The SPI module gets a clock of 48 MHz from the clock tree. You might be
able to work with that frequency, but I know you can get it to work at
48/3 (16 MHz), because I do every day. I have read somewhere
experimenters could not get it to work at 48/2 (24 MHz). I set my speed
on the fly using an ioctl call in my c program:
ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
if (ret == -1)
pabort("can't get max speed hz");
On 7/16/2014 7:45 AM, Ardit Cuka wrote:
Hi, I am trying to find out what is the maximum frequencyon P9_22
which is the SPI clock on BBB. AND HOW DO I CHANGE THIS FREQUENCY.
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