software/main.c

   1 /*
   2 see README.txt for details.
   3
   4 original by: chris <cliechti@gmx.net>
   5
   6 modified by: Vladimir Burian <buriavl2@fel.cvut.cz>
   7 */
   8 #include "hardware.h"
   9 #include <stdlib.h>
  10 #include <stdio.h>
  11 #include "swuart.h"
  12 #include "fll.h"
  13
  14 /**
  15 QuadCounter value
  16 */
  17 inline uint32_t qcount() {
  18   uint32_t result = 0;
  19
  20   result |= QCNTL;
  21   result |= ((uint32_t)QCNTH << 16);
  22
  23   return result;
  24 }
  25
  26 /**
  27 Delay function.
  28 */
  29 void delay(unsigned int d) {
  30    while(d--) {
  31       nop();
  32       nop();
  33    }
  34 }
  35
  36 /**
  37 Main function with init an an endless loop that is synced with the
  38 interrupts trough the lowpower mode.
  39 */
  40 int main(void) {
  41     int reading = 0;
  42     int pos = 0;
  43     char buf[40];
  44     int led = 0;
  45
  46     WDTCTL = WDTCTL_INIT;               //Init watchdog timer
  47
  48     P1OUT  = P1OUT_INIT;                //Init output data of port1
  49     P1SEL  = P1SEL_INIT;                //Select port or module -function on port1
  50     P1DIR  = P1DIR_INIT;                //Init port direction register of port1
  51     P1IES  = P1IES_INIT;                //init port interrupts
  52     P1IE   = P1IE_INIT;
  53
  54     P2OUT  = P2OUT_INIT;                //Init output data of port2
  55     P2SEL  = P2SEL_INIT;                //Select port or module -function on port2
  56     P2DIR  = P2DIR_INIT;                //Init port direction register of port2
  57     P2IES  = P2IES_INIT;                //init port interrupts
  58     P2IE   = P2IE_INIT;
  59
  60     P3DIR  = 0xff;
  61     P3OUT  = 0xff;                      //light LED during init
  62     delay(65535);                       //Wait for watch crystal startup
  63     delay(65535);
  64 //  fllInit();                          //Init FLL to desired frequency using the 32k768 cystal as reference.
  65     P3OUT  = 0x00;                      //switch off LED
  66
  67     TACTL  = TACTL_AFTER_FLL;           //setup timer (still stopped)
  68     CCTL0  = CCIE|CAP|CM_2|CCIS_1|SCS;  //select P2.2 with UART signal
  69     CCTL1  = 0;                         //
  70     CCTL2  = 0;                         //
  71     TACTL |= MC1;                       //start timer
  72
  73     eint();                             //enable interrupts
  74
  75     printf("\r\n====== openMSP430 in action ======\r\n");   //say hello
  76     printf("\r\nSimple Line Editor Ready\r\n");   //say hello
  77
  78     printf("\n[QCount = 0x%08lX]\n", qcount());
  79
  80     while (1) {                         //main loop, never ends...
  81         printf("> ");                   //show prompt
  82         reading = 1;
  83         while (reading) {               //loop and read characters
  84             LPM0;                       //sync, wakeup by irq
  85
  86             led++;                      // Some lighting...
  87             if (led==9) {
  88               led = 0;
  89             }
  90             P3OUT = (0x01 << led);
  91
  92             switch (rxdata) {
  93                 //process RETURN key
  94                 case '\r':
  95                 //case '\n':
  96                     printf("\r\n");     //finish line
  97                     buf[pos++] = 0;     //to use printf...
  98                     printf(":%s\r\n", buf);
  99                     reading = 0;        //exit read loop
 100                     pos = 0;            //reset buffer
 101                     break;
 102                 //backspace
 103                 case '\b':
 104                     if (pos > 0) {      //is there a char to delete?
 105                         pos--;          //remove it in buffer
 106                         putchar('\b');  //go back
 107                         putchar(' ');   //erase on screen
 108                         putchar('\b');  //go back
 109                     }
 110                     break;
 111                 //other characters
 112                 default:
 113                     //only store characters if buffer has space
 114                     if (pos < sizeof(buf)) {
 115                         putchar(rxdata);     //echo
 116                         buf[pos++] = rxdata; //store
 117                     }
 118             }
 119         }
 120     }
 121 }
 122