Implemented SD card writing, updated TODO.

TODO

@@ -18,7 +18,7 @@ Buttons							DONE
 Voltage measurement				DONE
 Load line on/off				DONE
 Current measurement
-SD card
+SD card							DONE
 Bluetooth
 
 

firmware/v01/Makefile

@@ -3,7 +3,9 @@
 BOARD_TAG	= pro
 BOARD_SUB	= 8MHzatmega328
 USER_LIB_PATH += /home/ricardo/Arduino/libraries
-ARDUINO_LIBS += LiquidCrystal
+ARDUINO_LIBS += LiquidCrystal \
+				SPI \
+				SD
 ARDUINO_DIR  = /home/ricardo/arduino-1.8.5
 MONITOR_PORT = /dev/ttyUSB0
 include /usr/share/arduino/Arduino.mk

firmware/v01/v01.ino

@@ -8,8 +8,10 @@ By Jony Silva
 Tue Jun 12 14:56:12 GMT 2018
 *********************************************************************/
 
-#include <avr/sleep.h>
+// Libraries to be included, non native libraries need to be included in the Makefile
-#include <LiquidCrystal.h>
+#include <LiquidCrystal.h>			// Handles the connection and communications with the LCD display
+#include <SPI.h>					// Handles the SPI connection to the SD card
+#include <SD.h>						// Handles communication routines with the SD card
 
 
 // Configuration of pins, insert here arduino pin numbers only(not fisical)----------------------------
@@ -28,32 +30,45 @@ LiquidCrystal lcd(7, 6, 2, 3, 4, 5);	// LCD screen pins, LiquidCrystal(rs, enabl
 #define battery_volt 3				// Parameter position where battery voltage value is hold
 #define voltage_1 0					// Parameter position where voltage one value is hold
 #define voltage_2 1					// Parameter position where voltage two value is hold
-#define numOfScreens 6					// Number of screen menus, select here and rearrange String screens
+#define numOfScreens 7				// Number of screen menus, select here and rearrange String screens
+File myFile;
 //----------------------------------------------------------------------------------------------------------
 
 
-// Macros to read the buttons --------------------------------
+// Macros --------------------------------------------------------
 #define rLEFT digitalRead(LEFT)     // Read button Left
 #define rRIGHT digitalRead(RIGHT)   // Read button Right
 #define rACT digitalRead(ACT)		// Read button Action
-//------------------------------------------------------------
+#define sd_not_in 0					// SD card is not inserted
+#define sd_in 1						// SD card is inserted
+#define file_fail 2					// Can't write to file
+#define load_off 0					// Turn off the load
+#define load_on 1					// Turn on the load
+#define off 0						// off is always zero
+#define on 1						// on is always one
+//----------------------------------------------------------------
 
 
-// Variables ------------------------------------------------------------------------------
+// Variables --------------------------------------------------------------------------------------------------------------
-bool sd_status = 0;
+bool sd_rw = off;					// Holds the state of read/write of the card
-bool load_status = 0;
+bool load_status = load_off;		// Holds the state of on/off of the load
+int sd_status = sd_not_in;			// Holds information about the sd card
 
-int currentScreen = 0;
+int currentScreen = 0;				// Current display menu
+
+// String with the menus to be displayed
 String screens[numOfScreens][2] = {{"Voltage 1","Volts"}, {"Voltage 2","Volts"},
-	{"Load current","Amps"},{"Batt Voltage","volts"}, {"SD Logging", ""}, {"Load", ""}};
+	{"Load current","Amps"},{"Batt Voltage","volts"}, {"SD Logging", ""}, {"Load", ""}, {"SD card", ""}};
-String parameters_sd[2] = {"No","Yes"};
+
-String parameters_load[2] = {"Off","On"};
+String parameters_sd[2] = {"No","Yes"};									// String to display the sd card logging
-float parameters[4];
+String parameters_load[2] = {"Off","On"};								// String to display the load state
+String sd_card[3] = {"Card missing","Card inserted","File Write fail"}; // String to display the sd card state
+float parameters[4];													// Parameters of the several voltages and current
 
 float denominator;
 int resistor1 = 22000;				// Resistor one of voltage divider
 int resistor2 = 2200;				// Resistor two of voltage divider
-// ----------------------------------------------------------------------------------------
+// ------------------------------------------------------------------------------------------------------------------------
 
