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30 results

support.c

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  • Forked from card10 / firmware
    Source project has a limited visibility.
    support.c 3.07 KiB
    /*
     * FreeRTOS support functions
     */
    
    #include "FreeRTOS.h"
    #include "task.h"
    
    #include "api/dispatcher.h"
    
    #include "card10.h"
    
    extern TaskHandle_t dispatcher_task_id;
    
    /*
     * This hook is called before FreeRTOS enters tickless idle.
     */
    void pre_idle_sleep(TickType_t xExpectedIdleTime)
    {
    	if (xExpectedIdleTime > 0) {
    		/*
    		 * WFE because the other core should be able to notify
    		 * epicardium if it wants to issue an API call.
    		 */
    
    		/*
    		 * TODO: Ensure this is actually correct and does not have any
    		 * race conditions.
    		 */
    		__asm volatile("dsb" ::: "memory");
    		__asm volatile("wfe");
    		__asm volatile("isb");
    		GPIO_OutClr(&debug_pin_0);
    	}
    }
    
    /*
     * This hook is called after FreeRTOS exits tickless idle.
     */
    void post_idle_sleep(TickType_t xExpectedIdleTime)
    {
    	/* Check whether a new API call was issued. */
    	if (api_dispatcher_poll_once()) {
    		xTaskNotifyGive(dispatcher_task_id);
    	}
    
    	/*
    	 * Do card10 house keeping. e.g. polling the i2c devices if they
    	 * triggered an interrupt.
    	 *
    	 * TODO: Do this in a more task focused way (high/low ISR)
    	 */
    	card10_poll();
    }
    
    void vApplicationGetIdleTaskMemory(
    	StaticTask_t **ppxIdleTaskTCBBuffer,
    	StackType_t **ppxIdleTaskStackBuffer,
    	uint32_t *pulIdleTaskStackSize
    ) {
    	/*
    	 * If the buffers to be provided to the Idle 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 xIdleTaskTCB;
    	static StackType_t uxIdleTaskStack[configMINIMAL_STACK_SIZE];
    
    	/*
    	 * Pass out a pointer to the StaticTask_t structure in which the Idle task's
    	 * ktate will be stored.