Add DMA and LiquidCrystal I2C support

- Implemented DMA functionality with a new dma.c and dma.h file.
- Added LiquidCrystal I2C driver with liquidcrystal_i2c.c and liquidcrystal_i2c.h files.
- Updated CMakeLists.txt to include dma.c and liquidcrystal_i2c.c in the build process.
- Modified build.ninja and compile_commands.json to reflect the new source files.
- Enhanced the main application to utilize the new DMA and LiquidCrystal I2C features.

Core/Inc/dma.h

@@ -0,0 +1,52 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file    dma.h
+  * @brief   This file contains all the function prototypes for
+  *          the dma.c file
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2025 STMicroelectronics.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __DMA_H__
+#define __DMA_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+
+/* DMA memory to memory transfer handles -------------------------------------*/
+
+/* USER CODE BEGIN Includes */
+
+/* USER CODE END Includes */
+
+/* USER CODE BEGIN Private defines */
+
+/* USER CODE END Private defines */
+
+void MX_DMA_Init(void);
+
+/* USER CODE BEGIN Prototypes */
+
+/* USER CODE END Prototypes */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __DMA_H__ */
+

Core/Inc/liquidcrystal_i2c.h

@@ -0,0 +1,88 @@
+#ifndef LIQUIDCRYSTAL_I2C_H_
+#define LIQUIDCRYSTAL_I2C_H_
+
+#include "stm32f1xx_hal.h"
+
+/* Command */
+#define LCD_CLEARDISPLAY 0x01
+#define LCD_RETURNHOME 0x02
+#define LCD_ENTRYMODESET 0x04
+#define LCD_DISPLAYCONTROL 0x08
+#define LCD_CURSORSHIFT 0x10
+#define LCD_FUNCTIONSET 0x20
+#define LCD_SETCGRAMADDR 0x40
+#define LCD_SETDDRAMADDR 0x80
+
+/* Entry Mode */
+#define LCD_ENTRYRIGHT 0x00
+#define LCD_ENTRYLEFT 0x02
+#define LCD_ENTRYSHIFTINCREMENT 0x01
+#define LCD_ENTRYSHIFTDECREMENT 0x00
+
+/* Display On/Off */
+#define LCD_DISPLAYON 0x04
+#define LCD_DISPLAYOFF 0x00
+#define LCD_CURSORON 0x02
+#define LCD_CURSOROFF 0x00
+#define LCD_BLINKON 0x01
+#define LCD_BLINKOFF 0x00
+
+/* Cursor Shift */
+#define LCD_DISPLAYMOVE 0x08
+#define LCD_CURSORMOVE 0x00
+#define LCD_MOVERIGHT 0x04
+#define LCD_MOVELEFT 0x00
+
+/* Function Set */
+#define LCD_8BITMODE 0x10
+#define LCD_4BITMODE 0x00
+#define LCD_2LINE 0x08
+#define LCD_1LINE 0x00
+#define LCD_5x10DOTS 0x04
+#define LCD_5x8DOTS 0x00
+
+/* Backlight */
+#define LCD_BACKLIGHT 0x08
+#define LCD_NOBACKLIGHT 0x00
+
+/* Enable Bit */
+#define ENABLE 0x04
+
+/* Read Write Bit */
+#define RW 0x0
+
+/* Register Select Bit */
+#define RS 0x01
+
+/* Device I2C Address */
+#define DEVICE_ADDR     (0x27 << 1)
+
+void HD44780_Init(uint8_t rows);
+void HD44780_Clear();
+void HD44780_Home();
+void HD44780_NoDisplay();
+void HD44780_Display();
+void HD44780_NoBlink();
+void HD44780_Blink();
+void HD44780_NoCursor();
+void HD44780_Cursor();
+void HD44780_ScrollDisplayLeft();
+void HD44780_ScrollDisplayRight();
+void HD44780_PrintLeft();
+void HD44780_PrintRight();
+void HD44780_LeftToRight();
+void HD44780_RightToLeft();
+void HD44780_ShiftIncrement();
+void HD44780_ShiftDecrement();
+void HD44780_NoBacklight();
+void HD44780_Backlight();
+void HD44780_AutoScroll();
+void HD44780_NoAutoScroll();
+void HD44780_CreateSpecialChar(uint8_t, uint8_t[]);
+void HD44780_PrintSpecialChar(uint8_t);
+void HD44780_SetCursor(uint8_t, uint8_t);
+void HD44780_SetBacklight(uint8_t new_val);
+void HD44780_LoadCustomCharacter(uint8_t char_num, uint8_t *rows);
+void HD44780_PrintStr(const char[]);
+
+#endif /* LIQUIDCRYSTAL_I2C_H_ */

Core/Inc/stm32f1xx_hal_conf.h

@@ -42,7 +42,7 @@
 /*#define HAL_CORTEX_MODULE_ENABLED   */
 /*#define HAL_CRC_MODULE_ENABLED   */
 /*#define HAL_DAC_MODULE_ENABLED   */
-/*#define HAL_DMA_MODULE_ENABLED   */
+#define HAL_DMA_MODULE_ENABLED
 /*#define HAL_ETH_MODULE_ENABLED   */
 /*#define HAL_FLASH_MODULE_ENABLED   */
 #define HAL_GPIO_MODULE_ENABLED

Core/Inc/stm32f1xx_it.h

@@ -55,7 +55,8 @@ void SVC_Handler(void);
 void DebugMon_Handler(void);
 void PendSV_Handler(void);
 void SysTick_Handler(void);
-void I2C1_EV_IRQHandler(void);
+void DMA1_Channel6_IRQHandler(void);
+void DMA1_Channel7_IRQHandler(void);
 void USART1_IRQHandler(void);
 void USART2_IRQHandler(void);
 /* USER CODE BEGIN EFP */