【CW32L052 Review】 Segment LCD displays ADC sampling voltage value

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【CW32L052 Review】 Segment LCD displays ADC sampling voltage value [Copy link]

 

In this article, we will learn about the CW32L052 chip ADC voltage sampling and display the sampled voltage value on the LCD.

1. Hardware Circuit

The peripheral circuits of the hardware part related to ADC include analog power pins AVDD and AVSS, as well as analog signal input pins.

AVDD power connection circuit on the development board, connected to the power supply.

Regarding the ADC input pins, the definition in the manual

2. Procedure

2.1, fun_adc.c

#include "main.h"

void init_adc(void)
{
	ADC_InitTypeDef ADC_InitStruct;

  __RCC_ADC_CLK_ENABLE();

  ADC_InitStruct.ADC_AccEn = DISABLE;
  ADC_InitStruct.ADC_Align = ADC_AlignRight;
  ADC_InitStruct.ADC_ClkDiv = ADC_Clk_Div2;    // ADCCLK=16MHz
  ADC_InitStruct.ADC_InBufEn = DISABLE;
  ADC_InitStruct.ADC_OpMode = ADC_SingleChOneMode;
  ADC_InitStruct.ADC_SampleTime = ADC_SampTime5Clk;
  ADC_InitStruct.ADC_TsEn = DISABLE;
  ADC_InitStruct.ADC_VrefSel = ADC_Vref_VDDA;

  ADC_Init(&ADC_InitStruct);
  ADC_Enable();
	
}

uint16_t adc_readval(uint8_t ch)
{
	CW_ADC->CR1_f.CHMUX = ch;
	ADC_SoftwareStartConvCmd(ENABLE);
	while(CW_ADC->START_f.START);
	return CW_ADC->RESULT0;
}

2.2, fun_adc.h

#ifndef __FUN_ADC_H
#define __FUN_ADC_H

#include "base_types.h"

void init_adc(void);
uint16_t adc_readval(uint8_t ch);
#endif 

2.3, mian.c

int32_t main(void)
{
	uint8_t dp[8];
	uint8_t i=0;
	uint16_t tp=0;
	uint32_t dp1=0;
	uint32_t dp_temp=0;
	GPIO_InitTypeDef GPIO_InitStruct = {0};
	rcc_config();
	init_uart();
	init_led();
	init_adc();
	init_spi_flash();

	InitTick( 48000000 );                  //初始化SysTick
	LCD_Configuration();
	SPI_FLASH_Test();
	dp[0]=disp[0];
	dp[1]=disp[0];
	dp[2]=disp[0];
	dp[3]=disp[0];
	dp[4]=disp[0];
	dp[5]=disp[0];
	dp[6]=disp[0];
	dp[7]=disp[0];
		
	while (1)
	{
		float adv=0.0;
		tp=(adc_readval(1)*33)/4096;
		dp[4]=disp[tp/1000];
		dp[3]=disp[((tp%1000)/100)];
		dp[2]=disp_p[((tp%1000)%100)/10];
		dp[1]=disp[((tp%1000)%100)%10];
		dp[0]=0x4c;
		led2_tog();
		SysTickDelay(100);
		lcd_disp(dp);  
		adv=tp*0.1;
		printf("ADC value = %1.1f \r\n",adv );
	}
}

3. Program running

After downloading the program, run the development board and adjust the serial port output of the sampling voltage potentiometer

Run the video

adc

火辣西米秀

Adjust the sampling voltage potentiometer serial port output, the video demonstration is relatively accurate and stable

freebsder

Why is the last one only half?