Some cleanup

Signed-off-by: Collin J. Doering <collin.doering@rekahsoft.ca>

lcdLib.c

@@ -90,6 +90,18 @@ void writeCharToLCD(char c) {
   writeCharToLCD_(c);
 }
 
+void writeStringToLCD(const char* str) {
+  while (*str != '\0') {
+    writeCharToLCD(*str);
+    str++;
+  }
+}
+
+void clearScreen(void) {
+  writeLCDInstr(CMD_CLEAR_SCREEN);
+  _delay_us(LCD_CLEAR_SCREEN_DELAY);
+}
+
 char readCharFromLCD(void) {
   loop_until_LCD_BF_clear(); // Wait until LCD is ready for new instructions
 
@@ -165,11 +177,13 @@ void initLCD (void) {
   flashLED(5); // DEBUG
 }
 
-void quickInitLCD(void) {
+void initLCDByInternalReset(void) {
   enableLCDOutput();
   writeLCDInstr_(0x38);
   writeLCDInstr_(0x0F);
   writeLCDInstr_(0x06);
+  writeLCDInstr_(0x01);
+  _delay_ms(16);
 
   /* writeLCDInstr_(0x01); // Clear display */
   /* writeLCDInstr_(0x30); // RS=RW=0, 0b00110000 */

lcdLib.h

@@ -24,7 +24,7 @@
 // Includes
 #include <avr/io.h>
 
-// Constants
+// LCD data bus PORT, PIN and DDR
 #define LCD_DBUS_PORT PORTB
 #define LCD_DBUS_DDR  DDRB
 #define LCD_DBUS_PIN  PINB
@@ -32,20 +32,35 @@
 #define LCD_CTRL_PORT PORTD
 #define LCD_CTRL_DDR  DDRD
 
-#define LCD_RS       PD2
-#define LCD_RW       PD3
-#define LCD_ENABLE   PD4
+#define LCD_RS        PD2
+#define LCD_RW        PD3
+#define LCD_ENABLE    PD4
 
-#define LCD_BF       PB7
+#define LCD_DBUS0     PB0
+#define LCD_DBUS1     PB1
+#define LCD_DBUS2     PB2
+#define LCD_DBUS3     PB3
+#define LCD_DBUS4     PB4
+#define LCD_DBUS5     PB5
+#define LCD_DBUS6     PB6
+#define LCD_DBUS7     PB7
+#define LCD_BF        PB7
 
-#define LCD_DELAY    50
+// LCD delays (in microseconds)
+#define LCD_DELAY              50
+#define LCD_CLEAR_SCREEN_DELAY 16000
+#define LCD_SEND_DELAY         40 // unused
+
+// LCD Commands
+#define CMD_CLEAR_SCREEN 0x01
+#define CMD_RETURN_HOME  0x02
+
+//------------------------------------
 
 #define STATUS_LED_PORT PORTC
 #define STATUS_LED_DDR  DDRC
 #define STATUS_LED      PC5
 
-//------------------------------------
-
 // Function definitions
 void flashLED(uint8_t times);
 
@@ -63,12 +78,16 @@ void writeCharToLCD_(char c);
 
 void writeCharToLCD(char c);
 
+void writeStringToLCD(const char* str);
+
+void clearScreen(void);
+
 char readCharFromLCD(void);
 
 /*
   Do software initialization as specified by the datasheet
 */
-void initLCD (void);
+void initLCD(void);
 
-void quickInitLCD(void);
+void initLCDByInternalReset(void);
 

lcdOutput.c

@@ -37,32 +37,24 @@ int main(void) {
   
   STATUS_LED_DDR |= 1 << STATUS_LED; // DEBUG
 
+  const char* data[4] = { "Hello there friend!!",
+                          "Anyways, I must go..",
+                          "Isn't it a nice day.",
+                          "To a midnight show;)"  };
+
   initLCD();
-  //quickInitLCD();
+  //initLCDByInternalReset();
   
   while (1) {
-    writeCharToLCD('H');
-    writeCharToLCD('e');
-    writeCharToLCD('l');
-    writeCharToLCD('l');
-    writeCharToLCD('o');
-    writeCharToLCD(' ');
-    writeCharToLCD('t');
-    writeCharToLCD('h');
-    writeCharToLCD('e');
-    writeCharToLCD('r');
-    writeCharToLCD('e');
-    writeCharToLCD(' ');
-    writeCharToLCD('f');
-    writeCharToLCD('r');
-    writeCharToLCD('i');
-    writeCharToLCD('e');
-    writeCharToLCD('n');
-    writeCharToLCD('d');
-    writeCharToLCD('!');
+    for (uint8_t i = 0; i < 4; i++) {
+      writeStringToLCD(data[i]);
+    }
+    _delay_ms(5000);
+    clearScreen();
+
 
     //flashLED(5); // DEBUG
-    _delay_ms(5000);
+    _delay_ms(3000);
   }
 
   return 0;