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 static volatile clock_time_t count;
  10 static volatile uint8_t scount;
  11 volatile unsigned long seconds;
  12
  13 /* Set RADIOSTATS to monitor radio on time (must also be set in the radio driver) */
  14 #if RF230BB && WEBSERVER
  15 #define RADIOSTATS 1
  16 #endif
  17 #if RADIOSTATS
  18 static volatile uint8_t rcount;
  19 volatile unsigned long radioontime;
  20 extern uint8_t RF230_receive_on;
  21 #endif
  22
  23 /*
  24   CLOCK_SECOND is the number of ticks per second.
  25   It is defined through CONF_CLOCK_SECOND in the contiki-conf.h for each platform.
  26   The usual AVR default is ~125 ticks per second, counting a prescaler the CPU clock
  27   using the 8 bit timer0.
  28
  29   As clock_time_t is an unsigned 16 bit data type, intervals up to 524 seconds
  30   can be measured with 8 millisecond precision.
  31   For longer intervals a 32 bit global is incremented every second.
  32
  33   clock-avr.h contains the specific setup code for each mcu.
  34 */
  35 /*---------------------------------------------------------------------------*/
  36 //SIGNAL(SIG_OUTPUT_COMPARE0)
  37 ISR(AVR_OUTPUT_COMPARE_INT)
  38 {
  39   count++;
  40   if(++scount == CLOCK_SECOND) {
  41     scount = 0;
  42     seconds++;
  43   }
  44 #if RADIOSTATS
  45   if (RF230_receive_on) {
  46     if (++rcount == CLOCK_SECOND) {
  47       rcount=0;
  48       radioontime++;
  49     }
  50   }
  51 #endif
  52   if(etimer_pending()) {
  53     etimer_request_poll();
  54   }
  55 }
  56
  57 /*---------------------------------------------------------------------------*/
  58 void
  59 clock_init(void)
  60 {
  61   cli ();
  62   OCRSetup();
  63 //scount = count = 0;
  64   sei ();
  65 }
  66
  67 /*---------------------------------------------------------------------------*/
  68 clock_time_t
  69 clock_time(void)
  70 {
  71   clock_time_t tmp;
  72   do {
  73     tmp = count;
  74   } while(tmp != count);
  75   return tmp;
  76 }
  77 /*---------------------------------------------------------------------------*/
  78 /**
  79  * Delay the CPU for a multiple of TODO
  80  */
  81 void
  82 clock_delay(unsigned int i)
  83 {
  84   for (; i > 0; i--) {          /* Needs fixing XXX */
  85     unsigned j;
  86     for (j = 50; j > 0; j--)
  87       asm volatile("nop");
  88   }
  89 }
  90
  91 /*---------------------------------------------------------------------------*/
  92 /**
  93  * Wait for a multiple of 1 / 125 sec = 0.008 ms.
  94  *
  95  */
  96 void
  97 clock_wait(int i)
  98 {
  99   clock_time_t start;
 100
 101   start = clock_time();
 102   while(clock_time() - start < (clock_time_t)i);
 103 }
 104 /*---------------------------------------------------------------------------*/
 105 void
 106 clock_set_seconds(unsigned long sec)
 107 {
 108     // TODO
 109 }
 110
 111 unsigned long
 112 clock_seconds(void)
 113 {
 114   unsigned long tmp;
 115   do {
 116     tmp = seconds;
 117   } while(tmp != seconds);
 118   return tmp;
 119 }