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| author | Damien George <damien.p.george@gmail.com> | 2014-08-02 12:51:18 +0100 |
|---|---|---|
| committer | Damien George <damien.p.george@gmail.com> | 2014-08-02 12:51:18 +0100 |
| commit | 71bed1a9a7a0a042d3e0964f06cee900f6d7d9ae (patch) | |
| tree | 458475dbc943d6305128917e2fff71d15a9c8df5 | |
| parent | 8464be15ed7001edad55f911177ca70f0175d4ca (diff) | |
| download | micropython-71bed1a9a7a0a042d3e0964f06cee900f6d7d9ae.tar.gz micropython-71bed1a9a7a0a042d3e0964f06cee900f6d7d9ae.zip | |
stmhal: Add preliminary driver for ST32F4DISC accelerometer.
Written in Python, not currently working. See issue #725.
| -rw-r--r-- | stmhal/boards/STM32F4DISC/staccel.py | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/stmhal/boards/STM32F4DISC/staccel.py b/stmhal/boards/STM32F4DISC/staccel.py new file mode 100644 index 0000000000..af842ebcf6 --- /dev/null +++ b/stmhal/boards/STM32F4DISC/staccel.py @@ -0,0 +1,56 @@ +""" +Driver for accelerometer on STM32F4 Discover board. + +Assumes it's a LIS302DL MEMS device. + +Not currently working. + +See: + STM32Cube_FW_F4_V1.1.0/Drivers/BSP/Components/lis302dl/lis302dl.h + STM32Cube_FW_F4_V1.1.0/Drivers/BSP/Components/lis302dl/lis302dl.c + STM32Cube_FW_F4_V1.1.0/Drivers/BSP/STM32F4-Discovery/stm32f4_discovery.c + STM32Cube_FW_F4_V1.1.0/Drivers/BSP/STM32F4-Discovery/stm32f4_discovery.h + STM32Cube_FW_F4_V1.1.0/Drivers/BSP/STM32F4-Discovery/stm32f4_discovery_accelerometer.c + STM32Cube_FW_F4_V1.1.0/Drivers/BSP/STM32F4-Discovery/stm32f4_discovery_accelerometer.h + STM32Cube_FW_F4_V1.1.0/Projects/STM32F4-Discovery/Demonstrations/Src/main.c +""" + +from pyb import Pin +from pyb import SPI + +READWRITE_CMD = const(0x80) +MULTIPLEBYTE_CMD = const(0x40) +LIS302DL_WHO_AM_I_ADDR = const(0x0f) +LIS302DL_CTRL_REG1_ADDR = const(0x20) + +class STAccel: + def __init__(self): + self.cs_pin = Pin('PE3', Pin.OUT_PP, Pin.PULL_NONE) + self.cs_pin.high() + self.spi = SPI(1, SPI.MASTER, baudrate=328125, polarity=0, phase=1, bits=8) + + def rd(self, addr, nbytes): + if nbytes > 1: + addr |= READWRITE_CMD | MULTIPLEBYTE_CMD + else: + addr |= READWRITE_CMD + self.cs_pin.low() + self.spi.send(addr) + buf = self.spi.send_recv(bytearray(nbytes * [0])) # read data, MSB first + self.cs_pin.high() + return buf + + def wr(self, addr, buf): + if len(buf) > 1: + addr |= MULTIPLEBYTE_CMD + self.cs_pin.low() + self.spi.send(addr) + for b in buf: + self.spi.send(b) + self.cs_pin.high() + + def read_id(self): + return self.rd(LIS302DL_WHO_AM_I_ADDR, 1) + + def init(self, init_param): + self.wr(LIS302DL_CTRL_REG1_ADDR, bytearray([init_param])) |