Diff: main.cpp

Revision:

0:2b4bd6078ce3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Oct 14 10:45:17 2010 +0000
@@ -0,0 +1,130 @@
+/*********************************************************************
+  led_fsm      first mbed (lpc1768) program
+               Simple finite state machine for 
+               mbed's onboard LEDs sequencing
+
+ author: Ivan Vengust 'vitrzin'
+ last change: 14. oct. 2010               
+*********************************************************************/
+#include "mbed.h"
+
+// Function prototypes
+int fsm(void);
+int fsm1(void);
+
+// Global variables
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+
+// main ************************************************************
+int main() 
+{
+    int c(0), status;
+    
+    while(1) 
+    {
+        if (c > 2) // decide which sequence
+            status = fsm1(); // call sequence change
+        else
+            status = fsm();
+        
+        if (status == 0)
+        {
+            c = ++c % 5; // count finished sequences
+        }
+    }
+}
+
+/**********************************************************************
+  fsm()   Simple finite state machine
+           Each call to 'fsm' will advance state machine to next state
+          return value: current state 
+**********************************************************************/  
+int fsm(void) // light each led on turn - 4 states
+{
+    static int st(0); // sequence state
+    const int dly(200); // base delay - 200 ms
+
+    switch(st)
+    {
+       case 0:            //  state 0
+         led4 = 0; // change leds 
+         led3 = 0;
+         led2 = 0;
+         led1 = 1;
+         wait_ms(dly*3); // wait longer in initial state
+         ++st;     // switch to next state       
+         break;
+       case 1:            //  state 1 
+         led1 = 0;
+         led2 = 1;
+         ++st;
+         break;
+       case 2:            //  state 2
+         led2 = 0;
+         led3 = 1;
+         ++st;
+         break;
+       case 3:            //  state 3
+         led3 = 0;
+         led4 = 1;
+         st=0;    // switch to initial state       
+         break;
+    }
+    wait_ms(dly);
+    return st;
+}
+
+int fsm1(void) // light led column - 8 states
+{
+    static int st(0); // sequence state
+    const int dly(400); // base delay - 200 ms
+
+    switch(st)
+    {
+       case 0:            //  state 0
+         led4 = 0; // change leds 
+         led3 = 0;
+         led2 = 0;
+         led1 = 0;
+         wait_ms(dly*2); // wait longer in initial state
+         ++st;     // switch to next state       
+         break;
+       case 1:            //  state 1 
+         led4 = 1;
+         ++st;
+         break;
+       case 2:            //  state 2
+         led3 = 1;
+         ++st;
+         break;
+       case 3:            //  state 3
+         led2 = 1;
+         ++st;
+         break;
+       case 4:            //  state 4
+         led1 = 1;
+         ++st;
+         break;
+       case 5:            //  state 5
+         led1 = 0;
+         ++st;
+         break;
+       case 6:            //  state 6
+         led2 = 0;
+         ++st;
+         break;
+       case 7:            //  state 7
+         led3 = 0;
+         ++st;
+         break;
+       case 8:            //  state 8
+         led4 = 0;
+         st=0;    // switch to initial state       
+         break;
+    }
+    wait_ms(dly);
+    return st;
+}
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