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implement function to control LCD backlight #17

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implement function to control LCD backlight #17

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25 changes: 24 additions & 1 deletion Tutorial 42 - LCD16x2 I2C/lcd16x2_i2c.h
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,16 @@ void lcd16x2_i2c_cursorShow(bool state);
*/
void lcd16x2_i2c_clear(void);

/**
* @brief Turn ON/OFF LCD backlight
*/
void lcd16x2_i2c_backlight_control(uint8_t state);

/**
* @brief Toggle LCD backlight
*/
void lcd16x2_i2c_backlight_toggle(void);

/**
* @brief Display ON/OFF, to hide all characters, but not cl/*
* lcd16x2_i2c.c
Expand Down Expand Up @@ -92,14 +102,27 @@ void lcd16x2_i2c_clear(void);
#define LCD_RS (1 << 0)
#define LCD_RW (1 << 1)
#define LCD_EN (1 << 2)
#define LCD_BK_LIGHT (1 << 3)
// #define LCD_BK_LIGHT (1 << 3)
static uint8_t LCD_BK_LIGHT_STATE;
#define LCD_BK_LIGHT (LCD_BK_LIGHT_STATE << 3)

/* Library variables */
static I2C_HandleTypeDef* lcd16x2_i2cHandle;
static uint8_t LCD_I2C_SLAVE_ADDRESS=0;
#define LCD_I2C_SLAVE_ADDRESS_0 0x4E
#define LCD_I2C_SLAVE_ADDRESS_1 0x7E

/* Private functions */
void lcd16x2_i2c_backlight_control(uint8_t state)
{
(state == 0) ? (LCD_BK_LIGHT_STATE = 0) : (LCD_BK_LIGHT_STATE = 1);
}


void lcd16x2_i2c_backlight_toggle(void){
LCD_BK_LIGHT_STATE ^= 1;
}

/* Private functions */
static void lcd16x2_i2c_sendCommand(uint8_t command)
{
Expand Down