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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 "stm32f4xx.h"
#include "stm32f4xx_hal_ltdc.h"
#include <STM32F4HAL.hpp>
#include <STM32F4DMA.hpp>
extern LTDC_HandleTypeDef hltdc;
uint16_t* STM32F4HAL::getTFTFrameBuffer() const
{
return (uint16_t*)LTDC_Layer1->CFBAR;
}
void STM32F4HAL::setTFTFrameBuffer(uint16_t* adr)
{
LTDC_Layer1->CFBAR = (uint32_t)adr;
/* Reload immediate */
LTDC->SRCR = (uint32_t)LTDC_SRCR_IMR;
}
uint16_t STM32F4HAL::getTFTCurrentLine()
{
// This function only requires an implementation if single buffering
// on LTDC display is being used (REFRESH_STRATEGY_OPTIM_SINGLE_BUFFER_TFT_CTRL).
// The CPSR register (bits 15:0) specify current line of TFT controller.
uint16_t curr = (uint16_t)(LTDC->CPSR & 0xffff);
uint16_t backPorchY = (uint16_t)(LTDC->BPCR & 0x7FF) + 1;
// The semantics of the getTFTCurrentLine() function is to return a value
// in the range of 0-totalheight. If we are still in back porch area, return 0.
if (curr < backPorchY)
{
return 0;
}
else
{
return curr - backPorchY;
}
}
void STM32F4HAL::configureInterrupts()
{
// These two priorities MUST be EQUAL, and MUST be functionally lower than RTOS scheduler interrupts.
NVIC_SetPriority(DMA2D_IRQn, 9);
NVIC_SetPriority(LTDC_IRQn, 9);
}
static uint16_t lcd_int_active_line;
static uint16_t lcd_int_porch_line;
/* Enable LCD line interrupt, when entering video (active) area */
void STM32F4HAL::enableLCDControllerInterrupt()
{
lcd_int_active_line = (LTDC->BPCR & 0x7FF) - 1;
lcd_int_porch_line = (LTDC->AWCR & 0x7FF) - 1;
HAL_LTDC_ProgramLineEvent(&hltdc, lcd_int_active_line);
__HAL_LTDC_ENABLE_IT(&hltdc, LTDC_IT_LI|LTDC_IT_FU); /* Enable line and FIFO underrun interrupts */
}
void STM32F4HAL::disableInterrupts()
{
NVIC_DisableIRQ(LTDC_IRQn);
NVIC_DisableIRQ(DMA2D_IRQn);
NVIC_DisableIRQ(LTDC_ER_IRQn);
}
void STM32F4HAL::enableInterrupts()
{
NVIC_EnableIRQ(LTDC_IRQn);
NVIC_EnableIRQ(DMA2D_IRQn);
NVIC_EnableIRQ(LTDC_ER_IRQn);
}
extern "C"
void HAL_LTDC_LineEvenCallback(LTDC_HandleTypeDef *hltdc)
{
if (LTDC->LIPCR == lcd_int_active_line)
{
//entering active area
HAL_LTDC_ProgramLineEvent(hltdc, lcd_int_porch_line);
HAL::getInstance()->vSync();
OSWrappers::signalVSync();
// 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();
GPIO::set(GPIO::VSYNC_FREQ);
}
else
{
//exiting active area
HAL_LTDC_ProgramLineEvent(hltdc, lcd_int_active_line);
GPIO::clear(GPIO::VSYNC_FREQ);
HAL::getInstance()->frontPorchEntered();
}
}