MSP430 C Code Examples from Class

MSP430 Assembly Code Examples from Class

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Addressing Modes Demo from Class

#include <msp430.h> 

/*
 * Copy this program, debug it, view the disassembly, and note how the addressing modes work. 
 * main.c
 */
int dog = 2;
int cat;
char table[4] = {119,120,121,122}; // 'w','x','y','z' is 119(0x77),120 (0x78), 121 (0x79), 122(0x7A) in ascii
char* cow;
int main(void) {
    WDTCTL = WDTPW | WDTHOLD;	// Stop watchdog timer
	cat = dog;
	cat = table[dog];
	cow = table;
	cat = *cow++;
	cat = *cow;
	return 0;
}

Recursion Example (Fibonacci Numbers)

Don't forget to use mps instead of mspx in your compiler options. It makes the disassembly use only msp instead of mspx instructions. The small memory model is probably also a good idea.

#include <msp430.h> 

int Fibonacci(int);
/*
 * main.c
 */
int main(void) {
   WDTCTL = WDTPW | WDTHOLD;	// Stop watchdog timer

   int n, i = 0, c, F[10];

   n=4;

   for ( c = 1 ; c <= n ; c++ )
   {
      F[i] = Fibonacci(i);
      i++;
   }

   return 0;
}

int Fibonacci(int n)
{
   if ( n == 0 )
      return 0;
   else if ( n == 1 )
      return 1;
   else
      return ( Fibonacci(n-1) + Fibonacci(n-2) );
}