142 lines
3.7 KiB
C++
142 lines
3.7 KiB
C++
/**
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******************************************************************************
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* File Name : OSWrappers.cpp
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2021 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under Ultimate Liberty license
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* SLA0044, the "License"; You may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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* www.st.com/SLA0044
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*
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******************************************************************************
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*/
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#include <stm32f7xx_hal.h>
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#include <TouchGFXHAL.hpp>
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#include <touchgfx/hal/OSWrappers.hpp>
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static volatile uint32_t fb_sem;
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static volatile uint32_t vsync_sem;
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using namespace touchgfx;
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/*
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* Initialize frame buffer semaphore and queue/mutex for VSYNC signal.
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*/
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void OSWrappers::initialize()
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{
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fb_sem = 0;
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vsync_sem = 0;
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}
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/*
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* Take the frame buffer semaphore. Blocks until semaphore is available.
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*/
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void OSWrappers::takeFrameBufferSemaphore()
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{
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while(fb_sem);
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fb_sem = 1;
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}
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/*
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* Release the frame buffer semaphore.
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*/
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void OSWrappers::giveFrameBufferSemaphore()
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{
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fb_sem = 0;
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}
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/*
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* Attempt to obtain the frame buffer semaphore. If semaphore is not available, do
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* nothing.
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*
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* Note must return immediately! This function does not care who has the taken the semaphore,
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* it only serves to make sure that the semaphore is taken by someone.
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*/
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void OSWrappers::tryTakeFrameBufferSemaphore()
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{
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fb_sem = 1;
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}
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/*
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* Release the frame buffer semaphore in a way that is safe in interrupt context. Called
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* from ISR.
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*
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* Release the frame buffer semaphore in a way that is safe in interrupt context.
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* Called from ISR.
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*/
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void OSWrappers::giveFrameBufferSemaphoreFromISR()
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{
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fb_sem = 0;
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}
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/*
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* Signal that a VSYNC has occurred. Should make the vsync queue/mutex available.
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*
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* Note This function is called from an ISR, and should (depending on OS) trigger a
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* scheduling.
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*/
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void OSWrappers::signalVSync()
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{
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vsync_sem = 1;
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}
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/*
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* Signal that the rendering of the frame has completed. Used by
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* some systems to avoid using any previous vsync.
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*/
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void OSWrappers::signalRenderingDone()
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{
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vsync_sem = 0;
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}
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/*
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* This function checks if a VSync occurred after last rendering.
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* The function is used in systems that cannot wait in waitForVSync
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* (because they are also checking other event sources.
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*
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* @note signalRenderingDone is typically used together with this function.
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*
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* @return True if VSync occurred.
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*/
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bool OSWrappers::isVSyncAvailable()
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{
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return vsync_sem;
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}
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/*
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* This function check if a VSYNC has occured.
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* If VSYNC has occured, signal TouchGFX to start a rendering
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*/
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void OSWrappers::waitForVSync()
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{
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if(vsync_sem)
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{
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vsync_sem = 0;
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HAL::getInstance()->backPorchExited();
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}
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}
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/*
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* A function that causes executing task to sleep for a number of milliseconds.
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*
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* A function that causes executing task to sleep for a number of milliseconds.
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* This function is OPTIONAL. It is only used by the TouchGFX in the case of
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* a specific frame refresh strategy (REFRESH_STRATEGY_OPTIM_SINGLE_BUFFER_TFT_CTRL).
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* Due to backwards compatibility, in order for this function to be useable by the HAL
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* the function must be explicitly registered:
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* hal.registerTaskDelayFunction(&OSWrappers::taskDelay)
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*
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* see HAL::setFrameRefreshStrategy(FrameRefreshStrategy s)
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* see HAL::registerTaskDelayFunction(void (*delayF)(uint16_t))
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*/
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void OSWrappers::taskDelay(uint16_t ms)
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{
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HAL_Delay(ms);
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}
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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