55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
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#include <furi_hal_speaker.h>
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#include <furi_hal_gpio.h>
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#include <furi_hal_resources.h>
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#include <stm32wbxx_ll_tim.h>
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#define FURI_HAL_SPEAKER_TIMER TIM16
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#define FURI_HAL_SPEAKER_CHANNEL LL_TIM_CHANNEL_CH1
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#define FURI_HAL_SPEAKER_PRESCALER 500
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#define FURI_HAL_SPEAKER_MAX_VOLUME 60
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// #define FURI_HAL_SPEAKER_NEW_VOLUME
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void furi_hal_speaker_init() {
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LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_TIM16);
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LL_TIM_DeInit(FURI_HAL_SPEAKER_TIMER);
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hal_gpio_init_ex(
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&gpio_speaker, GpioModeAltFunctionPushPull, GpioPullNo, GpioSpeedLow, GpioAltFn14TIM16);
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}
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void furi_hal_speaker_start(float frequency, float volume) {
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if(volume < 0) volume = 0;
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if(volume > 1) volume = 1;
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volume = volume * volume * volume;
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LL_TIM_InitTypeDef TIM_InitStruct = {0};
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TIM_InitStruct.Prescaler = FURI_HAL_SPEAKER_PRESCALER - 1;
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TIM_InitStruct.Autoreload = ((SystemCoreClock / FURI_HAL_SPEAKER_PRESCALER) / frequency) - 1;
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LL_TIM_Init(FURI_HAL_SPEAKER_TIMER, &TIM_InitStruct);
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#ifdef FURI_HAL_SPEAKER_NEW_VOLUME
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uint16_t compare_value = volume * FURI_HAL_SPEAKER_MAX_VOLUME;
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uint16_t clip_value = volume * TIM_InitStruct.Autoreload / 2;
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if(compare_value > clip_value) {
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compare_value = clip_value;
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}
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#else
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uint16_t compare_value = volume * TIM_InitStruct.Autoreload / 2;
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#endif
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LL_TIM_OC_InitTypeDef TIM_OC_InitStruct = {0};
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TIM_OC_InitStruct.OCMode = LL_TIM_OCMODE_PWM1;
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TIM_OC_InitStruct.OCState = LL_TIM_OCSTATE_ENABLE;
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TIM_OC_InitStruct.CompareValue = compare_value;
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LL_TIM_OC_Init(FURI_HAL_SPEAKER_TIMER, FURI_HAL_SPEAKER_CHANNEL, &TIM_OC_InitStruct);
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LL_TIM_EnableAllOutputs(FURI_HAL_SPEAKER_TIMER);
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LL_TIM_EnableCounter(FURI_HAL_SPEAKER_TIMER);
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}
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void furi_hal_speaker_stop() {
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LL_TIM_CC_DisableChannel(FURI_HAL_SPEAKER_TIMER, FURI_HAL_SPEAKER_CHANNEL);
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LL_TIM_DisableCounter(FURI_HAL_SPEAKER_TIMER);
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}
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