CH32V208WBU6/DRV/drv_adc.c

/*
 * drv_adc.c
 *
 *  Created on: Mar 31, 2023
 *      Author: gxms0
 */

#include "drv_adc.h"


void ADC1_2_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
void DMA1_Channel1_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));


uint32_t adc_raw[4] = {0};


void adc_init(void)
{
    NVIC_InitTypeDef NVIC_InitStructure = {0};
    ADC_InitTypeDef  ADC_InitStructure = {0};
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    DMA_InitTypeDef DMA_InitStructure = {0};

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 |GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    DMA_DeInit(DMA1_Channel1);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->RDATAR;//ADC地址
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)adc_raw; //内存地址
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //方向(从外设到内存)
    DMA_InitStructure.DMA_BufferSize = sizeof(adc_raw); //传输内容的大小
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址固定
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址增加
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word ; //外设数据单位
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word ;    //内存数据单位
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal  ; //DMA模式：循环传输
    DMA_InitStructure.DMA_Priority = DMA_Priority_Low ; //优先级：高
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;   //禁止内存到内存的传输

    DMA_Init(DMA1_Channel1, &DMA_InitStructure);  //配置DMA1的1通道



    ADC_DeInit(ADC1);
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = ENABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 4;
    ADC_Init(ADC1, &ADC_InitStructure);

    RCC_ADCCLKConfig(RCC_PCLK2_Div8);// adc_clock = 96/8 = 12Mhz

    ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_239Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 2, ADC_SampleTime_239Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 3, ADC_SampleTime_239Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 4, ADC_SampleTime_239Cycles5);

    ADC_DMACmd(ADC1, ENABLE);

    ADC_Cmd(ADC1, ENABLE);


    ADC_BufferCmd(ADC1, DISABLE); //disable buffer
    ADC_ResetCalibration(ADC1);
    while(ADC_GetResetCalibrationStatus(ADC1));
    ADC_StartCalibration(ADC1);
    while(ADC_GetCalibrationStatus(ADC1));

    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = ADC_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
    NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
    DMA_Cmd(DMA1_Channel1,ENABLE);

    ADC_ITConfig( ADC1, ADC_IT_EOC, ENABLE);//使能规则通道中断
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}




void ADC1_2_IRQHandler (void)//在启动头文件中找到
{
   //判断中断是否真的来了（初始化函数使能的便是ADC_IT_EOC中断））
   if(ADC_GetITStatus( ADC1, ADC_IT_EOC)!=RESET)
   {
       //中断真的来了就要读取转换值了
       //printf("adc-interrupt");
       ADC_ClearITPendingBit(ADC1, ADC_IT_EOC);//清除中断
   }

}


void DMA1_Channel1_IRQHandler(void)
{

    if(DMA_GetFlagStatus(DMA1_IT_TC1))
    {
        printf("adc dma:%4d,%4d,%4d,%4d  \n", adc_raw[0],adc_raw[1],adc_raw[2],adc_raw[3]);

        /* 失能DMA1通道1，以防在中断过程中发生DMA传输 */
        DMA_Cmd(DMA1_Channel1, DISABLE);
        /* 如果DMA设置的是normal模式，需要手动重装计数器 */
        DMA1_Channel1->CNTR = sizeof(adc_raw);
        /* 清除中断标志位 */
        DMA_ClearITPendingBit(DMA1_IT_TC1);
        // DMA_ClearFlag(DMA1_FLAG_TC1);
        /* 重新使能DMA1通道1，开始工作 */
        //DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
        DMA_Cmd(DMA1_Channel1,ENABLE);
    }
}