Diff: main.cpp

Revision:

1:5d1abf5d24a5

Parent:

0:9b09ea979c72

--- a/main.cpp	Mon Jul 31 18:17:51 2017 +0000
+++ b/main.cpp	Mon Jul 31 21:07:52 2017 +0000
@@ -1,32 +1,122 @@
 #include "mbed.h"
+#include "TextLCD.h"
+
+#define ENABLED                     1
+#define DISABLED                    0
+
+#define ENABLE_SERIAL_OUTPUT        ENABLED
+#define ENABLE_DISPLAY              ENABLED
+
+#define DEBOUNCE_TIME_MS            50
+#define POTMETER_SAMPLES            10
+#define MIN_WELDING_TIME_MS         40
+#define WELDING_TIME_MS             3000
+#define POTMETER_UPDATE_TIME_MS     250
+
+#if ENABLE_SERIAL_OUTPUT
+Serial pc(USBTX, USBRX);
+#endif
 
 DigitalOut myled(LED1);
-DigitalIn Pedel(PA_0);
-AnalogIn Pot(PA_7);
-DigitalOut Relay(PB_0);
+DigitalIn pedal(PB_6);
+AnalogIn pot(PA_0);
+DigitalOut relay(PB_0);
+
+#if ENABLE_DISPLAY
+TextLCD lcd(PB_1, PF_1, PA_8, PA_11, PB_5, PB_4); // rs, e, d4-d7
+DigitalOut rw(PF_0);
+#endif
+
+bool bActive = false;
+unsigned int runTime = 0;
+Ticker potUpdateTicker;
+
+void update_time(void);
+unsigned int get_time(void);
 
-int main() {
-    Relay = 1 ;    
-    float Time = 0 ; 
+int main()
+{    
+    // Initialize pedal
+    pedal.mode(PullUp);
+    
+#if ENABLE_SERIAL_OUTPUT
+    // Initialize Serial
+    pc.baud(115200);
+    pc.printf("Spot Welder 3000\r\n");
+#endif
+    
+    // Initialize time
+    get_time();
+    
+    // Initialize relay output
+    relay = 1;
     
-    while(1) {
-      /*  myled = 1; // LED is ON
-          wait(0.2); // 200 ms
-          myled = 0; // LED is OFF
-          wait(1.0); // 1 sec
-      */   
-        if (Pedel == 0) // Kontrol af pedal tryk
+#if ENABLE_DISPLAY
+    // Initialize LCD
+    rw = 0;
+    lcd.cls();
+    lcd.locate(0,0);
+    lcd.printf("Spot Welder 3000");    
+    lcd.locate(0,1);
+    lcd.printf("Time: %4d ms", runTime);
+#endif
+
+    // Start update time
+    potUpdateTicker.attach_us(&update_time, POTMETER_UPDATE_TIME_MS * 1000);
+    
+    while (1)
+    {
+        // Check for pedal press
+        if (pedal == 0)
         {
-           // Time = Pot;
-            Relay = 0;  
-            myled = 1; // LED is ON   
-            wait(Time); 
+            bActive = true;
+            
+            // Debounce
+            wait_ms(DEBOUNCE_TIME_MS);
+            if (pedal == 0)
+            {
+#if ENABLE_SERIAL_OUTPUT
+                pc.printf("Welding for %d ms\r\n", runTime);
+#endif
+                relay = 1;
+                myled = 1; // LED is ON   
+                wait_ms(runTime);
+            }
         }
-                  
-        else 
+        
         myled = 0; // LED is OFF
-        Relay = 1; 
+        relay = 0;
+        bActive = false;
         
-        
+        // One-shot
+        while (pedal == 0)
+        {
+            wait_us(1);
+        }
     }
 }
+
+void update_time(void)
+{
+    if (not bActive)
+    {
+        get_time();
+#if ENABLE_SERIAL_OUTPUT
+        lcd.locate(6,1);
+        lcd.printf("%4d", runTime);
+#endif
+    }
+}
+
+unsigned int get_time(void)
+{
+    float potSum = 0;
+    
+    for (uint8_t i = 0; i < POTMETER_SAMPLES; i++)
+    {
+        potSum += pot.read();
+    }
+    
+    runTime = MIN_WELDING_TIME_MS + (unsigned int)((potSum / POTMETER_SAMPLES) * WELDING_TIME_MS);
+    return runTime;
+}
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