IIC_LCD1602 STM32-HAL驱动程序-硬件IIC

#include "IIC_1602.h" #include "i2c.h" /** * ***************************************************** * @addtogroup LCD_1602 Control operation function */ void LCDI2C_init(uint8_t lcd_Addr,uint8_t lcd_rows); void LCDI2C_expanderWrite(uint8_t _data); void LCDI2C_write4bits(uint8_t value) ; void LCDI2C_write4bits(uint8_t value); void LCDI2C_pulseEnable(uint8_t _data); void LCDI2C_command(uint8_t value); void LCDI2C_send(uint8_t value, uint8_t mode) ; void LCDI2C_display(void); void LCDI2C_clear(void); void LCDI2C_home(void); void LCDI2C_begin( uint8_t lines) ; void LCDI2C_backlight(void); void LCDI2C_clear(void); void LCDI2C_setCursor(uint8_t col, uint8_t row); void LCDI2C_Show_String(uint8_t col, uint8_t row,char* str); void LCDI2C_Show_Char(uint8_t col, uint8_t row,char str); uint32_t LCDI2C_pow(uint8_t m,uint8_t n); void LCDI2C_Show_Num(uint8_t col, uint8_t row,uint8_t len,int num); void LCDI2C_Show_FloatNum(uint8_t col, uint8_t row,uint8_t len1,uint8_t len2,float num); /******************************************************/ LiquidCrystal_I2C_Def lcdi2c; /** * @brief IIC_LCD1602 initialization * @param lcd_Addr LCD1602 slave address,The device 7 bits address value in datasheet must be shifted to the left before calling the interface * @param Lcd_rows Number of lines supported by LCD */ void LCDI2C_init(uint8_t lcd_Addr,uint8_t lcd_rows) { lcdi2c.Addr = lcd_Addr; lcdi2c.rows = lcd_rows; lcdi2c.backlightval = LCD_BACKLIGHT; lcdi2c.displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS; LCDI2C_begin(lcd_rows); LCDI2C_backlight(); LCDI2C_clear(); } void LCDI2C_expanderWrite(uint8_t _data) { uint8_t buf=0; buf = _data|lcdi2c.backlightval; HAL_I2C_Master_Transmit(&hi2c1,lcdi2c.Addr,&buf,1,0xffff); } void LCDI2C_write4bits(uint8_t value) { LCDI2C_expanderWrite(value); LCDI2C_pulseEnable(value); } void LCDI2C_pulseEnable(uint8_t _data) { LCDI2C_expanderWrite(_data | En); // En high delay_us(1); /* enable pulse must be >450ns*/ LCDI2C_expanderWrite(_data & ~En); // En low delay_us(50); /* commands need > 37us to settle*/ } void LCDI2C_command(uint8_t value){ LCDI2C_send(value, 0); } void LCDI2C_write(uint8_t value){ LCDI2C_send(value, Rs); } /** * @brief write either command or data * @param value The value to be written * @param mode Write data or command */ void LCDI2C_send(uint8_t value, uint8_t mode) { uint8_t highnib=value&0xf0; uint8_t lownib=(value<<4)&0xf0; LCDI2C_write4bits((highnib)|mode); LCDI2C_write4bits((lownib)|mode); } /** * @brief LCD_1602 Open display */ void LCDI2C_display(void) { lcdi2c.displaycontrol |= LCD_DISPLAYON; LCDI2C_command(LCD_DISPLAYCONTROL | lcdi2c.displaycontrol); } /** * @brief Clear display,set cursor position to zero */ void LCDI2C_clear(void) { LCDI2C_command(LCD_CLEARDISPLAY); delay_us(3000); /* this command takes a long time!*/ } /** * @brief set cursor position to zero */ void LCDI2C_home(void) { LCDI2C_command(LCD_RETURNHOME); delay_us(3000); /* this command takes a long time!