rekahsoft
/
avr-lcd-lib
1
1
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Tested operational 4-bit mode 

Cleaned up a few comments and tested and verified operation of 4-bit mode.

Signed-off-by: Collin J. Doering <collin.doering@rekahsoft.ca>
This commit is contained in:
Collin J. Doering 2015-10-02 02:46:23 -04:00
parent 0a36d6cf77
commit 04be2b85da
2 changed files with 28 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
lcdLib.c
View File

@ -269,24 +269,22 @@ static inline void softwareLCDInitPulse(void) {
void initLCD (void) {
enableLCDOutput();
// Wait minimum 15ms as per datasheet
_delay_us(LCD_INIT_DELAY0);
_delay_us(LCD_INIT_DELAY0); // Wait minimum 15ms as per datasheet
softwareLCDInitPulse();
// Wait minimum 4.1ms as per datasheet
_delay_us(LCD_INIT_DELAY1);
_delay_us(LCD_INIT_DELAY1); // Wait minimum 4.1ms as per datasheet
softwareLCDInitPulse();
_delay_us(LCD_INIT_DELAY2); // Wait minimum 100us as per datasheet
softwareLCDInitPulse();
// Wait minimum 100us as per datasheet
_delay_us(LCD_INIT_DELAY2);
softwareLCDInitPulse();
// Function set (2 lines with 5x7 dot character font)
#if defined (FOUR_BIT_MODE) || defined (EIGHT_BIT_ARBITRARY_PIN_MODE)
// Function Set (4-bit interface; 2 liens with 5x7 dot character font)
writeLCDNibble_(CMD_INIT_FOUR_BIT);
writeLCDInstr_(CMD_INIT_FOUR_BIT | (1 << INSTR_FUNC_SET_N));
#else
// Function set (8-bit interface; 2 lines with 5x7 dot character font)
// RS=RW=0, DBUS=b00111000,0x38
writeLCDInstr_(INSTR_FUNC_SET | (1 << INSTR_FUNC_SET_DL) | (1 << INSTR_FUNC_SET_N));
#endif
/* BF now can be checked */

22
lcdLib.h
View File

@ -46,7 +46,7 @@
//#define EIGHT_BIT_ARBITRARY_PIN_MODE
// LCD in 4-bit mode (default is 8 bit mode)
//#define FOUR_BIT_MODE
#define FOUR_BIT_MODE
// Mode sanity check
#if defined (EIGHT_BIT_ARBITRARY_PIN_MODE) && defined (FOUR_BIT_MODE)
@ -68,9 +68,18 @@
#define LCD_ENABLE_PORT PORTD
#define LCD_ENABLE_DDR DDRD
/* Mode specific settings */
// Screen characteristics (unused) TODO
#define LCD_NUMBER_OF_LINES 2
#define LCD_CHARACTERS_PER_LINE 20
#define LCD_CHARACTER_FONT
/*
Mode specific settings
*/
/* Default Mode */
// Default Mode
// LCD data bus PORT, PIN and DDR.
#define LCD_DBUS_PORT PORTB
@ -81,7 +90,8 @@
#define LCD_BF PB7
// EIGHT_BIT_ARBITRARY_PIN_MODE specific settings
/* EIGHT_BIT_ARBITRARY_PIN_MODE specific settings */
#ifdef EIGHT_BIT_ARBITRARY_PIN_MODE
#define LCD_DBUS0 PB0
#define LCD_DBUS0_PORT PORTB
@ -124,7 +134,8 @@
#define LCD_DBUS7_PIN PINB
#endif
// FOUR_BIT_MODE specific settings
/* FOUR_BIT_MODE specific settings */
#ifdef FOUR_BIT_MODE
#define LCD_DBUS4 PB4
#define LCD_DBUS4_PORT PORTB
@ -170,6 +181,7 @@
// Simple commands with no options
#define CMD_INIT 0x30
#define CMD_INIT_FOUR_BIT 0x20
#define CMD_CLEAR_DISPLAY 0x01
#define CMD_RETURN_HOME 0x02