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Add FreeRTOS-Plus directory.
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Richard Barry
parent
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commit
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6798 changed files with 134949 additions and 19 deletions
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/***********************************************************************************
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Filename: lcd.c
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DESCRIPTION LCD Module utility functions.
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Written for KS0066u compatible LCD Module.
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(8 characters by 2 lines)
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Copyright : 2006 Renesas Technology Europe Ltd.
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Copyright : 2006 Renesas Technology Corporation.
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All Rights Reserved
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***********************************************************************************/
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/***********************************************************************************
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Revision History
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DD.MM.YYYY OSO-UID Description
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26.07.2006 RTE-MBA First Release
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***********************************************************************************/
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/**********************************************************************************
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System Includes
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***********************************************************************************/
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#include <machine.h>
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/**********************************************************************************
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User Includes
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***********************************************************************************/
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/* iodefine.h provides a structure to access all of the device registers. */
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#include "iodefine.h"
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/* rsk1664def.h provides common defines for widely used items. */
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#include "rskrx210def.h"
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#include "lcd.h"
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/*****************************************************************************
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Name: InitDisplay
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Parameters: none
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Returns: none
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Description: Intializes the LCD display.
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*****************************************************************************/
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void InitialiseDisplay( void )
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{
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/* Power Up Delay for LCD Module */
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EN_PIN = SET_BIT_HIGH;
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DisplayDelay(7000);
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EN_PIN = SET_BIT_LOW;
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/* Display initialises in 8 bit mode - so send one write (seen as 8 bit)
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to set to 4 bit mode. */
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/* Function Set */
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LCD_nibble_write(CTRL_WR,0x03);
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LCD_nibble_write(CTRL_WR,0x03);
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DisplayDelay(39);
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/* Configure display */
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LCD_nibble_write(CTRL_WR,0x03);
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LCD_nibble_write(CTRL_WR,0x02);
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LCD_nibble_write(CTRL_WR,(LCD_DISPLAY_ON | LCD_TWO_LINE ));
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LCD_nibble_write(CTRL_WR,(LCD_DISPLAY_ON | LCD_TWO_LINE ));
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DisplayDelay(39);
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/* Display ON/OFF control */
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LCD_write(CTRL_WR,LCD_CURSOR_OFF);
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DisplayDelay(39);
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/* Display Clear */
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LCD_write(CTRL_WR,LCD_CLEAR);
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DisplayDelay(1530);
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/* Entry Mode Set */
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LCD_write(CTRL_WR,0x06);
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LCD_write(CTRL_WR,LCD_HOME_L1);
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}
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/**********************************************************************************
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End of function InitialiseDisplay
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***********************************************************************************/
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/*****************************************************************************
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Name: DisplayString
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Parameters: position Line number of display
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string Pointer to data to be written to display.
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Last character should be null.
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Returns: none
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Description: This function controls LCD writes to line 1 or 2 of the LCD.
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You need to use the defines LCD_LINE1 and LCD_LINE2 in order
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to specify the starting position.
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For example, to start at the 2nd position on line 1...
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DisplayString(LCD_LINE1 + 1, "Hello")
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*****************************************************************************/
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void DisplayString(unsigned char position, char * string)
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{
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static unsigned char next_pos = 0xFF;
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/* Set line position if needed. We don't want to if we don't need
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to because LCD control operations take longer than LCD data
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operations. */
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if( next_pos != position)
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{
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if(position < LCD_LINE2)
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{
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/* Display on Line 1 */
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LCD_write(CTRL_WR, (unsigned char)(LCD_HOME_L1 + position) );
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}
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else
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{
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/* Display on Line 2 */
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LCD_write(CTRL_WR, (unsigned char)(LCD_HOME_L2 + position - LCD_LINE2) );
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}
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/* set position index to known value */
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next_pos = position;
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}
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do
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{
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LCD_write(DATA_WR,*string++);
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/* increment position index */
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next_pos++;
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}
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while(*string);
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}
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/**********************************************************************************
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End of function DisplayString
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***********************************************************************************/
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/*****************************************************************************
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Name: LCD_write
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Parameters: value - the value to write
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data_or_ctrl - To write value as DATA or CONTROL
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1 = DATA
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0 = CONTROL
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Returns: none
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Description: Writes data to display. Sends command to display.
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*****************************************************************************/
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void LCD_write(unsigned char data_or_ctrl, unsigned char value)
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{
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/* Write upper nibble first */
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LCD_nibble_write(data_or_ctrl, (value & 0xF0) >> 4);
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/* Write lower nibble second */
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LCD_nibble_write(data_or_ctrl, (value & 0x0F));
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}
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/**********************************************************************************
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End of function LCD_write
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***********************************************************************************/
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/*****************************************************************************
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Name: LCD_nibble_write
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Parameters: value - the value to write
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data_or_ctrl - To write value as DATA or CONTROL
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1 = DATA
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0 = CONTROL
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Returns: none
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Description: Writes data to display. Sends command to display.
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*****************************************************************************/
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void LCD_nibble_write(unsigned char data_or_ctrl, unsigned char value)
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{
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unsigned char ucStore;
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if (data_or_ctrl == DATA_WR)
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{
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RS_PIN = SET_BIT_HIGH;
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}
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else
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{
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RS_PIN = SET_BIT_LOW;
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}
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/* There must be 40ns between RS write and EN write */
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DisplayDelay(1);
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/* EN enable chip (HIGH) */
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EN_PIN = SET_BIT_HIGH;
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/* Tiny delay */
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DisplayDelay(1);
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/* Clear port bits used */
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/* Set upper lower 4 bits of nibble on port pins. */
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ucStore = DATA_PORT;
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ucStore &= ~DATA_PORT_MASK;
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/* OR in data */
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ucStore |= ((value << DATA_PORT_SHIFT) & DATA_PORT_MASK );
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/* Write lower 4 bits of nibble */
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DATA_PORT = ucStore;
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/* write delay while En High */
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DisplayDelay(20);
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/* Latch data by dropping EN */
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EN_PIN = SET_BIT_LOW;
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/* Data hold delay */
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DisplayDelay(20);
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if(data_or_ctrl == CTRL_WR)
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{
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/* Extra delay needed for control writes */
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DisplayDelay(40);
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}
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}
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/**********************************************************************************
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End of function LCD_nibble_write
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***********************************************************************************/
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/*****************************************************************************
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Name: DisplayDelay
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Parameters: units - Approximately in microseconds
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Returns: none
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Description: Delay routine for LCD display.
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*****************************************************************************/
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void DisplayDelay(unsigned long int units)
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{
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unsigned long counter = units * DELAY_TIMING;
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while(counter--)
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{
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nop(); // ~ 10ns
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}
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}
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/**********************************************************************************
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End of function DisplayDelay
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***********************************************************************************/
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