Use of SPI

For details about SPI, please refer to SPI-API Document.

Instructions

Host Mode

  • Import SPI module from machine
from machine import SPI
  • The pins used for configuration are chip select GPIO function and SPI function.
fm.register(25,fm.fpioa.GPIOHS10, force=True)#cs
cs = GPIO(GPIO.GPIOHS10, GPIO.OUT)

fm.register(28,fm.fpioa.SPI1_D0, force=True)#mosi
fm.register(26,fm.fpioa.SPI1_D1, force=True)#miso
fm.register(27,fm.fpioa.SPI1_SCLK, force=True)#sclk
  • Create SPI object
spi1 = SPI(SPI.SPI1, mode=SPI.MODE_MASTER, baudrate=10000000, polarity=0, phase=0, bits=8, firstbit=SPI.MSB)
  • Use chip select GPIO to select the slave, read and write data through SPI
cs.value(0)
spi1.write_readinto(w, r)
cs.value(1)

Slave mode

K210 SPI slave mode only supports three-wire communication, so this mode is not implemented in MaixPy. For slave mode, please refer to SPI_SLAVE C SDK implementation.

Example

  • Select the chip select GPIO corresponding to the slave and send and receive data
from machine import SPI
from fpioa_manager import fm
from Maix import GPIO

m.register(25,fm.fpioa.GPIOHS10, force=True)#cs
cs = GPIO(GPIO.GPIOHS10, GPIO.OUT)

fm.register(28,fm.fpioa.SPI1_D0, force=True)#mosi
fm.register(26,fm.fpioa.SPI1_D1, force=True)#miso
fm.register(27,fm.fpioa.SPI1_SCLK, force=True)#sclk

spi1 = SPI(SPI.SPI1, mode=SPI.MODE_MASTER, baudrate=10000000, polarity=0, phase=0, bits=8, firstbit=SPI.MSB)

w = b'\xFF'
r = bytearray(1)

cs.value(0)
print(spi1.write_readinto(w, r))
cs.value(1)