michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: pwm: mcux_ftm: add support for inverted polarity pwm signals

Browse source 
Add support for specifying the PWM signal polarity through flags to
the NXP Kinetis FlexTimer (FTM) PWM driver.

Prior to this change the FTM PWM driver always produced inverted
polarity (active-low) PWM signals.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
This commit is contained in:
Henrik Brix Andersen 2019-11-26 09:41:30 +01:00 • committed by Carles Cufí
commit e2346cf6a2
1 changed files with 11 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

19
drivers/pwm/pwm_mcux_ftm.c
View file

@ -52,16 +52,17 @@ static int mcux_ftm_pin_set(struct device *dev, u32_t pwm,
return -ENOTSUP;
}
if (flags) {
/* PWM polarity not supported (yet?) */
return -ENOTSUP;
}
duty_cycle = pulse_cycles * 100U / period_cycles;
data->channel[pwm].dutyCyclePercent = duty_cycle;
LOG_DBG("pulse_cycles=%d, period_cycles=%d, duty_cycle=%d",
pulse_cycles, period_cycles, duty_cycle);
if ((flags & PWM_POLARITY_INVERTED) == 0) {
data->channel[pwm].level = kFTM_HighTrue;
} else {
data->channel[pwm].level = kFTM_LowTrue;
}
LOG_DBG("pulse_cycles=%d, period_cycles=%d, duty_cycle=%d, flags=%d",
pulse_cycles, period_cycles, duty_cycle, flags);
if (period_cycles != data->period_cycles) {
u32_t pwm_freq;
@ -104,6 +105,8 @@ static int mcux_ftm_pin_set(struct device *dev, u32_t pwm,
} else {
FTM_UpdatePwmDutycycle(config->base, pwm, config->mode,
duty_cycle);
FTM_UpdateChnlEdgeLevelSelect(config->base, pwm,
data->channel[pwm].level);
FTM_SetSoftwareTrigger(config->base, true);
}
@ -149,7 +152,7 @@ static int mcux_ftm_init(struct device *dev)
for (i = 0; i < config->channel_count; i++) {
channel->chnlNumber = i;
channel->level = kFTM_LowTrue;
channel->level = kFTM_NoPwmSignal;
channel->dutyCyclePercent = 0;
channel->firstEdgeDelayPercent = 0;
channel++;