[mw_shl_code=c,true].c文件 #include "sys.h" #include "delay.h" #include "gp2y.h" void GP2Y_Init(void) { RCC->APB2ENR|=1<<4;//使能PC口 GPIOC->CRL&=0XFFFFFFF0;//pc0作为输入引脚 RCC->APB2ENR|=1<<9;//使能ADC1通道时钟 RCC->APB2RSTR|=1<<9;//ADC1复位 RCC->APB2RSTR&=~(1<<10);//复位结束 RCC->CFGR&=~(3<<14); //分频因子清零 RCC->CFGR|=2<<14;//设置ADC分频因子6 72M/6=12,ADC最大时间不能超过14M RCC->APB2RSTR|=1<<9; //复位ADC1 ADC1->CR1&=0XF0FFFF; //工作模式清零 ADC1->CR1|=0<<16;//独立工作模式 ADC1->CR1|=0<<13;//模数转换工作在单通道模式 ADC1->CR1&=~(1<<8); //非扫描模式 ADC1->CR2&=~(1<<1); //单次转换模式 ADC1->CR2&=~(7<<17); ADC1->CR2|=7<<17; //软件控制转换 ADC1->CR2&=~(1<<11); //右对齐 ADC1->SQR1&=~(0XF<<20); ADC1->SQR1|=0<<20; ADC1->SMPR2&=~(7<<3); //通道1采样时间清空 ADC1->SMPR2|=7<<3; //通道1 239.5周期,提高采样时间可以提高精确度 ADC1->CR2|=1<<0; //开启AD转换器 RCC->APB2ENR|=1<<9; //ADC1时钟使能 RCC->APB2RSTR|=1<<9; //ADC1复位 while(ADC1->CR2&1<<3); //等待校准结束 ADC1->CR2|=1<<2; //开启AD校准 while(ADC1->CR2&1<<2); //等待校准结束 RCC->APB2ENR|=1<<4;//使能PC口 GPIOC->CRL&=0XFFFFFF3F;//pc1作为输入引脚 GPIOC->CRL|=0X000000F0; } u16 Get_GP2Y(u8 ch) { u16 Vo; GP2Y_IO_OUT(); GP2Y_DQ_OUT=0; delay_us(280); Vo=Get_Adc_Average(ch,10); delay_us(40); GP2Y_DQ_OUT=1; delay_us(9680); return Vo; } .h文件 #ifndef __GP2Y_H #define __GP2Y_H #include "sys.h" #define GP2Y_IO_IN(){GPIOC->CRL&=0XFFFFFF0F;GPIOC->CRL|=8<<4;GPIOC->CRL&=0XFFFFFF0F;GPIOC->CRL|=3<<4;} #define GP2Y_IO_OUT(){GPIOC->CRL&=0XFFFFFF0F;GPIOC->CRL|=3<<4;GPIOC->CRL&=0XFFFFFF0F;GPIOC->CRL|=8<<4;} #define GP2Y_DQ_OUT PCout(0) // #define GP2Y_DQ_IN PCin(0) u16 Get_Adc_Average(u8 ch,u8 times); void GP2Y_Init(void); u16 Get_GP2Y(u8 ch); #endif main函数部分 #include "sys.h" #include "usart.h" #include "delay.h" #include "led.h" #include "lcd.h" #include "adc.h" #include "gp2y.h" #include "adc.h" int main() { u16 dustVal; float temp,ppm=0,ppmpercf=0,dustdensity=0; Stm32_Clock_Init(9); //系统时钟设置 uart_init(72,9600); //串口初始化为9600 delay_init(72); //延时初始化 LED_Init(); //初始化与LED连接的硬件接口 LCD_Init(); //初始化LCD Adc_Init(); GP2Y_Init(); //ADC初始化 POINT_COLOR=RED;//设置字体为红 {MOD} LCD_ShowString(60,50,200,16,16,"Mini STM32"); LCD_ShowString(60,70,200,16,16,"fenchen TEST"); LCD_ShowString(60,90,200,16,16,"ATOM@ALIENTEK"); LCD_ShowString(60,110,200,16,16,"2015/10/20"); //显示提示信息 POINT_COLOR=BLUE;//设置字体为蓝 {MOD} LCD_ShowString(60,130,200,16,16,"ADC: V"); LCD_ShowString(60,150,200,16,16,"DIANYA: V"); LCD_ShowString(60,170,200,16,16,"fenchenzhishu: "); while(1) { dustVal=Get_Adc_Average(ADC_CH1,10);//通道10的值 LCD_ShowxNum(132,130,dustVal,4,16,0);//显示ADC的值 ppm+=dustVal; temp=(float)dustVal*(3.3/4096); ppm=temp;//保存电压值 LCD_ShowxNum(148,150,ppm,3,16,0X80);//显示电压值 dustdensity=0.17*ppm-0.1; ppmpercf = (ppm-0.0256)*120000; if (ppmpercf < 0) {ppmpercf = 0;} if (dustdensity < 0 ) {dustdensity = 0;} if (dustdensity > 0.5) {dustdensity = 0.5;} LCD_ShowxNum(140,170,dustdensity,3,16,0);//显示灰尘指数 LCD_ShowxNum(164,170,ppmpercf,3,16,0X80); LED0=!LED0; delay_ms(250); } } [/mw_shl_code]