STM32G4备战蓝桥杯嵌入式---模块配置---ADC_KEY（拓展板）

Posted 2022-11-29 旺旺^淞

文章目录

• ADC按键
• • 1.模块引脚
  • 2.Cubemx实现的配置
  • 3.生成工程
  • • 1.ADC采集函数
    • 2.ADC采集值处理
    • 3.按键识别
    • 4.按键控制
• 总结

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ADC按键

1.模块引脚

使用PA5接上AKEY

2.Cubemx实现的配置

3.生成工程

1.ADC采集函数

采集50次

#define BTN_BUFF_LEN	50
uint16_t btn_buff[BTN_BUFF_LEN];

uint16_t Read_ADC()

	uint16_t aa;
	HAL_ADC_Start(&hadc2);
	aa = HAL_ADC_GetValue(&hadc2);
	HAL_ADC_Stop(&hadc2);
	return aa;

2.ADC采集值处理

uint16_t Read_Btn(void)

	uint16_t tmp;
	uint8_t i = 0,j = 0;
	
	for(i=0; i<BTN_BUFF_LEN; i++)
		btn_buff[i] = Read_ADC();
	
	for(i=0; i<=BTN_BUFF_LEN/2; i++)
		for(j=0; j<	BTN_BUFF_LEN-i-1; j++)
			if(btn_buff[j+1] < btn_buff[j])
				tmp = btn_buff[j+1];
				btn_buff[j+1] = btn_buff[j];
				btn_buff[j] = tmp;
			
		
	

	if(BTN_BUFF_LEN % 2 == 0)
		return(btn_buff[BTN_BUFF_LEN/2-1] + btn_buff[BTN_BUFF_LEN/2])/2;
	else
		return(btn_buff[BTN_BUFF_LEN/2]);
	

3.按键识别

uint8_t Scan_Btn(void)

	uint16_t btn_tmp = 0;

	btn_tmp = Read_Btn();
	if(btn_tmp < 0x0FFF/14)
		return 1;
	else if((btn_tmp > 0x0FFF/14) && (btn_tmp < 0x0FFF/14*3))
		return 2;
	else if((btn_tmp > 0x0FFF/14*3) && (btn_tmp < 0x0FFF/14*5))
		return 3;
	else if((btn_tmp > 0x0FFF/14*5) && (btn_tmp < 0x0FFF/14*7))
		return 4;
	else if((btn_tmp > 0x0FFF/14*7) && (btn_tmp < 0x0FFF/14*9))
		return 5;
	else if((btn_tmp > 0x0FFF/14*9) && (btn_tmp < 0x0FFF/14*11))
		return 6;
	else if((btn_tmp > 0x0FFF/14*11) && (btn_tmp < 0x0FFF/14*13))
		return 7;
	else if((btn_tmp > 0x0FFF/14*13) && (btn_tmp < 0x0FDF))
		return 8;
	
	else
		return 0;	//error status & no key
	

4.按键控制

		adc = Scan_Btn();
		sprintf((char *)ass,"The key is press:%d",adc);
		LCD_DisplayStringLine(Line5,ass);
		HAL_Delay(200);

总结