Is anyone else having issues with the cs_change member of the
spi_ioc_transfer struct no doing anything? I've tried setting it to both 1
and 0, but the behavior is always the same with CS being deasserted after
returning from ioctl. 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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