Added working display driver

firmware/display_frame_renderer/display_frame_renderer.ino

@@ -0,0 +1,90 @@
+// Use the MD_MAX72XX library to Print some text on the display
+//
+// Demonstrates the use of the library to print text.
+//
+// User can enter text on the serial monitor and this will display as a
+// message on the display.
+// Library doc https://majicdesigns.github.io/MD_MAX72XX/class_m_d___m_a_x72_x_x.html
+
+#include <MD_MAX72xx.h>
+#include <SPI.h>
+
+#define PRINT(s, v) { Serial.print(F(s)); Serial.print(v); }
+
+// Define the number of devices we have in the chain and the hardware interface
+// NOTE: These pin numbers will probably not work with your hardware and may
+// need to be adapted
+#define HARDWARE_TYPE MD_MAX72XX::DR1CR0RR0_HW    
+#define MAX_DEVICES 8
+
+#define CLK_PIN   D5  // or SCK
+#define DATA_PIN  D7  // or MOSI
+#define CS_PIN    D4 // or SS
+
+// 'test-frame', 32x16px
+const unsigned char epd_bitmap_test_frame [] PROGMEM = {
+  0x00, 0x00, 0x00, 0x00, 
+  0x00, 0x00, 0x00, 0x00, 
+  0x00, 0x00, 0x00, 0x00, 
+  0x22, 0x00, 0x00, 0x44, 
+  0x44, 0x00, 0x00, 0x22, 
+  0x89, 0x80, 0x01, 0x91, 
+  0x92, 0x40, 0x02, 0x49, 
+  0x82, 0x40, 0x02, 0x41, 
+  0x81, 0x80, 0x01, 0x81, 
+  0x80, 0x04, 0x40, 0x01, 
+  0x80, 0x09, 0x20, 0x01, 
+  0x87, 0x89, 0x21, 0xe1, 
+  0x40, 0x06, 0xc0, 0x02, 
+  0x27, 0x80, 0x01, 0xe4, 
+  0x00, 0x00, 0x00, 0x00, 
+  0x00, 0x00, 0x00, 0x00
+};
+
+// Array of all bitmaps for convenience. (Total bytes used to store images in PROGMEM = 80)
+const int epd_bitmap_allArray_LEN = 1;
+const unsigned char* epd_bitmap_allArray[1] = {
+  epd_bitmap_test_frame
+};
+
+
+// SPI hardware interface
+MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
+// Arbitrary pins
+//MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);
+
+byte fByte(byte c){ char r=0; for(byte i = 0; i < 8; i++){ r <<= 1; r |= c & 1; c >>= 1; } return r;}
+void renderFrame(){
+
+  //Top half of the display
+  int fsize = sizeof(epd_bitmap_test_frame);
+  for (int i = 0; i < fsize/2; i+=4) {
+    for (int d=0; d<=3; d++){
+      //For each of the driver, from 0 to 3
+      byte rowData = pgm_read_byte(&epd_bitmap_test_frame[i + d]);
+      mx.setRow(d,d,7 - int(i/4),fByte(rowData));
+    }
+  }
+  //Bottom half of the display
+  for (int i = fsize/2; i < fsize; i+=4) {
+    for (int d=4; d<=7; d++){
+      //For each of the driver, from 4 to 7
+      byte rowData = pgm_read_byte(&epd_bitmap_test_frame[i + (d - 4)]);
+      mx.setRow(d,d,7 - (int(i/4) - 8),fByte(rowData));
+    }
+  }
+  
+}
+
+void setup(){
+  mx.begin();
+
+  Serial.begin(57600);
+  Serial.print("\nFrame Rendering");
+  renderFrame();
+  Serial.print("\nDone");
+}
+
+void loop(){
+
+}

firmware/display_test/display_test.ino

@@ -4,6 +4,7 @@
 //
 // User can enter text on the serial monitor and this will display as a
 // message on the display.
+// Library doc https://majicdesigns.github.io/MD_MAX72XX/class_m_d___m_a_x72_x_x.html
 
 #include <MD_MAX72xx.h>
 #include <SPI.h>