universal_drivers/hd44780u_driver
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works now and is tested.. but needs cleanup!!

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This commit is contained in:
Christian Karl Oscar Lind Vie Madsen
2025-06-18 16:15:19 +02:00
parent b1559460ee
commit a9b4431d67
2 changed files with 68 additions and 3 deletions
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65
lcd_hd44780.c
View File

@@ -72,14 +72,12 @@ static int lcd_write_8bit(cm_lcd_hd44780_t *inst, uint8_t dataOrCmd, hd44780_Ins
// Then Clock data in with E pin. Data is clocked on Falling edge:
inst->gpio_data.e_pin = 0;
inst->setGetGpio_event(&(inst->gpio_data),LCD_HD44780_SET);
// Wait until display is ready:
WaitUntilReady(inst);
// Then set E pin high so its ready for next time:
inst->gpio_data.e_pin = 1;
inst->setGetGpio_event(&(inst->gpio_data),LCD_HD44780_SET);
return 0;
}
@@ -101,15 +99,74 @@ static void lcd_writeCmd_disp(cm_lcd_hd44780_t *inst, hd44780_cmd_t cmd, hd44780
}
void lcd_hd44780_printChar(cm_lcd_hd44780_t *inst, char character) {
if (inst->bit_mode == LCD_HD44780_BITMODE_8BIT) {
lcd_write_8bit(inst, character, LCD_HD44780_DATA);
} else {
// Write MSB first
lcd_write_8bit(inst, ((character >> 4) & 0x0F) << 4, LCD_HD44780_DATA);
// Then LSB
lcd_write_8bit(inst, (character & 0x0F) << 4, LCD_HD44780_DATA);
}
}
void lcd_hd44780_printf(cm_lcd_hd44780_t *inst, char *string) {
while (*string) {
lcd_hd44780_printChar(inst, *string++);
}
}
void lcd_hd44780_print_xy(cm_lcd_hd44780_t *inst, uint8_t x, uint8_t y, const char *str) {
// Base DDRAM addresses for each row (for 2-line display)
const uint8_t row_offsets[] = {0x00, 0x40, 0x14, 0x54}; // for 4-line displays
if (y > 3) return; // Prevent invalid row access
// Set DDRAM address command: 0x80 | (offset + x)
lcd_writeCmd_disp(inst, 0x80 | (row_offsets[y] + x), LCD_HD44780_SET);
// Write characters
while (*str) {
lcd_hd44780_printChar(inst, *str++);
}
}
void lcd_hd44780_cursorHome(cm_lcd_hd44780_t *inst) {
lcd_writeCmd_disp(inst, LCD_HD44780_RETURN_HOME, LCD_HD44780_SET);
}
void lcd_hd44780_clearDisp(cm_lcd_hd44780_t *inst) {
lcd_writeCmd_disp(inst, LCD_HD44780_CLEAR_DISP, LCD_HD44780_SET);
// Wait for the command to finish.
// This is a long operation (? 1.53 ms), so if not polling BF, delay at least 2 ms.
if (!inst->isInit) {
inst->wait_event(2);
} else {
WaitUntilReady(inst);
}
}
void lcd_hd44780_initDisp(cm_lcd_hd44780_t *inst){
// Make sure E pin is high when data isnt ready on BUS!
inst->gpio_data.e_pin = 1;
inst->setGetGpio_event(&(inst->gpio_data),LCD_HD44780_SET);
inst->wait_event(1);
// Wait for more than 15ms after VCC rise..
inst->wait_event(15);
lcd_writeCmd_disp(inst, LCD_HD44780_FUNCTION_SET,LCD_HD44780_SET);
// Init display to 4 bit mode if selected!
if(inst->bit_mode == LCD_HD44780_BITMODE_4BIT){
lcd_write_8bit(inst, 0x20, LCD_HD44780_INSTRUCTION);
inst->wait_event(1); // Small delay
}
// Wait for 4.1ms..
// Delay(4)
@@ -123,7 +180,7 @@ void lcd_hd44780_initDisp(cm_lcd_hd44780_t *inst){
lcd_writeCmd_disp(inst, LCD_HD44780_ENTRY_MODE,LCD_HD44780_SET);
// Init has been done, and we can now use Busy Flag polling instead of delay!
inst->isInit = 0x1;
//inst->isInit = 0x1;
}
@@ -150,6 +207,8 @@ void lcd_hd44780_init(cm_lcd_hd44780_t *inst, lcd_hd44780_bitmode bit_mode){
inst->bit_mode = bit_mode;
lcd_hd44780_initDisp(inst);
lcd_hd44780_clearDisp(inst);
return;
}

6
lcd_hd44780.h
View File

@@ -23,9 +23,11 @@ typedef enum {
LCD_HD44780_RETURN_HOME = 0x2,
LCD_HD44780_ENTRY_MODE = 0x6,
LCD_HD44780_DISP_ONOFF_CTL = 0xE,
LCD_HD44780_DISPLAY_ON_CURSOR_ON_BLINK_ON = 0x0F,
LCD_HD44780_CURSOR_SHIFT = 0x6,
LCD_HD44780_FUNCTION_SET = 0x30,
}hd44780_cmd_t;
typedef enum{
@@ -86,5 +88,9 @@ typedef struct{
void lcd_hd44780_init(cm_lcd_hd44780_t *inst,lcd_hd44780_bitmode bit_mode);
void lcd_hd44780_regGpioEvt(cm_lcd_hd44780_t *inst, setGet_Gpio_Event_fpt getGpioEvt_fpt);
void lcd_hd44780_regWaitEvt(cm_lcd_hd44780_t *inst, wait_ms_Event_fpt waitEvt_fpt);
void lcd_hd44780_cursorHome(cm_lcd_hd44780_t *inst);
void lcd_hd44780_printf(cm_lcd_hd44780_t *inst, char *string);
void lcd_hd44780_clearDisp(cm_lcd_hd44780_t *inst);
void lcd_hd44780_print_xy(cm_lcd_hd44780_t *inst, uint8_t x, uint8_t y, const char *str);
#endif /*LCD_HD44780_H_*/