FEATURE: Simple but almost full featured HD4478U LCD Driver over I2C with PCF8574A
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@ -49,7 +49,7 @@ else ()
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add_compile_options(-Og -g)
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endif ()
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include_directories(USB_DEVICE/App USB_DEVICE/Target Core/Inc Drivers/STM32F4xx_HAL_Driver/Inc Drivers/STM32F4xx_HAL_Driver/Inc/Legacy Middlewares/ST/STM32_USB_Device_Library/Core/Inc Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc Drivers/CMSIS/Device/ST/STM32F4xx/Include Drivers/CMSIS/Include)
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include_directories(USB_DEVICE/App USB_DEVICE/Target Core/Inc Drivers/STM32F4xx_HAL_Driver/Inc Drivers/STM32F4xx_HAL_Driver/Inc/Legacy Middlewares/ST/STM32_USB_Device_Library/Core/Inc Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc Drivers/CMSIS/Device/ST/STM32F4xx/Include Drivers/CMSIS/Include Middlewares/floatpump/Inc)
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add_definitions(-DDEBUG -DUSE_HAL_DRIVER -DSTM32F411xE)
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51
Middlewares/floatpump/Inc/LCD_I2C_Driver.h
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51
Middlewares/floatpump/Inc/LCD_I2C_Driver.h
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@ -0,0 +1,51 @@
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//
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// Created by robtor on 09.12.22.
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//
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#ifndef FLOATPUMP_LCD_I2C_DRIVER_H
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#define FLOATPUMP_LCD_I2C_DRIVER_H
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#include "stm32f4xx_hal.h"
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namespace floatpump{
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class LCD_I2C_Driver {
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public:
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LCD_I2C_Driver(I2C_HandleTypeDef &handle, uint16_t displayAddr, uint8_t rows = 4, uint8_t cols = 20)
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: m_handle(handle), m_displayAddr(displayAddr), m_rows(rows), m_cols(cols) {};
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void LCDSendCString(char *str);
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void LCDInitialize(void);
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void LCDClearDisplay(void);
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void LCDSetBacklight(bool enabled);
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void LCDPower(bool enabled);
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void LCDCursor(bool enabled);
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void LCDCursorBlink(bool enabled);
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void LCDCursorIncDec(bool enabled);
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void LCDDisplayShift(bool enabled);
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void LCDSetCursor(uint8_t x, uint8_t y);
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private:
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I2C_HandleTypeDef m_handle;
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uint16_t m_displayAddr;
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bool m_backlight{};
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bool m_cursor{};
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bool m_cursorBlink{};
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bool m_incrementDecrement{};
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bool m_autoShift{};
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bool m_powered;
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uint8_t m_rows;
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uint8_t m_cols;
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void m_lcdSendData(char data);
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void m_lcdSendCmnd(char cmnd);
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};
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} // floatpump
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#endif //FLOATPUMP_LCD_I2C_DRIVER_H
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149
Middlewares/floatpump/Src/LCD_I2C_Driver.cpp
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Middlewares/floatpump/Src/LCD_I2C_Driver.cpp
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@ -0,0 +1,149 @@
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//
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// Created by robtor on 09.12.22.
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//
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#include "../Inc/LCD_I2C_Driver.h"
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namespace floatpump {
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void LCD_I2C_Driver::m_lcdSendCmnd(char cmnd) {
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char data_u, data_l; //upper and lower nibble to transmit
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char backlight = (m_backlight << 3);
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uint8_t data_t[4]; //data to transmit
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data_u = (cmnd & 0xf0); //get higher nibble
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data_l = ((cmnd << 4) & 0xf0); //get lower nibble
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data_t[0] = backlight | data_u | 0x04; //EN=1, RS=0 (XXXX 1100)
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data_t[1] = backlight | data_u | 0x00; //EN=0, RS=0 (XXXX 1000)
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data_t[2] = backlight | data_l | 0x04; //EN=1, RS=0
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data_t[3] = backlight | data_l | 0x00; //EN=0, RS=0
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HAL_I2C_Master_Transmit(&m_handle, m_displayAddr, (uint8_t *) data_t, 4, 100);
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}
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void LCD_I2C_Driver::m_lcdSendData(char data) {
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char data_u, data_l; //upper and lower nibble of data
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char backlight = (m_backlight << 3);
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uint8_t data_t[4]; //data to transmit
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data_u = (data & 0xf0); //get higher nibble
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data_l = ((data << 4) & 0xf0); //get lower nibble
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data_t[0] = backlight | data_u | 0x05; //EN=1, RS=1 (XXXX 1101)
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data_t[1] = backlight | data_u | 0x01; //EN=0, RS=1 (XXXX 1001)
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data_t[2] = backlight | data_l | 0x05; //EN=1, RS=1
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data_t[3] = backlight | data_l | 0x01; //EN=0, RS=1
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HAL_I2C_Master_Transmit(&m_handle, m_displayAddr, (uint8_t *) data_t, 4, 100);
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}
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void LCD_I2C_Driver::LCDInitialize() {
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// Initialization by Instruction (from HD44780U Datasheet)
