GD32A50x使用DMA采集双ADC多通道数据

一.概述

如图所示，我们配置为常规并行模式，根据配置顺序，对应二个通道的数据会搬运到DMA中，ADC0通道的数据为低16位，对应ADC1通道数据在高16位。同时我们选择是外部触发转换，也需要配置定时器产生脉冲。

二.配置外设

2.1 配置ADC

static void adc_config(void)
{
    /* ADC continous function enable */
    adc_special_function_config(ADC0, ADC_SCAN_MODE, ENABLE);
    adc_special_function_config(ADC0, ADC_CONTINUOUS_MODE, DISABLE);
    adc_special_function_config(ADC1, ADC_SCAN_MODE, ENABLE);
    adc_special_function_config(ADC1, ADC_CONTINUOUS_MODE, DISABLE);
    /* ADC trigger config */
    adc_external_trigger_source_config(ADC0, ADC_REGULAR_CHANNEL, ADC0_1_EXTTRIG_REGULAR_TRIGSEL);
    adc_external_trigger_source_config(ADC1, ADC_REGULAR_CHANNEL, ADC0_1_EXTTRIG_REGULAR_NONE);
    /* ADC data alignment config */
    adc_data_alignment_config(ADC0, ADC_DATAALIGN_RIGHT);
    adc_data_alignment_config(ADC1, ADC_DATAALIGN_RIGHT);
    /* ADC mode config */
    adc_mode_config(ADC_DAUL_REGULAL_PARALLEL);
   // adc_mode_config(ADC_MODE_FREE);
    /* ADC channel length config */
    adc_channel_length_config(ADC0, ADC_REGULAR_CHANNEL, CHANNEL_NUM);
    adc_channel_length_config(ADC1, ADC_REGULAR_CHANNEL, CHANNEL_NUM);

    /* ADC regular channel config */
    adc_regular_channel_config(ADC0, 0, ADC_CHANNEL_1, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC0, 1, ADC_CHANNEL_3, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC0, 2, ADC_CHANNEL_6, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC0, 3, ADC_CHANNEL_8, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC0, 4, ADC_CHANNEL_9, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC0, 5, ADC_CHANNEL_12, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC0, 6, ADC_CHANNEL_15, ADC_SAMPLETIME_2POINT5);

    adc_regular_channel_config(ADC1, 0, ADC_CHANNEL_6, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC1, 1, ADC_CHANNEL_8, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC1, 2, ADC_CHANNEL_16, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC1, 3, ADC_CHANNEL_13, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC1, 4, ADC_CHANNEL_12, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC1, 5, ADC_CHANNEL_10, ADC_SAMPLETIME_2POINT5);
    adc_regular_channel_config(ADC1, 6, ADC_CHANNEL_5, ADC_SAMPLETIME_2POINT5);


    /* ADC external trigger enable */
    adc_external_trigger_config(ADC0, ADC_REGULAR_CHANNEL, ENABLE);
    adc_external_trigger_config(ADC1, ADC_REGULAR_CHANNEL, ENABLE);
    /* enable ADC interface */
    adc_enable(ADC0);
    vTaskDelay(1);
    /* ADC calibration and reset calibration */
    adc_calibration_enable(ADC0);
    /* enable ADC interface */
    adc_enable(ADC1);
    vTaskDelay(1);
    /* ADC calibration and reset calibration */
    adc_calibration_enable(ADC1);

    /* ADC DMA function enable */
    adc_dma_mode_enable(ADC0);
    adc_dma_mode_enable(ADC1);
}

2.2.配置DMA

static void dma_config(void)
{  
    /* ADC_DMA_channel configuration */
    dma_parameter_struct dma_data_parameter;
    /* ADC DMA_channel configuration */
    dma_deinit(DMA0, DMA_CH0);
    /* initialize DMA single data mode */
    dma_data_parameter.periph_addr  = (uint32_t)(&ADC_RDATA(ADC0));
    dma_data_parameter.periph_inc   = DMA_PERIPH_INCREASE_DISABLE;
    dma_data_parameter.memory_addr  = (uint32_t)(&g_adc_value);
    dma_data_parameter.memory_inc   = DMA_MEMORY_INCREASE_ENABLE;
    dma_data_parameter.periph_width = DMA_PERIPHERAL_WIDTH_32BIT;
    dma_data_parameter.memory_width = DMA_MEMORY_WIDTH_32BIT;
    dma_data_parameter.direction    = DMA_PERIPHERAL_TO_MEMORY;
    dma_data_parameter.number       = CHANNEL_NUM * SAM_NUM;
    dma_data_parameter.priority     = DMA_PRIORITY_HIGH;
    dma_data_parameter.request      = DMA_REQUEST_ADC;
    dma_init(DMA0, DMA_CH0, &dma_data_parameter);
    dma_circulation_enable(DMA0, DMA_CH0);
    /* enable DMA channel */
    dma_channel_enable(DMA0, DMA_CH0);
}

3.3 配置定时器

static void timer_config(void)
{
    timer_oc_parameter_struct timer_ocinitpara;
    timer_parameter_struct timer_initpara;

    /* TIMER1 configuration */
    timer_initpara.prescaler         = 999;
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;
    timer_initpara.period            = 999;
    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
    timer_initpara.repetitioncounter = 0;
    timer_init(TIMER1, &timer_initpara);

    /* CH0 configuration in PWM mode1 */
    timer_ocinitpara.outputstate  = TIMER_CCX_ENABLE;
    timer_ocinitpara.outputnstate = TIMER_CCXN_DISABLE;
    timer_ocinitpara.ocpolarity   = TIMER_OC_POLARITY_HIGH;
    timer_ocinitpara.ocnpolarity  = TIMER_OCN_POLARITY_HIGH;
    timer_ocinitpara.ocidlestate  = TIMER_OC_IDLE_STATE_LOW;
    timer_ocinitpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;
    timer_channel_output_config(TIMER1, TIMER_CH_1, &timer_ocinitpara);

    timer_channel_output_pulse_value_config(TIMER1, TIMER_CH_1, 399);
    timer_channel_output_mode_config(TIMER1, TIMER_CH_1, TIMER_OC_MODE_PWM1);
    timer_channel_output_shadow_config(TIMER1, TIMER_CH_1, TIMER_OC_SHADOW_DISABLE);
}

三.最后

最后根据自己的实际情况进行修改，这只是一个demo。