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一实验概述 利用CH32V307的12bit ADC制作一个光照强度监测与报警系统,主要的元器件有光敏电阻传感器、OLED屏幕、继电器、蜂鸣器、CH32V307 开发板。
二实验原理图
三CH32V307 ADC 外设介绍 ADC包含两个12位ADC ,最高频率位14MHz(程序设计过程中经常采用8分频),支持18个通道其中两个位内部信号源,可以实现单次转换、连续转换,通道间自动扫描模式、间断模式、外部触发模式、双重采样等功能。
这里我们主要采用ADC1的通道1,实现外部光照强度大小的测量,并在OLED模块上显示,以及设计最大报警阈值,通过继电器控制蜂鸣器。四代码实现ADC.c - #include "adc.h"
- s16 Calibrattion_Val = 0;//校准值
- void MX_ADC_Init(void)
- {
- ADC_InitTypeDef hadc1;//ADC 句柄
- GPIO_InitTypeDef GPIO_Initure;//GPIO 句柄
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1|RCC_APB2Periph_GPIOA, ENABLE);
- //开启ADC1 GPIOA的时钟
- RCC_ADCCLKConfig(RCC_PCLK2_Div8);//ADC 频率设置
- GPIO_Initure.GPIO_Pin=GPIO_Pin_0;
- GPIO_Initure.GPIO_Mode=GPIO_Mode_AIN;//选择模拟输入
- GPIO_Init(GPIOA, &GPIO_Initure);
- hadc1.ADC_Mode=ADC_Mode_Independent;//配置ADC位独立模式
- hadc1.ADC_ScanConvMode=DISABLE;//不选择扫描模式
- hadc1.ADC_ContinuousConvMode=ENABLE;//使能连续转换模式
- hadc1.ADC_DataAlign=ADC_DataAlign_Right;
- hadc1.ADC_ExternalTrigConv=ADC_ExternalTrigConv_None;
- hadc1.ADC_NbrOfChannel=1;
- ADC_Init(ADC1, &hadc1);
- ADC_Cmd(ADC1, ENABLE);
- ADC_BufferCmd(ADC1, DISABLE); //disable buffer
- //测量ADC校准数据,也可以不使用。
- ADC_ResetCalibration(ADC1);
- while(ADC_GetResetCalibrationStatus(ADC1));
- ADC_StartCalibration(ADC1);
- while(ADC_GetCalibrationStatus(ADC1));
- Calibrattion_Val = Get_CalibrationValue(ADC1);
- ADC_BufferCmd(ADC1, ENABLE); //enable buffer
- }
- u16 Get_ADC_Val(u8 ch)
- {
- u16 val;
- ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 );
- ADC_SoftwareStartConvCmd(ADC1, ENABLE);
- while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));
- val = ADC_GetConversionValue(ADC1);
- return val;
- }
复制代码OLED.c 这里我们常采用软件SPI实现屏幕显示 - #include "oled.h"
- #include "oledfont.h"
- u8 OLED_GRAM[144][8];
- //反显函数
- void OLED_ColorTurn(u8 i)
- {
- if(i==0)
- {
- OLED_WR_Byte(0xA6,OLED_CMD);//正常显示
- }
- if(i==1)
- {
- OLED_WR_Byte(0xA7,OLED_CMD);//反色显示
- }
- }
- //屏幕旋转180度
- void OLED_DisplayTurn(u8 i)
- {
- if(i==0)
- {
- OLED_WR_Byte(0xC8,OLED_CMD);//正常显示
- OLED_WR_Byte(0xA1,OLED_CMD);
- }
- if(i==1)
- {
- OLED_WR_Byte(0xC0,OLED_CMD);//反转显示
- OLED_WR_Byte(0xA0,OLED_CMD);
- }
- }
- void OLED_WR_Byte(u8 dat,u8 cmd)
- {
- u8 i;
- if(cmd)
- OLED_DC_Set();
- else
- OLED_DC_Clr();
- OLED_CS_Clr();
- for(i=0;i<8;i++)
- {
- OLED_SCLK_Clr();
- if(dat&0x80)
- OLED_SDIN_Set();
- else
- OLED_SDIN_Clr();
- OLED_SCLK_Set();
- dat<<=1;
- }
- OLED_CS_Set();
- OLED_DC_Set();
- }
- //开启OLED显示
- void OLED_DisPlay_On(void)
- {
- OLED_WR_Byte(0x8D,OLED_CMD);//电荷泵使能
- OLED_WR_Byte(0x14,OLED_CMD);//开启电荷泵
- OLED_WR_Byte(0xAF,OLED_CMD);//点亮屏幕
- }
- //关闭OLED显示
- void OLED_DisPlay_Off(void)
- {
