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Honour values of configCPU_CLOCK_HZ & configTICK_RATE_HZ for tick rate

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Fixes #147

* Can vary tick rate from 100Hz via configTICK_RATE_HZ. Note that the
  SDK binary libraries are hard-coded to assume the tick rate is 100Hz,
  so changing the tick rate may have unexpected consequences for lower
  layer WiFi behaviour (such as certain kinds of timeouts happening
  faster/slower.)

* Setting configCPU_CLOCK_HZ to 160MHz means ESP will set 160MHz during
  initialisation. Only 80MHz and 160MHz are supported.

* Timing of tasks is no longer affected by current CPU freq (whether set
  via configCPU_CLOCK_HZ or via sdk_system_update_cpu_freq().)
  Previously doubling the CPU frequency would double the tick rate.
This commit is contained in:
Angus Gratton 2016-06-30 09:22:17 +10:00
parent 701a4c4284
commit 678b59babf
5 changed files with 19 additions and 2 deletions
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7
FreeRTOS/Source/include/FreeRTOSConfig.h
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@ -34,6 +34,13 @@
#define configUSE_TICK_HOOK 0
#endif
#ifndef configCPU_CLOCK_HZ
/* This is the _default_ clock speed for the CPU. Can be either 80MHz
* or 160MHz, and the system will set the clock speed to match at startup.
Note that it's possible to change the clock speed at runtime, so you
can/should use sdk_system_get_cpu_frequency() in order to determine the
current CPU frequency, in preference to this macro.
*/
#define configCPU_CLOCK_HZ ( ( unsigned long ) 80000000 )
#endif
#ifndef configTICK_RATE_HZ