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/**
******************************************************************************
* This file is part of the TouchGFX 4.10.0 distribution.
*
* @attention
*
* Copyright (c) 2018 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
#include <touchgfx/hal/OSWrappers.hpp>
#include <touchgfx/lcd/LCD.hpp>
#include <touchgfx/hal/GPIO.hpp>
#include <STM32F4HAL_DSI.hpp>
#include <STM32F4DMA.hpp>
#include <FreeRTOS.h>
#include <task.h>
/**
* About this implementation:
* This class is for use ONLY with the DSI peripheral. If you have a regular RGB interface display, use the STM32F4HAL.cpp class instead.
*
* This implementation assumes that the DSI is configured to be in adapted command mode, with tearing effect set to external pin.
* Display will only be updated when there has actually been changes to the frame buffer.
*/
extern "C"
{
#include "stm32f4xx.h"
#include "stm32f4xx_hal_dsi.h"
#include "stm32f4xx_hal_ltdc.h"
#include "stm32f4xx_hal_gpio.h"
extern LTDC_HandleTypeDef hltdc;
extern DSI_HandleTypeDef hdsi;
/* Request tear interrupt at specific scanline. Implemented in BoardConfiguration.cpp */
void LCD_ReqTear();
/* Configures display to update indicated region of the screen (200pixel wide chunks) - 16bpp mode */
void LCD_SetUpdateRegion(int idx);
/* Configures display to update left half of the screen. Implemented in BoardConfiguration.cpp - 24bpp mode*/
void LCD_SetUpdateRegionLeft();
/* Configures display to update right half of the screen. Implemented in BoardConfiguration.cpp - 24bpp mode*/
void LCD_SetUpdateRegionRight();
}
static volatile bool displayRefreshing = false;
static volatile bool refreshRequested = false;
static volatile int updateRegion = 0;
static bool doubleBufferingEnabled = false;
static uint16_t* currFbBase = 0;
static uint16_t bitDepth = 0;
uint16_t* STM32F4HAL_DSI::getTFTFrameBuffer() const
{
return currFbBase;
}
void STM32F4HAL_DSI::setFrameBufferStartAddress(void* adr, uint16_t depth, bool useDoubleBuffering, bool useAnimationStorage)
{
// Make note of whether we are using double buffering.
doubleBufferingEnabled = useDoubleBuffering;
currFbBase = (uint16_t*)adr;
bitDepth = depth;
HAL::setFrameBufferStartAddress(adr, depth, useDoubleBuffering, useAnimationStorage);
}
void STM32F4HAL_DSI::setTFTFrameBuffer(uint16_t* adr)
{
if (doubleBufferingEnabled)
{
__HAL_DSI_WRAPPER_DISABLE(&hdsi);
LTDC_LAYER(&hltdc, 0)->CFBAR = (uint32_t)adr;
__HAL_LTDC_RELOAD_IMMEDIATE_CONFIG(&hltdc);
currFbBase = adr;
__HAL_DSI_WRAPPER_ENABLE(&hdsi);
}
}
void STM32F4HAL_DSI::configureInterrupts()
{
// These two priorities MUST be EQUAL, and MUST be functionally lower than RTOS scheduler interrupts.
NVIC_SetPriority(DMA2D_IRQn, 7);
NVIC_SetPriority(DSI_IRQn, 7);
}
/* Enable LCD line interrupt, when entering video (active) area */
void STM32F4HAL_DSI::enableLCDControllerInterrupt()
{
LCD_ReqTear();
__HAL_DSI_CLEAR_FLAG(&hdsi, DSI_IT_ER);
__HAL_DSI_CLEAR_FLAG(&hdsi, DSI_IT_TE);
__HAL_DSI_ENABLE_IT(&hdsi, DSI_IT_TE);
__HAL_DSI_ENABLE_IT(&hdsi, DSI_IT_ER);
LTDC->IER = 3; /* Enable line and FIFO underrun interrupts */
}
void STM32F4HAL_DSI::disableInterrupts()
{
NVIC_DisableIRQ(DMA2D_IRQn);
NVIC_DisableIRQ(DSI_IRQn);
NVIC_DisableIRQ(LTDC_ER_IRQn);
}
void STM32F4HAL_DSI::enableInterrupts()
{
NVIC_EnableIRQ(DMA2D_IRQn);
NVIC_EnableIRQ(DSI_IRQn);
NVIC_EnableIRQ(LTDC_ER_IRQn);
}
bool STM32F4HAL_DSI::beginFrame()
{
refreshRequested = false;
return HAL::beginFrame();
}
void STM32F4HAL_DSI::endFrame()
{
HAL::endFrame();
if (frameBufferUpdatedThisFrame)
{
refreshRequested = true;
}
}
extern "C"
void HAL_DSI_TearingEffectCallback(DSI_HandleTypeDef *hdsi)
{
GPIO::set(GPIO::VSYNC_FREQ);
if (HAL::getInstance())
{
HAL::getInstance()->vSync();
if (xTaskGetSchedulerState() != taskSCHEDULER_NOT_STARTED)
{
OSWrappers::signalVSync();
}
}
if (!doubleBufferingEnabled && HAL::getInstance())
{
// In single buffering, only require that the system waits for display update to be finished if we
// actually intend to update the display in this frame.
