Function mraa_sys::mraa_spi_write_buf

pub unsafe extern "C" fn mraa_spi_write_buf(
    dev: mraa_spi_context, 
    data: *mut u8, 
    length: c_int
) -> *mut u8

Write Buffer of bytes to the SPI device. The pointer return has to be free'd by the caller. It will return a NULL pointer in cases of error.

@param dev The Spi context @param data to send @param length elements within buffer, Max 4096 @return Data received on the miso line, same length as passed in