MSP430 seven segment LED display CD4511

Using the MSP430 with the CMOS logic chip CD4511 seven segment display/decoder/latch chip.

Source Code:

//  MSP430G2231

// and display on 7 segment display via 4511 decoder/driver

#include  <msp430x20x2.h>

#include <io.h>

#include <signal.h>

#include <stdlib.h>

#include <stdio.h>

static void __inline__delay(register unsigned int n);

void main( void )

int msd, lsd, r1, r2, r3, r4, i, k = 0;

WDTCTL = WDTPW + WDTHOLD;

P1DIR |= 0x3f;

P1SEL = 0x00;

while( 1 )

i++;

if (i > 99) i=0;

r2 = i / 10;

r1 = i - r2 * 10;

msd = r2;

lsd = r1;

P1OUT &= ~BIT4;

P1OUT = (BIT0 & msd) | (BIT1 & msd) | (BIT2 & msd) | (BIT3 & msd) | BIT5;

__inline__delay( 0xff );

P1OUT |= BIT4;

msd = 5;

P1OUT &= ~BIT5;

P1OUT = (BIT0 & lsd) | (BIT1 & lsd) | (BIT2 & lsd) | (BIT3 & lsd) | BIT4;

P1OUT |= BIT5;

__inline__delay(0xFF00);

// Delay Routine from mspgcc help file

static void __inline__delay(register unsigned int n)

  __asm__ __volatile__ (

  "1: \n"

  " dec %[n] \n"

  " jne 1b \n"

        : [n] "+r"(n));