/*********************************************************************
*
* LCD Access Routines
*
*********************************************************************
* FileName: LCDBlocking.c
* Dependencies: None
* Processor: PIC18, PIC24F, PIC24H, dsPIC30F, dsPIC33F, PIC32
* Compiler: Microchip C32 v1.05 or higher
* Microchip C30 v3.12 or higher
* Microchip C18 v3.30 or higher
* HI-TECH PICC-18 PRO 9.63PL2 or higher
* Company: Microchip Technology, Inc.
*
* Software License Agreement
*
* Copyright (C) 2002-2009 Microchip Technology Inc. All rights
* reserved.
*
* Microchip licenses to you the right to use, modify, copy, and
* distribute:
* (i) the Software when embedded on a Microchip microcontroller or
* digital signal controller product ("Device") which is
* integrated into Licensee's product; or
* (ii) ONLY the Software driver source files ENC28J60.c, ENC28J60.h,
* ENCX24J600.c and ENCX24J600.h ported to a non-Microchip device
* used in conjunction with a Microchip ethernet controller for
* the sole purpose of interfacing with the ethernet controller.
*
* You should refer to the license agreement accompanying this
* Software for additional information regarding your rights and
* obligations.
*
* THE SOFTWARE AND DOCUMENTATION ARE PROVIDED "AS IS" WITHOUT
* WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT
* LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* MICROCHIP BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA, COST OF
* PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR SERVICES, ANY CLAIMS
* BY THIRD PARTIES (INCLUDING BUT NOT LIMITED TO ANY DEFENSE
* THEREOF), ANY CLAIMS FOR INDEMNITY OR CONTRIBUTION, OR OTHER
* SIMILAR COSTS, WHETHER ASSERTED ON THE BASIS OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE), BREACH OF WARRANTY, OR OTHERWISE.
*
*
* Author Date Comment
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Howard Schlunder 4/03/06 Original
* Howard Schlunder 4/12/06 Changed from using PMP to LCDWrite()
* Howard Schlunder 8/10/06 Fixed a delay being too short
* when CLOCK_FREQ was a smaller
* value, added FOUR_BIT_MODE
********************************************************************/
#define __LCDBLOCKING_C
#include "TCPIP Stack/TCPIP.h"
#if defined(USE_LCD)
//#define FOUR_BIT_MODE
#define SAMSUNG_S6A0032 // This LCD driver chip has a different means of entering 4-bit mode.
// LCDText is a 32 byte shadow of the LCD text. Write to it and
// then call LCDUpdate() to copy the string into the LCD module.
BYTE LCDText[16*2+1];
/******************************************************************************
* Function: static void LCDWrite(BYTE RS, BYTE Data)
*
* PreCondition: None
*
* Input: RS - Register Select - 1:RAM, 0:Config registers
* Data - 8 bits of data to write
*
* Output: None
*
* Side Effects: None
*
* Overview: Controls the Port I/O pins to cause an LCD write
*
* Note: None
*****************************************************************************/
static void LCDWrite(BYTE RS, BYTE Data)
{
#if defined(LCD_DATA_TRIS)
LCD_DATA_TRIS = 0x00;
#else
LCD_DATA0_TRIS = 0;