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HAL_Delay(50); // wait for >40ms
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m_lcdSendCmnd(0x30);
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HAL_Delay(5); // wait for >4.1ms
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m_lcdSendCmnd (0x30);
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HAL_Delay(1); // wait for >100us
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m_lcdSendCmnd (0x30);
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HAL_Delay(10); // Wait for command execution lengt
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// Configuration
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m_lcdSendCmnd (0x20); // Set Interface to 4-bit mode
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HAL_Delay(10);
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m_lcdSendCmnd (0x28); // Function set 00001 DL N F - - => DL=0 (4 bit mode), N = 1 (2 line display) F = 0 (5x8 characters)
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HAL_Delay(1);
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m_lcdSendCmnd (0x08); // Display on/off control 00001 D C B => D=0 Display on/off, C=0 Cursor on/off, B=0 Cursor blink on/off
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HAL_Delay(1);
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m_lcdSendCmnd (0x01); // clear display 00000001
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HAL_Delay(1);
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HAL_Delay(1);
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m_lcdSendCmnd (0x06); //Entry mode set 000001 I/D S => I/D = 1 increment cursor, S = 0 display shift
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HAL_Delay(1);
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m_lcdSendCmnd (0x0C); // Display on/off control 00001 D C B => D=1 Display on/off, C=0 Cursor on/off, B=0 Cursor blink on/off
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HAL_Delay(1);
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m_powered = true;
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m_cursor = false;
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m_cursorBlink = false;
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m_incrementDecrement = true;
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m_autoShift = false;
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}
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void LCD_I2C_Driver::LCDSendCString(char *str) {
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while (*str) m_lcdSendData(*str++);
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}
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void LCD_I2C_Driver::LCDClearDisplay(void) {
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m_lcdSendCmnd (0x01);
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HAL_Delay(1);
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}
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void LCD_I2C_Driver::LCDSetBacklight(bool enabled) {
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m_backlight = enabled;
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//Send dummy command to force backlight set
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uint8_t dummyPacket = (enabled << 3);
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HAL_I2C_Master_Transmit(&m_handle, m_displayAddr, &dummyPacket, 1, 100);
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}
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void LCD_I2C_Driver::LCDPower(bool enabled) {
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char com_build = 0x08 | (enabled << 2) | (m_cursor << 1) | (m_cursorBlink);
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m_lcdSendCmnd (com_build); // Display on/off control 00001 D C B => D=0 Display on/off, C=0 Cursor on/off, B=0 Cursor blink on/off
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m_powered = enabled;
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}
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void LCD_I2C_Driver::LCDCursor(bool enabled) {
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char com_build = 0x08 | (m_powered << 2) | (enabled << 1) | (m_cursorBlink);
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m_lcdSendCmnd (com_build); // Display on/off control 00001 D C B => D=0 Display on/off, C=0 Cursor on/off, B=0 Cursor blink on/off
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m_cursor = enabled;
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}
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void LCD_I2C_Driver::LCDCursorBlink(bool enabled) {
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char com_build = 0x08 | (m_powered << 2) | (m_cursor << 1) | (enabled);
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m_lcdSendCmnd (com_build); // Display on/off control 00001 D C B => D=0 Display on/off, C=0 Cursor on/off, B=0 Cursor blink on/off
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m_cursorBlink = enabled;
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}
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void LCD_I2C_Driver::LCDCursorIncDec(bool enabled) {
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char com_build = 0x04 | (enabled << 1) | m_autoShift;
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m_lcdSendCmnd(com_build);
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m_incrementDecrement = enabled;
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}
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void LCD_I2C_Driver::LCDDisplayShift(bool enabled) {
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char com_build = 0x04 | (m_incrementDecrement << 1) | enabled;
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m_lcdSendCmnd(com_build);
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m_autoShift = enabled;
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}
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void LCD_I2C_Driver::LCDSetCursor(uint8_t x, uint8_t y) {
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char addr = 0x00;
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char startat = 0x00;
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// Generate start addresses for each row
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// Remember that Controller assumes only two lines of ram, line 2 starting at 0x40
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// |0x00 -------------- line 1 -------------- 0x13||0x14 -------------- line 3 -------------- 0x27|
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// |0x40 -------------- line 2 -------------- 0x53||0x54 -------------- line 4 -------------- 0x67|
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switch(y) {
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case 0: startat = 0x00; break;
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case 1: startat = 0x40; break;
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case 2: startat = 0x14; break;
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case 3: startat = 0x54; break;
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}
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addr = startat + x;
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m_lcdSendCmnd(( 0x80 | addr));
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HAL_Delay(1);
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}
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} // floatpump
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