ADC 用5个通道DMA采样正常，为什么增加到7个的时候数据就错误
这是数据保存地址u16 adcvalue = {0};//ADC DMA保存地址
#define DMA1_CHANNEL1_BUFFER_SIZE 42
//初始化DMA
wk_dma_channel_config(DMA1_CHANNEL1,
(uint32_t)&ADC1->odt,
(uint32_t)adcvalue,
DMA1_CHANNEL1_BUFFER_SIZE);
dma_channel_enable(DMA1_CHANNEL1, TRUE);
//ADC初始化
void wk_adc1_init(void)
{
/* add user code begin adc1_init 0 */
/* add user code end adc1_init 0 */
gpio_init_type gpio_init_struct;
adc_base_config_type adc_base_struct;
gpio_default_para_init(&gpio_init_struct);
/* add user code begin adc1_init 1 */
/* add user code end adc1_init 1 */
/* gpio--------------------------------------------------------------------*/
/* configure the IN0 pin */
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_0;
gpio_init(GPIOA, &gpio_init_struct);
/* configure the IN1 pin */
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_1;
gpio_init(GPIOA, &gpio_init_struct);
/* configure the IN2 pin */
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_2;
gpio_init(GPIOA, &gpio_init_struct);
/* configure the IN3 pin */
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_3;
gpio_init(GPIOA, &gpio_init_struct);
/* configure the IN4 pin */
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_4;
gpio_init(GPIOA, &gpio_init_struct);
/* configure the IN8 pin */
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_0;
gpio_init(GPIOB, &gpio_init_struct);
/* configure the IN9 pin */
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_1;
gpio_init(GPIOB, &gpio_init_struct);
crm_adc_clock_div_set(CRM_ADC_DIV_6);
/* 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 = 7;
adc_base_config(ADC1, &adc_base_struct);
/* adc_ordinary_conversionmode-------------------------------------------- */
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_0, 1, ADC_SAMPLETIME_71_5);
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_1, 2, ADC_SAMPLETIME_71_5);
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_2, 3, ADC_SAMPLETIME_71_5);
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_3, 4, ADC_SAMPLETIME_71_5);
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_4, 5, ADC_SAMPLETIME_71_5);
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_8, 6, ADC_SAMPLETIME_71_5);
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_9, 7, ADC_SAMPLETIME_71_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);
/**
* Users need to configure ADC1 interrupt functions according to the actual application.
* 1. Call the below function to enable the corresponding ADC1 interrupt.
* --adc_interrupt_enable(...)
* 2. Add the user's interrupt handler code into the below function in the at32f421_int.c file.
* --void ADC1_CMP_IRQHandler(void)
*/
/* add user code begin adc1_init 2 */
/* add user code end adc1_init 2 */
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));
/* add user code begin adc1_init 3 */
/* add user code end adc1_init 3 */
}
AT32F421 DMA只有5个通道
怎么个错法？
帖中源码实测数据正常。
但是由于buffer定义的adcvalue ，所以ADC一个完整的序列的转换结果存储在adcvalue ~adcvalue，你说的数据错误是否是看到序列与数组维数没按照维度对应？——如果是此点问题的话，直接将数组修改为adcvalue 即可 看手册看一下对应芯片DMA支持的通道数，还有就是所有配置完了之后再启动DMA。不然容易数据没对准，尤其是通道多的情况下。比如通道一对到通道二的数组里去了。
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