MQX Software SolutionsのトピックRe: 32-bit SPI framesize problem CW10.2 MQX 3.8

32-bit SPI framesize problem CW10.2 MQX 3.8

cavebiker — Sat, 01 Sep 2012 00:51:12 GMT

When I set the SPI framesize to 32-bit throught the MQX SPI driver, it gets set to 16-bits.

Here is the code:

param = 32; /* Set framesize to 32 bits for QLX SPI Slave*/
printf("Setting framesize to %d for QLX SPI Slave", param);
if (SPI_OK == ioctl(spi2File, IO_IOCTL_SPI_SET_FRAMESIZE, &param)) {
printf("OK\n");
} else {
printf("ERROR\n");
}

printf("Getting framesize ... "); /* Get transfer mode */
if (SPI_OK == ioctl(spi2File, IO_IOCTL_SPI_GET_FRAMESIZE, &param)) {
printf("%d\n", param);
} else {
printf("ERROR\n");
}

The result is this: Getting framesize ... 16

It should be 32.

Has anyone seen this and is there a work around?

Cheers,

Tom

Re: 32-bit SPI framesize problem CW10.2 MQX 3.8

drummer — Sat, 01 Sep 2012 03:42:16 GMT

Is param a 32 bit integer type?

Re: 32-bit SPI framesize problem CW10.2 MQX 3.8

cavebiker — Sat, 01 Sep 2012 04:31:34 GMT

Yes

uint_32 param;

Re: 32-bit SPI framesize problem CW10.2 MQX 3.8

MarkP_ — Sun, 02 Sep 2012 13:23:31 GMT

Hi,

The value is set to CTAR FMSZ bits:

case IO_IOCTL_SPI_SET_FRAMESIZE:

...

dspi_ptr->CTAR[0] &= (~ (DSPI_CTAR_FMSZ(0x0F)));

dspi_ptr->CTAR[0] |= DSPI_CTAR_FMSZ(*param_ptr - 1);

There are only four bits for the value, so the max. value is 0x0f +1.

~Mark