ARM LPC2129 Mini Development Board – LCD Interfacing
Here ARM LPC2129 Mini Development Board is interfaced with a LCD module (2×16) operating at 5V. The voltage at the third pin of the LCD used to adjusting contrast. LCD can work either in 4 or 8 bit mode. Here, the circuit is designed to work in 4bit mode. Control lines (RS, R/W ,E) are connected to port pins P1.17 ,P1.18 , P1.19 and data lines (D4-D7) to port pins P1.20 ,P1.21 ,P1.22 ,P1.23 in 4bit mode. For reliable Performance, LCD has to be initialized. On powering microcontroller send initialization commands to LCD for better working. The sample code below gives LCD display output ” RhydoLABZ ” in line 1 and “Cochin” in line 2 .
Schematic:
Sample code :
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/******************************************************************************************************* * LCD PROGRAM * ******************************************************************************************************** * HEADER DECLARATIONS * *******************************************************************************************************/ #include<lpc21xx.h> #define RS 0x00020000 /* 17th pin RS */ #define RW 0X00040000 /* 18th pin R/W */ #define EN 0X00080000 /* 19th pin EN */ #define CLR 0X00FE0000 /******************************************************************************************************* * Function : Delay * * Description : command for Delay * * Parameter : x, the value for delay *******************************************************************************************************/ int Delay(unsigned int x) { x=x*12000; while(x!=0){ x--; } return 0; } /******************************************************************************************************* * Function : Lcd_Command * * Description : command for lcd * * Parameter : command, address value ********************************************************************************************************/ void Lcd_Command(char command) { int Temp; IO1CLR = CLR; /* Clear ALL 16-23 Pins */ IO1SET = EN; /* SET 19th Pin [EN] */ IO1CLR = RS; /* Clear 17th Pin [RS] */ IO1CLR = RW; /* Clear 18th Pin [R/W] */ Temp = (command & 0xF0) << 16; /* Higher Nibble Extracting 0X30 [3-High] & [4-7] Shifted To [20-23] */ IO1SET = IO1SET | Temp; /* 0X00080000 | 0X00300000[Shifted] = 0X00380000 [Only '3' Is in [20-23]pins */ Delay(2); /* Minimum Delay Time */ IO1CLR = EN; /* ENABLE High-Low Transition */ } /******************************************************************************************************** * Function : Lcd_Command1 * * Description : command for lcd * * Parameter : command1, address value ********************************************************************************************************/ void Lcd_Command1(char command1) { int Temp; IO1CLR = CLR; /* Clear ALL 16-23 Pins */ IO1SET = EN; /* SET 19th Pin [EN] */ IO1CLR = RS; /* Clear 17th Pin [RS] */ IO1CLR = RW; /* Clear 18th Pin [R/W] */ Temp = (command1 & 0xF0) << 16; /* Higher Nibble Extracting 0X30 [3-High] & [4-7] Shifted To [20-23] */ IO1SET = IO1SET | Temp; /* 0X00080000 | 0X00300000[Shifted] = 0X00380000 [Only '3' Is in [20-23]pins */ Delay(2); /* Minimum DelayTime */ IO1CLR = EN; /* ENABLE High-Low Transition */ IO1CLR = CLR; /* Clear ALL 16-23 Pins */ IO1SET = EN; /* SET 19th Pin [EN] */ IO1CLR = RW; /* Clear 17th Pin [RS] */ IO1CLR = RS; /* Clear 18th Pin [R/W] */ Temp = (command1 & 0x0F) << 20; /* Lower Nibble [0-3] Shifted To [20-23] & [0-3] Shifted To [20-23] */ IO1SET = IO1SET | Temp; /* 0X00080000 | 0X00800000[Shifted] = 0X00880000 [Only '8' Is in [20-23]pins */ Delay(2); /* Minimum Delay Time */ IO1CLR = EN; /* ENABLE High-Low Transition */ } /******************************************************************************************************* * Function : Lcd_Data * * Description : display command for lcd * * Parameter : data, single data *******************************************************************************************************/ void Lcd_Data(char data) { int Temp; IO1CLR = CLR; /* Clear ALL 16-23 Pins */ IO1SET = EN; /* SET 19th Pin [EN] */ IO1CLR = RW; /* Clear 18th Pin [R/W] */ IO1SET = RS; /* Clear 17th Pin [RS] */ Temp = (data & 0xF0) << 16; /* Higher Nibble Extracting 0X30 [3-High] & [4-7] Shifted To [20-23] */ IO1SET = IO1SET | Temp; /* 0X00080000 | 0X00300000[Shifted] = 0X00380000 [Only '3' Is in [20-23]pins */ Delay(2); /* Minimum DelayTime */ IO1CLR = EN; /* ENABLE High-Low Transition */ IO1CLR = CLR; /* Clear ALL 16-23 Pins */ IO1SET = EN; /* SET 19th Pin [EN] */ IO1CLR = RW; /* Clear 18th Pin [R/W] */ IO1SET = RS; /* Clear 17th Pin [RS] */ Temp = (data & 0x0F)<<20; /* Lower Nibble [0-3] Shifted To [20-23] & [0-3] Shifted To [20-23] */ IO1SET = IO1SET | Temp; /* 0X00080000 | 0X00800000[Shifted] = 0X00880000 [Only '8' Is in [20-23]pins */ Delay(2); /* Minimum DelayTime */ IO1CLR = EN; /* ENABLE High-Low Transition */ } /******************************************************************************************************* * Function : lCD_string * * Description : display group of data * * Parameter : dat, group of data *******************************************************************************************************/ void Lcd_String(unsigned char *dat) { while(*dat!='\0') { Lcd_Data(*dat); dat++; } } /****************************************************************************************************** * Function : Lcd_Init * * Description : Funtion for initialize LCD to display data * * Parameter : None ********************************************************************************************************/ void Lcd_Init(void) { Delay(15); /* Delay (1.5ms) */ Lcd_Command(0x30); /* Single line enable(2X16) */ Delay(10); /* Delay (10us) */ Lcd_Command(0x30); /* Single line enable(2X16) */ Delay(5); /* Delay (0.5ms) */ Lcd_Command(0x30); /* Single line enable(2X16) */ Lcd_Command(0x20); /* 4-bit Mode Enable */ Lcd_Command1(0x28); /* Double line enable (2X16) */ Lcd_Command1(0x01); /* Clear LCD */ Lcd_Command1(0x06); /* Automatic increment */ Lcd_Command1(0x0C); /* Cursor OFF /Display ON */ } /******************************************************************************************************** * Function : PORT INITIALIZATION * * Description : Funtion for initialize ports * * Parameter : None ********************************************************************************************************/ void Port_Initial(void) { IO1DIR = 0x00FE0000; /* 17-23 Pins As Output for LCD */ IO0DIR = 0x00000000; PINSEL0 = 0x00000000; PINSEL1 = 0x05000000; PINSEL2 = 0x00000000; } /******************************************************************************************************** * CODE AREA * ********************************************************************************************************/ int main() { Port_Initial(); /* Initialize direction & pinsel of ports */ Lcd_Init(); /* LCD initialization */ Lcd_String(" RhydoLABZ "); /* LCD display */ Lcd_Command1(0xC0); /* LCD Location (0xC0) */ Lcd_String(" Cochin "); /* LCD display */ while(1); } /********************************************END********************************************************/ |
OUTPUT
Topics related to ARM LPC2129 Mini Development Board
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