FreeRTOS 配置TICK_RATE_HZ
我使用的是带有 5.4 版 FreeRTOS 的 MSP430f5438。
我有一个有趣的问题，我无法弄清楚。
基本上，当我将 configTICK_RATE_HZ 设置为不同的值时，LED 闪烁得更快或更慢；它应该保持相同的速率。我将 configTICK_RATE_HZ 设置得越高，它闪烁得越慢，而当我将 TICK_RATE 设置得较低时，它闪烁得越快。
vTaskDelayUntil( &xLastFlashTime, xFlashRate );无论 configTICK_RATE_HZ 是多少，LED 应该每秒只闪烁一次。我逐步检查了 xFlashRate 以进行确定。它总是 = configTICK_RATE_HZ。 代码：
xFlashRate = ledFLASH_RATE_BASE;//my flash base rate is 1000ms
xFlashRate /= portTICK_RATE_MS; //so xFlashrate = whatever configTICK_RATE_HZ equals
/* We need to initialise xLastFlashTime prior to the first call to vTaskDelayUntil().*/
xLastFlashTime = xTaskGetTickCount();
for(;;) {
vTaskDelayUntil( &xLastFlashTime, xFlashRate ); vParTestToggleLED( uxLED );
flashled();//this should happen every 1 second.
}
当我将 configtick_rate_hz 设置为 1000 时，LED 闪烁的周期大于 1 秒，而当我将节拍率设置为小于 ~200
configTICK_RATE_HZ 时，LED 闪烁的周期远小于 1 秒，不应影响 LED 闪烁时间。
我意识到需要更多信息，并将随时提供所需的任何代码片段来提供帮助。
I am using an MSP430f5438 with version 5.4 of FreeRTOS.
I am having a funny problem that I can't figure out.
Basically, when I set configTICK_RATE_HZ to different values, the LED blinks faster or slower; it should stay the same rate. It blinks slower the higher i set configTICK_RATE_HZ, and faster when I set TICK_RATE lower.
vTaskDelayUntil( &xLastFlashTime, xFlashRate ); is such that the LED should only blink once a second no matter what the configTICK_RATE_HZ is. I stepped through and checked the xFlashRate to make sure. Its always = to the configTICK_RATE_HZ.
Code:
xFlashRate = ledFLASH_RATE_BASE;//my flash base rate is 1000ms
xFlashRate /= portTICK_RATE_MS; //so xFlashrate = whatever configTICK_RATE_HZ equals
/* We need to initialise xLastFlashTime prior to the first call to vTaskDelayUntil().*/
xLastFlashTime = xTaskGetTickCount();
for(;;) {
vTaskDelayUntil( &xLastFlashTime, xFlashRate ); vParTestToggleLED( uxLED );
flashled();//this should happen every 1 second.
}
The led blink with a period greater than 1 second when i set the configtick_rate_hz to 1000 and the led blinks with a period far less than 1s when i set the tick rate to anything less than ~200
configTICK_RATE_HZ should not affect the LED blinktime.
I realize more info is needed and will readily supply whatever code snippets are needed to help.
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RTOS 节拍由定时器中断生成。计时器设置（不正确），因此无论您设置 configTICK_RATE_HZ 是什么，它总是会在 400kHz 处产生固定滴答声。由于闪烁率是在 RTOS 滴答率由 configTICK_RATE_HZ (portTICK_RATE_MS = 1000/configTICK_RATE_HZ) 正确表示的假设下设置的，因此问题随之而来。
The RTOS tick is generated by a Timer interrupt. The timer was set (improperly) such that it always caused a fixed tick at 400kHz no matter what you set configTICK_RATE_HZ too. Since the blink rate is set under the assumption that the RTOS tick rate is properly represented by the configTICK_RATE_HZ (portTICK_RATE_MS = 1000/configTICK_RATE_HZ), problems ensued.