LCD_DATA1_TRIS = 0;
LCD_DATA2_TRIS = 0;
LCD_DATA3_TRIS = 0;
#if !defined(FOUR_BIT_MODE)
LCD_DATA4_TRIS = 0;
LCD_DATA5_TRIS = 0;
LCD_DATA6_TRIS = 0;
LCD_DATA7_TRIS = 0;
#endif
#endif
LCD_RS_TRIS = 0;
LCD_RD_WR_TRIS = 0;
LCD_RD_WR_IO = 0;
LCD_RS_IO = RS;
#if defined(FOUR_BIT_MODE)
#if defined(LCD_DATA_IO)
LCD_DATA_IO = Data>>4;
#else
LCD_DATA0_IO = ((Data & 0x10) == 0x10);
LCD_DATA1_IO = ((Data & 0x20) == 0x20);
LCD_DATA2_IO = ((Data & 0x40) == 0x40);
LCD_DATA3_IO = ((Data & 0x80) == 0x80);
#endif
Nop(); // Wait Data setup time (min 40ns)
Nop();
LCD_E_IO = 1;
Nop(); // Wait E Pulse width time (min 230ns)
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
LCD_E_IO = 0;
#endif
#if defined(LCD_DATA_IO)
LCD_DATA_IO = Data;
#else
LCD_DATA0_IO = ((Data & 0x01) == 0x01);
LCD_DATA1_IO = ((Data & 0x02) == 0x02);
LCD_DATA2_IO = ((Data & 0x04) == 0x04);
LCD_DATA3_IO = ((Data & 0x08) == 0x08);
#if !defined(FOUR_BIT_MODE)
LCD_DATA4_IO = ((Data & 0x10) == 0x10);
LCD_DATA5_IO = ((Data & 0x20) == 0x20);
LCD_DATA6_IO = ((Data & 0x40) == 0x40);
LCD_DATA7_IO = ((Data & 0x80) == 0x80);
#endif
#endif
Nop(); // Wait Data setup time (min 40ns)
Nop();
LCD_E_IO = 1;
Nop(); // Wait E Pulse width time (min 230ns)
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
LCD_E_IO = 0;
// // Uncomment if you want the data bus to go High-Z when idle
// // Note that this may make analog functions work poorly when using
// // Explorer 16 revision 5 boards with a 5V LCD on it. The 5V LCDs have
// // internal weak pull ups to 5V on each of the I/O pins, which will
// // backfeed 5V weekly onto non-5V tolerant PIC I/O pins.
// #if defined(LCD_DATA_TRIS)
// LCD_DATA_TRIS = 0xFF;
// #else
// LCD_DATA0_TRIS = 1;
// LCD_DATA1_TRIS = 1;
// LCD_DATA2_TRIS = 1;
// LCD_DATA3_TRIS = 1;
// #if !defined(FOUR_BIT_MODE)
// LCD_DATA4_TRIS = 1;
// LCD_DATA5_TRIS = 1;
// LCD_DATA6_TRIS = 1;
// LCD_DATA7_TRIS = 1;
// #endif
// #endif
// LCD_RS_TRIS = 1;
// LCD_RD_WR_TRIS = 1;
}
/******************************************************************************
* Function: void LCDInit(void)
*
* PreCondition: None
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: LCDText[] is blanked, port I/O pin TRIS registers are
* configured, and the LCD is placed in the default state
*
* Note: None
*****************************************************************************/
void LCDInit(void)
{
BYTE i;
memset(LCDText, ' ', sizeof(LCDText)-1);
LCDText[sizeof(LCDText)-1] = 0;
// Setup the I/O pins
LCD_E_IO = 0;
LCD_RD_WR_IO = 0;
#if defined(LCD_DATA_TRIS)
LCD_DATA_TRIS = 0x00;
#else
LCD_DATA0_TRIS = 0;
LCD_DATA1_TRIS = 0;
LCD_DATA2_TRIS = 0;
LCD_DATA3_TRIS = 0;
#if !defined(FOUR_BIT_MODE)
LCD_DATA4_TRIS = 0;
LCD_DATA5_TRIS = 0;
LCD_DATA6_TRIS = 0;
LCD_DATA7_TRIS = 0;
#endif
#endif
LCD_RD_WR_TRIS = 0;
LCD_RS_TRIS = 0;
LCD_E_TRIS = 0;
// Wait the required time for the LCD to reset
DelayMs(40);
// Set the default function
// Go to 8-bit mode first to reset the instruction state machine
// This is done in a loop 3 times to absolutely ensure that we get
// to 8-bit mode in case if the device was previously booted into
