cpu/avr/dev/clock.c

   1
   2 #include "sys/clock.h"
   3 #include "dev/clock-avr.h"
   4 #include "sys/etimer.h"
   5
   6 #include <avr/io.h>
   7 #include <avr/interrupt.h>
   8
   9 /* RADIOSTATS should be also be defined in the radio driver and webserver */
  10 #if RF230BB && WEBSERVER
  11 #define RADIOSTATS 1
  12 #endif
  13 #if RADIOSTATS
  14 static volatile clock_time_t count, scount, rcount;
  15 volatile unsigned long seconds,radioontime;
  16 extern uint8_t RF230_receive_on;
  17 #else
  18 static volatile clock_time_t count, scount;
  19 volatile unsigned long seconds;
  20 #endif
  21
  22 /*---------------------------------------------------------------------------*/
  23 //SIGNAL(SIG_OUTPUT_COMPARE0)
  24 ISR(AVR_OUTPUT_COMPARE_INT)
  25 {
  26   count++;
  27   if(++scount == CLOCK_SECOND) {
  28     scount = 0;
  29     seconds++;
  30   }
  31 #if RADIOSTATS
  32   if (RF230_receive_on) {
  33     if (++rcount == CLOCK_SECOND) {
  34       rcount=0;
  35       radioontime++;
  36     }
  37   }
  38 #endif
  39   if(etimer_pending()) {
  40     etimer_request_poll();
  41   }
  42 }
  43
  44 /* External clock source does not work ? */
  45 #if 0
  46 void
  47 clock_init(void)
  48 {
  49   cli ();
  50   TIMSK &= ((unsigned char)~(1 << (TOIE0)));
  51   TIMSK &= ((unsigned char)~(1 << (OCIE0)));
  52   /* Disable TC0 interrupt */
  53
  54   /**
  55    *  set Timer/Counter0 to be asynchronous
  56    *  from the CPU clock with a second external
  57    *  clock(32,768kHz)driving it
  58    */
  59   ASSR |= (1 << (AS0));
  60   TCCR0 = _BV (CS02) | _BV (CS01) | _BV (WGM1);
  61
  62   TCNT0 = 0;
  63   OCR0 = 128;
  64
  65   TIMSK |= (1 << (OCIE0));
  66   TIMSK |= (1 << (TOIE0));
  67   sei ();
  68 }
  69 #endif
  70
  71 /*---------------------------------------------------------------------------*/
  72 void
  73 clock_init(void)
  74 {
  75   cli ();
  76
  77
  78   OCRSetup();
  79
  80   /*
  81    * Counts the number of ticks. Since clock_time_t is an unsigned
  82    * 16 bit data type, time intervals of up to 524 seconds can be
  83    * measured.
  84    */
  85   scount = count = 0;
  86
  87   sei ();
  88 }
  89
  90 /*---------------------------------------------------------------------------*/
  91 clock_time_t
  92 clock_time(void)
  93 {
  94   clock_time_t tmp;
  95   do {
  96     tmp = count;
  97   } while(tmp != count);
  98   return tmp;
  99 }
 100 /*---------------------------------------------------------------------------*/
 101 /**
 102  * Delay the CPU for a multiple of TODO
 103  */
 104 void
 105 clock_delay(unsigned int i)
 106 {
 107   for (; i > 0; i--) {          /* Needs fixing XXX */
 108     unsigned j;
 109     for (j = 50; j > 0; j--)
 110       asm volatile("nop");
 111   }
 112 }
 113
 114 /*---------------------------------------------------------------------------*/
 115 /**
 116  * Wait for a multiple of 1 / 125 sec = 0.008 ms.
 117  *
 118  */
 119 void
 120 clock_wait(int i)
 121 {
 122   clock_time_t start;
 123
 124   start = clock_time();
 125   while(clock_time() - start < (clock_time_t)i);
 126 }
 127 /*---------------------------------------------------------------------------*/
 128 void
 129 clock_set_seconds(unsigned long sec)
 130 {
 131     // TODO
 132 }
 133
 134 unsigned long
 135 clock_seconds(void)
 136 {
 137   unsigned long tmp;
 138   do {
 139     tmp = seconds;
 140   } while(tmp != seconds);
 141   return tmp;
 142 }