SPI Lcd8 (8-bit interface) Library

The mikroPascal PRO for ARM 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 :

Library Dependency Tree

SPI Lcd8 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.

Library Routines

SPI_Lcd8_Config

Prototype

procedure SPI_Lcd8_Config(DeviceAddress : byte);
Description

Initializes the Lcd module via SPI interface.
Parameters
  • DeviceAddress: SPI expander hardware address, see schematic at the bottom of this page
Returns

Nothing.
Requires

External dependencies are the same as Port Expander Library external dependencies.
The SPI module needs to be initialized. See SPIx_Init and SPIx_Init_Advanced routines.

Example

Stellaris

// Port Expander module connections
var SPExpanderRST           : sbit at GPIO_PORTA_DATA0_bit;
    SPExpanderCS            : sbit at GPIO_PORTA_DATA1_bit;
    SPExpanderRST_Direction : sbit at GPIO_PORTA_DIR0_bit;
    SPExpanderCS_Direction  : sbit at GPIO_PORTA_DIR1_bit;
// End Port Expander module connections
...

SPI1_Init();                                // Initialize SPI module used with PortExpander
SPI_Lcd8_Config(0);                         // intialize Lcd in 8bit mode via SPI

MSP432

// Port Expander module connections
var SPExpanderRST           : sbit at DIO_P6OUT.B0;
    SPExpanderCS            : sbit at DIO_P6OUT.B1;
    SPExpanderRST_Direction : sbit at DIO_P6DIR.B0;
    SPExpanderCS_Direction  : sbit at DIO_P6DIR.B1;
// End Port Expander module connections
...

// If Port Expander Library uses SPI module :
SPI1_Init();  // Initialize SPI module used with PortExpander
SPI_Lcd8_Config(0);

STM32

// Port Expander module connections
var SPExpanderRST           : sbit at GPIOB_ODR.B0;
    SPExpanderCS            : sbit at GPIOB_ODR.B1;
// End Port Expander module connections
...
// Initialize SPI module used with PortExpander
SPI1_Init_Advanced(_SPI_FPCLK_DIV4, _SPI_MASTER or _SPI_8_BIT or
                   _SPI_CLK_IDLE_LOW or _SPI_FIRST_CLK_EDGE_TRANSITION or
                   _SPI_MSB_FIRST or _SPI_SS_DISABLE or _SPI_SSM_ENABLE or _SPI_SSI_1,
                   @_GPIO_MODULE_SPI1_PB345);

SPI_Lcd8_Config(0);                         // intialize Lcd in 8bit mode via SPI

CEC1x02

// Port Expander module connections
var SPExpanderRST : sbit at GPIO_OUTPUT_PIN_027_bit;
    SPExpanderCS  : sbit at GPIO_OUTPUT_PIN_146_bit;
// End Port Expander module connections

...

// Initialize SPI module used with PortExpander
SPI0_Init_Advanced(1000000,0,0);

SPI_Lcd8_Config(0);
Notes

None.

SPI_Lcd8_Out

Prototype

procedure SPI_Lcd8_Out(row, column: byte; var text: string);
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
Returns

Nothing.
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!');
Notes

None.

SPI_Lcd8_Out_Cp

Prototype

procedure SPI_Lcd8_Out_CP(var text: string);
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
Returns

Nothing.
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!');
Notes

None.

SPI_Lcd8_Chr

Prototype

procedure SPI_Lcd8_Chr(row, column, out_char: byte);
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
Returns

Nothing.
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');
Notes

None.

SPI_Lcd8_Chr_Cp

Prototype

procedure SPI_Lcd8_Chr_CP(out_char: byte);
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
Returns

Nothing.
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');
Notes

None.

SPI_Lcd8_Cmd

Prototype

procedure SPI_Lcd8_Cmd(out_char: byte);
Description

Sends command to Lcd.
Parameters
  • out_char: command to be sent
Returns

Nothing.
Requires

Lcd needs to be initialized for SPI communication, see SPI_Lcd8_Config routine.
Example 
// Clear Lcd display:
SPI_Lcd8_Cmd(_LCD_CLEAR);
Notes

Predefined constants can be passed to the routine, see Available SPI Lcd8 Commands.

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