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TSCH: comment on how the TSCH base drift is computed

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This commit is contained in:
Simon Duquennoy 2017-07-15 12:08:10 +02:00 committed by Yasuyuki Tanaka
parent a11c2f4a1f
commit 688c6ee114
5 changed files with 41 additions and 7 deletions
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9
arch/platform/cc2538dk/contiki-conf.h
View File

@ -47,7 +47,14 @@ typedef uint32_t rtimer_clock_t;
#define RADIO_DELAY_BEFORE_DETECT 0
#ifndef TSCH_CONF_BASE_DRIFT_PPM
/* The drift compared to "true" 10ms slots.
* Enable adaptive sync to enable compensation for this. */
* Enable adaptive sync to enable compensation for this.
* Slot length 10000 usec
* 328 ticks
* Tick duration 30.517578125 usec
* Real slot duration 10009.765625 usec
* Target - real duration = -9.765625 usec
* TSCH_CONF_BASE_DRIFT_PPM -977
*/
#define TSCH_CONF_BASE_DRIFT_PPM -977
#endif
/*---------------------------------------------------------------------------*/

12
arch/platform/jn516x/platform-conf.h
View File

@ -110,9 +110,15 @@ typedef uint32_t rtimer_clock_t;
/* If the timer base a binary 32kHz clock, compensate for this base drift */
#if RTIMER_USE_32KHZ && JN516X_EXTERNAL_CRYSTAL_OSCILLATOR
/* Drift calculated using this formula:
* ((US_TO_TICKS(10000) * 100) - RTIMER_SECOND) * 1e6 = 976.5625 ppm
*/
/* The drift compared to "true" 10ms slots.
* Enable adaptive sync to enable compensation for this.
* Slot length 10000 usec
* 328 ticks
* Tick duration 30.517578125 usec
* Real slot duration 10009.765625 usec
* Target - real duration = -9.765625 usec
* TSCH_CONF_BASE_DRIFT_PPM -977
*/
#define TSCH_CONF_BASE_DRIFT_PPM -977
#endif

9
arch/platform/openmote-cc2538/contiki-conf.h
View File

@ -86,7 +86,14 @@ typedef uint32_t rtimer_clock_t;
#define RADIO_DELAY_BEFORE_DETECT 0
#ifndef TSCH_CONF_BASE_DRIFT_PPM
/* The drift compared to "true" 10ms slots.
* Enable adaptive sync to enable compensation for this. */
* Enable adaptive sync to enable compensation for this.
* Slot length 10000 usec
* 328 ticks
* Tick duration 30.517578125 usec
* Real slot duration 10009.765625 usec
* Target - real duration = -9.765625 usec
* TSCH_CONF_BASE_DRIFT_PPM -977
*/
#define TSCH_CONF_BASE_DRIFT_PPM -977
#endif
/*---------------------------------------------------------------------------*/

9
arch/platform/srf06-cc26xx/contiki-conf.h
View File

@ -280,7 +280,14 @@ typedef uint32_t rtimer_clock_t;
#ifndef TSCH_CONF_BASE_DRIFT_PPM
/* The drift compared to "true" 10ms slots.
* Enable adaptive sync to enable compensation for this. */
* Enable adaptive sync to enable compensation for this.
* Slot length 10000 usec
* 328 ticks
* Tick duration 30.517578125 usec
* Real slot duration 10009.765625 usec
* Target - real duration = -9.765625 usec
* TSCH_CONF_BASE_DRIFT_PPM -977
*/
#define TSCH_CONF_BASE_DRIFT_PPM -977
#endif

9
arch/platform/zoul/contiki-conf.h
View File

@ -84,7 +84,14 @@ typedef uint32_t rtimer_clock_t;
#define RADIO_DELAY_BEFORE_DETECT 0
#ifndef TSCH_CONF_BASE_DRIFT_PPM
/* The drift compared to "true" 10ms slots.
* Enable adaptive sync to enable compensation for this. */
* Enable adaptive sync to enable compensation for this.
* Slot length 10000 usec
* 328 ticks
* Tick duration 30.517578125 usec
* Real slot duration 10009.765625 usec
* Target - real duration = -9.765625 usec
* TSCH_CONF_BASE_DRIFT_PPM -977
*/
#define TSCH_CONF_BASE_DRIFT_PPM -977
#endif
/*---------------------------------------------------------------------------*/