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.

main.cpp@5:f2820d1efc08, 2017-04-10 (annotated)

Committer:
maclobdell
Date:
Mon Apr 10 14:43:42 2017 +0000
Revision:
5:f2820d1efc08
Parent:
4:8641e4da6744 
wait to display (send data) until frame buffer written.  speeds performance significantly.  Also added function to show text without scroll

Who changed what in which revision?

UserRevisionLine numberNew contents of line
maclobdell 0:2eec8a9428ea 1 #include "mbed.h"
maclobdell 0:2eec8a9428ea 2 #include "Adafruit_LEDBackpack.h"
maclobdell 0:2eec8a9428ea 3 #include "Adafruit_GFX.h"
maclobdell 0:2eec8a9428ea 4
maclobdell 0:2eec8a9428ea 5 I2C i2c(D14, D15);
maclobdell 1:dd1d1b64b9a5 6
maclobdell 4:8641e4da6744 7 //notes and todos-
maclobdell 4:8641e4da6744 8 //need to make the quad display with text scroll into its own class
maclobdell 4:8641e4da6744 9
maclobdell 4:8641e4da6744 10 //220uA no leds on
maclobdell 4:8641e4da6744 11 //default brightness - rises to 20mA at short peak then back down when scrolling hello
maclobdell 4:8641e4da6744 12 //brightness = 1, rises to ~4mA at short peak then back down when scrolling hello
maclobdell 4:8641e4da6744 13
maclobdell 1:dd1d1b64b9a5 14 //mpl - something with stdio screwing things up. need to define serial port to use for debug
maclobdell 1:dd1d1b64b9a5 15 Serial pc (USBTX,USBRX);
maclobdell 1:dd1d1b64b9a5 16
maclobdell 0:2eec8a9428ea 17 Adafruit_16x8matrix matrix = Adafruit_16x8matrix(&i2c);
maclobdell 1:dd1d1b64b9a5 18 Adafruit_16x8matrix matrix2 = Adafruit_16x8matrix(&i2c);
maclobdell 1:dd1d1b64b9a5 19
maclobdell 4:8641e4da6744 20 void scrollText(char * buffer, uint8_t buf_len, uint8_t speed);
maclobdell 5:f2820d1efc08 21 void showText(char * buffer, uint8_t buf_len, uint8_t duration);
maclobdell 5:f2820d1efc08 22
maclobdell 4:8641e4da6744 23 void myidlethread(void);
maclobdell 1:dd1d1b64b9a5 24
maclobdell 0:2eec8a9428ea 25 int main() {
maclobdell 1:dd1d1b64b9a5 26
maclobdell 1:dd1d1b64b9a5 27 matrix2.begin(0x71);
maclobdell 4:8641e4da6744 28 matrix2.setBrightness(1);
maclobdell 4:8641e4da6744 29 matrix2.setRotation(2);
maclobdell 4:8641e4da6744 30
maclobdell 1:dd1d1b64b9a5 31 matrix2.clear();
maclobdell 1:dd1d1b64b9a5 32 matrix2.writeDisplay();
maclobdell 2:ffe5cf2557e3 33
maclobdell 1:dd1d1b64b9a5 34 matrix.begin(0x70);
maclobdell 4:8641e4da6744 35 matrix.setBrightness(1);
maclobdell 4:8641e4da6744 36
maclobdell 1:dd1d1b64b9a5 37 matrix.clear();
maclobdell 1:dd1d1b64b9a5 38 matrix.writeDisplay();
maclobdell 1:dd1d1b64b9a5 39
maclobdell 2:ffe5cf2557e3 40 char buffer [50];
maclobdell 5:f2820d1efc08 41
maclobdell 5:f2820d1efc08 42 sprintf(buffer, "This\0");
maclobdell 5:f2820d1efc08 43 showText(buffer,strlen(buffer), 1);
maclobdell 5:f2820d1efc08 44 sprintf(buffer, "is\0");
maclobdell 5:f2820d1efc08 45 showText(buffer,strlen(buffer), 1);
maclobdell 5:f2820d1efc08 46 sprintf(buffer, "the\0");
maclobdell 5:f2820d1efc08 47 showText(buffer,strlen(buffer), 1);
maclobdell 4:8641e4da6744 48 sprintf (buffer, "IoT Lab\0");
