Now functional, has issue with power loss events and desyncing from uc

1602LCD_char_display.c

@@ -96,26 +96,57 @@ void turn_on_lcd(void);
 void set_cgram_lcd_address(uint8_t addr);
 void set_ddram_lcd_address(uint8_t addr);
 void write_lcd_address(uint8_t addr);
-
+void set_entry_mode_increment_lcd(void);
+void set_entry_mode_decrement_lcd(void);
+void shift_right_lcd(void);
+void shift_left_lcd(void);
+void bbs(void);
+void clear_buf_lcd();
 
 
 int main() {
+    PORTD = 0x00;
+    DDRD = 0xff;
+
     //SETUP HERE.
+    led_blink();
+    led_blink();
+    init_lcd(); 
     _delay_ms(500); 
     
-    //setup for single line mode.
+    return_home_lcd();
-    //cmd_lcd(0x20);
-    //_delay_ms(1000);
-    //cmd_lcd(0x28);
 
     while(1) {
         led_blink();
         _delay_ms(1000);
-        cmd_lcd(0x20);
-        _delay_ms(1000);
-        cmd_lcd(0x28);
-        _delay_ms(2);
        
+        set_entry_mode_increment_lcd();
+        for(uint8_t i = 0; i < 15; i++) {
+            //shift_right_lcd();
+            write_lcd_address(0x7e);
+            _delay_ms(100);        
+        }
+        
+        set_entry_mode_decrement_lcd();
+        for(uint8_t i = 0; i < 15; i++) {
+            //shift_left_lcd();
+            write_lcd_address(0x7f);
+            _delay_ms(100);        
+        }
+        //set_cgram_lcd_address(0x00);
+        //set_entry_mode_increment_lcd();
+        //bbs();
+        _delay_ms(1000);
+        clear_lcd();
+        PORTD = 0x00;
+        led_blink();
+        led_blink();
+        led_blink();
+        _delay_ms(1000);
+        _delay_ms(1000);
+        _delay_ms(1000);
+        _delay_ms(1000);
+        _delay_ms(1000);
     }
     
     return 0;
@@ -127,21 +158,39 @@ int main() {
 //FUNCTIONS
 //#############################
 
-void init_lcd(void) {
-    //allow us to read pin7
-    DDRD = 0x00;
-    setbit(DDRD, BIT7_DDR);
-    while(PORTD & (1<<BIT7_PIN)){
-        led_blink(); 
-    }
 
-    DDRD = 0xff; //All output
+void bbs(void) {
-    _delay_ms(20);
+    _delay_ms(500);
+    write_lcd_address(0x42);
+    write_lcd_address(0x4f);
+    write_lcd_address(0x4f);
+    write_lcd_address(0x42);
+    write_lcd_address(0x49);
+    write_lcd_address(0x45);
+    write_lcd_address(0x53); 
+}
+
+/*
+ * Input: none
+ * Output: none
+ * Description: setsup the lcd for two line display and sets start posistion.
+ */
+void init_lcd(void) {
+    _delay_ms(500);
+    clear_buf_lcd();
+    clear_buf_lcd();
+    _delay_ms(10);
+    turn_on_lcd();
+    _delay_ms(10);
     
     set_lcd_two_line();
-    return_home_lcd();
+    _delay_ms(10);
-    clear_lcd();
     
+    //clear_lcd();
+    _delay_ms(5);
+    
+    //return_home_lcd();
+    _delay_ms(5);
 }
 
 
@@ -154,40 +203,127 @@ void set_lcd_two_line(void) {
     cmd_lcd(0x28);
 }
 
+/*
+ * Input: None
+ * Outupt: None
+ * Description: Sets the LCD into 4bit one line display mode.
+ */
 void set_lcd_one_line(void) {
     cmd_lcd(0x20);
 }
 
+
+/*
+ * Input: None
+ * Outupt: None
+ * Description: Sends the clear screen command to the LCD
+ */
 void clear_lcd(void) {
     cmd_lcd(0x01);
 }
 
+/*
+ * Input: None
+ * Outupt: None
+ * Description: Returns the LCD cursor to home position. 
+ */
 void return_home_lcd(void) {
     cmd_lcd(0x02);
 }
 
+/*
+ * Input: None
+ * Output: None
+ * Description: Shifts cusor to the right one char.
+ */
+void shift_right_lcd(void) {
+    cmd_lcd(0x14);
+}
+
+/*
+ * Input: None
+ * Output: None
+ * Description: Shifts cusor to the left one char.
+ */
+void shift_left_lcd(void) {
+    cmd_lcd(0x10);
+}
+
+
+
+
+/*
+ * Input: None
+ * Outupt: None
+ * Description: Toggles the LCD power state. 
+ */
 void turn_off_lcd(void) {
     cmd_lcd(0x08);
 }
 
-
+/*
+ * Input: None
+ * Outupt: None
+ * Description: Toggles the LCD power state.
+ */
 void turn_on_lcd(void) {
-    cmd_lcd(0x08);
+    cmd_lcd(0x0f);
 }
 
-
+/*
+ * Input: None
+ * Outupt: None
+ * Description:  
+ */
 void set_cgram_lcd_address(uint8_t addr) {
-;
+    uint8_t cmd = 0x40;
+    cmd |= addr;
+    cmd_lcd(cmd);
 }
 
-
+/*
+ * Input: None
+ * Outupt: None
+ * Description: 
+ */
 void set_ddram_lcd_address(uint8_t addr) {
-;
+    uint8_t cmd = 0x80;
+    cmd |= addr;
+    cmd_lcd(cmd);
 }
 
-
+/*
+ * Input: None
+ * Outupt: None
+ * Description: 
+ */
 void write_lcd_address(uint8_t addr) {
-;
+    setbit(PORTD, RS_PIN);
+    cmd_lcd(addr);
+    clearbit(PORTD, RS_PIN);
+    _delay_ms(10); 
+}
+
+void set_entry_mode_increment_lcd(void) {
+    cmd_lcd(0x06);
+}
+
+void set_entry_mode_decrement_lcd(void) {
+    cmd_lcd(0x04);
+}
+
+void clear_buf_lcd() {
+    DDRD = 0xff;
+    PORTD &=0x0f;
+    setbit(PORTD, ENA_PIN);
+    _delay_ms(5);
+    clearbit(PORTD, ENA_PIN);
+
+    _delay_ms(2); 
+
+    setbit(PORTD, ENA_PIN);
+    _delay_ms(5);
+    clearbit(PORTD, ENA_PIN);
 }
 
 
@@ -207,7 +343,7 @@ void cmd_lcd(uint8_t cmd) {
     PORTD |= (cmd & 0xf0);
     _delay_ms(1);
     clearbit(PORTD, ENA_PIN);
-    _delay_ms(2);
+    _delay_ms(3);
 
     //Send the second nibble and shift cmd by four.
     PORTD &= 0x0f;
@@ -215,21 +351,9 @@ void cmd_lcd(uint8_t cmd) {
     PORTD |= (cmd<<4);
     _delay_ms(1);
     clearbit(PORTD, ENA_PIN);
-    _delay_ms(2);
+    _delay_ms(3);
 }
 
-void cmd_nibble_lcd(uint8_t cmd) {
-    DDRD = 0xff;
-    PORTD &= 0x0f;
-
-    setbit(PORTD, ENA_PIN);
-    PORTD |= cmd;
-    _delay_ms(1);
-    clearbit(PORTD, ENA_PIN);
-    _delay_ms(1);
-}
-
-
 
 /*
  * Input: None