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spi mode error
Added by Brian Wentworth about 7 years ago
I'm trying to uses the hps spi controller and am getting an error trying to set the spi mode. I'm using spidev and when I run this code:
ret = ioctl(fd, SPI_IOC_WR_MODE, SPI_MODE_1);
if (ret == -1)
pabort("can't get spi mode");and I get this error:
can't get spi mode: Bad address
Aborted
Any idea on this?
Thanks,
Brian
Replies (5)
RE: spi mode error - Added by Brian Wentworth about 7 years ago
I have not been able to get this to work. Does anyone have any idea why this is happening?
Thanks,
Brian
RE: spi mode error - Added by Michael Williamson about 7 years ago
Is your file descriptor, fd, valid?
RE: spi mode error - Added by Brian Wentworth about 7 years ago
Yes I can send and receive using : ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
but only in spi mode 0x0. If I try and set the spi mode using the command above I get the pavort error.
RE: spi mode error - Added by Michael Williamson about 7 years ago
I think the SPI_IOC_WR_MODE is looking for the argument to be an address pointer (char*) pointing to the SPI_MODE_1 value.
Can you try:
char mode = SPI_MODE_1; ret = ioctl(fd, SPI_IOC_WR_MODE, &mode);
that would account for the bad address error code....
RE: spi mode error - Added by Brian Wentworth about 7 years ago
This solved the error but there is no change to the spi mode.
