Hey Bill,
I am running a Ubuntu 14.04 image, and /lib/firmware looks like it comes
from the Bizarro universe. no 'bone' or 'pwm' files at all.
The only thing remotely familiar is am335x-pm-firmware.bin. The sample
code I tried to run referred to ocp.2. I got some of the digital GPIO pins
talking,
but I couldn't get analog input working on 14.04.
Code where working:
int main()
{
FILE *io,*iodir,*ioval;
io = fopen("/sys/class/gpio/export", "w");
fseek(io,0,SEEK_SET);
fprintf(io,"%d",45);
fflush(io);
iodir = fopen("/sys/class/gpio/gpio45/direction", "w");
fseek(iodir,0,SEEK_SET);
fprintf(iodir,"out");
fflush(iodir);
Code not Working:
FILE *pwm,*duty,*period,*run;
pwm = fopen("/sys/devices/bone_capemgr.9/slots", "w");
fseek(pwm,0,SEEK_SET);
fprintf(pwm,"am33xx_pwm");
fflush(pwm);
fprintf(pwm,"bone_pwm_P8_13");
fflush(pwm);
period = fopen("/sys/devices/ocp.2/pwm_test_P8_13.14/period", "w");
fseek(period,0,SEEK_SET);
fprintf(period,"%d",200000000);
fflush(period);
Easy to figure out why it fails - no ocp.2 files, and nothing in ocp.3
similar.
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