ScStw/ESP32-HUB75-MatrixPanel-DMA
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mrfaptastic 2021-02-16 20:20:09 +00:00
parent 9dc00e35f1
commit cf8cb970e9
3 changed files with 34 additions and 29 deletions
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3
ESP32-HUB75-MatrixPanel-I2S-DMA.cpp
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@ -100,10 +100,11 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
Serial.println(F("DMA memory blocks available before any malloc's: "));
heap_caps_print_heap_info(MALLOC_CAP_DMA);
Serial.println(F("******************************************************************"));
Serial.printf_P(PSTR("We're going to need %d bytes of SRAM just for the frame buffer(s).\r\n"), _frame_buffer_memory_required);
Serial.printf_P(PSTR("The total amount of DMA capable SRAM memory is %d bytes.\r\n"), heap_caps_get_free_size(MALLOC_CAP_DMA));
Serial.printf_P(PSTR("Largest DMA capable SRAM memory block is %d bytes.\r\n"), heap_caps_get_largest_free_block(MALLOC_CAP_DMA));
Serial.println(F("******************************************************************"));
#endif

5
ESP32-HUB75-MatrixPanel-I2S-DMA.h
View file

@ -67,9 +67,6 @@
/***************************************************************************************/
/* Do not change definitions below unless you pretty sure you know what you are doing! */
#ifndef ESP32_I2S_CLOCK_SPEED
#define ESP32_I2S_CLOCK_SPEED (10000000UL) // @ 10Mhz
#endif
// RGB Panel Constants / Calculated Values
#ifndef MATRIX_ROWS_IN_PARALLEL
@ -233,7 +230,7 @@ struct HUB75_I2S_CFG {
/**
* I2S clock speed selector
*/
enum clk_speed {HZ_10M=10000000, HZ_13340K=13340000, HZ_16M=16000000, HZ_20M=20000000, HZ_26670K=26670000};
enum clk_speed {HZ_10M=10000000, HZ_20M=20000000};
// Structure Variables

55
examples/DoubleBufferSwap/DoubleBufferSwap.ino
View file

@ -10,8 +10,8 @@
* for different resolutions / panel chain lengths within the sketch 'setup()'.
*
*/
MatrixPanel_I2S_DMA display(true); // Note the TRUE -> Turns of secondary buffer - "double buffering"!
// Double buffering is not enabled by default with the library.
MatrixPanel_I2S_DMA *display = nullptr;
const byte row0 = 2+0*10;
const byte row1 = 2+1*10;
@ -26,30 +26,37 @@ void setup()
Serial.println("...Starting Display");
display.begin(); // setup display with pins as per defined in the library
display.setTextColor(display.color565(128, 128, 128));
HUB75_I2S_CFG mxconfig;
mxconfig.double_buff = true; // Turn of double buffer
// OK, now we can create our matrix object
display = new MatrixPanel_I2S_DMA(mxconfig);
display->begin(); // setup display with pins as per defined in the library
display->setTextColor(display->color565(255, 255, 255));
// Buffer 0 test
display.fillScreen(display.color565(128, 0, 0));
display.setCursor(3, row0);
display.print(F("Buffer 0"));
display.setCursor(3, row1);
display.print(F(" Buffer 0"));
display->fillScreen(display->color565(128, 0, 0));
display->setCursor(3, row0);
display->print(F("Buffer 0"));
display->setCursor(3, row1);
display->print(F(" Buffer 0"));
Serial.println("Wrote to to Buffer 0");
display.showDMABuffer();
display->showDMABuffer();
delay(1500);
// Buffer 1 test
display.flipDMABuffer();
display.fillScreen(display.color565(0, 128, 0)); // shouldn't see this
display.setCursor(3, row0);
display.print(F("Buffer 1"));
display.setCursor(3, row2);
display.print(F(" Buffer 1"));
display->flipDMABuffer();
display->fillScreen(display->color565(0, 128, 0)); // shouldn't see this
display->setCursor(3, row0);
display->print(F("Buffer 1"));
display->setCursor(3, row2);
display->print(F(" Buffer 1"));
Serial.println("Wrote to to Buffer 1");
display.showDMABuffer();
display->showDMABuffer();
delay(1500);
}
@ -57,31 +64,31 @@ void setup()
void loop() {
// Flip the back buffer
display.flipDMABuffer();
display->flipDMABuffer();
// Write: Set bottow row to black
for (int y=20;y<MATRIX_HEIGHT; y++)
for (int x=0;x<MATRIX_WIDTH; x++)
{
display.drawPixelRGB888( x, y, 0, 0, 0);
display->drawPixelRGB888( x, y, 0, 0, 0);
}
// Write: Set bottom row to blue (this is what should show)
for (int y=20;y<MATRIX_HEIGHT; y++)
for (int x=0;x<MATRIX_WIDTH; x++)
{
display.drawPixelRGB888( x, y, 0, 0, 64);
display->drawPixelRGB888( x, y, 0, 0, 64);
}
// Now show this back buffer
display.showDMABuffer();
display->showDMABuffer();
delay(1000);
// Flip back buffer
display.flipDMABuffer();
display->flipDMABuffer();
// Show this buffer
display.showDMABuffer();
display->showDMABuffer();
delay(1000);
}
}