Diff: main.cpp

Revision:

0:fa4cf2a0048d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Jan 10 20:30:05 2015 +0000
@@ -0,0 +1,151 @@
+// Hello World! for the TextLCD
+
+#include "mbed.h"
+
+// +++++++++++++ timer section +++++++++++++++++ 
+Ticker can_ticker;
+Ticker adc_ticker;
+
+// ++++++++++++ pin section +++++++++++++++++++++
+// used as indicator
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+
+// voltage inputs
+AnalogIn ainp15 (p15);
+AnalogIn ainp16 (p16);
+AnalogIn ainp17 (p17);
+AnalogIn ainp18 (p18);
+AnalogIn ainp19 (p19);
+AnalogIn ainp20 (p20);
+
+// used to output the adc values on CAN bus
+CAN can1(p30, p29);
+ 
+ 
+// ++++++++++ variables section +++++++++++++++++++
+char can1_arrry[8];
+char can2_arrry[8];
+char can3_arrry[8];
+
+// used to convert float values into char segments for CAN transmission 
+union { float a; char b[4];} adcvar1;
+union { float a; char b[4];} adcvar2;
+union { float a; char b[4];} adcvar3;
+union { float a; char b[4];} adcvar4;
+union { float a; char b[4];} adcvar5;
+union { float a; char b[4];} adcvar6;
+ 
+  
+// ++++++++++++++ function section ++++++++++++++++
+
+void send_msg() 
+{    
+    // send the can messages with the adc vales each 10 ms
+
+    if(can1.write(CANMessage(0x200, can1_arrry, 8))) 
+    {
+      // show success
+      led2 = !led2;
+    }
+    else
+      led1 = 0;
+      
+      
+    if(can1.write(CANMessage(0x201, can2_arrry, 8))) 
+    {
+      // show success
+      led3 = !led3;
+    }
+    else
+      led1 = 0;      
+    
+    
+    if(can1.write(CANMessage(0x202, can3_arrry, 8))) 
+    {
+      // show success
+      led4 = !led4;
+    }
+    else
+      led1 = 0;      
+            
+      
+} // void send_msg()
+ 
+ 
+void read_adc()
+{     
+     adcvar1.a = ainp15;
+     adcvar2.a = ainp16;
+     adcvar3.a = ainp17;
+     adcvar4.a = ainp18;
+     adcvar5.a = ainp19;
+     adcvar6.a = ainp20;
+ 
+     // adc values from pin15 and pin16 are prepared for transmission
+     can1_arrry[0] = adcvar1.b[0];
+     can1_arrry[1] = adcvar1.b[1];
+     can1_arrry[2] = adcvar1.b[2];
+     can1_arrry[3] = adcvar1.b[3];
+     can1_arrry[4] = adcvar2.b[0];
+     can1_arrry[5] = adcvar2.b[1];
+     can1_arrry[6] = adcvar2.b[2];
+     can1_arrry[7] = adcvar2.b[3];
+ 
+     // adc values from pin17 and pin18 are prepared for transmission
+     can2_arrry[0] = adcvar3.b[0];
+     can2_arrry[1] = adcvar3.b[1];
+     can2_arrry[2] = adcvar3.b[2];
+     can2_arrry[3] = adcvar3.b[3];
+     can2_arrry[4] = adcvar4.b[0];
+     can2_arrry[5] = adcvar4.b[1];
+     can2_arrry[6] = adcvar4.b[2];
+     can2_arrry[7] = adcvar4.b[3];
+ 
+     // adc values from pin19 and pin20 are prepared for transmission
+     can3_arrry[0] = adcvar5.b[0];
+     can3_arrry[1] = adcvar5.b[1];
+     can3_arrry[2] = adcvar5.b[2];
+     can3_arrry[3] = adcvar5.b[3];
+     can3_arrry[4] = adcvar6.b[0];
+     can3_arrry[5] = adcvar6.b[1];
+     can3_arrry[6] = adcvar6.b[2];
+     can3_arrry[7] = adcvar6.b[3];
+      
+} // void read_adc()
+
+ 
+ // ++++++++++++ main section ++++++++++++++++++
+ 
+int main() 
+{
+    // leds are switched off at start
+    led1 = 0;
+    led2 = 0;
+    led3 = 0;
+    led4 = 0;
+    
+    // set can bus speed (not all possible combinations can be written to a common CAN controller (btr0 and btr1 registers))
+    can1.frequency (125000);
+   
+    // configure timer for can message transmission
+    can_ticker.attach(&send_msg, 0.01);
+    
+    // configure timer to get analogg inputs    
+    adc_ticker.attach(&read_adc, 0.01);
+    
+    // dummy message to receive a CAN message
+    CANMessage msg;
+    
+    while(1)
+    {
+        if(can1.read(msg))
+        {
+              // switch on led1, when a message has been received
+              led1 = !led1;
+        } 
+        wait(0.2);
+    }
+} // main
\ No newline at end of file