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136 lines
3.7 KiB
136 lines
3.7 KiB
#ifndef __LCD_H
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#define __LCD_H
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#include "lcd.h"
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#include "FreeRTOS.h"
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#include "task.h"
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#define LCD_COLS 20
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#define LCD_DELAY_MS 2
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// commands
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#define LCD_CLEARDISPLAY 0x01
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#define LCD_RETURNHOME 0x02
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#define LCD_ENTRYMODESET 0x04
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#define LCD_DISPLAYCONTROL 0x08
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#define LCD_CURSORSHIFT 0x10
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#define LCD_FUNCTIONSET 0x20
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#define LCD_SETCGRAMADDR 0x40
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#define LCD_SETDDRAMADDR 0x80
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// flags for display entry mode
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#define LCD_ENTRYRIGHT 0x00
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#define LCD_ENTRYLEFT 0x02
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#define LCD_ENTRYSHIFTINCREMENT 0x01
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#define LCD_ENTRYSHIFTDECREMENT 0x00
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// flags for display on/off control
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#define LCD_DISPLAYON 0x04
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#define LCD_DISPLAYOFF 0x00
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#define LCD_CURSORON 0x02
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#define LCD_CURSOROFF 0x00
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#define LCD_BLINKON 0x01
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#define LCD_BLINKOFF 0x00
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// flags for display/cursor shift
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#define LCD_DISPLAYMOVE 0x08
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#define LCD_CURSORMOVE 0x00
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#define LCD_MOVERIGHT 0x04
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#define LCD_MOVELEFT 0x00
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// flags for function set
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#define LCD_8BITMODE 0x10
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#define LCD_4BITMODE 0x00
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#define LCD_MULTILINE 0x08
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#define LCD_SINGLELINE 0x00
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#define LCD_5x10DOTS 0x04
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#define LCD_5x8DOTS 0x00
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// flags for backlight control
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#define LCD_BACKLIGHT 0x08
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#define LCD_NOBACKLIGHT 0x00
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//moving
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const uint8_t LINE_BEGIN[4] = {
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0x00,
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0x40,
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0x14,
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0x54
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};
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#define LCD_PIN_EN 0b00000100 // Enable bit
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#define LCD_PIN_RW 0b00000010 // Read/Write bit
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#define LCD_PIN_RS 0b00000001 // Register select bit
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HAL_StatusTypeDef LCD_SendInternal(LCD_HandleTypeDef *lcd, uint8_t data, uint8_t flags) {
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HAL_StatusTypeDef res;
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for(;;) {
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res = HAL_I2C_IsDeviceReady(lcd->I2C_Handle, lcd->address, 1, HAL_MAX_DELAY);
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if(res == HAL_OK)
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break;
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}
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uint8_t up = data & 0xF0;
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uint8_t lo = (data << 4) & 0xF0;
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uint8_t data_arr[4];
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data_arr[0] = up|flags|LCD_BACKLIGHT|LCD_PIN_EN;
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data_arr[1] = up|flags|LCD_BACKLIGHT;
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data_arr[2] = lo|flags|LCD_BACKLIGHT|LCD_PIN_EN;
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data_arr[3] = lo|flags|LCD_BACKLIGHT;
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res = HAL_I2C_Master_Transmit(lcd->I2C_Handle, lcd->address, data_arr,
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sizeof(data_arr), HAL_MAX_DELAY);
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vTaskDelay(LCD_DELAY_MS);
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return res;
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}
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void LCD_SendCommand(LCD_HandleTypeDef *lcd, uint8_t cmd) {
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LCD_SendInternal(lcd, cmd, 0);
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}
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void LCD_SendData(LCD_HandleTypeDef *lcd, uint8_t data) {
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LCD_SendInternal(lcd, data, LCD_PIN_RS);
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}
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void LCD_MoveCursor(LCD_HandleTypeDef *lcd, uint8_t line, uint8_t column) {
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if (line < lcd->rows && column < lcd->cols)
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LCD_SendCommand(lcd, LCD_SETDDRAMADDR | (LINE_BEGIN[line] + column) );
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}
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void LCD_Init(LCD_HandleTypeDef *lcd) {
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//http://easyelectronics.ru/avr-uchebnyj-kurs-podklyuchenie-k-avr-lcd-displeya-hd44780.html
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//http://nerdralph.blogspot.com/2014/07/controlling-hd44780-displays.html
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vTaskDelay(30);
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LCD_SendCommand(lcd, LCD_FUNCTIONSET | LCD_8BITMODE);
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vTaskDelay(1);
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LCD_SendCommand(lcd, LCD_FUNCTIONSET | LCD_8BITMODE);
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vTaskDelay(1);
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LCD_SendCommand(lcd, LCD_FUNCTIONSET | LCD_4BITMODE);
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vTaskDelay(1);
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LCD_SendCommand(lcd, LCD_FUNCTIONSET | LCD_4BITMODE | LCD_MULTILINE | LCD_5x8DOTS); // 0b00110000);
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vTaskDelay(5);
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// display & cursor home (keep this!)
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LCD_SendCommand(lcd, LCD_RETURNHOME);
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vTaskDelay(5);
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// display on, right shift, underline off, blink off
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LCD_SendCommand(lcd, LCD_DISPLAYCONTROL|LCD_DISPLAYON|LCD_CURSOROFF|LCD_BLINKOFF); // 0b00001100);
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vTaskDelay(5);
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// clear display (optional here)
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LCD_SendCommand(lcd, LCD_CLEARDISPLAY);
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vTaskDelay(5);
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}
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void LCD_SendChar(LCD_HandleTypeDef *lcd, char chr) {
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if (chr)
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LCD_SendData(lcd, (uint8_t)(chr));
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}
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void LCD_SendString(LCD_HandleTypeDef *lcd, char *str) {
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while(*str) {
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LCD_SendData(lcd, (uint8_t)(*str));
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str++;
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}
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}
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#endif |