本帖最后由 小炎宇 于 2024-9-30 12:38 编辑
在使用GD32F470的ADC0和ADC2分别采集数据，并使能DMA传输数据时，发现采集到4个通道的数据，总会有一个通道的数据是0.但每次采集数据为0的通道并不固定，于是放大了DMA存储数据的目标地址缓冲区大小，发现，通道数据为0的位置已经固定且很有规律，不知道是哪里配置的问题，adc初始化时选择的模式是“全部ADC规则并行模式”（因为工程的宏中没有ADC0与ADC2规则并行模式），想请问出现这种情况是否是，把未使能的ADC1的通道数据也算上了，导致每次采集数据，三个通道轮番采集了一遍，还是说数据存储格式有问题，烦请各位大佬帮忙查看一下，下面是初始化代码和采集到的数据的现象。代码：
uint16_t ga_adc_dmabuf[ADC_SAMPLE_CH_BUTT] = {0}; //ADC_SAMPLE_CH_BUTT原本为4，现在为6
void dma_config (void)
{
/* ADC_DMA_channel configuration */
dma_single_data_parameter_struct dma_data_parameter;
/* enable DMA1 clock */
rcu_periph_clock_enable (RCU_DMA1);
dma_deinit (DMA1, DMA_CH0);
/* initialize DMA single data mode */
dma_data_parameter.periph_addr = (uint32_t) (&ADC_SYNCDATA);
dma_data_parameter.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
dma_data_parameter.memory0_addr = (uint32_t)ga_adc_dmabuf;
dma_data_parameter.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
dma_data_parameter.periph_memory_width = DMA_PERIPH_WIDTH_16BIT;
dma_data_parameter.circular_mode = DMA_CIRCULAR_MODE_ENABLE;
dma_data_parameter.direction = DMA_PERIPH_TO_MEMORY;
dma_data_parameter.number = ADC_SAMPLE_CH_BUTT;//现在扩大为6，原本只采集4个
dma_data_parameter.priority = DMA_PRIORITY_HIGH;
dma_single_data_mode_init (DMA1, DMA_CH0, &dma_data_parameter);
/* DMA channel 0 peripheral select */
dma_channel_subperipheral_select (DMA1, DMA_CH0, DMA_SUBPERI0);
/* enable DMA channel */
dma_channel_enable (DMA1, DMA_CH0);
}
int cal_adc_init (void)
{
rcu_periph_clock_enable (RCU_GPIOB);
rcu_periph_clock_enable (RCU_GPIOF);
cal_gpio_init (GPIOB, GPIO_PIN_0, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, 0);
cal_gpio_init (GPIOB, GPIO_PIN_1, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, 0);
cal_gpio_init (GPIOF, GPIO_PIN_6, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, 0);
cal_gpio_init (GPIOF, GPIO_PIN_7, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, 0);
/* enable ADC clock */
rcu_periph_clock_enable (RCU_ADC0);
rcu_periph_clock_enable (RCU_ADC2);
adc_clock_config (ADC_ADCCK_PCLK2_DIV4);
adc_deinit();
adc_sync_mode_config (ADC_ALL_ROUTINE_PARALLEL);
adc_sync_dma_config(ADC_SYNC_DMA_MODE0);
adc_sync_dma_request_after_last_enable();
/* ADC data alignment config */
adc_data_alignment_config (ADC0, ADC_DATAALIGN_RIGHT);
adc_data_alignment_config (ADC2, ADC_DATAALIGN_RIGHT);
/* ADC SCAN function enable */
adc_special_function_config (ADC0, ADC_SCAN_MODE, ENABLE);
adc_special_function_config (ADC2, ADC_SCAN_MODE, ENABLE);
/* ADC channel length config */
adc_channel_length_config (ADC0, ADC_ROUTINE_CHANNEL, 2);
adc_channel_length_config (ADC2, ADC_ROUTINE_CHANNEL, 2);
/* ADC routine channel config */
adc_routine_channel_config(ADC0, 0, ADC_CHANNEL_8, ADC_SAMPLETIME_15);
adc_routine_channel_config(ADC0, 1, ADC_CHANNEL_9, ADC_SAMPLETIME_15);
adc_routine_channel_config(ADC2, 0, ADC_CHANNEL_4, ADC_SAMPLETIME_15);
adc_routine_channel_config(ADC2, 1, ADC_CHANNEL_5, ADC_SAMPLETIME_15);
/* ADC external trigger enable */
adc_external_trigger_config(ADC0,ADC_ROUTINE_CHANNEL,EXTERNAL_TRIGGER_RISING);
adc_external_trigger_config(ADC2,ADC_ROUTINE_CHANNEL,EXTERNAL_TRIGGER_DISABLE);
adc_external_trigger_source_config(ADC0,ADC_ROUTINE_CHANNEL,ADC_EXTTRIG_ROUTINE_T1_CH1);
/* enable ADC interface */
adc_enable(ADC0);
/* wait for ADC stability */
cal_time_system_sleep_ms(1);
/* ADC calibration and reset calibration */
adc_calibration_enable(ADC0);
/* enable ADC interface */
adc_enable(ADC2);
/* wait for ADC stability */
cal_time_system_sleep_ms(1);
/* ADC calibration and reset calibration */
adc_calibration_enable(ADC2);
return 0;
}
采集出来的数据现象：
file:///C:/Users/z01454/Documents/WXWork/1688857742517246/Cache/Image/2024-09/企业微信截图_17276583127832.png
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