- OLED_WR_Byte(0x8D,OLED_CMD);//电荷泵使能
- OLED_WR_Byte(0x10,OLED_CMD);//关闭电荷泵
- OLED_WR_Byte(0xAF,OLED_CMD);//关闭屏幕
- }
- //更新显存到OLED
- void OLED_Refresh(void)
- {
- u8 i,n;
- for(i=0;i<8;i++)
- {
- OLED_WR_Byte(0xb0+i,OLED_CMD); //设置行起始地址
- OLED_WR_Byte(0x00,OLED_CMD); //设置低列起始地址
- OLED_WR_Byte(0x10,OLED_CMD); //设置高列起始地址
- for(n=0;n<128;n++)
- OLED_WR_Byte(OLED_GRAM[n][i],OLED_DATA);
- }
- }
- //清屏函数
- void OLED_Clear(void)
- {
- u8 i,n;
- for(i=0;i<8;i++)
- {
- for(n=0;n<128;n++)
- {
- OLED_GRAM[n][i]=0;//清除所有数据
- }
- }
- OLED_Refresh();//更新显示
- }
- //画点
- //x:0~127
- //y:0~63
- void OLED_DrawPoint(u8 x,u8 y)
- {
- u8 i,m,n;
- i=y/8;
- m=y%8;
- n=1<
- OLED_GRAM[x][i]|=n;
- }
- //清除一个点
- //x:0~127
- //y:0~63
- void OLED_ClearPoint(u8 x,u8 y)
- {
- u8 i,m,n;
- i=y/8;
- m=y%8;
- n=1<
- OLED_GRAM[x][i]=~OLED_GRAM[x][i];
- OLED_GRAM[x][i]|=n;
- OLED_GRAM[x][i]=~OLED_GRAM[x][i];
- }
- //画线
- //x:0~128
- //y:0~64
- void OLED_DrawLine(u8 x1,u8 y1,u8 x2,u8 y2)
- {
- u8 i,k,k1,k2;
- if((x1<0)||(x2>128)||(y1<0)||(y2>64)||(x1>x2)||(y1>y2))return;
- if(x1==x2) //画竖线
- {
- for(i=0;i<(y2-y1);i++)
- {
- OLED_DrawPoint(x1,y1+i);
- }
- }
- else if(y1==y2) //画横线
- {
- for(i=0;i<(x2-x1);i++)
- {
- OLED_DrawPoint(x1+i,y1);
- }
- }
- else //画斜线
- {
- k1=y2-y1;
- k2=x2-x1;
- k=k1*10/k2;
- for(i=0;i<(x2-x1);i++)
- {
- OLED_DrawPoint(x1+i,y1+i*k/10);
- }
- }
- }
- //x,y:圆心坐标
- //r:圆的半径
- void OLED_DrawCircle(u8 x,u8 y,u8 r)
- {
- int a, b,num;
- a = 0;
- b = r;
- while(2 * b * b >= r * r)
- {
- OLED_DrawPoint(x + a, y - b);
- OLED_DrawPoint(x - a, y - b);
- OLED_DrawPoint(x - a, y + b);
- OLED_DrawPoint(x + a, y + b);
- OLED_DrawPoint(x + b, y + a);
- OLED_DrawPoint(x + b, y - a);
- OLED_DrawPoint(x - b, y - a);
- OLED_DrawPoint(x - b, y + a);
- a++;
- num = (a * a + b * b) - r*r;//计算画的点离圆心的距离
- if(num > 0)
- {
- b--;
- a--;
- }
- }
- }
- //在指定位置显示一个字符,包括部分字符
- //x:0~127
- //y:0~63
- //size:选择字体 12/16/24
- //取模方式 逐列式
- void OLED_ShowChar(u8 x,u8 y,u8 chr,u8 size1)
- {
- u8 i,m,temp,size2,chr1;
- u8 y0=y;
- size2=(size1/8+((size1%8)?1:0))*(size1/2); //得到字体一个字符对应点阵集所占的字节数
- chr1=chr-' '; //计算偏移后的值
- for(i=0;i
- {
- if(size1==12)
- {temp=asc2_1206[chr1][i];} //调用1206字体
- else if(size1==16)
- {temp=asc2_1608[chr1][i];} //调用1608字体
- else if(size1==24)
- {temp=asc2_2412[chr1][i];} //调用2412字体
- else return;
- for(m=0;m<8;m++) //写入数据
- {
- if(temp&0x80)OLED_DrawPoint(x,y);
- else OLED_ClearPoint(x,y);
- temp<<=1;
- y++;
- if((y-y0)==size1)
- {
- y=y0;
- x++;
- break;
- }
- }
- }
- }
- //显示字符串
- //x,y:起点坐标
- //size1:字体大小
- //*chr:字符串起始地址
- void OLED_ShowString(u8 x,u8 y,u8 *chr,u8 size1)
- {
- while((*chr>=' ')&&(*chr<='~'))//判断是不是非法字符!
