SPI.md

SPI (Serial Peripheral Interface)

The W80x controller family has one high-speed SPI interface with frequency up to 20 MHz. SPI bus is supported by the SPI library in master mode.

Default SPI pins for W806, W801 and Air103 boards are:

#define PIN_SPI_SCK   PB15
#define PIN_SPI_MISO  PB16
#define PIN_SPI_MOSI  PB17

Alternative pinouts can be set by using the following method:

SPI.setSPIpins(uint8_t mosi, uint8_t miso, uint8_t sck);

Valid SPI pins should be as follows:

Hardware SPI pins table

SPI signal	Default pins	Alternative pins
SCK	PB15	PB1, PB2, PB24
MISO	PB16	PB0, PB3, PB25
MOSI	PB17	PA7, PB5, PB26
SS	PB14	PA0, PB4, PB23

The function returns true after success pin remap and false otherwise. Note that you need call SPI.begin() before any SPI operation after changing the pins.

Hardware and software CS select

Note that the CS pin can be hardware or software controlled by the sketch. The library uses software CS control by default. To change this you need call SPI.setHardCS(uint8_t cs) with one of predefined CS pins above. To switch hardware CS off, use the call SPI.useSoftCS().

Using interrupts

The current library does not supports the interrupt calls usingInterrupt, notUsingInterrupt, attachInterrupt, and detachInterrpt.

Documentation

For a detailed overview of the basic SPI interface methods see the Arduino SPI documentation.