[Audio] Enable Complementary output for PWM Hardware driver (#22726)
Co-authored-by: Joel Challis <git@zvecr.com>master
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@ -199,6 +199,11 @@ with all this information, the configuration would contain these lines:
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ChibiOS uses GPIOv1 for the F103, which only knows of one alternate function.
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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.
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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:
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```c
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// config.h:
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#define AUDIO_PWM_COMPLEMENTARY_OUTPUT
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```
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### PWM software :id=pwm-software
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@ -22,6 +22,12 @@
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# define AUDIO_PWM_COUNTER_FREQUENCY 100000
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#endif
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#ifndef AUDIO_PWM_COMPLEMENTARY_OUTPUT
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# define AUDIO_PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_HIGH
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#else
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# define AUDIO_PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH
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#endif
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extern bool playing_note;
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extern bool playing_melody;
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extern uint8_t note_timbre;
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@ -29,7 +35,7 @@ extern uint8_t note_timbre;
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static PWMConfig pwmCFG = {.frequency = AUDIO_PWM_COUNTER_FREQUENCY, /* PWM clock frequency */
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.period = 2,
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.callback = NULL,
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.channels = {[(AUDIO_PWM_CHANNEL - 1)] = {.mode = PWM_OUTPUT_ACTIVE_HIGH, .callback = NULL}}};
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.channels = {[(AUDIO_PWM_CHANNEL - 1)] = {.mode = AUDIO_PWM_OUTPUT_MODE, .callback = NULL}}};
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static float channel_1_frequency = 0.0f;
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