Mac Lobdell / Mbed OS Adafruit_LEDBackpack_32x8_App

Example application for two 16x8 Adafruit LED Backpacks to make a 32 x 8 matrix.

Dependencies:   Adafruit_32x8matrix

Fork of Adafruit_LEDBackpack_16x8_App by Mac Lobdell

/media/uploads/maclobdell/austin_iot_lab.jpg

This project uses two 16x8 1.2" LED Matrix + Backpacks stuck together to make a 32x8 double-length matrix.

Files at this revision

API Documentation at this revision

Revision 5:f2820d1efc08, committed 2017-04-10

Comitter:
maclobdell
Date:
Mon Apr 10 14:43:42 2017 +0000
Parent:
4:8641e4da6744
Commit message:
wait to display (send data) until frame buffer written. speeds performance significantly. Also added function to show text without scroll

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Sat Apr 08 02:57:54 2017 +0000
+++ b/main.cpp	Mon Apr 10 14:43:42 2017 +0000
@@ -18,6 +18,8 @@
 Adafruit_16x8matrix matrix2 = Adafruit_16x8matrix(&i2c); 
 
 void scrollText(char * buffer, uint8_t buf_len, uint8_t speed);
+void showText(char * buffer, uint8_t buf_len, uint8_t duration);
+
 void myidlethread(void);
 
 int main() {
@@ -36,11 +38,18 @@
         matrix.writeDisplay();
         
         char buffer [50];
+
+        sprintf(buffer, "This\0");
+        showText(buffer,strlen(buffer), 1);
+        sprintf(buffer, "is\0");
+        showText(buffer,strlen(buffer), 1);
+        sprintf(buffer, "the\0");
+        showText(buffer,strlen(buffer), 1);        
         sprintf (buffer, "IoT Lab\0");
-
+        
     while(1)
     {
-        scrollText(buffer,strlen(buffer), 1000);
+        scrollText(buffer,strlen(buffer), 100);
         
         Thread::attach_idle_hook (myidlethread);
           
@@ -67,18 +76,33 @@
          for(int j=0; j<buf_len; j++){ /*loop over all of the chars in the text*/
             if(xoff > 15){
                 matrix2.drawChar(xoff + j*6 - 16, 0, buffer[j], 1, 0, 1);
-                matrix2.writeDisplay();
+
             }else
             {
                 matrix.drawChar(xoff + j*6, 0, buffer[j], 1, 0, 1);
-                matrix.writeDisplay();
                 matrix2.drawChar(xoff + j*6 - 16, 0, buffer[j], 1, 0, 1);
-                matrix2.writeDisplay();
             }    
         }
         xoff--; /* decrement x offset*/
-        Thread::wait(1000/speed);
+        matrix.writeDisplay();
+        matrix2.writeDisplay();
+        Thread::wait(2000/speed);
         matrix.clear();
         matrix2.clear();
     }    
 }    
+
+
+void showText(char * buffer, uint8_t buf_len, uint8_t duration)
+{
+     for(int j=0; j<buf_len; j++){ /*loop over all of the chars in the text*/
+        matrix.drawChar(j*6, 0, buffer[j], 1, 0, 1);
+        matrix2.drawChar(j*6 - 16, 0, buffer[j], 1, 0, 1);
+    }
+    matrix.writeDisplay();
+    matrix2.writeDisplay();
+    Thread::wait(1000*duration);
+    matrix.clear();
+    matrix2.clear();
+ 
+}   
\ No newline at end of file