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32x: a hack for dealing with pwm inaccuracy

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This commit is contained in:
notaz 2013-07-09 03:05:02 +03:00
parent 6a98f03eef
commit bc3aea8e70
1 changed files with 9 additions and 4 deletions
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13
pico/32x/pwm.c
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@ -52,10 +52,15 @@ void p32x_timers_do(unsigned int cycles)
cycles *= 3;
pwm_cycle_counter += cycles;
while (pwm_cycle_counter > pwm_cycles) {
pwm_cycle_counter -= pwm_cycles;
pwm_smp_expect++;
// since we run things in async fashion, allow pwm to lag behind
// but don't allow our "queue" to be infinite
cnt = pwm_smp_expect - pwm_smp_cnt;
if (cnt <= 0 || cnt * pwm_cycles < OSC_NTSC/7*3 / 60 / 2) {
pwm_cycle_counter += cycles;
while (pwm_cycle_counter > pwm_cycles) {
pwm_cycle_counter -= pwm_cycles;
pwm_smp_expect++;
}
}
// WDT timers