Diff: main.cpp

Revision:

0:52e7cb6008d3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jun 07 14:23:59 2017 +0000
@@ -0,0 +1,99 @@
+#include "mbed.h"
+
+const unsigned __int64 FORWARD = 1;
+const unsigned __int64 BACKWARD = 0;
+const unsigned __int64 LIGHTON = 1;
+const unsigned __int64 LIGHTOFF = 0;
+const unsigned __int64 SLOW = 0x4; //0100 = step 5
+const unsigned __int64 NORM = 0x9; //1001 = step 15
+const unsigned __int64 FAST = 0xE; //1110 = step 25
+const unsigned __int64 STOP = 0x1; //0001 = E-STOP
+
+DigitalOut Track(p20);
+DigitalIn sign2(p14);
+DigitalIn sign21(p15);
+DigitalIn sign22(p13);
+DigitalOut buzz(p21);
+
+void DCC_send_command(unsigned int address, unsigned int inst, unsigned int repeat_count){
+
+    unsigned __int64 command = 0x0000000000000000; // this is a 64-bit integer type, due to the packet size
+    unsigned __int64 temp_command = 0x0000000000000000;
+    unsigned __int64 prefix = 0x3FFF; // 14 1 bits as in the preamble of the data packet
+    unsigned int error = 0x00; // error byte
+    //calculate error detection byte with xor
+    error = address ^ inst;
+    // combine packet bits in basic DCC format
+    command = (prefix<<28)|(address<<19)|(inst<<10)|((error)<<1)|0x01;
+
+    int i = 0;
+
+    // repeat DCC command lots of times
+     while(i < repeat_count) {
+        temp_command = command;
+
+    //loops throught packet bits enconding and sending out digital pulses for a DCC command
+        for (int j=0; j<64; j++) {
+            if((temp_command&0x8000000000000000)==0) { //test packet bit
+
+                Track=0;
+                wait_us(100);
+                Track=1;
+                wait_us(100);
+
+            } else {
+
+                Track=0;
+                wait_us(58);
+                Track=1;
+                wait_us(58);
+
+            }
+
+            temp_command = temp_command<<1;
+        }
+        i++;
+    }
+}
+
+unsigned __int64 create_instruction(){
+    unsigned __int64 instruction = 0x0;
+    unsigned __int64 direction = FORWARD;
+    unsigned __int64 lights = LIGHTON;
+    unsigned __int64 speed = NORM;   
+    
+    return instruction = (0x01<<6)|(direction<<5)|(lights<<4)|speed;
+}
+
+int main(){
+    unsigned __int64 train1 = 0x1; 
+    unsigned __int64 train3 = 0x3;
+    unsigned __int64 def_repeat_count = 2;
+    unsigned __int64 instruction = 0x0;
+    buzz = 0;
+    
+    while(1){        
+        if(sign21){
+            instruction = (0x01<<6)|(FORWARD<<5)|(LIGHTOFF<<4)|SLOW;
+            buzz = 1;
+            DCC_send_command(train3, instruction, def_repeat_count);
+        } else if (sign2){
+            instruction = (0x01<<6)|(FORWARD<<5)|(LIGHTOFF<<4)|STOP;
+            buzz = 1;
+            DCC_send_command(train3, instruction, def_repeat_count);
+            wait(3);
+            
+            instruction = (0x01<<6)|(FORWARD<<5)|(LIGHTOFF<<4)|SLOW;
+            DCC_send_command(train3, instruction, def_repeat_count*20);
+            
+        } else if(sign22){
+            instruction = (0x01<<6)|(FORWARD<<5)|(LIGHTOFF<<4)|SLOW;
+            buzz = 1;
+            DCC_send_command(train3, instruction, def_repeat_count);
+        } else { 
+            instruction = (0x01<<6)|(FORWARD<<5)|(LIGHTON<<4)|FAST;
+            buzz = 0;
+            DCC_send_command(train3, instruction, def_repeat_count);
+        }
+    }
+}
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