Function mynewt::hw::hal::hal_spi_set_txrx_cb

pub unsafe extern "C" fn hal_spi_set_txrx_cb(
    spi_num: c_int, 
    txrx_cb: hal_spi_txrx_cb, 
    arg: *mut c_void
) -> c_int

Sets the txrx callback (executed at interrupt context) when the buffer is transferred by the master or the slave using the non-blocking API. Cannot be called when the spi is enabled. This callback will also be called when chip select is de-asserted on the slave.

NOTE: This callback is only used for the non-blocking interface and must be called prior to using the non-blocking API.

• spi_num: SPI interface on which to set callback
• txrx: Callback function
• arg: Argument to be passed to callback function

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