STM32電阻檢測儀制作資料含源碼(參加校賽作品分享)

ID:275479 · 發表于 2018-6-2 18:20

參考正點原子的T9拼音輸入和輸入捕獲來做的測占空比和觸摸屏，通過被測電阻影響555定時器的產生的方波占空比來測量電阻，僅需要一個555定時器，不需要選擇電路，即可測量0-10M的電阻，并且精度能達到2%。在實際的制作中還有很多的注意事項，大家可以不斷摸索嘗試。

制作出來的實物圖如下：

電路原理圖如下：

STM32單片機源程序如下:

#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "lcd.h"
#include "key.h"
#include "malloc.h"
#include "sdio_sdcard.h"
#include "w25qxx.h"
#include "ff.h"
#include "exfuns.h"
#include "text.h"
#include "pyinput.h"
#include "touch.h"
#include "string.h"
#include "usmart.h"
#include "timer.h"
#include <math.h>
//數字表
const u8* kbd_tbl[12]={"1","2","3","4","5","6","7","8","9",".","0","確認",};
//字符表
const u8* kbs_tbl[9]={" "," "," "," "," "," "," "," "," ",};
u16 kbdxsize; //虛擬鍵盤按鍵寬度
u16 kbdysize; //虛擬鍵盤按鍵高度
extern u16 TIM5CH1_CAPTURE_STA; //輸入捕獲狀態
extern u16 countH,countL;
extern u16 TIM5CH1_CAPTURE_VAL,TIM5CH1_CAPTURE_VAL1; //輸入捕獲值
long double res,res1;
long double x1,x2,x3,x4,x5,x6,x7;
//加載鍵盤界面
//x,y:界面起始坐標
void py_load_ui(u16 x,u16 y)
{
u16 i;
POINT_COLOR=RED;
LCD_DrawRectangle(x,y,x+kbdxsize*3,y+kbdysize*4);
LCD_DrawRectangle(x,y,x+kbdxsize*3,y+kbdysize*1);
LCD_DrawRectangle(x,y,x+kbdxsize*3,y+kbdysize*2);
LCD_DrawRectangle(x,y,x+kbdxsize*3,y+kbdysize*3);
LCD_DrawRectangle(x,y,x+kbdxsize*1,y+kbdysize*4);
LCD_DrawRectangle(x,y,x+kbdxsize*2,y+kbdysize*4);
POINT_COLOR=BLUE;
for(i=0;i<12;i++)
{
Show_Str_Mid(x+(i%3)*kbdxsize,y+4+kbdysize*(i/3),(u8*)kbd_tbl[i],16,kbdxsize);
// Show_Str_Mid(x+(i%3)*kbdxsize,y+kbdysize/2+kbdysize*(i/3),(u8*)kbs_tbl[i],16,kbdxsize);
}
}
//按鍵狀態設置
//x,y:鍵盤坐標
//key:鍵值（0~8）
//sta:狀態，0，松開；1，按下；
void py_key_staset(u16 x,u16 y,u8 keyx,u8 sta)
{
u16 i=keyx/3,j=keyx%3;
printf("%d %d %d\r\n",keyx,i,j);
if(keyx>12)return;
if(sta)LCD_Fill(x+j*kbdxsize+1,y+i*kbdysize+1,x+j*kbdxsize+kbdxsize-1,y+i*kbdysize+kbdysize-1,GREEN);
else LCD_Fill(x+j*kbdxsize+1,y+i*kbdysize+1,x+j*kbdxsize+kbdxsize-1,y+i*kbdysize+kbdysize-1,WHITE);
