Function soapysdr_sys::SoapySDRDevice_transactSPI

pub unsafe extern "C" fn SoapySDRDevice_transactSPI(
    device: *mut SoapySDRDevice,
    addr: c_int,
    data: c_uint,
    numBits: usize
) -> c_uint

Perform a SPI transaction and return the result. Its up to the implementation to set the clock rate, and read edge, and the write edge of the SPI core. SPI slaves without a readback pin will return 0.

If the device contains multiple SPI masters, the address bits can encode which master.

\param device a pointer to a device instance \param addr an address of an available SPI slave \param data the SPI data, numBits-1 is first out \param numBits the number of bits to clock out \return the readback data, numBits-1 is first in