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avr-lcd-lib
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Fixed busy flag check 

Inspired by
http://web.alfredstate.edu/weimandn/programming/lcd/ATmega328/LCD_code_index.html.
Forgot about the 'data hold time', 'address hold time' and 'enable cycle
time'. These delays should eventually be implemented as preprocessor constants.

Signed-off-by: Collin J. Doering <collin.doering@rekahsoft.ca>
This commit is contained in:
Collin J. Doering 2015-10-06 03:34:39 -04:00
parent abacb2b30a
commit 435c8eb07b
2 changed files with 19 additions and 5 deletions
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22
lcdLib.c
View File

@ -55,6 +55,8 @@ void clkLCD(void) {
}
void loop_until_LCD_BF_clear(void) {
uint8_t bf;
LCD_RS_PORT &= ~(1 << LCD_RS); // RS=0
LCD_RW_PORT |= (1 << LCD_RW); // RW=1
@ -63,8 +65,22 @@ void loop_until_LCD_BF_clear(void) {
STATUS_LED_PORT |= 1 << STATUS_LED; // DEBUG
do {
clkLCD();
} while (bit_is_clear(LCD_DBUS7_PIN, LCD_BF));
bf = 0;
LCD_ENABLE_PORT |= (1 << LCD_ENABLE);
_delay_us(1); // 'delay data time' and 'enable pulse width'
bf |= (LCD_DBUS7_PIN & (1 << LCD_BF));
LCD_ENABLE_PORT &= ~(1 << LCD_ENABLE);
_delay_us(1); // 'address hold time', 'data hold time' and 'enable cycle width'
#ifdef FOUR_BIT_MODE
LCD_ENABLE_PORT |= (1 << LCD_ENABLE);
_delay_us(1); // 'delay data time' and 'enable pulse width'
LCD_ENABLE_PORT &= ~(1 << LCD_ENABLE);
_delay_us(1); // 'address hold time', 'data hold time' and 'enable cycle width'
#endif
} while (bf);
STATUS_LED_PORT &= ~(1 << STATUS_LED); // DEBUG
#if defined (FOUR_BIT_MODE) || defined (EIGHT_BIT_ARBITRARY_PIN_MODE)
@ -207,7 +223,6 @@ void writeStringToLCD(const char* str) {
void clearDisplay(void) {
writeLCDInstr(CMD_CLEAR_DISPLAY);
_delay_us(LCD_CLEAR_DISPLAY_DELAY);
// Reset line and char number tracking
currentLineNum = 0;
@ -216,7 +231,6 @@ void clearDisplay(void) {
void returnHome(void) {
writeLCDInstr(CMD_RETURN_HOME);
_delay_us(LCD_RETURN_HOME_DELAY);
// Reset line and char number tracking
currentLineNum = 0;

2
lcdLibConfig.h
View File

@ -59,7 +59,7 @@
//#define EIGHT_BIT_ARBITRARY_PIN_MODE
// LCD in 4-bit mode (on arbitrary pins)
//#define FOUR_BIT_MODE
#define FOUR_BIT_MODE
/* All mode options */