*/ } /** * @brief Start to configure the LCD * @param lines The number of lines to be displayed on the LCD */ void LCDI2C_begin( uint8_t lines) { if (lines > 1) { lcdi2c.displayfunction |= LCD_2LINE; } lcdi2c.numlines = lines; LCDI2C_expanderWrite(lcdi2c.backlightval); /*reset expanderand turn backlight off (Bit 8 =1)*/ delay_us(1000); /* *************************************************** * put the LCD into 4 bit mode * this is according to the hitachi HD44780 datasheet * figure 24, pg 46 * we start in 8bit mode, try to set 4 bit mode�� * *************************************************** */ LCDI2C_write4bits(0x03 << 4); delay_us(4500); // wait min 4.1ms // second try LCDI2C_write4bits(0x03 << 4); delay_us(4500); // wait min 4.1ms // third go! LCDI2C_write4bits(0x03 << 4); delay_us(150); // finally, set to 4-bit interface LCDI2C_write4bits(0x02 << 4); // set # lines, font size, etc. LCDI2C_command(LCD_FUNCTIONSET | lcdi2c.displayfunction); // turn the display on with no cursor or blinking default lcdi2c.displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF; LCDI2C_display(); // clear it off LCDI2C_clear(); // Initialize to default text direction (for roman languages) lcdi2c.displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT; // set the entry mode LCDI2C_command(LCD_ENTRYMODESET | lcdi2c.displaymode); LCDI2C_home(); } /** * @brief LCD_1602 Open BACKLIGHT */ void LCDI2C_backlight(void) { lcdi2c.backlightval=LCD_BACKLIGHT; LCDI2C_expanderWrite(0); } /** * @brief Set location information * @param col Horizontal axis * @param row Vertical axis */ void LCDI2C_setCursor(uint8_t col, uint8_t row) { int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 }; if ( row > lcdi2c.numlines ) { row = lcdi2c.numlines-1; /* we count rows starting w/0*/ } LCDI2C_command(LCD_SETDDRAMADDR | (col + row_offsets[row])); } /** * @brief Display the character at the specified position * @param col Horizontal axis * @param row Vertical axis * @param str Character to write */ void LCDI2C_Show_Char(uint8_t col, uint8_t row,char str) { LCDI2C_setCursor(col,row); LCDI2C_write(str); } /** * @brief Display the string at the specified position * @param col Horizontal axis * @param row Vertical axis * @param str String to write */ void LCDI2C_Show_String(uint8_t col, uint8_t row,char* str) { uint8_t i=0; LCDI2C_setCursor(col,row); while(str[i]) { LCDI2C_write(str[i]); i++; } } /** * @brief Implement m^n function */ uint32_t LCDI2C_pow(uint8_t m,uint8_t n) { uint32_t result=1; while(n--)result*=m; return result; } /** * @brief Display number function * @param col Horizontal axis * @param row Vertical axis * @param len Displayed number length * @param num Displayed number */ void LCDI2C_Show_Num(uint8_t col, uint8_t row,uint8_t len,int num) { uint8_t t,temp; uint8_t enshow=0; for(t=0;t<len;t++) { temp=(num/LCDI2C_pow(10,len-t-1))%10; if(enshow==0&&t<(len-1)) { if(temp==0) { LCDI2C_Show_Char(col+t,row,' '); continue; }else enshow=1; } LCDI2C_Show_Char(col+t,row,temp+'0'); } } /** * @brief Display decimal function * @param col: Horizontal axis * @param row: Vertical axis * @param len1: Integer length * @param len2: Decimal length * @param num: number to display */ void LCDI2C_Show_FloatNum(uint8_t col, uint8_t row,uint8_t len1,uint8_t len2,float num) { int i; LCDI2C_Show_Num(col,row,len1,num); num=num-(int)num; LCDI2C_Show_Char(col+len1,row,'.'); for (i=0;i<len2;i++) num=num*10; LCDI2C_Show_Num(col+len1+1,row,len2,num); }