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cpu/stm32/periph_pwm: add doc for complementary timer channels

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This commit is contained in:
Gunar Schorcht 2023-05-19 01:07:42 +02:00
parent 62210303ab
commit d8cf5a0c66
1 changed files with 12 additions and 1 deletions
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13
cpu/stm32/include/periph/cpu_pwm.h
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@ -33,10 +33,21 @@ extern "C" {
/** /**
* @brief PWM channel * @brief PWM channel
*
* When using a general-purpose timer for a PWM device, the outputs OC<n> of
* each of the four capture/compare channels can be used as PWM channel.
* The respective capture/compare channel is then specified with 0...3 in
* `cc_chan` for the outputs OC1...OC4.
*
* Advanced timers like TIM1 and TIM8 have additionally three complementary
* outputs OC<n>N of the capture/compare channels, which can also be used
* as PWM channels. These complementary outputs are defined with an offset
* of 4, i.e. they are specified in `cc_chan` with 4...6 for OC1N...OC3N.
*/ */
typedef struct { typedef struct {
gpio_t pin; /**< GPIO pin mapped to this channel */ gpio_t pin; /**< GPIO pin mapped to this channel */
uint8_t cc_chan; /**< capture compare channel used */ uint8_t cc_chan; /**< Capture/compare channel used: 0..3 for OC1..OC4
or 4..6 for OC1N..OC3N for advanced timers */
} pwm_chan_t; } pwm_chan_t;
/** /**