本帖最后由 rclong 于 2018-7-13 09:00 编辑
问题:数组越界,如3楼所说
解决方法:将数组SMG[7]定义为SMG[8].
感谢诸位.
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最近买了块TM1638方案的数码管+矩阵键盘,写了写代码准备搞和C51联调的培训.
结果在keil C51 uv5里遇到一个怪问题.
代码功能很简单,就是在数码管上显示0~99999999.
把这个整数存在变量number里,一开始用unsigned int型,OK没问题,到65535溢出归0,
改成unsigned long之后,编译也没有错误也没有警告,但是烧进去数码管就始终黑屏.
百思不得其解,还得请各位多多指点.
- //part04.以下是数码管显示,主要是尝试动态刷新数码管.
- //存在问题:number为unsigned long 型数据时代码不工作,调试后发现void number_display(unsigned int number)这一函数不工作,具体原因未知.2018年7月11日 15:04:36
- #include <reg52.h>
- //变量与表
- unsigned char code tab[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,0x40,0xef,0x00};//共阴极数码管译码表.[18]为全熄灭.
- unsigned int number; //数字
- unsigned int timer_counter; //时间计数标记.
- //引脚定义
- sbit DIO=P2^0;
- sbit CLK=P2^1;
- sbit STB=P2^2;
- //函数声明
- void number_add(void);
- void number_display(unsigned int number);
- void led_segment_display(unsigned char ddata0,unsigned char ddata1,unsigned char ddata2,unsigned char ddata3,unsigned char ddata4,unsigned char ddata5,unsigned char ddata6,unsigned char ddata7);
- void Write_COM(unsigned char cmd);
- void TM1638_Write(unsigned char DATA);
- //主函数
- void main(){
- number = 0;
- while(1){
- number_add();
- number_display(number);
- }
- }
- void number_add(void){
- timer_counter = timer_counter + 1; //通过引入timer_counter避免使用delay,从而对数码管动态扫描不构成影响.
- if(timer_counter >= 50){ //调整该常量值可以调整number自加的速度.
- number = number + 199;
- if(number > 99999999)
- number = 0;
- timer_counter = 0;
- }
- else
- timer_counter = timer_counter + 1;
- //P1 = 0xf0;
- }
- void number_display(unsigned int number)
- {
- unsigned int temp_number;
- unsigned char SMG[7],i;
- char j;
- unsigned int lowest_digit; //最低位
- temp_number = number; //整数拆分成各位
- for(i=0;i<8;i++){
- lowest_digit = temp_number%10;//从低位往高位取
- temp_number = temp_number/10;
- SMG[i] = lowest_digit;
- }
- for(j=7;j>-1;j--){
- if(SMG[j]==0){
- SMG[j] = 18;
- }//从高位往低位看,高位为0的就赋18,只到第一个不为零的数出现.
- else
- j = -1;
- }
- led_segment_display(SMG[7],SMG[6],SMG[5],SMG[4],SMG[3],SMG[2],SMG[1],SMG[0]);
- //P1 = 0x0f;
- }
- void led_segment_display(unsigned char ddata0,unsigned char ddata1,unsigned char ddata2,unsigned char ddata3,unsigned char ddata4,unsigned char ddata5,unsigned char ddata6,unsigned char ddata7){
- unsigned char writedata0,writedata1,writedata2,writedata3,writedata4,writedata5,writedata6,writedata7;
- unsigned char data0,data1,data2,data3,data4,data5,data6,data7;
-
- data0=ddata7; //通过调整该部分代码即可调整数据对应数码管位置.