- {
- OLED_ShowChar(x,y,*chr,size1);
- x+=size1/2;
- if(x>128-size1) //换行
- {
- x=0;
- y+=2;
- }
- chr++;
- }
- }
- //m^n
- u32 OLED_Pow(u8 m,u8 n)
- {
- u32 result=1;
- while(n--)
- {
- result*=m;
- }
- return result;
- }
- ////显示2个数字
- ////x,y :起点坐标
- ////len :数字的位数
- ////size:字体大小
- void OLED_ShowNum(u8 x,u8 y,u32 num,u8 len,u8 size1)
- {
- u8 t,temp;
- for(t=0;t
- {
- temp=(num/OLED_Pow(10,len-t-1))%10;
- if(temp==0)
- {
- OLED_ShowChar(x+(size1/2)*t,y,'0',size1);
- }
- else
- {
- OLED_ShowChar(x+(size1/2)*t,y,temp+'0',size1);
- }
- }
- }
- //显示汉字
- //x,y:起点坐标
- //num:汉字对应的序号
- //取模方式 列行式
- void OLED_ShowChinese(u8 x,u8 y,u8 num,u8 size1)
- {
- u8 i,m,n=0,temp,chr1;
- u8 x0=x,y0=y;
- u8 size3=size1/8;
- while(size3--)
- {
- chr1=num*size1/8+n;
- n++;
- for(i=0;i
- {
- if(size1==16)
- {temp=Hzk1[chr1][i];}//调用16*16字体
- else if(size1==24)
- {temp=Hzk2[chr1][i];}//调用24*24字体
- else if(size1==32)
- {temp=Hzk3[chr1][i];}//调用32*32字体
- else if(size1==64)
- {temp=Hzk4[chr1][i];}//调用64*64字体
- else return;
- for(m=0;m<8;m++)
- {
- if(temp&0x01)OLED_DrawPoint(x,y);
- else OLED_ClearPoint(x,y);
- temp>>=1;
- y++;
- }
- x++;
- if((x-x0)==size1)
- {x=x0;y0=y0+8;}
- y=y0;
- }
- }
- }
- //num 显示汉字的个数
- //space 每一遍显示的间隔
- void OLED_ScrollDisplay(u8 num,u8 space)
- {
- u8 i,n,t=0,m=0,r;
- while(1)
- {
- if(m==0)
- {
- OLED_ShowChinese(128,24,t,16); //写入一个汉字保存在OLED_GRAM[][]数组中
- t++;
- }
- if(t==num)
- {
- for(r=0;r<16*space;r++) //显示间隔
- {
- for(i=0;i<144;i++)
- {
- for(n=0;n<8;n++)
- {
- OLED_GRAM[i-1][n]=OLED_GRAM[i][n];
- }
- }
- OLED_Refresh();
- }
- t=0;
- }
- m++;
- if(m==16){m=0;}
- for(i=0;i<144;i++) //实现左移
- {
- for(n=0;n<8;n++)
- {
- OLED_GRAM[i-1][n]=OLED_GRAM[i][n];
- }
- }
- OLED_Refresh();
- }
- }
- //配置写入数据的起始位置
- void OLED_WR_BP(u8 x,u8 y)
- {
- OLED_WR_Byte(0xb0+y,OLED_CMD);//设置行起始地址
- OLED_WR_Byte(((x&0xf0)>>4)|0x10,OLED_CMD);
- OLED_WR_Byte((x&0x0f),OLED_CMD);
- }
- //x0,y0:起点坐标
- //x1,y1:终点坐标
- //BMP[]:要写入的图片数组
- void OLED_ShowPicture(u8 x0,u8 y0,u8 x1,u8 y1,u8 BMP[])
- {
- u32 j=0;
- u8 x=0,y=0;
- if(y%8==0)y=0;
- else y+=1;
- for(y=y0;y
- {
- OLED_WR_BP(x0,y);
- for(x=x0;x
- {
- OLED_WR_Byte(BMP[j],OLED_DATA);
- j++;
- }
- }
- }
- //OLED的初始化
- void OLED_Init(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能A端口时钟
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//速度50MHz
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- GPIO_SetBits(GPIOA,GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5);
- OLED_RST_Clr();//复位
- Delay_Ms(20);
- OLED_RST_Set();
- OLED_WR_Byte(0xAE,OLED_CMD);//--turn off oled panel
- OLED_WR_Byte(0x00,OLED_CMD);//---set low column address
- OLED_WR_Byte(0x10,OLED_CMD);//---set high column address
- OLED_WR_Byte(0x40,OLED_CMD);//--set start line address Set Mapping RAM Display Start Line (0x00~0x3F)
