Cette page est inspirée de penguintutor.com Using Raspberry Pi and Arduino together through SPI serial communications

import spidev
 
spi_bus = 0
spi_device = 0
 
spi = spidev.SpiDev()
spi.open(spi_bus, spi_device)
spi.max_speed_hz = 1000000
 
# This is based on using SPI Bus 0 (the pin numbers mentioned previously) and device 0 (CE0). The following code shows the transfer of two bytes from the Raspberry Pi to the Arduino.
# Send a null byte to check for value
 
send_byte = 0x80
rcv_byte = spi.xfer2([send_byte])
 
# repeat to check for a response
rcv_byte = spi.xfer2([send_byte])
data_recv = rcv_byte[0]
 
if (data_recv != 0x80):
    print ("Unable to communicate with Arduino "+str(data_recv))
    quit()

# include SPI.h
 
void setup() 
{
  // Set the Main in Secondary Out as an output
  pinMode(MISO, OUTPUT);
  // turn on SPI as a secondary
  // Set appropriate bit in SPI Control Register
  SPCR |= _BV(SPE);
}
 
// The following code is then used to receive a byte and then set the data register to return a byte to the master controller device.
void loop () 
{
  byte in_byte;
  // SPIF indicates transmission complete (byte received)
  if ((SPSR & (1 << SPIF)) != 0)
  {
    in_byte = SPDR;
    // Handle the input code here
    // Set return_val to the value you want to return
    SPDR = return_val;
  }