feat(epicardium): Enable FreeRTOS timers

Signed-off-by: Rahix <rahix@rahix.de>

epicardium/FreeRTOSConfig.h

@@ -43,6 +43,11 @@
 #define configUSE_CO_ROUTINES       0
 #define configUSE_16_BIT_TICKS      0
 #define configUSE_MUTEXES           1
+#define configUSE_TIMERS            1
+
+#define configTIMER_TASK_PRIORITY   (configMAX_PRIORITIES - 1)
+#define configTIMER_QUEUE_LENGTH    10
+#define configTIMER_TASK_STACK_DEPTH (configMINIMAL_STACK_SIZE * 2)
 
 #define INCLUDE_vTaskSuspend        1
 #define INCLUDE_vTaskDelay          1

epicardium/support.c

@@ -80,3 +80,35 @@ void vApplicationGetIdleTaskMemory(
 	 */
 	*pulIdleTaskStackSize = configMINIMAL_STACK_SIZE;
 }
+
+void vApplicationGetTimerTaskMemory(
+	StaticTask_t **ppxTimerTaskTCBBuffer,
+	StackType_t **ppxTimerTaskStackBuffer,
+	uint32_t *pulTimerTaskStackSize
+) {
+	/*
+	 * If the buffers to be provided to the Timer task are declared inside
+	 * this function then they must be declared static - otherwise they will
+	 * be allocated on the stack and so not exists after this function
+	 * exits.
+	 */
+	static StaticTask_t xTimerTaskTCB;
+	static StackType_t uxTimerTaskStack[configTIMER_TASK_STACK_DEPTH];
+
+	/*
+	 * Pass out a pointer to the StaticTask_t structure in which the Timer
+	 * task's state will be stored.
+	 */
+	*ppxTimerTaskTCBBuffer = &xTimerTaskTCB;
+
+	/* Pass out the array that will be used as the Timer task's stack. */
+	*ppxTimerTaskStackBuffer = uxTimerTaskStack;
+
+	/*
+	 * Pass out the size of the array pointed to by
+	 * *ppxTimerTaskStackBuffer.  Note that, as the array is necessarily of
+	 * type StackType_t, configMINIMAL_STACK_SIZE is specified in words, not
+	 * bytes.
+	 */
+	*pulTimerTaskStackSize = configTIMER_TASK_STACK_DEPTH;
+}