lcd lib included

Core/Inc/lcd.h

@@ -0,0 +1,20 @@
+#ifndef __I2C_LCD_H
+#define __I2C_LCD_H
+
+#include "stm32f1xx_hal.h"
+
+typedef struct
+{
+    I2C_HandleTypeDef   *I2C_Handle; //I2C handle parameters
+    uint8_t             address;
+    uint8_t             rows;
+    uint8_t             cols;
+} LCD_HandleTypeDef;
+
+HAL_StatusTypeDef LCD_SendInternal(LCD_HandleTypeDef *lcd, uint8_t data, uint8_t flags);
+void LCD_SendCommand(LCD_HandleTypeDef *lcd, uint8_t cmd);
+void LCD_SendData(LCD_HandleTypeDef *lcd, uint8_t data);
+void LCD_Init(LCD_HandleTypeDef *lcd);
+void LCD_SendString(LCD_HandleTypeDef *lcd,  char *str);
+
+#endif

Core/Src/lcd.c

@@ -0,0 +1,107 @@
+#include "lcd.h"
+
+#define LCD_COLS 20
+
+#define LCD_DELAY_MS 5
+
+// commands
+#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
+
+// flags for display entry mode
+#define LCD_ENTRYRIGHT 0x00
+#define LCD_ENTRYLEFT 0x02
+#define LCD_ENTRYSHIFTINCREMENT 0x01
+#define LCD_ENTRYSHIFTDECREMENT 0x00
+
+// flags for display on/off control
+#define LCD_DISPLAYON 0x04
+#define LCD_DISPLAYOFF 0x00
+#define LCD_CURSORON 0x02
+#define LCD_CURSOROFF 0x00
+#define LCD_BLINKON 0x01
+#define LCD_BLINKOFF 0x00
+
+// flags for display/cursor shift
+#define LCD_DISPLAYMOVE 0x08
+#define LCD_CURSORMOVE 0x00
+#define LCD_MOVERIGHT 0x04
+#define LCD_MOVELEFT 0x00
+
+// flags for function set
+#define LCD_8BITMODE 0x10
+#define LCD_4BITMODE 0x00
+#define LCD_MULTILINE 0x08
+#define LCD_SINGLELINE 0x00
+#define LCD_5x10DOTS 0x04
+#define LCD_5x8DOTS 0x00
+
+// flags for backlight control
+#define LCD_BACKLIGHT 0x08
+#define LCD_NOBACKLIGHT 0x00
+
+//moving 
+#define LCD_LINE1 0x00
+#define LCD_LINE2 0x40
+#define LCD_LINE3 0x14
+#define LCD_LINE4 0x54
+
+#define LCD_PIN_EN 0b00000100  // Enable bit
+#define LCD_PIN_RW 0b00000010  // Read/Write bit
+#define LCD_PIN_RS 0b00000001  // Register select bit
+
+HAL_StatusTypeDef LCD_SendInternal(LCD_HandleTypeDef *lcd, uint8_t data, uint8_t flags) {
+    HAL_StatusTypeDef res;
+    for(;;) {
+        res = HAL_I2C_IsDeviceReady(lcd->I2C_Handle, lcd->address, 1, HAL_MAX_DELAY);
+        if(res == HAL_OK)
+            break;
+    }
+
+    uint8_t up = data & 0xF0;
+    uint8_t lo = (data << 4) & 0xF0;
+
+    uint8_t data_arr[4];
+    data_arr[0] = up|flags|LCD_BACKLIGHT|LCD_PIN_EN;
+    data_arr[1] = up|flags|LCD_BACKLIGHT;
+    data_arr[2] = lo|flags|LCD_BACKLIGHT|LCD_PIN_EN;
+    data_arr[3] = lo|flags|LCD_BACKLIGHT;
+
+    res = HAL_I2C_Master_Transmit(lcd->I2C_Handle, lcd->address, data_arr,
+                                  sizeof(data_arr), HAL_MAX_DELAY);
+    HAL_Delay(LCD_DELAY_MS);
+    return res;
+}
+
+void LCD_SendCommand(LCD_HandleTypeDef *lcd, uint8_t cmd) {
+    LCD_SendInternal(lcd->address, cmd, 0);
+}
+
+void LCD_SendData(LCD_HandleTypeDef *lcd, uint8_t data) {
+    LCD_SendInternal(lcd->address, data, LCD_PIN_RS);
+}
+
+void LCD_Init(LCD_HandleTypeDef *lcd) {
+    //http://easyelectronics.ru/avr-uchebnyj-kurs-podklyuchenie-k-avr-lcd-displeya-hd44780.html
+
+    LCD_SendCommand(lcd->address, LCD_FUNCTIONSET | LCD_4BITMODE | LCD_MULTILINE | LCD_5x8DOTS); // 0b00110000);
+    // display & cursor home (keep this!)
+    LCD_SendCommand(lcd->address, LCD_RETURNHOME);
+    // display on, right shift, underline off, blink off
+    LCD_SendCommand(lcd->address, LCD_DISPLAYCONTROL|LCD_DISPLAYON|LCD_CURSOROFF|LCD_BLINKOFF); // 0b00001100);
+    // clear display (optional here)
+    LCD_SendCommand(lcd->address, LCD_CLEARDISPLAY);
+}
+
+void LCD_SendString(LCD_HandleTypeDef *lcd,  char *str) {
+    while(*str) {
+        LCD_SendData(lcd->address, (uint8_t)(*str));
+        str++;
+    }
+}

Core/Src/main.c

@@ -24,6 +24,7 @@
 
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
+#include "lcd.h"
 
 /* USER CODE END Includes */
 
@@ -53,6 +54,12 @@ UART_HandleTypeDef huart1;
 DMA_HandleTypeDef hdma_usart1_tx;
 
 /* USER CODE BEGIN PV */
+LCD_HandleTypeDef hlcd = { 
+    &hi2c1,
+    (0x27 << 1),
+    4,
+    20
+};
 
 /* USER CODE END PV */
 
@@ -109,7 +116,7 @@ int main(void)
   MX_USART1_UART_Init();
   MX_USB_DEVICE_Init();
   /* USER CODE BEGIN 2 */
-
+  LCD_Init(&hlcd);
   /* USER CODE END 2 */
 
   /* Infinite loop */

Makefile

@@ -22,7 +22,7 @@ TARGET = Uberdevice
 # debug build?
 DEBUG = 1
 # optimization
-OPT = -Og -Os
+OPT = -Og 
 
 
 #######################################
@@ -37,6 +37,7 @@ BUILD_DIR = build
 # C sources
 C_SOURCES =  \
 Core/Src/main.c \
+Core/Src/lcd.c \
 Core/Src/stm32f1xx_it.c \
 Core/Src/stm32f1xx_hal_msp.c \
 USB_DEVICE/App/usb_device.c \