Show_Str_Mid(x+j*kbdxsize,y+4+kbdysize*i,(u8*)kbd_tbl[keyx],16,kbdxsize);
Show_Str_Mid(x+j*kbdxsize,y+kbdysize/2+kbdysize*i,(u8*)kbs_tbl[keyx],16,kbdxsize);
}
//得到觸摸屏的輸入
//x,y:鍵盤坐標
//返回值：按鍵鍵值（1~9有效；0,無效）
u8 py_get_keynum(u16 x,u16 y)
{
u16 i,j;
static u8 key_x=0;//0,沒有任何按鍵按下；1~9，1~9號按鍵按下
u8 key=0;
tp_dev.scan(0);
if(tp_dev.sta&TP_PRES_DOWN) //觸摸屏被按下
{
for(i=0;i<4;i++)
{
for(j=0;j<3;j++)
{
if(tp_dev.x[0]<(x+j*kbdxsize+kbdxsize)&&tp_dev.x[0]>(x+j*kbdxsize)
&&tp_dev.y[0]<(y+i*kbdysize+kbdysize)&&tp_dev.y[0]>(y+i*kbdysize))
{
key=i*3+j+1;
break;
}
}
if(key)
{
if(key_x==key)key=0;
else
{
py_key_staset(x,y,key_x-1,0);
key_x=key;
py_key_staset(x,y,key_x-1,1);
}
break;
}
}
}else if(key_x)
{
py_key_staset(x,y,key_x-1,0);
key_x=0;
}
// printf( "%d \r\n",key_x);
return key;
}
//顯示結果.
//index:0,表示沒有一個匹配的結果.清空之前的顯示
// 其他,索引號
void py_show_result(u8 index)
{
LCD_ShowNum(30+144,125,index,1,16); //顯示當前的索引
LCD_Fill(30+40,125,30+40+48,130+16,WHITE); //清除之前的顯示
LCD_Fill(30+40,145,lcddev.width,145+48,WHITE);//清除之前的顯示
if(index)
{
// Show_Str(30+40,125,200,16,t9.pymb[index-1]->py,16,0); //顯示拼音
// Show_Str(30+40,145,lcddev.width-70,48,t9.pymb[index-1]->pymb,16,0);//顯示對應的漢字
//
}
}
int main(void)
{
u16 i,flag;
u16 i1,j1;
u8 lcd_id[12]; //存放LCD ID字符串
u8 buf[12]={0};
double temp=0, temp1=0;
// double f;
long double duty,duty1,pingjun;
u8 result_num;
u8 cur_index;
u8 key;
u8 inputstr[7]; //最大輸入6個字符+結束符
u8 inputlen; //輸入長度
uart_init(115200); //串口初始化為115200
delay_init(); //延時函數初始化
LED_Init(); //初始化與LED連接的硬件接口
KEY_Init(); //初始化按鍵
LCD_Init(); //初始化LCD
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//設置中斷優先級分組為組2：2位搶占優先級，2位響應優先級
TIM5_Cap_Init(0XFFFF,1-1); //以72Mhz的頻率計數
usmart_dev.init(72); //初始化USMART
W25QXX_Init(); //初始化W25Q128
tp_dev.init(); //初始化觸摸屏
my_mem_init(SRAMIN); //初始化內部內存池
exfuns_init(); //為fatfs相關變量申請內存
f_mount(fs[0],"0:",1); //掛載SD卡
f_mount(fs[1],"1:",1); //掛載FLASH.
