之前看到一个博文，写的是关于AT32_ADC+DMA单次传输再触发的一个例子，这个例子里边分两次配置的DMA，那么我想要问一下，针对不同的功能使用dma 是不是可以一次性配置好呢？一下是博文内容：
ADC+DMA软件触发，DMA配置传输完中断
#define Channel_num 4
#define ADC1_BUffer_Size 64
#define DMA_buffer_size (Channel_num*ADC1_BUffer_Size)
uint16_t ADC1_Buffer[ADC1_BUffer_Size][Channel_num] = {0};
//采样率：ADC_CLK=25M,转换时间=239.5+12.5个周期，252*0.04 = 10.08us,采样率=1/10.08=99.2Khz
/**
* @brief init adc1 function.
* @param none
* @retval none
*/
void wk_adc1_init(void)
{
crm_periph_clock_enable(CRM_ADC1_PERIPH_CLOCK, TRUE);
crm_periph_clock_enable(CRM_GPIOC_PERIPH_CLOCK, TRUE);
gpio_init_type gpio_init_struct;
adc_base_config_type adc_base_struct;
gpio_default_para_init(&gpio_init_struct);
/*gpio--------------------------------------------------------------------*/
/* configure the IN10 pin */
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_0;
gpio_init(GPIOC, &gpio_init_struct);
/* configure the IN11 pin */
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_1;
gpio_init(GPIOC, &gpio_init_struct);
/* configure the IN12 pin */
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_2;
gpio_init(GPIOC, &gpio_init_struct);
/* configure the IN13 pin */
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_3;
gpio_init(GPIOC, &gpio_init_struct);
crm_adc_clock_div_set(CRM_ADC_DIV_4);//4分频，APB2/4 = 25Mhz
/*adc_common_settings-------------------------------------------------------------*/
adc_combine_mode_select(ADC_INDEPENDENT_MODE);
/*adc_settings--------------------------------------------------------------------*/
adc_base_default_para_init(&adc_base_struct);
adc_base_struct.sequence_mode = TRUE;
adc_base_struct.repeat_mode = TRUE;
adc_base_struct.data_align = ADC_RIGHT_ALIGNMENT;
adc_base_struct.ordinary_channel_length = 4;
adc_base_config(ADC1, &adc_base_struct);
/* adc_ordinary_conversionmode-------------------------------------------- */
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_10, 1, ADC_SAMPLETIME_239_5);
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_11, 2, ADC_SAMPLETIME_239_5);
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_12, 3, ADC_SAMPLETIME_239_5);
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_13, 4, ADC_SAMPLETIME_239_5);
adc_ordinary_conversion_trigger_set(ADC1, ADC12_ORDINARY_TRIG_SOFTWARE, TRUE);
adc_ordinary_part_mode_enable(ADC1, FALSE);
adc_dma_mode_enable(ADC1, TRUE);
adc_enable(ADC1, TRUE);
/* adc calibration-------------------------------------------------------- */
adc_calibration_init(ADC1);
while(adc_calibration_init_status_get(ADC1));
adc_calibration_start(ADC1);
while(adc_calibration_status_get(ADC1));
}
uint8_t adc_flag=0;
/**
* @brief init dma1 channel1 for "adc1"
* @param none
* @retval none
*/
void wk_dma1_channel1_init(void)
{
dma_init_type dma_init_struct;
crm_periph_clock_enable(CRM_DMA1_PERIPH_CLOCK, TRUE);
dma_reset(DMA1_CHANNEL1);
dma_default_para_init(&dma_init_struct);
dma_init_struct.direction = DMA_DIR_PERIPHERAL_TO_MEMORY;
dma_init_struct.memory_data_width = DMA_MEMORY_DATA_WIDTH_HALFWORD;
dma_init_struct.memory_inc_enable = TRUE;
dma_init_struct.peripheral_data_width = DMA_PERIPHERAL_DATA_WIDTH_HALFWORD;
dma_init_struct.peripheral_inc_enable = FALSE;
dma_init_struct.priority = DMA_PRIORITY_MEDIUM;
dma_init_struct.loop_mode_enable = FALSE;
dma_init_struct.peripheral_base_addr = (uint32_t)&ADC1->odt;
dma_init_struct.memory_base_addr = (uint32_t)ADC1_Buffer;
dma_init_struct.buffer_size = DMA_buffer_size;
dma_init(DMA1_CHANNEL1, &dma_init_struct);
nvic_irq_enable(DMA1_Channel1_IRQn, 1, 0);
/* flexible function enable */
dma_flexible_config(DMA1, FLEX_CHANNEL1, DMA_FLEXIBLE_ADC1);
dma_interrupt_enable(DMA1_CHANNEL1, DMA_FDT_INT, TRUE);
}
void ADC1_Init()
{
wk_dma1_channel1_init();
dma_channel_enable(DMA1_CHANNEL1, TRUE);
wk_adc1_init();
adc_ordinary_software_trigger_enable(ADC1, TRUE);//软件触发
}
触发结束后，再次设置DMA传递数据长度并使能
dma_channel_enable(DMA1_CHANNEL1, FALSE);
dma_data_number_set(DMA1_CHANNEL1,256);
dma_channel_enable(DMA1_CHANNEL1, TRUE);
adc_ordinary_software_trigger_enable(ADC1, TRUE);//软件触发
原文链接：https://blog.csdn.net/weixin_43554366/article/details/142836052
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