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fix low duty crash + comments

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This commit is contained in:
lilian 2017-11-28 13:27:40 +01:00
parent 4fdf2e2857
commit 71807e74dd
2 changed files with 10 additions and 0 deletions
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8
extras/pwm/pwm.c
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@ -127,6 +127,7 @@ void pwm_set_freq(uint16_t freq)
pwmInfo._maxLoad = timer_get_load(FRC1); pwmInfo._maxLoad = timer_get_load(FRC1);
pwmInfo.freq = freq; pwmInfo.freq = freq;
debug("Frequency set at %u",pwmInfo.freq); debug("Frequency set at %u",pwmInfo.freq);
debug("MaxLoad is %u",pwmInfo._maxLoad);
} }
if (pwmInfo.running) if (pwmInfo.running)
@ -161,6 +162,13 @@ void pwm_start()
pwmInfo._offLoad = pwmInfo._maxLoad - pwmInfo._onLoad; pwmInfo._offLoad = pwmInfo._maxLoad - pwmInfo._onLoad;
pwmInfo._step = PERIOD_ON; pwmInfo._step = PERIOD_ON;
if(!pwmInfo._onLoad)
{
debug("Can't set timer with low duty and frequency settings, put duty at 0");
pwmInfo.dutyCycle = 0;
}
// 0% and 100% duty cycle are special cases: constant output.
if (pwmInfo.dutyCycle > 0 && pwmInfo.dutyCycle < UINT16_MAX) if (pwmInfo.dutyCycle > 0 && pwmInfo.dutyCycle < UINT16_MAX)
{ {
// Trigger ON // Trigger ON

2
extras/pwm/pwm.h
View file

@ -16,6 +16,8 @@
extern "C" { extern "C" {
#endif #endif
//Warning: Printf disturb pwm, use uart_putc instead.
void pwm_init(uint8_t npins, const uint8_t* pins, uint8_t reverse); void pwm_init(uint8_t npins, const uint8_t* pins, uint8_t reverse);
void pwm_set_freq(uint16_t freq); void pwm_set_freq(uint16_t freq);
void pwm_set_duty(uint16_t duty); void pwm_set_duty(uint16_t duty);