Momentum-Apps/dtmf_dolphin/dtmf_dolphin_hal.c

#include "dtmf_dolphin_hal.h"

void dtmf_dolphin_speaker_init() {
    LL_TIM_InitTypeDef TIM_InitStruct = {0};
    TIM_InitStruct.Prescaler = DTMF_DOLPHIN_HAL_DMA_PRESCALER;
    TIM_InitStruct.Autoreload = DTMF_DOLPHIN_HAL_DMA_AUTORELOAD;
    LL_TIM_Init(FURI_HAL_SPEAKER_TIMER, &TIM_InitStruct);

    LL_TIM_OC_InitTypeDef TIM_OC_InitStruct = {0};
    TIM_OC_InitStruct.OCMode = LL_TIM_OCMODE_PWM1;
    TIM_OC_InitStruct.OCState = LL_TIM_OCSTATE_ENABLE;
    TIM_OC_InitStruct.CompareValue = 127;
    LL_TIM_OC_Init(FURI_HAL_SPEAKER_TIMER, FURI_HAL_SPEAKER_CHANNEL, &TIM_OC_InitStruct);

    // Enable GPIO output
    // Enable bus
    furi_hal_bus_enable(FuriHalBusTIM2);

    //configuring PA6 pin as TIM16 output
    furi_hal_gpio_init_ex(
        &gpio_ext_pa6,
        GpioModeAltFunctionPushPull,
        GpioPullNo,
        GpioSpeedVeryHigh,
        GpioAltFn14TIM16);
}

void dtmf_dolphin_gpio_deinit() {
    // Disable GPIO output 
    furi_hal_gpio_init(&gpio_ext_pa6, GpioModeAnalog, GpioPullNo, GpioSpeedLow);
    furi_hal_bus_disable(FuriHalBusTIM2);
}

void dtmf_dolphin_speaker_start() {
    LL_TIM_EnableAllOutputs(FURI_HAL_SPEAKER_TIMER);
    LL_TIM_EnableCounter(FURI_HAL_SPEAKER_TIMER);
}

void dtmf_dolphin_speaker_stop() {
    LL_TIM_DisableAllOutputs(FURI_HAL_SPEAKER_TIMER);
    LL_TIM_DisableCounter(FURI_HAL_SPEAKER_TIMER);
}

void dtmf_dolphin_dma_init(uint32_t address, size_t size) {
    uint32_t dma_dst = (uint32_t)&(FURI_HAL_SPEAKER_TIMER->CCR1);

    LL_DMA_ConfigAddresses(DMA_INSTANCE, address, dma_dst, LL_DMA_DIRECTION_MEMORY_TO_PERIPH);
    LL_DMA_SetDataLength(DMA_INSTANCE, size);

    LL_DMA_SetPeriphRequest(DMA_INSTANCE, LL_DMAMUX_REQ_TIM16_UP);
    LL_DMA_SetDataTransferDirection(DMA_INSTANCE, LL_DMA_DIRECTION_MEMORY_TO_PERIPH);
    LL_DMA_SetChannelPriorityLevel(DMA_INSTANCE, LL_DMA_PRIORITY_VERYHIGH);
    LL_DMA_SetMode(DMA_INSTANCE, LL_DMA_MODE_CIRCULAR);
    LL_DMA_SetPeriphIncMode(DMA_INSTANCE, LL_DMA_PERIPH_NOINCREMENT);
    LL_DMA_SetMemoryIncMode(DMA_INSTANCE, LL_DMA_MEMORY_INCREMENT);
    LL_DMA_SetPeriphSize(DMA_INSTANCE, LL_DMA_PDATAALIGN_HALFWORD);
    LL_DMA_SetMemorySize(DMA_INSTANCE, LL_DMA_MDATAALIGN_HALFWORD);

    LL_DMA_EnableIT_TC(DMA_INSTANCE);
    LL_DMA_EnableIT_HT(DMA_INSTANCE);
}

void dtmf_dolphin_dma_start() {
    LL_DMA_EnableChannel(DMA_INSTANCE);
    LL_TIM_EnableDMAReq_UPDATE(FURI_HAL_SPEAKER_TIMER);
}

void dtmf_dolphin_dma_stop() {
    LL_DMA_DisableChannel(DMA_INSTANCE);
}