This C code is controlling a 4-digit 7-segment display. It defines arrays to store the digit values and multiplex signals. The main function initializes the display pins as outputs, sets initial display values, and enters a loop to continuously multiplex the display. It checks buttons to increment the values or light all segments. Additional functions read input pins and delay for the multiplexing timing.

1. #include "io430.h"
#include "intrinsics.h"
#define TEMP 1000
unsigned int digitos[10] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned int mudar[10] = {0X04,0X08,0X10,0x20};
//unsigned int mudar[10] = {0B000001,0B000010,0B000100,0B001000};
// 0B0000 0100 0B0000 1000 0B0001 0000 0B0010 0000
// 0000-0001 , 0000-0010, 0000-0100, 0000-1000,
// 0X01, 0X02, 0X04, 0x08
int main(void)
{
// Stop watchdog timer to prevent time out reset
int aguarde(long);
int ler_bit(char a, int b);
WDTCTL = WDTPW + WDTHOLD;
//Configura digitos 1 al 4
P1DIR = 0x7F; // 0111-1111 <- coloca 1 de 0 a 6 e 0 no porta 7
P2DIR = 0xFC; // 1111 - 1100 <-1000
int disp_1 = 0, disp_2 = 0, disp_3 = 0, disp_4 = 0;
while(1){
if((ler_bit(P1IN,7) == 1)){
// while(1)
do{
P2OUT = mudar[0];
P1OUT = digitos[disp_1];
aguarde(TEMP);
P2OUT = mudar[1];
P1OUT = digitos[disp_2];
aguarde(TEMP);
P2OUT = mudar[2];
P1OUT = digitos[disp_3];
aguarde(TEMP);
P2OUT = mudar[3];
P1OUT = digitos[disp_4];
aguarde(TEMP);
disp_1++;
if(disp_1 == 10){
disp_1 = 0;
disp_2++;
} if(disp_2 == 10){
disp_2 = 0;
disp_3++;
}if(disp_3 == 10){
disp_3 = 0;
disp_4++;
}if(disp_4 == 10)
disp_4 = 0;
//}while((ler_bit(P1IN,7))||(ler_bit(P2IN,0))||(ler_bit(P2IN,1)));
}while((ler_bit(P2IN,0))||(ler_bit(P2IN,1)));
//break;
}
if(~((ler_bit(P1IN,7))||(ler_bit(P2IN,0))||(ler_bit(P2IN,1)))){
P2OUT = mudar[0];

2. P1OUT = digitos[disp_1];
aguarde(TEMP);
P2OUT = mudar[1];
P1OUT = digitos[disp_2];
aguarde(TEMP);
P2OUT = mudar[2];
P1OUT = digitos[disp_3];
aguarde(TEMP);
P2OUT = mudar[3];
P1OUT = digitos[disp_4];
aguarde(TEMP);
}
//Mostrar en cada digito un valor
if(ler_bit(P2IN,1)){
// while(1)
do{
P2OUT = mudar[0];
P1OUT = digitos[7];
aguarde(TEMP);
P2OUT = mudar[1];
P1OUT = digitos[6];
aguarde(TEMP);
P2OUT = mudar[2];
P1OUT = digitos[1];
aguarde(TEMP);
P2OUT = mudar[3];
P1OUT = digitos[5];
aguarde(TEMP);
}while((ler_bit(P1IN,7))||(ler_bit(P2IN,0))||(ler_bit(P2IN,1)));
//break;
}
}}
int ler_bit(char a, int b)
{
char var = (1 << b);
if(var == (a & var))
return 1;
else
return 0;
}
int aguarde(long t0)
{
long y=0;
while(y++ < t0);
return 1;
}