add skeleton programs

2023-10-12 17:26:07 +01:00
parent e1631da36d
commit a92a378c0b
5 changed files with 781 additions and 0 deletions
--- a/Lab_1/skeleton_programs/TestEncoder.c
+++ b/Lab_1/skeleton_programs/TestEncoder.c
@@ -0,0 +1,87 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#define bool int
+#define byte unsigned char
+#define numChars  32
+
+void initialiseEncoderStateMachine();
+void updateEncoderStateMachine();
+
+// Here we are using global variables simply to be compatible with the Arduino program structure
+// This is REALLY bad practice so please don't do it otherwise!
+long int count = 0;
+long int error = 0;
+
+enum states {state1=1, state2, state3, state4};
+bool channelAState=0;
+bool channelBState=0;
+
+enum states state;
+char receivedChars[numChars]="00";   // an array to store the received data
+
+int main()
+{
+    // Replicates the setup in Arduino
+    printf("Enter a pair of characters representing initial states of channels A and B\n");
+    scanf("%s",receivedChars);
+    channelAState = receivedChars[0]!='0';
+    channelBState = receivedChars[1]!='0';
+
+    initialiseEncoderStateMachine();
+    printf("State %d, count %ld, error %ld\n", state, count, error);
+    printf("Enter a pair of characters representing channels A and B, enter 99 to end\n");
+
+    // Replicates the loop in Arduino
+    do
+    {
+        scanf("%s",receivedChars);
+        if (strcmp(receivedChars, "99")==0)
+        {
+            break;
+        }
+        channelAState = receivedChars[0]!='0';
+        channelBState = receivedChars[1]!='0';
+        updateEncoderStateMachine();
+        printf("State %d, count %ld, error %ld\n", state, count, error);
+
+    }
+    while(1);
+    return 0;
+}
+void initialiseEncoderStateMachine()
+{
+    /* If initially A is 0 and B is 0, system starts in State 1
+       If initially A is 1 and B is 0, system starts in State 2
+       If initially A is 1 and B is 1, system starts in State 3
+       If initially A is 0 and B is 1, system starts in State 4 */
+
+    if (channelAState)
+    {
+        if(channelBState)
+        {
+            state = state3;
+        }
+        /* else ....  lots of code goes here */
+    }
+}
+
+void updateEncoderStateMachine()
+{
+    switch (state)
+    {
+    case state1:
+        /* If A is 0 and B is 0, do nothing and stay in State 1
+           If A is 1 and B is 0, add 1 to main counter and go to State 2
+           If A is 0 and B is 1, subtract 1 to main counter and go to State 4
+           If A is 1 and B is 1, do nothing to main counter but add 1 to error counter and go to state 3 */
+
+        if (channelAState && !channelBState)
+        {
+            count++;
+            state = state2;
+        }
+        /* else ....  lots of code goes here */
+        break; /* don't forget break at the end of each case! */
+    }
+}