Subversion Repositories openmsp430

#include "hardware.h"

#include <stdlib.h>

#include <stdio.h>

//--------------------------------------------------//

//                   Delay function                 //

//--------------------------------------------------//

void delay(unsigned int d) {

   while(d--) {

      nop();

      nop();

   }

}

//--------------------------------------------------//

//                 putChar function                 //

//            (Send a byte to the UART)             //

//--------------------------------------------------//

int putchar (int txdata) {

  // Wait until the TX buffer is not full

  while (UART_STAT & UART_TX_FULL);

  // Write the output character

  UART_TXD = txdata;

  return 0;

}

//--------------------------------------------------//

//        UART RX interrupt service routine         //

//         (receive a byte from the UART)           //

//--------------------------------------------------//

volatile char rxdata;

wakeup interrupt (UART_RX_VECTOR) INT_uart_rx(void) {

  // Read the received data

  rxdata = UART_RXD;

  // Clear the receive pending flag

  UART_STAT = UART_RX_PND;

  // Exit the low power mode

  LPM0_EXIT;

}

//--------------------------------------------------//

// 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 = WDTPW | WDTHOLD;           // Init watchdog timer

    P3DIR  = 0xff;

    P3OUT  = 0xff;                      // Light LED during init

    UART_BAUD = BAUD;                   // Init UART

    UART_CTL  = UART_EN | UART_IEN_RX;

    //    delay(65535);                       // Some delay

    //delay(65535);

    P3OUT  = 0x00;                      // Switch off LED

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

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

    eint();                             // Enable interrupts

    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

                    }

            }

        }

    }

}