#include "utility/template/spi.h" void cirque_pinnacle_arduino_wrappers::SPIClass::transfer(void *buf, uint32_t len); Transfer a buffer of bytes to a SPI slave device. Parameters¶ void *buf¶The pointer to a buffer of bytes to send over MOSI. uint32_t len¶The length of the buf in bytes. Note The bytes received over MISO will replace the contents of buf as the bytes are sent over MOSI.