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avr-lcd-lib
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Finished (but untested) modes 

1. Default mode (8-bit data bus, control lines on any PINs)
2. 8-bit arbitrary pin mode (8-bit data bus on any PIN, control lines on
   any PINs)
3. 4-bit mode (4-bit data bus, control lines on any PINs)

Default mode is tested and working. The others still require testing.

Signed-off-by: Collin J. Doering <collin.doering@rekahsoft.ca>
This commit is contained in:
Collin J. Doering 2015-10-01 03:43:07 -04:00
parent 5777e2b831
commit fc0de88b8e
1 changed files with 35 additions and 21 deletions
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56
lcdLib.c
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@ -51,7 +51,7 @@ void loop_until_LCD_BF_clear(void) {
LCD_RW_PORT |= (1 << LCD_RW); // RW=1 LCD_RW_PORT |= (1 << LCD_RW); // RW=1
// Set LCD_BF as input // Set LCD_BF as input
#ifdef FOUR_BIT_MODE #if defined (FOUR_BIT_MODE) || defined (EIGHT_BIT_ARBITRARY_PIN_MODE)
LCD_DBUS7_PORT &= ~(1 << LCD_BF); LCD_DBUS7_PORT &= ~(1 << LCD_BF);
#else #else
LCD_DBUS_DDR &= ~(1 << LCD_BF); LCD_DBUS_DDR &= ~(1 << LCD_BF);
@ -61,18 +61,24 @@ void loop_until_LCD_BF_clear(void) {
do { do {
clkLCD(); clkLCD();
} }
#ifdef FOUR_BIT_MODE #if defined (FOUR_BIT_MODE) || defined (EIGHT_BIT_ARBITRARY_PIN_MODE)
while (bit_is_clear(LCD_DBUS7_PIN, LCD_BF)); while (bit_is_clear(LCD_DBUS7_PIN, LCD_BF));
#else #else
while (bit_is_clear(LCD_DBUS_PIN, LCD_BF)); while (bit_is_clear(LCD_DBUS_PIN, LCD_BF));
#endif #endif
STATUS_LED_PORT &= ~(1 << STATUS_LED); // DEBUG STATUS_LED_PORT &= ~(1 << STATUS_LED); // DEBUG
#ifdef FOUR_BIT_MODE #if defined (FOUR_BIT_MODE) || defined (EIGHT_BIT_ARBITRARY_PIN_MODE)
LCD_DBUS7_DDR = 0; LCD_DBUS7_DDR &= ~(1 << LCD_DBUS7);
LCD_DBUS6_DDR = 0; LCD_DBUS6_DDR &= ~(1 << LCD_DBUS6);
LCD_DBUS5_DDR = 0; LCD_DBUS5_DDR &= ~(1 << LCD_DBUS5);
LCD_DBUS4_DDR = 0; LCD_DBUS4_DDR &= ~(1 << LCD_DBUS4);
#ifdef EIGHT_BIT_ARBITRARY_PIN_MODE
LCD_DBUS3_DDR &= ~(1 << LCD_DBUS3);
LCD_DBUS2_DDR &= ~(1 << LCD_DBUS2);
LCD_DBUS1_DDR &= ~(1 << LCD_DBUS1);
LCD_DBUS0_DDR &= ~(1 << LCD_DBUS0);
#endif
#else #else
LCD_DBUS_DDR = 0xff; // Reset all LCD_DBUS_PORT pins as outputs LCD_DBUS_DDR = 0xff; // Reset all LCD_DBUS_PORT pins as outputs
#endif #endif
@ -105,8 +111,24 @@ void writeLCDNibble_(uint8_t b) {
Write a byte to the LCD data bus. Does not touch the RS or RW control lines. Write a byte to the LCD data bus. Does not touch the RS or RW control lines.
*/ */
void writeLCDByte_(uint8_t b) { void writeLCDByte_(uint8_t b) {
#ifdef FOUR_BIT_MODE
writeLCDNibble_(b);
writeLCDNibble_(b << 4);
#elif defined (EIGHT_BIT_ARBITRARY_PIN_MODE)
LCD_DBUS7_PORT |= (1 << LCD_DBUS7);
LCD_DBUS6_PORT |= (1 << LCD_DBUS6);
LCD_DBUS5_PORT |= (1 << LCD_DBUS5);
LCD_DBUS4_PORT |= (1 << LCD_DBUS4);
LCD_DBUS3_PORT |= (1 << LCD_DBUS3);
LCD_DBUS2_PORT |= (1 << LCD_DBUS2);
LCD_DBUS1_PORT |= (1 << LCD_DBUS1);
LCD_DBUS0_PORT |= (1 << LCD_DBUS0);
clkLCD();
#else
LCD_DBUS_PORT = b; LCD_DBUS_PORT = b;
clkLCD(); clkLCD();
#endif
} }
void writeLCDInstr_(uint8_t instr) { void writeLCDInstr_(uint8_t instr) {
@ -117,8 +139,7 @@ LCD_RW_PORT &= ~(1 << LCD_RW); // RW=0
writeLCDNibble_(instr); writeLCDNibble_(instr);
writeLCDNibble_(instr << 4); writeLCDNibble_(instr << 4);
#else #else
LCD_DBUS_PORT = instr; writeLCDByte_(instr);
clkLCD();
#endif #endif
} }
@ -222,8 +243,7 @@ static inline void softwareLCDInitPulse(void) {
#ifdef FOUR_BIT_MODE #ifdef FOUR_BIT_MODE
writeLCDNibble_(CMD_INIT); writeLCDNibble_(CMD_INIT);
#else #else
LCD_DBUS_PORT = CMD_INIT; writeLCDByte_(CMD_INIT);
clkLCD();
#endif #endif
} }
@ -275,15 +295,9 @@ void initLCD (void) {
void initLCDByInternalReset(void) { void initLCDByInternalReset(void) {
enableLCDOutput(); enableLCDOutput();
writeLCDInstr_(0x38); writeLCDInstr_(INSTR_FUNC_SET | (1 << INSTR_FUNC_SET_DL) | (1 << INSTR_FUNC_SET_N));
writeLCDInstr_(0x0F); writeLCDInstr_(0x0F);
writeLCDInstr_(0x06); writeLCDInstr_(0x06);
writeLCDInstr_(0x01); writeLCDInstr_(CMD_CLEAR_DISPLAY);
_delay_ms(16); _delay_ms(LCD_CLEAR_DISPLAY_DELAY);
/* writeLCDInstr_(0x01); // Clear display */
/* writeLCDInstr_(0x30); // RS=RW=0, 0b00110000 */
/* writeLCDInstr_(0x08); // Display off, cursor off, blink off */
/* writeLCDInstr_(0x06); // Increment mode, no shift */
/* writeLCDInstr_(0x0E); // Display on, cursor on, blink off */
} }