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commit 606b6d9310fb25c7d92c6f95bf61737e3c79fa0f Author: Michal Lenc <[email protected]> AuthorDate: Wed Aug 23 18:03:31 2023 +0200 samv7: add support for PWM polarity settings This commit adds function pwm_set_polarity() that setups channel polarity based on input info from application layer. Signed-off-by: Michal Lenc <[email protected]> --- arch/arm/src/samv7/sam_pwm.c | 41 +++++++++++++++++++++++++++++++++++++++-- 1 file changed, 39 insertions(+), 2 deletions(-) diff --git a/arch/arm/src/samv7/sam_pwm.c b/arch/arm/src/samv7/sam_pwm.c index cd08629fe9..f61492c21a 100644 --- a/arch/arm/src/samv7/sam_pwm.c +++ b/arch/arm/src/samv7/sam_pwm.c @@ -331,6 +331,8 @@ static void pwm_set_deadtime(struct pwm_lowerhalf_s *dev, uint8_t channel, ub16_t dead_time_a, ub16_t dead_time_b, ub16_t duty); #endif +static void pwm_set_polarity(struct pwm_lowerhalf_s *dev, uint8_t channel, + uint8_t cpol); /**************************************************************************** * Private Functions @@ -619,6 +621,38 @@ static void pwm_set_deadtime(struct pwm_lowerhalf_s *dev, uint8_t channel, } #endif +/**************************************************************************** + * Name: pwm_set_polarity + * + * Description: + * Set channel polarity + * + * Input Parameters: + * dev - A reference to the lower half PWM driver state structure + * channel - Channel to by updated + * cpol - Desired polarity + * + * Returned Value: + * None + * + ****************************************************************************/ + +static void pwm_set_polarity(struct pwm_lowerhalf_s *dev, uint8_t channel, + uint8_t cpol) +{ + struct sam_pwm_s *priv = (struct sam_pwm_s *)dev; + uint16_t regval; + + regval = pwm_getreg(priv, SAMV7_PWM_CMRX + (channel * CHANNEL_OFFSET)); + regval &= ~CMR_CPOL; + if (cpol == PWM_CPOL_HIGH) + { + regval |= CMR_CPOL; + } + + pwm_putreg(priv, SAMV7_PWM_CMRX + (channel * CHANNEL_OFFSET), regval); +} + /**************************************************************************** * Name: pwm_setup * @@ -670,7 +704,6 @@ static int pwm_setup(struct pwm_lowerhalf_s *dev) channel = priv->channels[i].channel; - regval = CMR_DPOLI; #ifdef CONFIG_PWM_DEADTIME regval |= CMR_DTE; #endif @@ -812,6 +845,8 @@ static int pwm_start(struct pwm_lowerhalf_s *dev, info->channels[i].dead_time_b, info->channels[i].duty); #endif + pwm_set_polarity(dev, priv->channels[index - 1].channel, + info->channels[i].cpol); pwm_set_output(dev, priv->channels[index - 1].channel, info->channels[i].duty); #ifdef CONFIG_PWM_OVERWRITE @@ -840,9 +875,11 @@ static int pwm_start(struct pwm_lowerhalf_s *dev, pwm_set_freq(dev, priv->channels[0].channel, info->frequency); #ifdef CONFIG_PWM_DEADTIME - pwm_set_deadtime(dev, priv->channels[index - 1].channel, + pwm_set_deadtime(dev, priv->channels[0].channel, info->dead_time_a, info->dead_time_b); #endif + pwm_set_polarity(dev, priv->channels[0].channel, + info->cpol); pwm_set_output(dev, priv->channels[0].channel, info->duty); #endif
