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