POINT_COLOR=RED;
while(font_init()) //檢查字庫
{
LCD_ShowString(30,50,200,16,16,"Font Error!");
delay_ms(200);
LCD_Fill(30,50,240,66,WHITE);//清除顯示
}
RESTART:
POINT_COLOR=RED;
Show_Str(30,5,200,16,"被測阻值大小：",16,0);
Show_Str(30,65,200,16,"輸入目標阻值: ",16,0);
Show_Str(30,85,200,16,"輸入目標誤差: ",16,0);
if(lcddev.id==0X5310){kbdxsize=86;kbdysize=43;}//根據LCD分辨率設置按鍵大小
else if(lcddev.id==0X5510||lcddev.id==0X1963){kbdxsize=140;kbdysize=70;}
else {kbdxsize=60;kbdysize=40;}
py_load_ui(30,150);
memset(inputstr,0,7); //全部清零
inputlen=0; //輸入長度為0
result_num=0; //總匹配數清零
cur_index=0;
while(1)
{
for(i=0;i<30;i++)
{
tp_dev.scan(0);
while((TIM5CH1_CAPTURE_STA&0X0400)==0&&(tp_dev.sta&TP_PRES_DOWN)==0)
{
}
if(TIM5CH1_CAPTURE_STA&0X0400)//成功捕獲到了一次上升沿
{
TIM_Cmd(TIM5,DISABLE ); //停止使能定時器5
temp=countH&0XFFFF;
temp*=65536;//溢出時間總和
temp+=TIM5CH1_CAPTURE_VAL;//得到總的高電平時間
temp1=countL&0XFFFF;
temp1*=65536;//溢出時間總和
temp1+=TIM5CH1_CAPTURE_VAL1;//得到總的高電平時間
duty=temp/(temp+temp1);
}
pingjun=pingjun+duty;
TIM5CH1_CAPTURE_STA=0x0000;//開啟下一次捕獲
TIM_Cmd(TIM5,ENABLE ); //使能定時器5
countH=0;
countL=0;
if(duty>0.998)
{
i=i+30;
pingjun=duty*30;
}
}
TIM_Cmd(TIM5,ENABLE ); //停止使能定時器5
duty1=pingjun/30;
pingjun=0;
x1=duty1;x2=duty1;x3=duty1; x4=duty1; x5=duty1; x6=duty1; x7=duty1;
x1=pow(x1,1);x2=pow(x2,2);x3=pow(x3,3);x4=pow(x4,4);x5=pow(x5,5);
x6=pow(x6,6);x7=pow(x7,7);
POINT_COLOR=RED;
if(0.5<duty1&&duty1<0.73)
{
res= -14302041012.00000000000000000000 *x6
+ 58769808162.38000000000000000000 *x5
- 100611696743.20400000000000000000* x4
+ 91852454672.19220000000000000000 *x3
- 47163395469.91170000000000000000 *x2
+ 12914204844.35510000000000000000 *x1
- 1473223936.77019000000000000000 ;
if(res<0)
{res=0;}
if(res<10&&res>0)
{
sprintf((char*)buf,"%s%.0f%s ","00",res," ohm ");
}
else if(res>10&&res<100)
{sprintf((char*)buf,"%.1f%s ",res," ohm ");}
else
sprintf((char*)buf,"%.0f%s ",res," ohm ");//將LCD ID打印到lcd_id數組。
}
else if(0.73<duty1&&duty1<0.88)
{
x1=duty1;x2=duty1;x3=duty1; x4=duty1; x5=duty1; x6=duty1; x7=duty1;
x1=pow(x1,1);x2=pow(x2,2);x3=pow(x3,3);x4=pow(x4,4);x5=pow(x5,5);
x6=pow(x6,6);x7=pow(x7,7);
res= 50576272.31250000000000000000* x6
- 253686059.69843800000000000000 *x5 +
528819351.78510700000000000000 *x4 -
586296731.32720000000000000000 *x3 +
364607758.57319900000000000000 *x2 -
120587778.49805700000000000000* x1 +
16570759.99618540000000000000 ;
if(res>930&&res<1000)
res+=6;
sprintf((char*)buf,"%.0f%s ",res," ohm ");
if(res>=1000)
{
res=res/1000;
sprintf((char*)buf,"%.2f%s ",res," K ohm ");
}
}
else if(0.88<duty1&&duty1<0.985)
{
res = 9886588.40917969000000000000
