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drivers: pwm: pwm_stm32: Add 6-PWM support

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User can use 6-PWM motor driver in dts like this below:
```dts
pwms =
 // ch1,ch2,ch3,ch1n,ch2n,ch3n
 <&pwm 1 PWM_USEC(50) PWM_POLARITY_NORMAL>, // ch1
 <&pwm 2 PWM_USEC(50) PWM_POLARITY_NORMAL>, // ch2
 <&pwm 3 PWM_USEC(50) PWM_POLARITY_NORMAL>, // ch3
 <&pwm 1 PWM_USEC(50) (PWM_POLARITY_NORMAL|STM32_PWM_COMPLEMENTARY)>,
 <&pwm 2 PWM_USEC(50) (PWM_POLARITY_NORMAL|STM32_PWM_COMPLEMENTARY)>,
 <&pwm 3 PWM_USEC(50) (PWM_POLARITY_NORMAL|STM32_PWM_COMPLEMENTARY)>;
```

Signed-off-by: Savent Gate <savent_gate@outlook.com>
This commit is contained in:
Savent Gate 2023-04-28 21:33:04 +08:00 committed by Fabio Baltieri
parent c54b71d3b0
commit e2c39313ac
1 changed files with 25 additions and 2 deletions
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27
drivers/pwm/pwm_stm32.c
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@ -242,6 +242,7 @@ static int pwm_stm32_set_cycles(const struct device *dev, uint32_t channel,
uint32_t ll_channel;
uint32_t current_ll_channel; /* complementary output if used */
uint32_t negative_ll_channel;
if (channel < 1u || channel > TIMER_MAX_CH) {
LOG_ERR("Invalid channel (%d)", channel);
@ -269,16 +270,22 @@ static int pwm_stm32_set_cycles(const struct device *dev, uint32_t channel,
ll_channel = ch2ll[channel - 1u];
if (channel <= ARRAY_SIZE(ch2ll_n)) {
negative_ll_channel = ch2ll_n[channel - 1u];
} else {
negative_ll_channel = 0;
}
/* in LL_TIM_CC_DisableChannel and LL_TIM_CC_IsEnabledChannel,
* the channel param could be the complementary one
*/
if ((flags & STM32_PWM_COMPLEMENTARY_MASK) == STM32_PWM_COMPLEMENTARY) {
if (channel > ARRAY_SIZE(ch2ll_n)) {
if (!negative_ll_channel) {
/* setting a flag on a channel that has not this capability */
LOG_ERR("Channel %d has NO complementary output", channel);
return -EINVAL;
}
current_ll_channel = ch2ll_n[channel - 1u];
current_ll_channel = negative_ll_channel;
} else {
current_ll_channel = ll_channel;
}
@ -315,9 +322,25 @@ static int pwm_stm32_set_cycles(const struct device *dev, uint32_t channel,
if ((flags & STM32_PWM_COMPLEMENTARY_MASK) == STM32_PWM_COMPLEMENTARY) {
oc_init.OCNState = LL_TIM_OCSTATE_ENABLE;
oc_init.OCNPolarity = get_polarity(flags);
/* inherit the polarity of the positive output */
oc_init.OCState = LL_TIM_CC_IsEnabledChannel(cfg->timer, ll_channel)
? LL_TIM_OCSTATE_ENABLE
: LL_TIM_OCSTATE_DISABLE;
oc_init.OCPolarity = LL_TIM_OC_GetPolarity(cfg->timer, ll_channel);
} else {
oc_init.OCState = LL_TIM_OCSTATE_ENABLE;
oc_init.OCPolarity = get_polarity(flags);
/* inherit the polarity of the negative output */
if (negative_ll_channel) {
oc_init.OCNState =
LL_TIM_CC_IsEnabledChannel(cfg->timer, negative_ll_channel)
? LL_TIM_OCSTATE_ENABLE
: LL_TIM_OCSTATE_DISABLE;
oc_init.OCNPolarity =
LL_TIM_OC_GetPolarity(cfg->timer, negative_ll_channel);
}
}
#else /* LL_TIM_CHANNEL_CH1N */