设计要求：
用七段数码管显示数字0~9
（代码来源于指导书）
#include
void cct_init(void);
void delay(int);
void DisplayOn7Segment(char);
int main(void)
{
char ch = '0'; // Character to be displayed on 7seg
cct_init(); // Make all ports zero
while(1)
{
DisplayOn7Segment(ch); // Display ch on 7seg
delay(30000); // About 1 sec delay
switch(ch) // Update ch with new value to be displayed
{
case '0': ch = '1'; break;
case '1': ch = '2'; break;
case '2': ch = '3'; break;
case '3': ch = '4'; break;
case '4': ch = '5'; break;
case '5': ch = '6'; break;
case '6': ch = '7'; break;
case '7': ch = '8'; break;
case '8': ch = '9'; break;
case '9': ch = '0'; break;
default: ch = '0'; break;
}
}
}
void cct_init(void)
{
P0 = 0x00;
P1 = 0x00;
P2 = 0x00;
P3 = 0x00;
}
void delay(int a)
{
int i;
for(i=0;i}
void DisplayOn7Segment(char ch) // ch can have a value from '0' to 'F' only
{
switch(ch)
{
case '0': P2 = 0x3F; break;
case '1': P2 = 0x06; break;
case '2': P2 = 0x5B; break;
case '3': P2 = 0x4F; break;
case '4': P2 = 0x66; break;
case '5': P2 = 0x6D; break;
case '6': P2 = 0x7D; break;
case '7': P2 = 0x07; break;
case '8': P2 = 0x7F; break;
case '9': P2 = 0x6F; break;
default: P2 = 0x3F; break;
}
}
以上为共阴极
然后共阳极的不确定对不对，但是能运行，仅供参考吧
放一下代码，只是更改了一些数值，生成的hex文件还是可以用的
#include
void cct_init(void);
void delay(int);
void DisplayOn7Segment(char);
int main(void)
{
char ch = '0'; // Character to be displayed on 7seg
cct_init(); // Make all ports zero
while(1)
{
DisplayOn7Segment(ch); // Display ch on 7seg
delay(30000); // About 1 sec delay
switch(ch) // Update ch with new value to be displayed
{
case '0': ch = '1'; break;
case '1': ch = '2'; break;
case '2': ch = '3'; break;
case '3': ch = '4'; break;
case '4': ch = '5'; break;
case '5': ch = '6'; break;
case '6': ch = '7'; break;
case '7': ch = '8'; break;
case '8': ch = '9'; break;
case '9': ch = '0'; break;
default: ch = '0'; break;
}1
}
}
void cct_init(void)
{
P0 = 0x00;
P1 = 0x00;
P2 = 0x00;
P3 = 0x00;
}
void delay(int a)
{
int i;
for(i=0;i}
void DisplayOn7Segment(char ch) // ch can have a value from '0' to 'F' only
{
switch(ch)
{
case '0': P2 = 0xC0; break;
case '1': P2 = 0xF9; break;
case '2': P2 = 0xA4; break;
case '3': P2 = 0xB0; break;
case '4': P2 = 0x99; break;
case '5': P2 = 0x92; break;
case '6': P2 = 0x82; break;
case '7': P2 = 0xF8; break;
case '8': P2 = 0x80; break;
case '9': P2 = 0x90; break;
default: P2 = 0xC0; break;
}
}
大概就是这个样子吧
