SPI Lcd8 Library

SPI Lcd8 (8-bit interface) Library

The mikroC PRO for AVR provides a library for communication with Lcd (with HD44780 compliant controllers) in 8-bit mode via SPI interface.

For creating a custom set of Lcd characters use Lcd Custom Character Tool.

Important :

The library uses the SPI module for communication. The user must initialize the SPI module before using the SPI Lcd8 Library.
This Library is designed to work with the mikroElektronika's Serial Lcd/Glcd Adapter Board pinout. See schematic at the bottom of this page for details.

Library Dependency Tree

External dependencies of SPI Lcd Library

The implementation of SPI Lcd Library routines is based on Port Expander Library routines.

External dependencies are the same as Port Expander Library external dependencies.

SPI_Lcd8_Config

Prototype	void SPI_Lcd8_Config(char DeviceAddress);
Returns	Nothing.
Description	Initializes the Lcd module via SPI interface. Parameters : `DeviceAddress:` SPI expander hardware address, see schematic at the bottom of this page
Requires	Global variables : `SPExpanderCS`: Chip Select line `SPExpanderRST`: Reset line `SPExpanderCS_Direction`: Direction of the Chip Select pin `SPExpanderRST_Direction`: Direction of the Reset pin must be defined before using this function. SPI module needs to be initialized. See SPI1_Init and SPI1_Init_Advanced routines.
Example	// Port Expander module connections sbit SPExpanderRST at PORTB0_bit; sbit SPExpanderCS at PORTB1_bit; sbit SPExpanderRST_Direction at DDB0_bit; sbit SPExpanderCS_Direction at DDB1_bit; // End Port Expander module connections ... // If Port Expander Library uses SPI1 module SPI1_Init(); // Initialize SPI module used with PortExpander SPI_Lcd8_Config(0); // intialize Lcd in 8bit mode via SPI

SPI_Lcd8_Out

Prototype	void SPI_Lcd8_Out(unsigned short row, unsigned short column, char *text);
Returns	Nothing.
Description	Prints text on Lcd starting from specified position. Both string variables and literals can be passed as a text. Parameters : `row:` starting position row number `column:` starting position column number `text:` text to be written
Requires	Lcd needs to be initialized for SPI communication, see SPI_Lcd8_Config routine.
Example	// Write text "Hello!" on Lcd starting from row 1, column 3: SPI_Lcd8_Out(1, 3, "Hello!");

SPI_Lcd8_Out_Cp

Prototype	void SPI_Lcd8_Out_CP(char *text);
Returns	Nothing.
Description	Prints text on Lcd at current cursor position. Both string variables and literals can be passed as a text. Parameters : `text:` text to be written
Requires	Lcd needs to be initialized for SPI communication, see SPI_Lcd8_Config routine.
Example	// Write text "Here!" at current cursor position: SPI_Lcd8_Out_Cp("Here!");

SPI_Lcd8_Chr

Prototype	void SPI_Lcd8_Chr(unsigned short row, unsigned short column, char out_char);
Returns	Nothing.
Description	Prints character on Lcd at specified position. Both variables and literals can be passed as character. Parameters : `row:` writing position row number `column:` writing position column number `out_char:` character to be written
Requires	Lcd needs to be initialized for SPI communication, see SPI_Lcd8_Config routine.
Example	// Write character "i" at row 2, column 3: SPI_Lcd8_Chr(2, 3, 'i');

SPI_Lcd8_Chr_Cp

Prototype	void SPI_Lcd8_Chr_CP(char out_char);
Returns	Nothing.
Description	Prints character on Lcd at current cursor position. Both variables and literals can be passed as character. Parameters : `out_char:` character to be written
Requires	Lcd needs to be initialized for SPI communication, see SPI_Lcd8_Config routine.
Example	Print “e” at current cursor position: // Write character "e" at current cursor position: SPI_Lcd8_Chr_Cp('e');

SPI_Lcd8_Cmd

Prototype	void SPI_Lcd8_Cmd(char out_char);
Returns	Nothing.
Description	Sends command to Lcd. Parameters : `out_char:` command to be sent Note : Predefined constants can be passed to the function, see Available SPI Lcd8 Commands.
Requires	Lcd needs to be initialized for SPI communication, see SPI_Lcd8_Config routine.
Example	// Clear Lcd display: SPI_Lcd8_Cmd(_LCD_CLEAR);

Available SPI Lcd8 Commands

SPI Lcd8 Command	Purpose
_LCD_FIRST_ROW	Move cursor to the 1st row
_LCD_SECOND_ROW	Move cursor to the 2nd row
_LCD_THIRD_ROW	Move cursor to the 3rd row
_LCD_FOURTH_ROW	Move cursor to the 4th row
_LCD_CLEAR	Clear display
_LCD_RETURN_HOME	Return cursor to home position, returns a shifted display to its original position. Display data RAM is unaffected.
_LCD_CURSOR_OFF	Turn off cursor
_LCD_UNDERLINE_ON	Underline cursor on
_LCD_BLINK_CURSOR_ON	Blink cursor on
_LCD_MOVE_CURSOR_LEFT	Move cursor left without changing display data RAM
_LCD_MOVE_CURSOR_RIGHT	Move cursor right without changing display data RAM
_LCD_TURN_ON	Turn Lcd display on
_LCD_TURN_OFF	Turn Lcd display off
_LCD_SHIFT_LEFT	Shift display left without changing display data RAM
_LCD_SHIFT_RIGHT	Shift display right without changing display data RAM

Library Example

This example demonstrates how to communicate Lcd in 8-bit mode via the SPI module, using serial to parallel convertor MCP23S17.

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char *text = "mikroE";

// Port Expander module connections
sbit  SPExpanderRST at PORTB0_bit;
sbit  SPExpanderCS  at PORTB1_bit;
sbit  SPExpanderRST_Direction at DDB0_bit;
sbit  SPExpanderCS_Direction  at DDB1_bit;
// End Port Expander module connections

void main() {

  // If Port Expander Library uses SPI1 module
  SPI1_Init();                                // Initialize SPI module used with PortExpander

  // // If Port Expander Library uses SPI2 module
  // SPI2_Init();                             // Initialize SPI module used with PortExpander

  SPI_Lcd8_Config(0);                         // Intialize Lcd in 8bit mode via SPI
  SPI_Lcd8_Cmd(_LCD_CLEAR);                   // Clear display
  SPI_Lcd8_Cmd(_LCD_CURSOR_OFF);              // Turn cursor off
  SPI_Lcd8_Out(1,6, text);                    // Print text to Lcd, 1st row, 6th column...
  SPI_Lcd8_Chr_CP('!');                       // Append '!'
  SPI_Lcd8_Out(2,1, "mikroElektronika");      // Print text to Lcd, 2nd row, 1st column...
  SPI_Lcd8_Out(3,1, text);                    // For Lcd modules with more than two rows
  SPI_Lcd8_Out(4,15, text);                   // For Lcd modules with more than two rows
}

HW Connection

SPI Lcd8 HW connection

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