maclobdell 5:f2820d1efc08 49
maclobdell 4:8641e4da6744 50 while(1)
maclobdell 4:8641e4da6744 51 {
maclobdell 5:f2820d1efc08 52 scrollText(buffer,strlen(buffer), 100);
maclobdell 4:8641e4da6744 53
maclobdell 4:8641e4da6744 54 Thread::attach_idle_hook (myidlethread);
maclobdell 4:8641e4da6744 55
maclobdell 4:8641e4da6744 56 Thread::wait(10000);
maclobdell 4:8641e4da6744 57 }
maclobdell 1:dd1d1b64b9a5 58
maclobdell 1:dd1d1b64b9a5 59 }
maclobdell 1:dd1d1b64b9a5 60
maclobdell 4:8641e4da6744 61 void myidlethread(void)
maclobdell 4:8641e4da6744 62 {
maclobdell 4:8641e4da6744 63 sleep(); //go to sleep, wait for an interrupt
maclobdell 4:8641e4da6744 64
maclobdell 4:8641e4da6744 65 }
maclobdell 4:8641e4da6744 66
maclobdell 4:8641e4da6744 67
maclobdell 4:8641e4da6744 68 void scrollText(char * buffer, uint8_t buf_len, uint8_t speed)
maclobdell 1:dd1d1b64b9a5 69 {
maclobdell 1:dd1d1b64b9a5 70
maclobdell 1:dd1d1b64b9a5 71 //pc.printf("buffer = %s, len = %d\r\n", buffer, buf_len);
maclobdell 1:dd1d1b64b9a5 72
maclobdell 1:dd1d1b64b9a5 73 /* code inspired by LOLShield library */
maclobdell 2:ffe5cf2557e3 74 int xoff=31;/* set offset to the right end of the screen - must be signed*/
maclobdell 2:ffe5cf2557e3 75 for(int i=0; i< (31 + buf_len*6 +10); i++){ /*scrolling loop*/
maclobdell 2:ffe5cf2557e3 76 for(int j=0; j<buf_len; j++){ /*loop over all of the chars in the text*/
maclobdell 2:ffe5cf2557e3 77 if(xoff > 15){
maclobdell 2:ffe5cf2557e3 78 matrix2.drawChar(xoff + j*6 - 16, 0, buffer[j], 1, 0, 1);
maclobdell 5:f2820d1efc08 79
maclobdell 2:ffe5cf2557e3 80 }else
maclobdell 1:dd1d1b64b9a5 81 {
maclobdell 1:dd1d1b64b9a5 82 matrix.drawChar(xoff + j*6, 0, buffer[j], 1, 0, 1);
maclobdell 2:ffe5cf2557e3 83 matrix2.drawChar(xoff + j*6 - 16, 0, buffer[j], 1, 0, 1);
maclobdell 1:dd1d1b64b9a5 84 }
maclobdell 1:dd1d1b64b9a5 85 }
maclobdell 1:dd1d1b64b9a5 86 xoff--; /* decrement x offset*/
maclobdell 5:f2820d1efc08 87 matrix.writeDisplay();
maclobdell 5:f2820d1efc08 88 matrix2.writeDisplay();
maclobdell 5:f2820d1efc08 89 Thread::wait(2000/speed);
maclobdell 1:dd1d1b64b9a5 90 matrix.clear();
maclobdell 1:dd1d1b64b9a5 91 matrix2.clear();
maclobdell 2:ffe5cf2557e3 92 }
maclobdell 1:dd1d1b64b9a5 93 }
maclobdell 5:f2820d1efc08 94
maclobdell 5:f2820d1efc08 95
maclobdell 5:f2820d1efc08 96 void showText(char * buffer, uint8_t buf_len, uint8_t duration)
maclobdell 5:f2820d1efc08 97 {
maclobdell 5:f2820d1efc08 98 for(int j=0; j<buf_len; j++){ /*loop over all of the chars in the text*/
maclobdell 5:f2820d1efc08 99 matrix.drawChar(j*6, 0, buffer[j], 1, 0, 1);
maclobdell 5:f2820d1efc08 100 matrix2.drawChar(j*6 - 16, 0, buffer[j], 1, 0, 1);
maclobdell 5:f2820d1efc08 101 }
maclobdell 5:f2820d1efc08 102 matrix.writeDisplay();
maclobdell 5:f2820d1efc08 103 matrix2.writeDisplay();
maclobdell 5:f2820d1efc08 104 Thread::wait(1000*duration);
maclobdell 5:f2820d1efc08 105 matrix.clear();
maclobdell 5:f2820d1efc08 106 matrix2.clear();
maclobdell 5:f2820d1efc08 107
maclobdell 5:f2820d1efc08 108 }