WhyCan Forum(哇酷开发者社区)

static void ADC_Config()
{
    // __IO uint32_t wait_loop_index = 0U;

    LL_ADC_InitTypeDef ADC_InitStruct = { 0 };
    LL_ADC_REG_InitTypeDef ADC_REG_InitStruct = { 0 };
    LL_GPIO_InitTypeDef GPIO_InitStruct = { 0 };

    // LL_RCC_SetADCClockSource(LL_RCC_ADC_CLKSOURCE_SYSCLK);
    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_ADC);

    // ADC1 GPIO Configuration PA3   ------> ADC1_IN3
    LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);
    GPIO_InitStruct.Pin = LL_GPIO_PIN_3;
    GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;
    GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
    LL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    ADC_InitStruct.Clock = LL_ADC_CLOCK_SYNC_PCLK_DIV2;
    ADC_InitStruct.Resolution = LL_ADC_RESOLUTION_12B;
    ADC_InitStruct.DataAlignment = LL_ADC_DATA_ALIGN_RIGHT;
    ADC_InitStruct.LowPowerMode = LL_ADC_LP_MODE_NONE;
    LL_ADC_Init(ADC1, &ADC_InitStruct);
    LL_ADC_REG_SetSequencerConfigurable(ADC1, LL_ADC_REG_SEQ_CONFIGURABLE);

    /* Poll for ADC channel configuration ready */
    while (LL_ADC_IsActiveFlag_CCRDY(ADC1) == 0) { }
    LL_ADC_ClearFlag_CCRDY(ADC1);

    ADC_REG_InitStruct.TriggerSource = LL_ADC_REG_TRIG_SOFTWARE;
    ADC_REG_InitStruct.SequencerLength = LL_ADC_REG_SEQ_SCAN_DISABLE;
    ADC_REG_InitStruct.SequencerDiscont = LL_ADC_REG_SEQ_DISCONT_DISABLE;
    ADC_REG_InitStruct.ContinuousMode = LL_ADC_REG_CONV_SINGLE;
    ADC_REG_InitStruct.DMATransfer = LL_ADC_REG_DMA_TRANSFER_NONE;
    ADC_REG_InitStruct.Overrun = LL_ADC_REG_OVR_DATA_PRESERVED;
    LL_ADC_REG_Init(ADC1, &ADC_REG_InitStruct);
    LL_ADC_SetOverSamplingScope(ADC1, LL_ADC_OVS_DISABLE);
    LL_ADC_SetTriggerFrequencyMode(ADC1, LL_ADC_CLOCK_FREQ_MODE_LOW);

    LL_ADC_SetSamplingTimeCommonChannels(ADC1, LL_ADC_SAMPLINGTIME_COMMON_1, LL_ADC_SAMPLINGTIME_79CYCLES_5);
    LL_ADC_SetSamplingTimeCommonChannels(ADC1, LL_ADC_SAMPLINGTIME_COMMON_2, LL_ADC_SAMPLINGTIME_79CYCLES_5);
    LL_ADC_DisableIT_EOC(ADC1);
    LL_ADC_DisableIT_EOS(ADC1);

    /* Enable ADC internal voltage regulator */
    LL_ADC_EnableInternalRegulator(ADC1);
    LL_mDelay(1);

    // 调用这个之前必须要EnableInternalRegulator
    LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_1, LL_ADC_CHANNEL_3);

    while (LL_ADC_IsActiveFlag_CCRDY(ADC1) == 0) { }
    LL_ADC_ClearFlag_CCRDY(ADC1);

    LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_3, LL_ADC_SAMPLINGTIME_COMMON_1);

    if (LL_ADC_IsEnabled(ADC1) == 0) {
        LL_mDelay(100);

        LL_ADC_EnableInternalRegulator(ADC1);
        LL_mDelay(1);

        // 校准
        LL_ADC_StartCalibration(ADC1);
        while (LL_ADC_IsCalibrationOnGoing(ADC1) != 0) { }

        LL_ADC_Enable(ADC1);
        /* Poll for ADC ready to convert */
        while (LL_ADC_IsActiveFlag_ADRDY(ADC1) == 0) { }
        DebugPrint("adc ready\n");
    }
}