由于STM32F1的DMA1中只有ADC1，所以利用ADC1的扫描模式进行开4个通道进行DMA的ADC采值。
单片机源程序如下:
- #include "delay.h"
- #include "sys.h"
- #include "usart.h"
- #include "lcd.h"
- #include "adc.h"
- #include "dma.h"
- #define ADC1_DR_Address ((uint32_t)0x4001244C)
- u16 AD_Value[6];
- float volta[6];
- u8 i;
- int main()
- {
- SystemInit();
- delay_init(72); //延时初始化
- NVIC_Configuration();
- uart_init(9600);
- DMA_Config(DMA1_Channel1,(u32)ADC1_DR_Address,(u32)&AD_Value,6);//cndtr对应所开信道个数
- Adc_Init();
- DMA_Cmd(DMA1_Channel1, ENABLE); //启动DMA通道
- ADC_SoftwareStartConvCmd(ADC1, ENABLE); //软件启动AD转换
- while(1)
- {
- for(i=0;i<6;i++) //循环6次转换AD值
- {
- volta[i] =(float) AD_Value[i]/4095*3.3;
- }
- printf("AD1=%d\n",AD_Value[0]); printf("\r\n volta1 = %f V \r\n",volta[0]);
- printf("AD2=%d\n",AD_Value[1]); printf("\r\n volta2 = %f V \r\n",volta[1]);
- printf("AD3=%d\n",AD_Value[2]); printf("\r\n volta3 = %f V \r\n",volta[2]);
- printf("AD4=%d\n",AD_Value[3]); printf("\r\n volta4 = %f V \r\n",volta[3]);
- printf("AD5=%d\n",AD_Value[4]); printf("\r\n volta5 = %f V \r\n",volta[4]);
- printf("AD6=%d\n",AD_Value[5]); printf("\r\n volta6 = %f V \r\n",volta[5]);
- delay_ms(500);
- }
- }
所有资料51hei提供下载:
实验24 四通道ADC （DMA传输）.zip
(353.93 KB, 下载次数: 38)
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