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rusefi/firmware/hw_layer/lcd/lcd_HD44780.cpp

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/**
* @file lcd_HD44780.cpp
* @brief HD44780 character display driver
*
* see http://en.wikipedia.org/wiki/Hitachi_HD44780_LCD_controller
* @date 13.12.2013
* @author Andrey Belomutskiy, (c) 2012-2020
*/
#include "global.h"
#if EFI_HD44780_LCD
#include "lcd_HD44780.h"
#include "pin_repository.h"
#include "string.h"
#include "engine.h"
EXTERN_ENGINE;
static Logging *logger;
enum {
LCD_HD44780_DISPLAY_CLEAR = 0x01,
LCD_HD44780_SHIFT_CURSOR_RIGHT = 0x06,
LCD_HD44780_DISPLAY_ON = 0x0C,
LCD_HD44780_4_BIT_BUS = 0x20,
LCD_HD44780_RESET = 0x30,
LCD_HD44780_DDRAM_ADDR = 0x80,
// LCD_2X16_8_BIT_BUS = 0x30,
// LCD_2X16_LINE_ONE = 0x20,
// LCD_2X16_LINES_TWO = 0x28,
// LCD_2X16_FONT_5X8 = 0x20,
// LCD_2X16_FONT_5X10 = 0x24,
// LCD_2X16_DISPLAY_HOME = 0x02,
// LCD_2X16_DISPLAY_RIGHT = 0x1C,
// LCD_2X16_DISPLAY_LEFT = 0x18,
// LCD_2X16_DISPLAY_SHIFT = 0x05,
// LCD_2X16_CURSOR_ON = 0x0A,
// LCD_2X16_CURSOR_BLINK = 0x09,
// LCD_2X16_CURSOR_RIGHT = 0x14,
// LCD_2X16_CURSOR_LEFT = 0x10,
// LCD_2X16_SHIFT_LEFT = 0x04,
// LCD_2X16_CGRAM_ADDR = 0x40,
// LCD_2X16_BUSY_FLAG = 0x80,
// LCD_2X16_COMMAND = 0x01,
// LCD_2X16_DATA = 0x00,
} /*lcd_HD44780_command*/;
// http://web.alfredstate.edu/weimandn/lcd/lcd_addressing/lcd_addressing_index.html
static const int lineStart[] = { 0, 0x40, 0x14, 0x54 };
static int BUSY_WAIT_DELAY = FALSE;
static int currentRow = 0;
static int currentColumn = 0;
static void lcdSleep(int period) {
if (BUSY_WAIT_DELAY) {
// this mode is useful for displaying messages to report OS fatal issues
int ticks = CORE_CLOCK / 1000000 * period;
int a = 0;
for (int i = 0; i < ticks; i++)
a += i;
// the purpose of this code is to fool the compiler so that the loop is not optimized away
efiAssertVoid(CUSTOM_ERR_6656, a != 0, "true");
} else {
chThdSleepMicroseconds(period);
}
}
//static char txbuf[1];
#define LCD_PORT_EXP_ADDR 0x20
// todo: use this method wider!
