Hello,
I've read several posts on this forum where others are experiencing the same issue as I am having. Unfortunately, they are working with different versions of MQX and processor. I'm reying to use MQX 4.1 SPI IO driver on K70, to read a serial Flash part (Micron M25P20). I believe I have everything cpnfigured properly as I am seeing exactly what I expect on the SPI bus: Setting the WEL bit to the status register, then reading the status register. I expect 0x02, and this is what I'm seeing on the MISO line. /CS, SCLK, MOSI, and MISO timing and data look correct, however, the read buffer always report 0x00. I've tried _io_ioctl without success (following). Below is my actual read function. Any help would be great,
Regards,
Louie
/* Test simultaneous write and read to stat reg */
memset (send_buffer, 0, sizeof (send_buffer));
memset (recv_buffer, 0, sizeof (recv_buffer));
send_buffer[0] = SPI_MEMORY_READ_STATUS;
rw.BUFFER_LENGTH = 1;
rw.WRITE_BUFFER = (char *)send_buffer;
rw.READ_BUFFER = (char *)recv_buffer;
printf ("IO_IOCTL_SPI_READ_WRITE ... ");
if (SPI_OK == _io_ioctl (m_spifd, IO_IOCTL_SPI_READ_WRITE, &rw))
{
printf ("OK\n");
}
else
{
printf ("ERROR\n");
}
_io_fflush (m_spifd);
unsigned char SerialEEPROM::ReadStatus()
{
_mqx_int result;
uint8_t rxVal = 0xFF;
spiTxBuf = new unsigned char[SPI_TMP_BUF_SIZE];
spiRxBuf = new unsigned char[SPI_TMP_BUF_SIZE];
spiTxBuf[0] = STATUS_REG;
result = _io_write(m_spifd, spiTxBuf, 1);
result = _io_read(m_spifd, spiRxBuf, 1);
_io_fflush(m_spifd);
rxVal = spiRxBuf[0];
delete(spiTxBuf);
delete(spiRxBuf);
return rxVal;
}
