main.cpp

00001 /* An mbed tutorial example using the
00002 4.3' PCT 4d systems touch screen display.
00003 
00004 uses the mbed_genie library ported from the arduino
00005 visie-genie library by Christian B
00006 
00007 The display serial TX and RX pins are connected to pin 9
00008 and pin 10 of the mbed, the reset pin is connected to pin 11
00009 
00010 For setting up the display in Visie-Genie
00011 
00012 The display has a rocker switch object, an LED object,
00013 and a slider object.
00014 
00015 The program reads the status of the rocker switch
00016 and was supposed to turn on the LED.
00017 
00018 The slider adjusts the flash rate of the LED
00019 
00020 The baud rate of the display is set to 115200 baud
00021 
00022 The Mbed4dGenie class requires 3 parameters
00023     1 - Tx pin
00024     2 - Rx pin
00025     3 - Reset pin
00026 */
00027 
00028 #include "mbed.h"
00029 #include "mbed_genie.h"
00030 
00031 Mbed4dGenie lcd4d(p9,p10,p11);
00032 
00033 DigitalOut whiteLED(p26);     //LED 1 for indication
00034 int rockersw_val = 0;         //holds the status of the 4Dbutton0 Object
00035 
00036 int sliderRead = 0;
00037 float flashRate = 1;        //variable to store LED flash rate
00038 int flag = 0;               //flag variable to store rockerswitch state
00039 
00040 //Event handler for the 4d Systems display
00041 void myGenieEventHandler(void)
00042 {
00043     genieFrame Event;
00044     lcd4d.genieDequeueEvent(&Event);
00045 
00046     //event report from an object
00047     if(Event.reportObject.cmd == GENIE_REPORT_EVENT) {
00048         if (Event.reportObject.object == GENIE_OBJ_ROCKERSW) { // If the Reported Message was from a rocker switch
00049             if (Event.reportObject.index == 0) {
00050                 printf("Rocker switch 0 pressed!\n\r");
00051                 rockersw_val = lcd4d.genieGetEventData(&Event);  //extract the MSB and LSB values and pass them to rockersw_val
00052 
00053                 if (rockersw_val == 0) {                   //if Rockerswitch0 is off
00054                     flag = 0;                              //"turn off" the LED
00055                     printf("Rocker switch switch in off state\n\r"); //print a serial message for debugging
00056                 }
00057 
00058                 else if (rockersw_val == 1) {              //if Rockerswitch0 is on
00059                     flag = 1;                              //"turn on" the LED
00060                     printf("Rocker switch switch in ON state\n\r"); //print a serial message for debugging
00061                 }
00062             }
00063         }
00064 
00065         if (Event.reportObject.object == GENIE_OBJ_SLIDER) {    // If the Reported Message was from a slider object
00066             if (Event.reportObject.index == 0) {                // If the slider object was slider0
00067                 printf("Slider object changed!\n\r");           // Display a serial message for debugging
00068                 sliderRead = lcd4d.genieGetEventData(&Event);   // Read the current silder0 value
00069                 printf("SliderRead = %d \n\r", sliderRead);     // Display the Slider0 value
00070                 flashRate = 0.01;                               // Set flash rate initially to 10 ms On / Off
00071                 flashRate = 1 - (flashRate * sliderRead);       // Apply the value of slider0 object to flashRate
00072 
00073 
00074             }
00075 
00076             //Cmd from a reported object (happens when an object read is requested)
00077             if(Event.reportObject.cmd == GENIE_REPORT_OBJ) {
00078 
00079             }
00080         }
00081     }
00082 }
00083 
00084 int main()
00085 
00086 {
00087     lcd4d.genieAttachEventHandler(&myGenieEventHandler);    // Call the event handler for the 4D display
00088 
00089     lcd4d.genieWriteContrast(0);                            // Set the display contrast to 0 initially
00090 
00091     lcd4d.genieWriteContrast(15);                           // Set the display contrast to 15 (full brightness)
00092 
00093     printf("Langsters's mbed Visi-Genie LED Flash demo \n\r");  // Display a welcome message on the serial monitor
00094 
00095     while(1) {                                                  // initialise an infinite while loop
00096 
00097         if(flag == 1) {                                          // Check if rockerSW object has been activated
00098             whiteLED = 1;                                        // turn real LED ON
00099             wait(flashRate);                                     // keep LED on for a short period of time
00100             whiteLED = 0;                                        // turn real LED ON
00101             wait(flashRate);                                     // turn LED off for a short period of time
00102 
00103         }
00104 
00105         if(flag == 0) {                                          // Check if rockerSW object has been deactivated
00106             whiteLED = 0;                                        // turn real LED OFF
00107         }
00108     }
00109 }
00110 
00111