Package com.diozero.api

Class SpiDevice

java.lang.Object
com.diozero.api.SpiDevice
All Implemented Interfaces:
SPIConstants, java.io.Closeable, java.lang.AutoCloseable
public class SpiDevice
extends java.lang.Object
implements java.io.Closeable, SPIConstants
https://www.raspberrypi.org/documentation/hardware/raspberrypi/spi/README.md For modern Raspberry Pis: 2 SPI controllers, 0 (SPI-0) and 1 (SPI-1) Controller 0 has 2 channels (CE-0 on physical pin 24, CE-1 on physical pin 26) Controller 1 has 3 channels (CE-0 on physical pin 12, CE-1 on physical pin 11, CE-2 on physical pin 36) SPI-1 is more limited that SPI-0 on the Raspberry Pi (https://www.raspberrypi.org/forums/viewtopic.php?t=81903&p=579154) - The SPI-1 clock is derived from the system clock therefore you have to be careful when over/underclocking to set the right divisor - Limited IRQ support, no thresholding on the FIFO except "TX empty" or "done". - No DMA support (no peripheral DREQ) On a RPi 3 you have to change the GPU core frequency to 250 MHz, otherwise the SPI clock has the wrong frequency. Do this by adding the following line to /boot/config.txt and reboot. core_freq=250