main.cpp

00001 #include "mbed.h"
00002 #include "Adafruit_LEDBackpack.h"
00003 #include "Adafruit_GFX.h"
00004  
00005 I2C i2c(D14, D15);
00006 
00007 //mpl - something with stdio screwing things up.  need to define serial port to use for debug
00008 Serial pc (USBTX,USBRX);
00009 
00010 Adafruit_16x8matrix matrix = Adafruit_16x8matrix(&i2c);
00011 Adafruit_16x8matrix matrix2 = Adafruit_16x8matrix(&i2c); 
00012 
00013 void scrollText(char * buffer, uint8_t buf_len);
00014 
00015 int main() {
00016 
00017         matrix2.begin(0x71);
00018         matrix2.clear();
00019         matrix2.writeDisplay();
00020         
00021         matrix.begin(0x70);
00022         matrix.clear();
00023         matrix.writeDisplay();
00024         
00025         char buffer [50];
00026         sprintf (buffer, "Hello\0");
00027         scrollText(buffer,strlen(buffer));
00028 
00029 }
00030 
00031 void scrollText(char * buffer, uint8_t buf_len)
00032 {
00033     
00034     //pc.printf("buffer = %s, len = %d\r\n", buffer, buf_len);
00035     
00036     /* code inspired by LOLShield library */
00037     int xoff=31;/* set offset to the right end of the screen - must be signed*/
00038     for(int i=0; i< (31 + buf_len*6 +10); i++){ /*scrolling loop*/
00039          for(int j=0; j<buf_len; j++){ /*loop over all of the chars in the text*/
00040             if(xoff > 15){
00041                 matrix2.drawChar(xoff + j*6 - 16, 0, buffer[j], 1, 0, 1);
00042                 matrix2.writeDisplay();
00043             }else
00044             {
00045                 matrix.drawChar(xoff + j*6, 0, buffer[j], 1, 0, 1);
00046                 matrix.writeDisplay();
00047                 matrix2.drawChar(xoff + j*6 - 16, 0, buffer[j], 1, 0, 1);
00048                 matrix2.writeDisplay();
00049             }    
00050         }
00051         xoff--; /* decrement x offset*/
00052         Thread::wait(70);
00053         matrix.clear();
00054         matrix2.clear();
00055     }    
00056 }