diff options
| -rw-r--r-- | docs/audio_driver.md | 5 | ||||
| -rw-r--r-- | platforms/chibios/drivers/audio_pwm_hardware.c | 8 |
2 files changed, 12 insertions, 1 deletions
diff --git a/docs/audio_driver.md b/docs/audio_driver.md index 7bce6c2d9b..03c0a824df 100644 --- a/docs/audio_driver.md +++ b/docs/audio_driver.md @@ -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 diff --git a/platforms/chibios/drivers/audio_pwm_hardware.c b/platforms/chibios/drivers/audio_pwm_hardware.c index 40d891326f..21b5c6892c 100644 --- a/platforms/chibios/drivers/audio_pwm_hardware.c +++ b/platforms/chibios/drivers/audio_pwm_hardware.c @@ -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; |