stm32f429 ADC独立模式采集PA5电压，adc1正常工作，adc2则无法采集

uae · 发表于 2021-9-6 20:34:36

如题，我使用ADC1和DMA模式能正常采集PA5的电压，在原程序上将ADC1的部分都替换成了ADC2后，采集的数级一直为0.想请问各位大佬这是为什么.
我是将画红线的宏定义从ADC1改成了ADC2.

以下左边是ADC1，右边是ADC2.

uae · 发表于 2021-9-6 20:34:37

原来是DMA的数据流通道没改

uae · 发表于 2021-9-6 20:43:47

图片忘发了

修改的宏定义：

#define RHEOSTAT_ADC_GPIO_PORT GPIOA
#define RHEOSTAT_ADC_GPIO_PIN    GPIO_Pin_5
#define RHEOSTAT_ADC_GPIO_CLK    RCC_AHB1Periph_GPIOA

// ADC
#define RHEOSTAT_ADC             ADC2
#define RHEOSTAT_ADC_CLK       RCC_APB2Periph_ADC2
#define RHEOSTAT_ADC_CHANNEL    ADC_Channel_5

// ADC DR数据寄存器
#define RHEOSTAT_ADC_DR_ADDR ((u32)ADC2+0x4c)

// ADC DMA通道
#define RHEOSTAT_ADC_DMA_CLK    RCC_AHB1Periph_DMA2
#define RHEOSTAT_ADC_DMA_CHANNEL  DMA_Channel_0
#define RHEOSTAT_ADC_DMA_STREAM DMA2_Stream0

ADC1的串口助手：

The current AD value = 0x0E13

The current AD value = 2.877026 V

The current AD value = 0x0DFA

The current AD value = 2.889917 V

The current AD value = 0x0DFF

The current AD value = 2.896362 V

The current AD value = 0x0DED

The current AD value = 2.893140 V

The current AD value = 0x0DF2

The current AD value = 2.886694 V

The current AD value = 0x0DFE

The current AD value = 2.893140 V

ADC2的串口助手：

The current AD value = 0x0000

The current AD value = 0.000000 V

The current AD value = 0x0000

The current AD value = 0.000000 V

The current AD value = 0x0000

The current AD value = 0.000000 V

The current AD value = 0x0000

The current AD value = 0.000000 V