The digital tube of this learning board uses P0 to display the strokes, and P2 to select each word.
Reference address：MCU program 3, digital tube displays 0-9 self-test
#include
#include
unsigned char data dis_digit;
unsigned char code dis_code[11] =
{0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0xFF}; //Common anode digital tube
unsigned char data dis_buf[10];
unsigned char data dis_index;
unsigned char i = 0, j = 0;
void main(void)
{
unsigned char i;
P0 = 0xFF;
P2 = 0xFF;
TMOD = 1;
TH0
TL0
IE
for(i=0;i<=9;i++)
{
dis_buf[i] = dis_code[i];
}
dis_digit = 0xFE;
dis_index = 0;
TR0 = 1;
while(1);
}
void timer0() interrupt 1
//Timer 0 interrupt service routine, used for dynamic scanning of digital tubes
//dis_index--display index, used to identify the offset of the current digital tube and buffer
//dis_gigit--bit selection channel, transmitted to P2 port to select the current digital tube value, such as 0xFE to select the P2.0 port digital tube
//dis_buf--display buffer base address
{
TH0 = 0xFC;
TL0 = 0x17;
P2 = 0xFF; //Turn off all digital tubes first
P0 = dis_buf[dis_index];
P2 = dis_digit;
dis_digit = _crol_(dis_digit, 1); //Shift the bit selection channel to the left, and select the next digital tube at the next interrupt
i++;
if (i==100)
{
j++;
i = 0;
if (j == 5)
{
dis_index++;
if (dis_index == 10)
{
dis_index = 0;
}
i = 0;
j = 0;
}
}
//dis_index &= 0x07; //All 8 digital tubes have been scanned, restart
}
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