main.cpp

00001 /* Copyright (c) 2012 Andrew Lindsa, MIT License
00002  *
00003  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
00004  * and associated documentation files (the "Software"), to deal in the Software without restriction, 
00005  * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
00006  * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
00007  * furnished to do so, subject to the following conditions:
00008  *
00009  * The above copyright notice and this permission notice shall be included in all copies or 
00010  * substantial portions of the Software.
00011  *
00012  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
00013  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
00014  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
00015  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
00016  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017  * 
00018  * Simple scrolling message display for mbed and HT1632C based LED matrix displays
00019  */
00020 #include "mbed.h"
00021 #include "rtos.h"
00022 #include "HT1632_LedMatrix.h"
00023 
00024 Serial pc(USBTX, USBRX); // tx, rx
00025 
00026 // Define the onboard LEDs to use as status indicators
00027 DigitalOut led1(LED1);      // Activity
00028 DigitalOut led2(LED2);      // Activity, alternates with led2
00029 
00030 // create object to control the LED Matrix
00031 HT1632_LedMatrix led = HT1632_LedMatrix();
00032 
00033 #define DISPDELAY 90
00034 
00035 // Define the message, add blanks to front so it doesnt lose first part immediately
00036 char* msg = "    The quick brown fox jumped over the lazy dog!!!";
00037 int crtPos = 0;
00038 int msgx = 1;    // position on message screen of current character, set to 1 to allow for first scroll
00039 
00040 /*
00041 * This works for multiple 8x32 matrix.
00042 */
00043 void displayScrollingLine( void const* )
00044 {
00045     int y,xmax,ymax;
00046     led.getXYMax(&xmax,&ymax);
00047     while(true) {
00048         // shift the whole screen 6 times, one column at a time;
00049         for (int x=0; x < 6; x++) {
00050             led.scrollLeft(1,0);
00051             msgx--;
00052             // fit as much as we can on display
00053             while (!led.putChar(msgx,0,msg[crtPos])) { // zero return if it all fitted on display
00054                 led.getXY(&msgx,&y);
00055                 crtPos++; // we got all of the character on!!
00056                 if (crtPos >= strlen(msg)) {
00057                     crtPos = 0;
00058                 }
00059             }
00060             led.putShadowRam();
00061             Thread::wait(DISPDELAY);
00062         }
00063     }
00064 }
00065 
00066 
00067 int main()
00068 {
00069     // Define how many displays we have, older 0832 allowed vertical stacking
00070     // newer ones dont unless you want a gap between the displays.
00071     // Num horizontal displays 1 to 4, num vertical displays 1 to 4. Max 4 displays can be used.
00072     // Usable combinations are 1,1; 2,1; 3,1; 4,1; and 2,2; 1,2; 1,3; 1,4; with gaps!!
00073     led.init(2,1);
00074     pc.baud(9600);
00075     printf("LED Matrix dislay test");
00076     led.clear();
00077     led.setBrightness(8);
00078 
00079     Thread displayTask(displayScrollingLine, NULL, osPriorityNormal, 1024 * 4);
00080 
00081     // Show we are still working by alternatively flashing LED1 and LED2, once a second
00082     led1 = 0;       // Working
00083     led2 = 1;       // Alternate with led1
00084     while(1) {
00085         led1=!led1;
00086         led2=!led2;
00087         Thread::wait(1000);
00088     }
00089 }