Diff: main.cpp

Revision:

2:18d8f9d3286c

Parent:

1:7749656733dd

Child:

3:0bad8eec80ee

--- a/main.cpp	Mon Aug 24 05:29:53 2020 +0000
+++ b/main.cpp	Mon Aug 24 08:27:27 2020 +0000
@@ -144,6 +144,16 @@
     int ds18b20_result = 0;
     float temp;
     
+    //Initialize sensor
+    if(ds1820_sensor.begin()) {
+        ds1820_sensor.startConversion();     // start temperature conversion
+        ThisThread::sleep_for(1);  // let DS1820 complete the temperature conversion
+        pc.printf("Initial DS18B20 temp = %3.2f\r\n", ds1820_sensor.read());     // read temperature
+    //Without temperature sensor, charging will not work (unless minimum temperature set below -310.0)
+    }else{
+        pc.printf("No DS1820 sensor found!\r\n");
+    }
+    
     while(true)
     {
         ds1820_sensor.startConversion();   // start temperature conversion from analog to digital
@@ -173,15 +183,20 @@
 }
 
 // Detect battery presence by voltage activity
-bool batteryPresent()
+void BatteryPresenceThread()
 {
-    if(bat_voltage_avg > MIN_DETECT_VOLTAGE)
+    while(true)
     {
-        return true;   
-    }
-    else
-    {
-        return false;   
+        if(bat_voltage_avg > MIN_DETECT_VOLTAGE)
+        {
+            batteryPresenceState = true;   
+        }
+        else
+        {
+            batteryPresenceState = false;   
+        }
+        
+        ThisThread::sleep_for(250);
     }
 }
 
@@ -198,15 +213,16 @@
             //First check conditions to see if charging should be enabled or disabled
             bool temperature_en = ( ( ds18b20_temperature < MAX_TEMPERATURE ) && ( ds18b20_temperature > MIN_TEMPERATURE ) );
             bool voltage_en = ( ( bat_voltage_avg  < MAX_VOLTAGE ) && ( bat_voltage_avg > MIN_VOLTAGE ) );
-            bool presence_en = batteryPresent();
+            bool presence_en = batteryPresenceState;
             bool charge_time_exceeded = ( (Kernel::get_ms_count() - chargeStartTime ) > MAX_TIME_ms);
             
             //Charging can be enabled if battery is present, no protections triggered, and user starts the charge
             if(enableCharging == false)
             {                
-                if( voltage_en && temperature_en && presence_en && buttonPressed )
+                if( voltage_en && temperature_en && presence_en && !charge_time_exceeded && buttonPressed )
                 {
                     enableCharging = true;
+                    chargeStartTime = Kernel::get_ms_count();
                     buttonPressed = false;
                 }
             }
@@ -214,7 +230,7 @@
             else
             {
                 //Disable charging if any protection condition is triggered
-                if( !voltage_en || !temperature_en || !presence_en )
+                if( !voltage_en || !temperature_en || !presence_en || charge_time_exceeded )
                 {
                     enableCharging = false;
                 }
@@ -242,7 +258,7 @@
             //Update flag that indicates state of TP4056 CE pin to other threads
             TP4056ChargingState = enableCharging;
         
-           ThisThread::sleep_for(100);
+            ThisThread::sleep_for(100);
        }
 }
 
@@ -266,9 +282,12 @@
         
         
         stream.str("");
-        stream << std::fixed << std::setprecision(4) << vddref_voltage;
-        std::string vddref_output = "VDDREF: " + stream.str();
-        oled_i2c.drawString(0,16*2, vddref_output.c_str() );
+        stream << std::fixed << std::setprecision(4) << ds18b20_temperature;
+        std::string ds18_str = "Temp: " + stream.str();
+        oled_i2c.drawString(0,16*2, ds18_str.c_str() );
+        //stream << std::fixed << std::setprecision(4) << vddref_voltage;
+        //std::string vddref_output = "VDDREF: " + stream.str();
+        //oled_i2c.drawString(0,16*2, vddref_output.c_str() );
         
         
         oled_i2c.display();
@@ -291,10 +310,18 @@
     //https://forums.mbed.com/t/how-to-configure-open-drain-output-pin-on-stm32/7007
     toggleOut.mode(OpenDrainNoPull);
     
+    // TEMPERATURE INPUT THREAD
+    Thread ds18b20_temperature_thread;
+    ds18b20_temperature_thread.start(TemperatureInputThread);
+    
     // CHARGE ENABLE CONTROL THREAD
     Thread tp4056_control_thread;
     tp4056_control_thread.start(TP4056ControlThread);
     
+    // PRESENCE DETECTION THREAD
+    Thread bat_presence_thread;
+    bat_presence_thread.start(BatteryPresenceThread);
+    
     //OLED 128x64 INIT AND THREAD
     //initialize ssd1306 on i2c0
     oled_i2c.init();
@@ -349,8 +376,10 @@
         pc.printf("ADC0 1s min: %6.4f\r\n", bat_voltage_min);
         pc.printf("ADC0 1s max: %6.4f\r\n", bat_voltage_max);
         pc.printf("ADC0 1s avg: %6.4f\r\n", bat_voltage_avg);
+        pc.printf("ADC0 time (nominal 1000ms): %llu\r\n", (now-lastADCStartTime));
         pc.printf("VDDREF Reading: %6.4f\r\n", vddref_voltage);
-        pc.printf("ADC0 time (nominal 1000ms): %llu\r\n", (now-lastADCStartTime));
+        pc.printf("Temp: %6.4f\r\n", ds18b20_temperature);
+        pc.printf("Bat present: %d\r\n", batteryPresenceState);
         
     }