Function mynewt::hw::hal::hal_spi_slave_set_def_tx_val

pub unsafe extern "C" fn hal_spi_slave_set_def_tx_val(
    spi_num: c_int, 
    val: u16
) -> c_int

Sets the default value transferred by the slave. Not valid for master

• spi_num: SPI interface to use

Return: int 0 on success, non-zero error code on failure.