Thursday, March 28, 2019

Teensy 3.1 and SmartMatrix SD running 32x32 and 32x64 LED Matrix panels.

I purchased a Teensy 3.1 and Smart Matrix SD with 32x32 LED panel kit.  It is called "Pixelmatix SmartMatrix SD Shield KIT, Teensy 3.1, 32x32 RGB LED matrix 4mm pitch".  It had some bugs like the connector that goes to the LED panel, if installed on the Smart Matrix shield, would not fit the panel that came with the kit.  The power connector was in the way.  So as a solution I used a ribbon cable from the smart matrix to the LED panel.  I also added female headers so that the Teensy processor can be removed and used elsewhere.


Here is a video of it working.


This is a close up of the Teensy and SmartMatrix shield. Note that everything is on the top side of the board.
Now to fix the Teensy code to support the newer 64x32 LED panels.

Here is a video of the Teensy working with two 64x32 LED panels after being "Reset" with the code below.



This is the reset code.
// SMart Matrix Panel Reset Program
// For use with newer LED Panels
// Written 3/28/2019 by Bob Davis
int MaxLed = 256;

#define GPIO_PIN_CLK_TEENSY_PIN    14
#define GPIO_PIN_LATCH_TEENSY_PIN   3
#define GPIO_PIN_OE_TEENSY_PIN      4
#define GPIO_PIN_B0_TEENSY_PIN      6
#define GPIO_PIN_R0_TEENSY_PIN      2
#define GPIO_PIN_R1_TEENSY_PIN      21
#define GPIO_PIN_G0_TEENSY_PIN      5
#define GPIO_PIN_G1_TEENSY_PIN      7
#define GPIO_PIN_B1_TEENSY_PIN      20
#define ADDX_TEENSY_PIN_0   9
#define ADDX_TEENSY_PIN_1   10
#define ADDX_TEENSY_PIN_2   22
#define ADDX_TEENSY_PIN_3   23

int C12[16] = {0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
int C13[16] = {0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0};

void setup() {
  // put your setup code here, to run once:
    pinMode(GPIO_PIN_CLK_TEENSY_PIN, OUTPUT);
    pinMode(GPIO_PIN_LATCH_TEENSY_PIN, OUTPUT);
    pinMode(GPIO_PIN_OE_TEENSY_PIN, OUTPUT);
    pinMode(GPIO_PIN_B0_TEENSY_PIN, OUTPUT);
    pinMode(GPIO_PIN_R0_TEENSY_PIN, OUTPUT);
    pinMode(GPIO_PIN_R1_TEENSY_PIN, OUTPUT);
    pinMode(GPIO_PIN_G0_TEENSY_PIN, OUTPUT);
    pinMode(GPIO_PIN_G1_TEENSY_PIN, OUTPUT);
    pinMode(GPIO_PIN_B1_TEENSY_PIN, OUTPUT);
    pinMode(ADDX_TEENSY_PIN_0, OUTPUT);
    pinMode(ADDX_TEENSY_PIN_1, OUTPUT);
    pinMode(ADDX_TEENSY_PIN_2, OUTPUT);
    pinMode(ADDX_TEENSY_PIN_3, OUTPUT);
}

void loop() {
    // put your main code here, to run repeatedly:
    // Send Data to control register 11
    digitalWrite (GPIO_PIN_OE_TEENSY_PIN, HIGH); // Display reset
    digitalWrite (GPIO_PIN_LATCH_TEENSY_PIN, LOW);
    digitalWrite (GPIO_PIN_CLK_TEENSY_PIN, LOW);
    for (int l=0; l<MaxLed; l++){
      int y=l%16;
      digitalWrite (GPIO_PIN_R0_TEENSY_PIN,LOW);
      digitalWrite (GPIO_PIN_G0_TEENSY_PIN,LOW);
      digitalWrite (GPIO_PIN_B0_TEENSY_PIN,LOW);
      digitalWrite (GPIO_PIN_R1_TEENSY_PIN,LOW);
      digitalWrite (GPIO_PIN_G1_TEENSY_PIN,LOW);
      digitalWrite (GPIO_PIN_B1_TEENSY_PIN,LOW);
      if (C12[y]==1){
          digitalWrite (GPIO_PIN_R0_TEENSY_PIN,HIGH);
          digitalWrite (GPIO_PIN_G0_TEENSY_PIN,HIGH);
          digitalWrite (GPIO_PIN_B0_TEENSY_PIN,HIGH);
          digitalWrite (GPIO_PIN_R1_TEENSY_PIN,HIGH);
          digitalWrite (GPIO_PIN_G1_TEENSY_PIN,HIGH);
          digitalWrite (GPIO_PIN_B1_TEENSY_PIN,HIGH);
      }
      if (l>MaxLed-12){digitalWrite(GPIO_PIN_LATCH_TEENSY_PIN, HIGH);}
          else{digitalWrite(GPIO_PIN_LATCH_TEENSY_PIN, LOW);}
      digitalWrite(GPIO_PIN_CLK_TEENSY_PIN, HIGH); 
      digitalWrite(GPIO_PIN_CLK_TEENSY_PIN, LOW); 
    }
  digitalWrite (GPIO_PIN_LATCH_TEENSY_PIN, LOW);
  digitalWrite (GPIO_PIN_CLK_TEENSY_PIN, LOW);
  // Send Data to control register 12
    for (int l=0; l<MaxLed; l++){
      int y=l%16;
      digitalWrite (GPIO_PIN_R0_TEENSY_PIN,LOW);
      digitalWrite (GPIO_PIN_G0_TEENSY_PIN,LOW);
      digitalWrite (GPIO_PIN_B0_TEENSY_PIN,LOW);
      digitalWrite (GPIO_PIN_R1_TEENSY_PIN,LOW);
      digitalWrite (GPIO_PIN_G1_TEENSY_PIN,LOW);
      digitalWrite (GPIO_PIN_B1_TEENSY_PIN,LOW);
      if (C13[y]==1){
          digitalWrite (GPIO_PIN_R0_TEENSY_PIN,HIGH);
          digitalWrite (GPIO_PIN_G0_TEENSY_PIN,HIGH);
          digitalWrite (GPIO_PIN_B0_TEENSY_PIN,HIGH);
          digitalWrite (GPIO_PIN_R1_TEENSY_PIN,HIGH);
          digitalWrite (GPIO_PIN_G1_TEENSY_PIN,HIGH);
          digitalWrite (GPIO_PIN_B1_TEENSY_PIN,HIGH);
      }   
      if (l>MaxLed-13){digitalWrite(GPIO_PIN_LATCH_TEENSY_PIN, HIGH);}
          else{digitalWrite(GPIO_PIN_LATCH_TEENSY_PIN, LOW);}
      digitalWrite(GPIO_PIN_CLK_TEENSY_PIN, HIGH); 
      digitalWrite(GPIO_PIN_CLK_TEENSY_PIN, LOW); 
    }
  digitalWrite (GPIO_PIN_LATCH_TEENSY_PIN, LOW);
  digitalWrite (GPIO_PIN_CLK_TEENSY_PIN, LOW);
}

Here is a video of the Teensy displaying text on two 64x32 LED arrays.

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