Subversion Repositories openmsp430

#include "omsp_system.h"
#include "hardware.h"
#include <stdlib.h>
#include <stdio.h>
 
//--------------------------------------------------//
//                   Delay function                 //
//--------------------------------------------------//
void delay(unsigned int d) {
   while(d--) {
      __nop();
      __nop();
   }
}
 
//--------------------------------------------------//
//                 tty_putc function                 //
//            (Send a byte to the UART)             //
//--------------------------------------------------//
int tty_putc (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
 
    cprintf("\r\n====== openMSP430 in action ======\r\n");   //say hello
    cprintf("\r\nSimple Line Editor Ready\r\n");
 
    eint();                             // Enable interrupts
 
    while (1) {                         //main loop, never ends...
 
        cprintf("> ");                   //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':
                    cprintf("\r\n");    //finish line
                    buf[pos++] = 0;     //to use cprintf...
                    cprintf(":%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
                        tty_putc('\b');  //go back
                        tty_putc(' ');   //erase on screen
                        tty_putc('\b');  //go back
                    }
                    break;
                //other characters
                default:
                    //only store characters if buffer has space
                    if (pos < sizeof(buf)) {
                        tty_putc(rxdata);     //echo
                        buf[pos++] = rxdata; //store
                    }
            }
        }
    }
}