// 4-bit mode and our PIC got reset in the middle of the LCD
// receiving half (4-bits) of an 8-bit instruction
LCD_RS_IO = 0;
#if defined(LCD_DATA_IO)
LCD_DATA_IO = 0x03;
#else
LCD_DATA0_IO = 1;
LCD_DATA1_IO = 1;
LCD_DATA2_IO = 0;
LCD_DATA3_IO = 0;
#if !defined(FOUR_BIT_MODE)
LCD_DATA4_IO = 0;
LCD_DATA5_IO = 0;
LCD_DATA6_IO = 0;
LCD_DATA7_IO = 0;
#endif
#endif
Nop(); // Wait Data setup time (min 40ns)
Nop();
for(i = 0; i < 3u; i++)
{
LCD_E_IO = 1;
Delay10us(1); // Wait E Pulse width time (min 230ns)
LCD_E_IO = 0;
DelayMs(2);
}
#if defined(FOUR_BIT_MODE)
#if defined(SAMSUNG_S6A0032)
// Enter 4-bit mode (requires only 4-bits on the S6A0032)
#if defined(LCD_DATA_IO)
LCD_DATA_IO = 0x02;
#else
LCD_DATA0_IO = 0;
LCD_DATA1_IO = 1;
LCD_DATA2_IO = 0;
LCD_DATA3_IO = 0;
#endif
Nop(); // Wait Data setup time (min 40ns)
Nop();
LCD_E_IO = 1;
Delay10us(1); // Wait E Pulse width time (min 230ns)
LCD_E_IO = 0;
#else
// Enter 4-bit mode with two lines (requires 8-bits on most LCD controllers)
LCDWrite(0, 0x28);
#endif
#else
// Use 8-bit mode with two lines
LCDWrite(0, 0x38);
#endif
Delay10us(5);
// Set the entry mode
LCDWrite(0, 0x06); // Increment after each write, do not shift
Delay10us(5);
// Set the display control
LCDWrite(0, 0x0C); // Turn display on, no cusor, no cursor blink
Delay10us(5);
// Clear the display
LCDWrite(0, 0x01);
DelayMs(2);
}
/******************************************************************************
* Function: void LCDUpdate(void)
*
* PreCondition: LCDInit() must have been called once
*
* Input: LCDText[]
*
* Output: None
*
* Side Effects: None
*
* Overview: Copies the contents of the local LCDText[] array into the
* LCD's internal display buffer. Null terminators in
* LCDText[] terminate the current line, so strings may be
* printed directly to LCDText[].
*
* Note: None
*****************************************************************************/
void LCDUpdate(void)
{
BYTE i, j;
// Go home
LCDWrite(0, 0x02);
DelayMs(2);
// Output first line
for(i = 0; i < 16u; i++)
{
// Erase the rest of the line if a null char is
// encountered (good for printing strings directly)
if(LCDText[i] == 0u)
{
for(j=i; j < 16u; j++)
{
LCDText[j] = ' ';
}
}
LCDWrite(1, LCDText[i]);
Delay10us(5);
}
// Set the address to the second line
LCDWrite(0, 0xC0);
Delay10us(5);
// Output second line
for(i = 16; i < 32u; i++)
{
// Erase the rest of the line if a null char is
// encountered (good for printing strings directly)
if(LCDText[i] == 0u)
{
for(j=i; j < 32u; j++)
{
LCDText[j] = ' ';
}
}
LCDWrite(1, LCDText[i]);
Delay10us(5);
}
}
/******************************************************************************
* Function: void LCDErase(void)
*
* PreCondition: LCDInit() must have been called once
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Clears LCDText[] and the LCD's internal display buffer
*
* Note: None
*****************************************************************************/
void LCDErase(void)
{
// Clear display
LCDWrite(0, 0x01);
DelayMs(2);
// Clear local copy
memset(LCDText, ' ', 32);
}
#endif //#if defined(USE_LCD)
|