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Copy draw buffer into frame buffer after last vertical line

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TODO: get rid of the blocking DMA copy
This commit is contained in:
Raphael Coeffic
2022-06-11 15:38:08 +02:00
committed by Raphael Coeffic
parent b827376acb
commit 59c5e22620
3 changed files with 47 additions and 79 deletions
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radio/src/targets/nv14/lcd_driver.cpp
+24 -44
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@@ -1179,13 +1179,15 @@ void LCD_Init_LTDC() {
// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// NVIC_Init(&NVIC_InitStructure);
LTDC_ITConfig(LTDC_IER_LIE, ENABLE);
// Configure IRQ (line)
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = LTDC_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = LTDC_IRQ_PRIO;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; /* Not used as 4 bits are used for the pre-emption priority. */;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// Trigger on last line
LTDC_LIPConfig(LCD_PHYS_H);
#if 0
@@ -1557,52 +1559,30 @@ void lcdCopy(void * dest, void * src)
while (DMA2D_GetFlagStatus(DMA2D_FLAG_TC) == RESET);
}
//static volatile uint8_t refreshRequested = 0;
static volatile uint8_t _frameBufferAddressReloaded = 0;
static uint16_t* next_frame_buffer;
static rect_t next_frame_area;
extern "C" void LTDC_IRQHandler(void)
{
LTDC_ClearFlag(LTDC_ICR_CLIF);
_frameBufferAddressReloaded = 1;
// clear interrupt flag
LTDC->ICR = LTDC_ICR_CRRIF;
LTDC_ITConfig(LTDC_IER_LIE, DISABLE);
// TODO: use modified version with "Transfer Complete" IRQ
DMACopyBitmap((uint16_t *)LCD_FRAME_BUFFER, LCD_PHYS_W, LCD_PHYS_H,
next_frame_area.x, next_frame_area.y, next_frame_buffer,
next_frame_area.w, next_frame_area.h, 0, 0,
next_frame_area.w, next_frame_area.h);
// TODO: call on "Transfer Complete" IRQ
lcdFlushed();
}
static void lcdSwitchLayers()
void newLcdRefresh(uint16_t * buffer, const rect_t& copy_area)
{
if (currentLayer == LCD_FIRST_LAYER) {
LTDC_Layer1->CFBAR = (uint32_t)LCD_SECOND_FRAME_BUFFER;
LCD_SetLayer(LCD_SECOND_LAYER);
}
else {
LTDC_Layer1->CFBAR = (uint32_t)LCD_FIRST_FRAME_BUFFER;
LCD_SetLayer(LCD_FIRST_LAYER);
}
// reload shadow registers on vertical blank
_frameBufferAddressReloaded = 0;
LTDC->SRCR = LTDC_SRCR_VBR;
// wait for reload
// TODO: replace through some smarter mechanism without busy wait
while(_frameBufferAddressReloaded == 0);
}
static bool once = false;
void newLcdRefresh(uint16_t *buffer, const rect_t& copy_area)
{
DMACopyBitmap((uint16_t*)LCD_BACKUP_FRAME_BUFFER, LCD_PHYS_W, LCD_PHYS_H, copy_area.x, copy_area.y, buffer, copy_area.w, copy_area.h, 0, 0, copy_area.w, copy_area.h);
if(!once)
{
LTDC_Layer1->CFBAR = (intptr_t)LCD_BACKUP_FRAME_BUFFER;
_frameBufferAddressReloaded = 0;
LTDC->SRCR = LTDC_SRCR_VBR;
while(_frameBufferAddressReloaded == 0);
once=true;
}
}
void lcdRefresh()
{
// lcdSwitchLayers();
next_frame_buffer = buffer;
next_frame_area = copy_area;
// Enable line IRQ
LTDC_ITConfig(LTDC_IER_LIE, ENABLE);
}