Micro tutorials for microcontrollers

MSP430G2553 programming with a Hello World code. C++ on IAR Embedded Workbench. 

Code here:

// Basic MSP430 Hello World 

#include "msp430G2553.h"

#define G_LED BIT6
#define R_LED BIT0

int i,j,delay;

void delay_time(int);
void delay_long(int);

void main(void){
WDTCTL = WDTPW + WDTHOLD; // disable watch dog timer
DCOCTL = CALDCO_16MHZ;    // set internal oscillator at 16MHz
BCSCTL1 = CALBC1_16MHZ;   // set internal oscillator at 16MHz

P1OUT = 0x00;
P2OUT = 0x00;
P1DIR = 0xFF; // Set all as outputs
P2DIR = 0xFF; // Set all as outputs

    for(;;) {
                 
       
    P1OUT |= G_LED;      // Enable = 1                  
    delay_long(delay); 
    P1OUT &= ~(G_LED);   // Disable = 0   
    delay_long(delay);                                  
    }                                 
}

//----------------------------------------------------------------------------------------------------------------------------------
//-----------------  Functions & Procedures  -----------  Functions & Procedures  -----------  Functions & Procedures  -------------
//----------------------------------------------------------------------------------------------------------------------------------

void delay_time (int delay){      //----------------------------------------- Delay---------------------
      
     do delay--;
     while (delay != 0);
}

void delay_long (int){            //--------------------------------------- Delay long------------------

            int j;                   
            j = 100;
         do{ 
            delay_time(5000);
         j--;
         }while (j != 0); 
}

Programming a PIC16F628 microcontroller using MPLABX and PICkit3 - A Hello World Program demonstrating the basic principles of writing a piece of ASM code. The LEDs on the PORTB are lighting up according to some pressed buttons on the PORTA used as an input here.

For details about the hardware used in this video, refer to the following website: www.funelectronicstoday.com

The result code, in case you want to copy-paste it:

; Hello world basic 16F628 ASM program
 
 RESET CODE 0x00
 #INCLUDE P16F628A.inc ; put angle brackets here
 __CONFIG _HS_OSC & _CP_OFF & _LVP_OFF & _BODEN_OFF & _MCLRE_ON & _PWRTE_OFF & _WDT_OFF 
 
 ; THIS PROGRAM WAS DESIGNED FOR 20 MHZ OSC
 ;------------------------------------
 ;_XT_OSC             : EXTERNAL 4MHZ
 ;_HS_OSC             : EXTERNAL 20MHZ
 ;_INTRC_OSC_NOCLKOUT : INTERNAL 4MHZ
 ;------------------------------------
 
 CBLOCK 0X20 ; THIS IS HOW YOU DECLARE A BLOCK OF VARIABLES
    NVAR1, NVAR2
 ENDC
 
 CLRF PORTA ;SET THESE PINS BEFORE YOU ACTUALLY CONFIGURE THEM
 CLRF PORTB
 
 MOVLW 0X07    ; DISABLE THE COMPARATORS AND ENABLING THE PINS FOR
 MOVWF CMCON   ; FUNCTIONING AS I-O

 
 
 
 
 
 BCF STATUS, RP1 ;SETS BANK1
 BSF STATUS, RP0 ;
 
 MOVLW B'00111111' ;SET PINS 0 - 4 AS INPUTS ; TRIS 5 AS 1 ALWAYS  
 MOVWF TRISA 
 
 MOVLW 0X00 ;SET PINS 0 - 7 AS OUTPUTS
 MOVWF TRISB 
 
 BCF STATUS, RP1 ;SETS BANK1
 BCF STATUS, RP0 ;
 
 
;MAIN LOOP----------------

REPEAT
 
 MOVFW PORTA
 MOVWF NVAR1
 
 MOVFW NVAR1
 MOVWF PORTB
 
 GOTO REPEAT ; END OF MAIN LOOP 
 
 END

In the previous videos I've been explaining how to initialize the ports of the PIC16f628 microcontroller. This other video shows how to write a delay loop and blink some LEDs for fun. The code of the main loop and of the delay loop is listed below in case you want to copy-paste it:  Check also funelectronicstoday.com for more fun projects.

;MAIN LOOP----------------

REPEAT
    MOVLW 0X00
    MOVWF PORTB
    CALL DELAY 
 
    MOVLW 0X01
    MOVWF PORTB
    CALL DELAY
    
    MOVLW 0X02
    MOVWF PORTB
    CALL DELAY
    
    MOVLW 0X04
    MOVWF PORTB
    CALL DELAY
    
    MOVLW 0X08
    MOVWF PORTB
    CALL DELAY
    
    CLRF PORTB 
    
    CALL DELAY

     
 
 GOTO REPEAT ; END OF MAIN LOOP 
 

DELAY
 CLRF DELAY1
 CLRF DELAY2

DELAYLOOP 
 DECFSZ DELAY2,F
 GOTO DELAYLOOP
 
 DECFSZ DELAY1,F
 GOTO DELAYLOOP
 
 
 RETURN