Anyone know why the cs_change member of the spi_ioc_transfer struct doesn't
do anything? I've tried setting it to 1 and 0, but neither value changes
the behavior. CS always goes back high after ioctl returns. Here is my code:
static int8_t spiTransfer(const uint8_t* const send, uint8_t* const receive,
uint16_t length, bool deAssertCS) {
struct spi_ioc_transfer transfer; //the transfer structure
transfer.tx_buf = (unsigned long) send; //the buffer for sending data
transfer.rx_buf = (unsigned long) receive; //the buffer for receiving data
transfer.len = length; //the length of buffer
transfer.speed_hz = speed; //the speed in Hz
transfer.bits_per_word = bits; //bits per word
transfer.delay_usecs = 0; //delay in us
transfer.cs_change = deAssertCS;
int8_t status = ioctl(fd, SPI_IOC_MESSAGE(1), &transfer);
if (status < 0) {
perror("SPI: SPI_IOC_MESSAGE failed");
}
return status;
}
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