HAL::getInstance()->lockDMAToFrontPorch(refreshRequested);
}
if (refreshRequested && !displayRefreshing)
{
// We have an update pending.
if (doubleBufferingEnabled && HAL::getInstance())
{
// Swap frame buffers immediately instead of waiting for the task to be scheduled in.
// Note: task will also swap when it wakes up, but that operation is guarded and will not have
// any effect if already swapped.
HAL::getInstance()->swapFrameBuffers();
}
// Update region 0 = first area of display (First quarter for 16bpp, first half for 24bpp)
updateRegion = 0;
//Set update region based on bit depth of framebuffer. 16pp or 24bpp.
if (bitDepth == 24)
{
LCD_SetUpdateRegionLeft();
}
//Default to 16 bpp
else
{
LCD_SetUpdateRegion(updateRegion);
}
// Transfer a quarter screen of pixel data.
HAL_DSI_Refresh(hdsi);
displayRefreshing = true;
} else
{
GPIO::clear(GPIO::VSYNC_FREQ);
}
}
extern "C"
void HAL_DSI_EndOfRefreshCallback(DSI_HandleTypeDef *hdsi)
{
if (displayRefreshing)
{
if (bitDepth == 24)
{
if (updateRegion == 0)
{
// If we transferred the left half, also transfer right half.
__HAL_DSI_WRAPPER_DISABLE(hdsi);
LTDC_LAYER(&hltdc, 0)->CFBAR = ((uint32_t)currFbBase) + (HAL::FRAME_BUFFER_WIDTH / 2) * 3;
__HAL_LTDC_RELOAD_IMMEDIATE_CONFIG(&hltdc);
LCD_SetUpdateRegionRight(); //Set display column to 400-799
__HAL_DSI_WRAPPER_ENABLE(hdsi);
updateRegion = 1;
HAL_DSI_Refresh(hdsi);
}
else
{
// Otherwise we are done refreshing.
__HAL_DSI_WRAPPER_DISABLE(hdsi);
LTDC_LAYER(&hltdc, 0)->CFBAR = (uint32_t)currFbBase;
__HAL_LTDC_RELOAD_IMMEDIATE_CONFIG(&hltdc);
LCD_SetUpdateRegionLeft(); //Set display column to 0-399
__HAL_DSI_WRAPPER_ENABLE(hdsi);
GPIO::clear(GPIO::VSYNC_FREQ);
displayRefreshing = false;
if (HAL::getInstance())
{
// Signal to the framework that display update has finished.
HAL::getInstance()->frontPorchEntered();
}
}
} else //Default to 16bpp
{
updateRegion++;
if (updateRegion < 4)
{
__HAL_DSI_WRAPPER_DISABLE(hdsi);
LTDC_LAYER(&hltdc, 0)->CFBAR = (uint32_t)currFbBase + (updateRegion * HAL::FRAME_BUFFER_WIDTH) / 2;
__HAL_LTDC_RELOAD_IMMEDIATE_CONFIG(&hltdc);
LCD_SetUpdateRegion(updateRegion);
__HAL_DSI_WRAPPER_ENABLE(hdsi);
HAL_DSI_Refresh(hdsi);
}
else
{
__HAL_DSI_WRAPPER_DISABLE(hdsi);
LTDC_LAYER(&hltdc, 0)->CFBAR = (uint32_t)currFbBase;
__HAL_LTDC_RELOAD_IMMEDIATE_CONFIG(&hltdc);
LCD_SetUpdateRegion(0);
__HAL_DSI_WRAPPER_ENABLE(hdsi);
GPIO::clear(GPIO::VSYNC_FREQ);
displayRefreshing = false;
if (HAL::getInstance())
{
// Signal to the framework that display update has finished.
HAL::getInstance()->frontPorchEntered();
}
}
}
}
}