static void writePad(const char *msg, brain_pin_e pin, int bit) {
palWritePad(getHwPort(msg, pin), getHwPin(msg, pin), bit);
}
static bool lcd_HD44780_is_enabled(void) {
/* check for valid LCD setting */
return ((engineConfiguration->displayMode == DM_HD44780) &&
(isBrainPinValid(CONFIG(HD44780_rs))) &&
(isBrainPinValid(CONFIG(HD44780_e))) &&
(isBrainPinValid(CONFIG(HD44780_db4))) &&
(isBrainPinValid(CONFIG(HD44780_db5))) &&
(isBrainPinValid(CONFIG(HD44780_db6))) &&
(isBrainPinValid(CONFIG(HD44780_db7))));
}
//-----------------------------------------------------------------------------
static void lcd_HD44780_write(uint8_t data) {
if (engineConfiguration->displayMode == DM_HD44780) {
writePad("lcd", CONFIG(HD44780_db7),
data & 0x80 ? 1 : 0);
writePad("lcd", CONFIG(HD44780_db6),
data & 0x40 ? 1 : 0);
writePad("lcd", CONFIG(HD44780_db5),
data & 0x20 ? 1 : 0);
writePad("lcd", CONFIG(HD44780_db4),
data & 0x10 ? 1 : 0);
writePad("lcd", CONFIG(HD44780_e), 1); // En high
lcdSleep(10); // enable pulse must be >450ns
writePad("lcd", CONFIG(HD44780_e), 0); // En low
lcdSleep(40); // commands need > 37us to settle
} else {
// LCD D4_pin -> P4
// LCD D5_pin -> P5
// LCD D6_pin -> P6
// LCD D7_pin -> P7
// LCD Pin RS -> P0
// LCD Pin RW -> P1
// LCD Pin E -> P2
// todo: finish all this stuff
}
}
//-----------------------------------------------------------------------------
static void lcd_HD44780_write_command(uint8_t data) {
palClearPad(getHwPort("lcd", CONFIG(HD44780_rs)), getHwPin("lcd", CONFIG(HD44780_rs)));
lcd_HD44780_write(data);
lcd_HD44780_write(data << 4);
}
//-----------------------------------------------------------------------------
static void lcd_HD44780_write_data(uint8_t data) {
palSetPad(getHwPort("lcd", CONFIG(HD44780_rs)), getHwPin("lcd", CONFIG(HD44780_rs)));
lcd_HD44780_write(data);
lcd_HD44780_write(data << 4);
currentColumn++;
palClearPad(getHwPort("lcd", CONFIG(HD44780_rs)), getHwPin("lcd", CONFIG(HD44780_rs)));
}
//-----------------------------------------------------------------------------
void lcd_HD44780_set_position(uint8_t row, uint8_t column) {
if (!lcd_HD44780_is_enabled())
return;
efiAssertVoid(CUSTOM_ERR_6657, row <= engineConfiguration->HD44780height, "invalid row");
currentRow = row;
currentColumn = column;
lcd_HD44780_write_command(LCD_HD44780_DDRAM_ADDR + lineStart[row] + column);
}
int getCurrentHD44780row(void) {
if (!lcd_HD44780_is_enabled())
return 0;
return currentRow;
}
int getCurrentHD44780column(void) {
if (!lcd_HD44780_is_enabled())
return 0;
return currentColumn;
}
void lcd_HD44780_print_char(char data) {
if (!lcd_HD44780_is_enabled())
return;
if (data == '\n') {
lcd_HD44780_set_position(++currentRow, 0);
} else {
lcd_HD44780_write_data(data);
}
}
void lcd_HD44780_print_string(const char* string) {
if (!lcd_HD44780_is_enabled())
return;
while (*string != 0x00)
lcd_HD44780_print_char(*string++);
}
//getHwPin(CONFIG(HD44780_db7))
static void lcdInfo(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
scheduleMsg(logger, "HD44780 RS=%s", hwPortname(CONFIG(HD44780_rs)));
scheduleMsg(logger, "HD44780 E=%s", hwPortname(CONFIG(HD44780_e)));
