【瑞萨RA4系列开发板体验】4.adc使用

rasc 配置

1.配置adc引脚

2.配置stacks adc

2.

软件

bsp_adc0.h

#ifndef __RA4_ADC0_H__
#define __RA4_ADC0_H__
#include "hal_data.h"
#include "stdio.h"

/*adc始化 */
void adc0_Init(void);
void read_adc(void);
#endif

bsp_adc0.c

#include "bsp_adc0.h"

/*

初始化 */
void adc0_Init(void)
{
   fsp_err_t err = FSP_SUCCESS;
  /* 初始化adc */
  err = R_ADC_Open(&g_adc0_ctrl, &g_adc0_cfg);
  /* Handle any errors. This function should be defined by the user. */
  if(FSP_SUCCESS != err)
    {
        printf("ADC0 Open API failed\\r\\n");
    }
  /* 配置并是能通道 */
    err = R_ADC_ScanCfg(&g_adc0_ctrl, &g_adc0_channel_cfg);
    assert(FSP_SUCCESS == err);
}

/*
adc中断回调 */
volatile bool scan_complete_flag = false;
void adc0_callback(adc_callback_args_t * p_args)
{
	//宏将告知编译器回调函数不使用参数 p_args，从而避免编译器发出警告，
    FSP_PARAMETER_NOT_USED(p_args);
    scan_complete_flag = true;
}

void read_adc(void)
{
  fsp_err_t err = FSP_SUCCESS;
  double a0,a1,a2;
  uint16_t adc_data=0;
  (void) R_ADC_ScanStart(&g_adc0_ctrl);
   scan_complete_flag = false;
  while (!scan_complete_flag)
  {
      /* Wait for callback to set flag. */
  }
  /*
		读取adc的值
	*/
  err = R_ADC_Read(&g_adc0_ctrl, ADC_CHANNEL_0, &adc_data);
  assert(FSP_SUCCESS == err);
  a0=(double)(adc_data/4095.0)*3.3;
	
	err = R_ADC_Read(&g_adc0_ctrl, ADC_CHANNEL_1, &adc_data);
  assert(FSP_SUCCESS == err);
  a1=(double)(adc_data/4095.0)*3.3;
	
	err = R_ADC_Read(&g_adc0_ctrl, ADC_CHANNEL_2, &adc_data);
  assert(FSP_SUCCESS == err);
  a2=(double)(adc_data/4095.0)*3.3;
  printf("ch0 %f ch2 %f ch3 %fv: %.02f \\r\\n",a0,a1,a2);
}

测试结果

审核编辑 黄昊宇