Here we first need to explain the 138 decoder, which is a chip that I call 3 inputs and 8 outputs.
ABC is the input terminal, so when AB
#include
typedef unsigned int u16;
typedef unsigned char u8;
sbit LSA = P2^0;
sbit LSB = P2^1;
sbit LSC = P2^2; //bit definition
u8 code smgduan [] = {0x3f, 0x06, 0x5b,0x4f, 0x66, 0x6d, 0x7d, 0x07,
0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71}; //0-9 hexadecimal representation
void main()
{
LSA = 0;
LSB = 0;
LSC = 0; //A, B, C output low level, LED1 output low level
P0 = smgduan[0];
When C inputs 0 (low level), Y0 outputs low level, so the first light on the digital tube will be lit.
At this time, the hexadecimal representation of the control digital tube segment is represented by an array. For example, 0x3f represents "0", so after the program design is completed, the first light on the digital tube will display 0.
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