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[Audio] Enable Complementary output for PWM Hardware driver (#22726)

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Co-authored-by: Joel Challis <git@zvecr.com>
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Drashna Jaelre 2023-12-21 19:38:59 -08:00 committed by GitHub
parent 9069c4540f
commit 29f8fa35cf
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2 changed files with 12 additions and 1 deletions
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5
docs/audio_driver.md
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@ -199,6 +199,11 @@ with all this information, the configuration would contain these lines:
ChibiOS uses GPIOv1 for the F103, which only knows of one alternate function.
On 'larger' STM32s, GPIOv2 or GPIOv3 are used; with them it is also necessary to configure `AUDIO_PWM_PAL_MODE` to the correct alternate function for the selected pin, timer and timer-channel.
You can also use the Complementary output (`TIMx_CHyN`) for PWM on supported controllers. To enable this functionality, you will need to make the following changes:
```c
// config.h:
#define AUDIO_PWM_COMPLEMENTARY_OUTPUT
```
### PWM software :id=pwm-software

8
platforms/chibios/drivers/audio_pwm_hardware.c
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@ -22,6 +22,12 @@
# define AUDIO_PWM_COUNTER_FREQUENCY 100000
#endif
#ifndef AUDIO_PWM_COMPLEMENTARY_OUTPUT
# define AUDIO_PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_HIGH
#else
# define AUDIO_PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH
#endif
extern bool playing_note;
extern bool playing_melody;
extern uint8_t note_timbre;
@ -29,7 +35,7 @@ extern uint8_t note_timbre;
static PWMConfig pwmCFG = {.frequency = AUDIO_PWM_COUNTER_FREQUENCY, /* PWM clock frequency */
.period = 2,
.callback = NULL,
.channels = {[(AUDIO_PWM_CHANNEL - 1)] = {.mode = PWM_OUTPUT_ACTIVE_HIGH, .callback = NULL}}};
.channels = {[(AUDIO_PWM_CHANNEL - 1)] = {.mode = AUDIO_PWM_OUTPUT_MODE, .callback = NULL}}};
static float channel_1_frequency = 0.0f;