board))
- if receiver_buffer_size is not None: # default 64
- raise NotImplementedError(
- "Parameter '{}' unsupported on {}".format(
- "receiver_buffer_size", agnostic.board))
if flow is not None: # default 0
raise NotImplementedError(
"Parameter '{}' unsupported on {}".format(
# check tx and rx have hardware support
for portId, portTx, portRx in uartPorts: #
- if portTx == tx.id and portRx == rx.id:
- self._uart = UART(
+ if portTx == tx and portRx == rx:
+ self._uart = _UART(
portId,
baudrate,
bits=bits,
parity=parity,
stop=stop,
- timeout=timeout)
+ timeout=timeout,
+ read_buf_len=receiver_buffer_size
+ )
break
else:
raise NotImplementedError(
projects / Adafruit_Blinka-hackapet.git / blobdiff