scheduleMsg(logger, "HD44780 D4=%s", hwPortname(CONFIG(HD44780_db4)));
scheduleMsg(logger, "HD44780 D5=%s", hwPortname(CONFIG(HD44780_db5)));
scheduleMsg(logger, "HD44780 D6=%s", hwPortname(CONFIG(HD44780_db6)));
scheduleMsg(logger, "HD44780 D7=%s", hwPortname(CONFIG(HD44780_db7)));
}
void stopHD44780_pins() {
efiSetPadUnused(activeConfiguration.HD44780_rs);
efiSetPadUnused(activeConfiguration.HD44780_e);
efiSetPadUnused(activeConfiguration.HD44780_db4);
efiSetPadUnused(activeConfiguration.HD44780_db5);
efiSetPadUnused(activeConfiguration.HD44780_db6);
efiSetPadUnused(activeConfiguration.HD44780_db7);
}
void startHD44780_pins() {
if (lcd_HD44780_is_enabled()) {
// initialize hardware lines
efiSetPadMode("lcd RS", CONFIG(HD44780_rs), PAL_MODE_OUTPUT_PUSHPULL);
efiSetPadMode("lcd E", CONFIG(HD44780_e), PAL_MODE_OUTPUT_PUSHPULL);
efiSetPadMode("lcd DB4", CONFIG(HD44780_db4), PAL_MODE_OUTPUT_PUSHPULL);
efiSetPadMode("lcd DB5", CONFIG(HD44780_db5), PAL_MODE_OUTPUT_PUSHPULL);
efiSetPadMode("lcd DB6", CONFIG(HD44780_db6), PAL_MODE_OUTPUT_PUSHPULL);
efiSetPadMode("lcd DB7", CONFIG(HD44780_db7), PAL_MODE_OUTPUT_PUSHPULL);
// and zero values
writePad("lcd", CONFIG(HD44780_rs), 0);
writePad("lcd", CONFIG(HD44780_e), 0);
writePad("lcd", CONFIG(HD44780_db4), 0);
writePad("lcd", CONFIG(HD44780_db5), 0);
writePad("lcd", CONFIG(HD44780_db6), 0);
writePad("lcd", CONFIG(HD44780_db7), 0);
}
}
void lcd_HD44780_init(Logging *sharedLogger) {
logger = sharedLogger;
addConsoleAction("lcdinfo", lcdInfo);
if (engineConfiguration->displayMode == DM_NONE) {
return;
}
if (engineConfiguration->displayMode > DM_HD44780_OVER_PCF8574) {
warning(CUSTOM_ERR_DISPLAY_MODE, "Unexpected displayMode %d", engineConfiguration->displayMode);
// I2C pins need initialization, code needs more work & testing
return;
}
printMsg(logger, "lcd_HD44780_init %d", engineConfiguration->displayMode);
if (!lcd_HD44780_is_enabled())
return;
chThdSleepMilliseconds(20); // LCD needs some time to wake up
lcd_HD44780_write(LCD_HD44780_RESET); // reset 1x
chThdSleepMilliseconds(1);
lcd_HD44780_write(LCD_HD44780_RESET); // reset 2x
lcd_HD44780_write(LCD_HD44780_RESET); // reset 3x
lcd_HD44780_write(LCD_HD44780_4_BIT_BUS); // 4 bit, 2 line
chThdSleepMicroseconds(40);
lcd_HD44780_write(LCD_HD44780_4_BIT_BUS); // 4 bit, 2 line
lcd_HD44780_write(0x80);
chThdSleepMicroseconds(40);
lcd_HD44780_write_command(0x08); // display and cursor control
chThdSleepMicroseconds(40);
lcd_HD44780_write_command(LCD_HD44780_DISPLAY_CLEAR);
chThdSleepMilliseconds(2);
lcd_HD44780_write_command(LCD_HD44780_SHIFT_CURSOR_RIGHT);
chThdSleepMilliseconds(2);
lcd_HD44780_write_command(LCD_HD44780_DISPLAY_ON);
lcd_HD44780_set_position(0, 0);
printMsg(logger, "lcd_HD44780_init() done");
}
void lcdShowPanicMessage(char *message) {
/* this is not a good idea to access config data
* when everything goes wrong... */
if (!lcd_HD44780_is_enabled())
return;
BUSY_WAIT_DELAY = TRUE;
lcd_HD44780_set_position(0, 0);
lcd_HD44780_print_string("PANIC\n");
lcd_HD44780_print_string(message);
}
#endif /* EFI_HD44780_LCD */
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