*x6 - 54523063.81499820000000000000 *x5
+ 125263597.49274900000000000000 *x4
- 153457525.82975900000000000000 *x3
+ 105728501.67596900000000000000 *x2
- 38842842.27736880000000000000 *x1 +
5944747.37332069000000000000 ;
res=res*10;
if(res>10&&res<100)
sprintf((char*)buf,"%.1f%s ",res," K ohm ");
else
sprintf((char*)buf,"%.2f%s ",res," K ohm ");
}
else if(0.9850<duty1&&duty1<0.9980)
{
res = 80085557347.37500000000000000000 *x5
- 395505919886.63800000000000000000 *x4
+ 781284983275.76300000000000000000 *x3
- 771673654310.73900000000000000000 *x2
+ 381088259432.87600000000000000000 *x1
- 75279225837.53090000000000000000 ;
res=res*10;
if(res>20&&res<25)
{res=res-1;}
if(res>30&&res<40)
{res=res+1;}
if(res>55&&res<58)
{res=res-1;}
if(res>58&&res<87)
{res=res-2;}
if(res>87&&res<92)
{res=res-1;}
printf( "%d \r\n",duty1);
printf( "%d \r\n",res);
sprintf((char*)buf,"%.1f%s ",res," K ohm ");
}
else if(duty1>0.9980)
{
duty1=duty1*1000-999;
x1=duty1;
x2=duty1;
x3=duty1;
x4=duty1;
x5=duty1;
x6=duty1;
x7=duty1;
x1=pow(x1,1);x2=pow(x2,2);x3=pow(x3,3);x4=pow(x4,4);x5=pow(x5,5);
x6=pow(x6,6);x7=pow(x7,7);
res = 451698.02975654600000000000 *x5
- 1949941.77138209000000000000 *x4
+ 3364145.37781321000000000000* x3
- 2899364.16821244000000000000* x2
+ 1248232.03533619000000000000* x1
- 214750.16957818900000000000 ;
sprintf((char*)buf,"%.2f%s ",res," M ohm ");
}
key=py_get_keynum(30,150);
if(key)
{
if(key==1)//刪除
{
if(inputlen)inputlen--;
inputstr[inputlen]='\0';//添加結束符
}else
{
inputstr[inputlen]=key+'0';//輸入字符
if(inputlen<7)inputlen++;
}
if(inputstr[0]!=NULL)
{
key=t9.getpymb(inputstr); //得到匹配的結果數
if(key)//有部分匹配/完全匹配的結果
{
result_num=key&0X7F; //總匹配結果
cur_index=1; //當前為第一個索引
if(key&0X80) //是部分匹配
{
inputlen=key&0X7F; //有效匹配位數
inputstr[inputlen]='\0';//不匹配的位數去掉
if(inputlen>1)result_num=t9.getpymb(inputstr);//重新獲取完全匹配字符數
}
}else //沒有任何匹配
{
inputlen--;
inputstr[inputlen]='\0';
}
}else
{
cur_index=0;
result_num=0;
}
// LCD_Fill(30+40,105,30+40+48,110+16,WHITE); //清除之前的顯示
// LCD_ShowNum(30+144,105,result_num,1,16); //顯示匹配的結果數
// Show_Str(30+40,105,200,16,inputstr,16,0); //顯示有效的數字串
// py_show_result(cur_index); //顯示第cur_index的匹配結果
}
key=KEY_Scan(0);
if(result_num) //存在匹配的結果
{
switch(key)
{
case KEY1_PRES://下翻
if(cur_index>1)cur_index--;
else cur_index=result_num;
py_show_result(cur_index); //顯示第cur_index的匹配結果
break;
case KEY0_PRES://清除輸入
LCD_Fill(30+40,145,lcddev.width,145+48,WHITE); //清除之前的顯示
goto RESTART;
}
}
LCD_ShowString(30,35,210,24,24, (u8 *)buf);
TIM5CH1_CAPTURE_STA=0x0000;//開啟下一次捕獲
TIM_Cmd(TIM5,ENABLE ); //使能定時器5
countH=0;
countL=0;
}
}