drjones/sunflower-picture-app
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Optimize performance: 4-bit SD_MMC, write-only SPI, and hardware byte swapping

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drjones
2026-06-30 01:18:01 -07:00
parent e04ee7cfe4
commit 4fa200d649
4 changed files with 29 additions and 32 deletions
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2
sound_picture_app/Display_PNG.cpp
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@@ -35,7 +35,7 @@ void pngDraw(PNGDRAW *pDraw) {
png.getLineAsRGB565(pDraw, lineBuffer, PNG_RGB565_BIG_ENDIAN, 0xffffffff);
uint32_t size = pDraw->iWidth;
for (size_t i = 0; i < size; i++) {
lineBuffer[i] = (((lineBuffer[i] >> 8) & 0xFF) | ((lineBuffer[i] << 8) & 0xFF00));
lineBuffer[i] = __builtin_bswap16(lineBuffer[i]);
}
LCD_addWindow(xpos, pDraw->y, xpos + pDraw->iWidth - 1, ypos + pDraw->y, lineBuffer);
}

11
sound_picture_app/Display_ST7789.cpp
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@@ -202,14 +202,19 @@ parameter :
Yend : End uint16_t coordinates
color : Set the color
******************************************************************************/
void LCD_addWindow(uint16_t Xstart, uint16_t Ystart, uint16_t Xend, uint16_t Yend,uint16_t* color)
void LCD_addWindow(uint16_t Xstart, uint16_t Ystart, uint16_t Xend, uint16_t Yend, uint16_t* color)
{
uint16_t Show_Width = Xend - Xstart + 1;
uint16_t Show_Height = Yend - Ystart + 1;
uint32_t numBytes = Show_Width * Show_Height * sizeof(uint16_t);
uint8_t Read_D[numBytes];
LCD_SetCursor(Xstart, Ystart, Xend, Yend);
LCD_WriteData_nbyte((uint8_t*)color, Read_D, numBytes);
LCDspi.beginTransaction(SPISettings(SPIFreq, MSBFIRST, SPI_MODE0));
digitalWrite(EXAMPLE_PIN_NUM_LCD_CS, LOW);
digitalWrite(EXAMPLE_PIN_NUM_LCD_DC, HIGH);
LCDspi.writeBytes((uint8_t*)color, numBytes);
digitalWrite(EXAMPLE_PIN_NUM_LCD_CS, HIGH);
LCDspi.endTransaction();
}
// backlight
void Backlight_Init(void)

4
sound_picture_app/SD_Card.cpp
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@@ -11,8 +11,8 @@ void SD_Init() {
printf("SD MMC: Pin change failed!\r\n");
return;
}
if (SD_MMC.begin("/sdcard", true, true)) {
printf("SD card initialization successful!\r\n");
if (SD_MMC.begin("/sdcard", false, true)) {
printf("SD card initialization successful (4-bit mode)!\r\n");
} else {
printf("SD card initialization failed!\r\n");
}