ESP32-HUB75-MatrixPanel-DMA/examples/Four_Scan_Panel/Four_Scan_Panel.ino

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/*************************************************************************
* Description:
*
* The underlying implementation of the ESP32-HUB75-MatrixPanel-I2S-DMA only
* supports output to HALF scan panels - which means outputting
* two lines at the same time, 16 or 32 rows apart if a 32px or 64px high panel
* respectively.
* This cannot be changed at the DMA layer as it would require a messy and complex
* rebuild of the library's internals.
*
* However, it is possible to connect QUARTER (i.e. FOUR lines updated in parallel)
* scan panels to this same library and
* 'trick' the output to work correctly on these panels by way of adjusting the
* pixel co-ordinates that are 'sent' to the ESP32-HUB75-MatrixPanel-I2S-DMA
* library.
*
**************************************************************************/
#include "ESP32-HUB75-MatrixPanel-I2S-DMA.h"
/* Use the Virtual Display class to re-map co-ordinates such that they draw
* correctly on a 32x16 1/8 Scan panel (or chain of such panels).
*/
#include "ESP32-VirtualMatrixPanel-I2S-DMA.h"
// Panel configuration
#define PANEL_RES_X 64 // Number of pixels wide of each INDIVIDUAL panel module.
#define PANEL_RES_Y 32 // Number of pixels tall of each INDIVIDUAL panel module.
#define NUM_ROWS 1 // Number of rows of chained INDIVIDUAL PANELS
#define NUM_COLS 2 // Number of INDIVIDUAL PANELS per ROW
// ^^^ NOTE: DEFAULT EXAMPLE SETUP IS FOR A CHAIN OF TWO x 1/8 SCAN PANELS
// Change this to your needs, for details on VirtualPanel pls read the PDF!
#define SERPENT true
#define TOPDOWN false
// placeholder for the matrix object
MatrixPanel_I2S_DMA *dma_display = nullptr;
// placeholder for the virtual display object
VirtualMatrixPanel *FourScanPanel = nullptr;
/******************************************************************************
* Setup!
******************************************************************************/
void setup()
{
delay(250);
Serial.begin(115200);
Serial.println(""); Serial.println(""); Serial.println("");
Serial.println("*****************************************************");
Serial.println("* 1/8 Scan Panel Demonstration *");
Serial.println("*****************************************************");
/*
// 62x32 1/8 Scan Panels don't have a D and E pin!
HUB75_I2S_CFG::i2s_pins _pins = {
R1_PIN, G1_PIN, B1_PIN, R2_PIN, G2_PIN, B2_PIN,
A_PIN, B_PIN, C_PIN, D_PIN, E_PIN,
LAT_PIN, OE_PIN, CLK_PIN
};
*/
HUB75_I2S_CFG mxconfig(
PANEL_RES_X*2, // DO NOT CHANGE THIS
PANEL_RES_Y/2, // DO NOT CHANGE THIS
NUM_ROWS*NUM_COLS // DO NOT CHANGE THIS
//,_pins // Uncomment to enable custom pins
);
mxconfig.clkphase = false; // Change this if you see pixels showing up shifted wrongly by one column the left or right.
//mxconfig.driver = HUB75_I2S_CFG::FM6126A; // in case that we use panels based on FM6126A chip, we can set it here before creating MatrixPanel_I2S_DMA object
// OK, now we can create our matrix object
dma_display = new MatrixPanel_I2S_DMA(mxconfig);
// let's adjust default brightness to about 75%
dma_display->setBrightness8(96); // range is 0-255, 0 - 0%, 255 - 100%
// Allocate memory and start DMA display
if( not dma_display->begin() )
Serial.println("****** !KABOOM! I2S memory allocation failed ***********");
dma_display->clearScreen();
delay(500);
// create FourScanPanellay object based on our newly created dma_display object
FourScanPanel = new VirtualMatrixPanel((*dma_display), NUM_ROWS, NUM_COLS, PANEL_RES_X, PANEL_RES_Y, SERPENT, TOPDOWN);
// THE IMPORTANT BIT BELOW!
FourScanPanel->setPhysicalPanelScanRate(FOUR_SCAN_32PX_HIGH);
}
void loop() {
// What the panel sees from the DMA engine!
for (int i=PANEL_RES_X*2+10; i< PANEL_RES_X*(NUM_ROWS*NUM_COLS)*2; i++)
{
dma_display->drawLine(i, 0, i, 7, dma_display->color565(255, 0, 0)); // red
delay(10);
}
dma_display->clearScreen();
delay(1000);
/*
// Try again using the pixel / dma memory remapper
for (int i=PANEL_RES_X+5; i< (PANEL_RES_X*2)-1; i++)
{
FourScanPanel->drawLine(i, 0, i, 7, dma_display->color565(0, 0, 255)); // blue
delay(10);
}
*/
// Try again using the pixel / dma memory remapper
int offset = PANEL_RES_X*((NUM_ROWS*NUM_COLS)-1);
for (int i=0; i< PANEL_RES_X; i++)
{
FourScanPanel->drawLine(i+offset, 0, i+offset, 7, dma_display->color565(0, 0, 255)); // blue
FourScanPanel->drawLine(i+offset, 8, i+offset, 15, dma_display->color565(0, 128,0)); // g
FourScanPanel->drawLine(i+offset, 16, i+offset, 23, dma_display->color565(128, 0,0)); // red
FourScanPanel->drawLine(i+offset, 24, i+offset, 31, dma_display->color565(0, 128, 128)); // blue
delay(10);
}
delay(1000);
// Print on each chained panel 1/8 module!
// This only really works for a single horizontal chain
for (int i = 0; i < NUM_ROWS*NUM_COLS; i++)
{
FourScanPanel->setTextColor(FourScanPanel->color565(255, 255, 255));
FourScanPanel->setCursor(i*PANEL_RES_X+7, FourScanPanel->height()/3);
// Red text inside red rect (2 pix in from edge)
FourScanPanel->print("Panel " + String(i+1));
FourScanPanel->drawRect(1,1, FourScanPanel->width()-2, FourScanPanel->height()-2, FourScanPanel->color565(255,0,0));
// White line from top left to bottom right
FourScanPanel->drawLine(0,0, FourScanPanel->width()-1, FourScanPanel->height()-1, FourScanPanel->color565(255,255,255));
}
delay(2000);
dma_display->clearScreen();
} // end loop