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In case of SAMV7 it is possible to overwrite the pwm output with 0 or 1 immediately. Changing the dutycycle to 0 or 100 will take effect only on end of cycle, which could be to late for some applications.

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This solution adds a overwrite flag and value when updating the duty cycle.
This commit is contained in:
Simon Filgis 2022-11-15 20:41:25 +01:00 committed by Xiang Xiao
parent 9b55168462
commit 6376d90c3d
2 changed files with 22 additions and 0 deletions
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18
arch/arm/src/samv7/sam_pwm.c
View File

@ -449,6 +449,7 @@ static int pwm_start(struct pwm_lowerhalf_s *dev,
const struct pwm_info_s *info)
{
struct sam_pwm_s *priv = (struct sam_pwm_s *)dev;
uint32_t regval;
#ifdef CONFIG_PWM_MULTICHAN
for (int i = 0; i < PWM_NCHANNELS; i++)
@ -472,6 +473,23 @@ static int pwm_start(struct pwm_lowerhalf_s *dev,
info->frequency);
pwm_set_output(dev, priv->channels[index - 1].channel,
info->channels[i].duty);
if (info->channels[i].ch_outp_ovrwr)
{
regval = pwm_getreg(priv, SAMV7_PWM_OOV);
regval &= ~(info->channels[i].ch_outp_ovrwr_val
<< priv->channels[i].channel);
pwm_putreg(priv, SAMV7_PWM_OOV, regval);
regval = (1 << priv->channels[i].channel);
pwm_putreg(priv, SAMV7_PWM_OSS, regval);
}
else
{
/* release overwrite of channel */
regval = (1 << priv->channels[i].channel);
pwm_putreg(priv, SAMV7_PWM_OSC, regval);
}
}
}
#else

4
include/nuttx/timers/pwm.h
View File

@ -120,6 +120,10 @@
struct pwm_chan_s
{
ub16_t duty;
#ifdef CONFIG_SAMV7_PWM
bool ch_outp_ovrwr;
bool ch_outp_ovrwr_val;
#endif
int8_t channel;
};
#endif