 
 
@@ -90,26 +105,51 @@ void setup()
 	TIMSK1 |= (1 << OCIE1A);  // enable timer compare interrupt
 	interrupts();             // enable all interrupts
 	// ----------------------------------------------------------
+
+	if (SD.begin())				// Initiate SD card
+	{
+		sd_status = sd_in;		// If sd card is initiated successfully change variable status to sd_in
+	}
+	else {
+		sd_status = sd_not_in;	// If sd card is not initiated change variable status to sd_not_in
+	}
 }
 
 
 // Timer compare interrupt service routine --
 ISR(TIMER1_COMPA_vect)
 {
-	menuState();
+	menuState();							// Read buttons act accordingly and update menus
-	digitalWrite(load_line, load_status);
+	digitalWrite(load_line, load_status);	// Turn load on or off depending on the load_status
 }
 //-------------------------------------------
 
 
 void loop()
 {
-	parameters[battery_volt] = volt_pin(v_batt);
+	parameters[battery_volt] = volt_pin(v_batt);		// Update Battery voltage value
-	parameters[voltage_1] = volt_pin(volt_1);
+	parameters[voltage_1] = volt_pin(volt_1);			// Update voltage one value
-	parameters[voltage_2] = volt_pin(volt_2);
+	parameters[voltage_2] = volt_pin(volt_2);			// Update voltage two value
 
-	printScreen();
+
-	delay(4000);
+	if (sd_rw == on)									// If sd_rw value is turned on
+	{
+		myFile = SD.open("measure.txt", FILE_WRITE);	// Open file measure.txt for writing
+		if (myFile)										// if succeds
+		{
+			myFile.println(volt_pin(v_batt));			// Write to card battery voltage
+			myFile.println(volt_pin(volt_1));			// Write to card voltage one
+			myFile.println(volt_pin(volt_2));			// Write to card voltage two
+			myFile.println("");							// Write to card an empty line
+			myFile.close();								// Close file
+		}
+		else
+		{
+			sd_status = file_fail;						//
+		}
+	}
+	printScreen();										// Refresh screen and print current menu and values
+	delay(5000);										// Repeat the main loop every 5 seconds
 }
 
 void menuState()
@@ -126,7 +166,7 @@ void menuState()
 			currentScreen++;
 		}
 		while (!rRIGHT);								// Check if button is still pressed do nothing
-		printScreen();
+		printScreen();									// Refresh screen and print current menu and values
 	}
 
 	if (!rLEFT)
@@ -140,21 +180,21 @@ void menuState()
 			currentScreen--;
 		}
 		while (!rLEFT);									// Check if button is still pressed do nothing
-		printScreen();
+		printScreen();									// Refresh screen and print current menu and values
 	}
 
 	if (!rACT)
 	{
 		if (currentScreen == 4)
 		{
-			sd_status = !sd_status;
+			sd_rw = !sd_rw;
 		}
 		if (currentScreen == 5)
 		{
 			load_status = !load_status;
 		}
 		while (!rACT);									// Check if button is still pressed do nothing
-		printScreen();
+		printScreen();									// Refresh screen and print current menu and values
 	}
 }
 
@@ -167,7 +207,7 @@ void printScreen()
 
 	if (currentScreen == 4)
 	{
-		lcd.print(parameters_sd[sd_status]);
+		lcd.print(parameters_sd[sd_rw]);
 	}
 	else if (currentScreen == 5)
 	{
@@ -175,7 +215,7 @@ void printScreen()
 	}
 	else if (currentScreen == 6)
 	{
-		lcd.print(screens[currentScreen][1]);
+		lcd.print(sd_card[sd_status]);
 	}
 	else
 	{