- data1=ddata6;
- data2=ddata5;
- data3=ddata4;
- data4=ddata3;
- data5=ddata2;
- data6=ddata1;
- data7=ddata0;
- writedata0=(tab[data0]&0x01)+((tab[data1]&0x01)<<1)+((tab[data2]&0x01)<<2)+((tab[data3]&0x01)<<3)+((tab[data4]&0x01)<<4)
- +((tab[data5]&0x01)<<5)+((tab[data6]&0x01)<<6)+((tab[data7]&0x01)<<7);
- writedata1=((tab[data0]&0x02)>>1)+((tab[data1]&0x02))+((tab[data2]&0x02)<<1)+((tab[data3]&0x02)<<2)+((tab[data4]&0x02)<<3)
- +((tab[data5]&0x02)<<4)+((tab[data6]&0x02)<<5)+((tab[data7]&0x02)<<6);
- writedata2=((tab[data0]&0x04)>>2)+((tab[data1]&0x04)>>1)+((tab[data2]&0x04))+((tab[data3]&0x04)<<1)+((tab[data4]&0x04)<<2)
- +((tab[data5]&0x04)<<3)+((tab[data6]&0x04)<<4)+((tab[data7]&0x04)<<5);
- writedata3=((tab[data0]&0x08)>>3)+((tab[data1]&0x08)>>2)+((tab[data2]&0x08)>>1)+((tab[data3]&0x08))+((tab[data4]&0x08)<<1)
- +((tab[data5]&0x08)<<2)+((tab[data6]&0x08)<<3)+((tab[data7]&0x08)<<4);
- writedata4=((tab[data0]&0x10)>>4)+((tab[data1]&0x10)>>3)+((tab[data2]&0x10)>>2)+((tab[data3]&0x10)>>1)+((tab[data4]&0x10))
- +((tab[data5]&0x10)<<1)+((tab[data6]&0x10)<<2)+((tab[data7]&0x10)<<3);
- writedata5=((tab[data0]&0x20)>>5)+((tab[data1]&0x20)>>4)+((tab[data2]&0x20)>>3)+((tab[data3]&0x20)>>2)+((tab[data4]&0x20)>>1)
- +((tab[data5]&0x20))+((tab[data6]&0x20)<<1)+((tab[data7]&0x20)<<2);
- writedata6=((tab[data0]&0x40)>>6)+((tab[data1]&0x40)>>5)+((tab[data2]&0x40)>>4)+((tab[data3]&0x40)>>3)+((tab[data4]&0x40)>>2)
- +((tab[data5]&0x40)>>1)+((tab[data6]&0x40))+((tab[data7]&0x40)<<1);
- writedata7=((tab[data0]&0x80)>>7)+((tab[data1]&0x80)>>6)+((tab[data2]&0x80)>>5)+((tab[data3]&0x80)>>4)+((tab[data4]&0x80)>>3)
- +((tab[data5]&0x80)>>2)+((tab[data6]&0x80)>>1)+((tab[data7]&0x80));
- Write_COM(0x8a);//亮度
- Write_COM(0x40); //写 数据命令
- STB=0;
- TM1638_Write(0xc0); //写地址命令
-
- TM1638_Write(writedata0);
- TM1638_Write(0x80);
- TM1638_Write(writedata1);
- TM1638_Write(0x00);
- TM1638_Write(writedata2);
- TM1638_Write(0x00);
- TM1638_Write(writedata3);
- TM1638_Write(0x00);
- TM1638_Write(writedata4);
- TM1638_Write(0x00);
- TM1638_Write(writedata5);
- TM1638_Write(0x00);
- TM1638_Write(writedata6);
- TM1638_Write(0x00);
- TM1638_Write(writedata7);
- TM1638_Write(0x00);
- STB=1;
- }
- void Write_COM(unsigned char cmd){ //发送命令字
- STB=0;
- TM1638_Write(cmd);
- STB=1;
- }
- void TM1638_Write(unsigned char DATA){ //写数据函数
- unsigned char i;
- for(i=0;i<8;i++){
- CLK=0;
- if(DATA&0X01)
- DIO=1;
- else
- DIO=0;
- DATA>>=1;
- CLK=1;
- }
- }
- //存在问题:number为unsigned long 型数据时代码不工作,调试后发现void number_display(unsigned int number)这一函数不工作,具体原因未知.2018年7月11日 15:04:29
- //part04.以上是数码管显示,主要是尝试动态刷新数码管.
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