main.cpp

00001 /* A port test of the arduino voltmeter 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
00009 
00010 The reset pin is not connected as reset function is not implemented
00011 
00012 Pin 15 of the mbed has a potentiometer wiper connected to it
00013 The other connections of the potentiometer are connected to +3.3V
00014 and 0V 
00015 
00016 For setting up the display in Visie-Genie
00017 
00018 The display has an angular meter objecr, a LED digits object, two buttons 
00019 and three static text objects.
00020 
00021 The program sends digital voltage readings to the LED digits and 
00022 angular meter of the display module.
00023 
00024 The On and Off button has been set to report on change
00025 
00026 The baud rate of the display is set to 115200 baud
00027 
00028 */
00029 
00030 #include "mbed.h"
00031 #include "mbed_genie.h"
00032 
00033 DigitalOut myled(LED1);   //LED 1 for indication
00034 
00035 AnalogIn voltReading(p15);  //Potentiometer wiper connected to pin 15      
00036 
00037 int flag = 0;        //holds the "power status" of the voltmeter. flag = 0 means voltmeter is "off", flag = 1 means the voltmeter is "on".
00038 float voltMeter;       //holds the digital voltage value to be sent to the angular meter
00039 float voltLED;         //holds the digital voltage value to be sent to the LED digits
00040 
00041 //Event handler for the 4d Systems display
00042 void myGenieEventHandler(void) 
00043 {
00044   genieFrame Event;
00045   genieDequeueEvent(&Event);
00046   //event report from an object
00047   if(Event.reportObject.cmd == GENIE_REPORT_EVENT)
00048   {
00049     /*
00050     for example here we check if we received a message from 4dbuttons objects
00051     the index is the button number, refer to the 4dgenie project to know the index
00052     */
00053     if (Event.reportObject.object == GENIE_OBJ_4DBUTTON)                // If the Reported Message was from a button
00054     {
00055         if (Event.reportObject.index == 0) 
00056         {
00057              //printf("Off Button pressed!\n\r");
00058              wait(0.2);
00059              flag=1;
00060         }
00061         if (Event.reportObject.index == 1) 
00062         {
00063              //printf("On Button pressed!\n\r");
00064              wait(0.2);
00065              flag=0;           
00066         }
00067     }
00068   }
00069   
00070   //Cmd from a reported object (happens when an object read is requested)
00071   // if(Event.reportObject.cmd == GENIE_REPORT_OBJ)
00072   // {
00073  
00074   // }
00075 
00076 }
00077  
00078 int main() 
00079 
00080 { 
00081     SetupGenie();
00082     genieAttachEventHandler(&myGenieEventHandler);
00083     //genieResetDisplay();
00084  
00085     printf("Langsters's mbed Visi-Genie Voltmeter demo \n\r");
00086  
00087     genieWriteContrast(15); //set screen contrast to full brightness
00088  
00089             while(1) 
00090             {   
00091                 //voltLED = 0;
00092                 
00093                 if (flag == 1)
00094                     {
00095                         //printf("Flag status: %d \r\n", flag);
00096                         wait (0.1); 
00097                         voltLED = voltReading; 
00098                         wait (0.1);    
00099                         //printf("Volt bit Reading: %f \n\r",voltLED);
00100                         voltLED = voltLED * 3.3;                                    //convert float reading to voltage
00101                         //printf("voltLED: %f\r\n",voltLED);
00102                 
00103                         voltLED = voltLED * 1000;
00104                         genieWriteObject(GENIE_OBJ_LED_DIGITS, 0x00, voltLED);      //write to Leddigits0 the value of voltLED 
00105                         wait (0.1);
00106                         
00107                         voltMeter = voltLED/100;
00108                         genieWriteObject(GENIE_OBJ_ANGULAR_METER, 0x00, voltMeter); //write to Angularmeter0 the value of voltMeter     
00109                     }
00110                 
00111                 else if(flag == 0)
00112                     
00113                     {
00114                         //printf("Flag status: %d \r\n", flag); 
00115                         wait (0.1);
00116                         voltLED = 0;
00117                         genieWriteObject(GENIE_OBJ_LED_DIGITS, 0x00, 0);      //write to Leddigits0 the value of voltLED 
00118                         wait (0.1);
00119                         
00120                         //voltMeter = voltLED/100;
00121                         genieWriteObject(GENIE_OBJ_ANGULAR_METER, 0x00, 0); //write to Angularmeter0 the value of voltMeter   
00122                     }                            
00123                                 
00124             }
00125       
00126 }