- OLED_WR_Byte(0x81,OLED_CMD);//--set contrast control register
- OLED_WR_Byte(0xCF,OLED_CMD);// Set SEG Output Current Brightness
- OLED_WR_Byte(0xA1,OLED_CMD);//--Set SEG/Column Mapping 0xa0左右反置 0xa1正常
- OLED_WR_Byte(0xC8,OLED_CMD);//Set COM/Row Scan Direction 0xc0上下反置 0xc8正常
- OLED_WR_Byte(0xA6,OLED_CMD);//--set normal display
- OLED_WR_Byte(0xA8,OLED_CMD);//--set multiplex ratio(1 to 64)
- OLED_WR_Byte(0x3f,OLED_CMD);//--1/64 duty
- OLED_WR_Byte(0xD3,OLED_CMD);//-set display offset Shift Mapping RAM Counter (0x00~0x3F)
- OLED_WR_Byte(0x00,OLED_CMD);//-not offset
- OLED_WR_Byte(0xd5,OLED_CMD);//--set display clock divide ratio/oscillator frequency
- OLED_WR_Byte(0x80,OLED_CMD);//--set divide ratio, Set Clock as 100 Frames/Sec
- OLED_WR_Byte(0xD9,OLED_CMD);//--set pre-charge period
- OLED_WR_Byte(0xF1,OLED_CMD);//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
- OLED_WR_Byte(0xDA,OLED_CMD);//--set com pins hardware configuration
- OLED_WR_Byte(0x12,OLED_CMD);
- OLED_WR_Byte(0xDB,OLED_CMD);//--set vcomh
- OLED_WR_Byte(0x40,OLED_CMD);//Set VCOM Deselect Level
- OLED_WR_Byte(0x20,OLED_CMD);//-Set Page Addressing Mode (0x00/0x01/0x02)
- OLED_WR_Byte(0x02,OLED_CMD);//
- OLED_WR_Byte(0x8D,OLED_CMD);//--set Charge Pump enable/disable
- OLED_WR_Byte(0x14,OLED_CMD);//--set(0x10) disable
- OLED_WR_Byte(0xA4,OLED_CMD);// Disable Entire Display On (0xa4/0xa5)
- OLED_WR_Byte(0xA6,OLED_CMD);// Disable Inverse Display On (0xa6/a7)
- OLED_WR_Byte(0xAF,OLED_CMD);
- OLED_Clear();
- }
复制代码
main.c - #include "debug.h"
- #include "gpio.h"
- #include "oled.h"
- #include "adc.h"
- /* Global typedef */
- char tjcstr[80];
- uint16_t adc_value;
- /* Global define */
- /* Global Variable */
- /*********************************************************************
- * @fn main
- *
- * [url=home.php?mod=space&uid=2666770]@Brief[/url] Main program.
- *
- * [url=home.php?mod=space&uid=1141835]@Return[/url] none
- */
- int main(void)
- {
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
- Delay_Init();
- USART_Printf_Init(115200);
- printf("SystemClk:%drn",SystemCoreClock);
- printf("This is printf examplern");
- MX_GPIO_Init();
- OLED_Init();
- OLED_ColorTurn(0);//0正常显示,1 反色显示
- OLED_DisplayTurn(0);//0正常显示 1 屏幕翻转显示
- OLED_Refresh();
- MX_ADC_Init();
- while(1)
- {
- adc_value=4096-Get_ADC_Val(ADC_Channel_0);
- sprintf(tjcstr,"%d",adc_value);
- OLED_ShowString(12,8,(u8 *)"ADC",24);
- OLED_ShowString(36,32,(u8 *)tjcstr,24);
- Delay_Ms(200);
- OLED_Refresh();
- GPIO_SetBits(GPIOD, GPIO_Pin_10);
- if(adc_value>=3000)
- {
- GPIO_SetBits(GPIOD, GPIO_Pin_10);
- Delay_Ms(50);
- GPIO_ResetBits(GPIOD, GPIO_Pin_10);
- Delay_Ms(50);
- }
- }
- }
复制代码实现效果 源代码
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