giomba/nes-proj
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Stack-friendly cc243x clock ISR enabled by default

Browse Source 
This new approach (CLOCK_CONF_ACCURATE=0) was not as inaccurate
as originally thought. In fact, it has pretty much the same
accuracy as the old, stack-hungry version.

* Renamed the define from CLOCK_CONF_ACCURATE (1: old) to
  CLOCK_CONF_STACK_FRIENDLY (1: new) to stop implying
  that one is more accurate than the other.
* Using CLOCK_CONF_STACK_FRIENDLY by default.
This commit is contained in:
George Oikonomou 2012-04-02 16:49:07 +01:00
parent 924fe934c1
commit ce17fa131c
3 changed files with 16 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
cpu/cc2430/dev/clock.c
View File

@ -47,15 +47,12 @@
/* Used in sleep timer interrupt for calculating the next interrupt time */
static unsigned long timer_value;
/*starts calculating the ticks right after reset*/
#if CLOCK_CONF_ACCURATE
static volatile __data clock_time_t count = 0;
#else
volatile __data clock_time_t count = 0;
/* accurate clock is stack hungry */
#if CLOCK_CONF_STACK_FRIENDLY
volatile __bit sleep_flag;
#else
#endif
/*calculates seconds*/
static volatile __data clock_time_t count = 0; /* Uptime in ticks */
static volatile __data clock_time_t seconds = 0; /* Uptime in secs */
/*---------------------------------------------------------------------------*/
/**
@ -152,13 +149,13 @@ clock_ISR(void) __interrupt(ST_VECTOR)
++seconds;
}
#if CLOCK_CONF_ACCURATE
#if CLOCK_CONF_STACK_FRIENDLY
sleep_flag = 1;
#else
if(etimer_pending()
&& (etimer_next_expiration_time() - count - 1) > MAX_TICKS) {
etimer_request_poll();
}
#else
sleep_flag = 1;
#endif
IRCON_STIF = 0;

10
platform/sensinode/contiki-conf.h
View File

@ -10,10 +10,12 @@
#include "project-conf.h"
#endif /* PROJECT_CONF_H */
/* The clock ISR is stack-hungry and may cause crashes.
* Define this as 0 if you are suffering from frequent stack overflows */
#ifndef CLOCK_CONF_ACCURATE
#define CLOCK_CONF_ACCURATE 1
/*
* Define this as 1 to poll the etimer process from within main instead of from
* the clock ISR. This reduces the ISR's stack usage and may prevent crashes.
*/
#ifndef CLOCK_CONF_STACK_FRIENDLY
#define CLOCK_CONF_STACK_FRIENDLY 1
#endif
/* Memory filesystem RAM size. */

10
platform/sensinode/contiki-sensinode-main.c
View File

@ -54,10 +54,7 @@ static __data int len;
#define PUTCHAR(...) do {} while(0)
#endif
#if !CLOCK_CONF_ACCURATE
extern volatile __data clock_time_t count;
/* accurate clock is stack hungry */
#if CLOCK_CONF_STACK_FRIENDLY
extern volatile __bit sleep_flag;
#endif
@ -294,11 +291,10 @@ main(void)
/* Reset watchdog and handle polls and events */
watchdog_periodic();
/**/
#if !CLOCK_CONF_ACCURATE
#if CLOCK_CONF_STACK_FRIENDLY
if(sleep_flag) {
if(etimer_pending() &&
(etimer_next_expiration_time() - count - 1) > MAX_TICKS) { /*core/sys/etimer.c*/
(etimer_next_expiration_time() - clock_time() - 1) > MAX_TICKS) {
etimer_request_poll();
}
sleep_flag = 0;