Subversion Repositories openmsp430

/*

see README.txt for details.

chris <cliechti@gmx.net>

*/

#include "hardware.h"

#include <stdlib.h>

#include <stdio.h>

#include "swuart.h"

#include "fll.h"

/**

Delay function.

*/

void delay(unsigned int d) {

   while(d--) {

      nop();

      nop();

   }

}

/**

Main function with init an an endless loop that is synced with the

interrupts trough the lowpower mode.

*/

int main(void) {

    int reading = 0;

    int pos = 0;

    char buf[40];

    int led = 0;

    WDTCTL = WDTCTL_INIT;               //Init watchdog timer

    P1OUT  = P1OUT_INIT;                //Init output data of port1

    P1SEL  = P1SEL_INIT;                //Select port or module -function on port1

    P1DIR  = P1DIR_INIT;                //Init port direction register of port1

    P1IES  = P1IES_INIT;                //init port interrupts

    P1IE   = P1IE_INIT;

    P2OUT  = P2OUT_INIT;                //Init output data of port2

    P2SEL  = P2SEL_INIT;                //Select port or module -function on port2

    P2DIR  = P2DIR_INIT;                //Init port direction register of port2

    P2IES  = P2IES_INIT;                //init port interrupts

    P2IE   = P2IE_INIT;

    P3DIR  = 0xff;

    P3OUT  = 0xff;                      //light LED during init

    delay(65535);                       //Wait for watch crystal startup

    delay(65535);

//  fllInit();                          //Init FLL to desired frequency using the 32k768 cystal as reference.

    P3OUT  = 0x00;                      //switch off LED

    TACTL  = TACTL_AFTER_FLL;           //setup timer (still stopped)

    CCTL0  = CCIE|CAP|CM_2|CCIS_1|SCS;  //select P2.2 with UART signal

    CCTL1  = 0;                         //

    CCTL2  = 0;                         //

    TACTL |= MC1;                       //start timer

    eint();                             //enable interrupts

    printf("\r\n====== openMSP430 in action ======\r\n");   //say hello

    printf("\r\nSimple Line Editor Ready\r\n");   //say hello

    while (1) {                         //main loop, never ends...

        printf("> ");                   //show prompt

        reading = 1;

        while (reading) {               //loop and read characters

            LPM0;                       //sync, wakeup by irq

            led++;                      // Some lighting...

            if (led==9) {

              led = 0;

            }

            P3OUT = (0x01 << led);

            switch (rxdata) {

                //process RETURN key

                case '\r':

                //case '\n':

                    printf("\r\n");     //finish line

                    buf[pos++] = 0;     //to use printf...

                    printf(":%s\r\n", buf);

                    reading = 0;        //exit read loop

                    pos = 0;            //reset buffer

                    break;

                //backspace

                case '\b':

                    if (pos > 0) {      //is there a char to delete?

                        pos--;          //remove it in buffer

                        putchar('\b');  //go back

                        putchar(' ');   //erase on screen

                        putchar('\b');  //go back

                    }

                    break;

                //other characters

                default:

                    //only store characters if buffer has space

                    if (pos < sizeof(buf)) {

                        putchar(rxdata);     //echo

                        buf[pos++] = rxdata; //store

                    }

            }

        }

    }

}