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/*********************************************************************
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*
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* External LCD access routines
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*
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*********************************************************************
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* FileName: XLCD.c
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* Dependencies: xlcd.h
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* Processor: PIC18
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* Complier: MCC18 v1.00.50 or higher
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* HITECH PICC-18 V8.10PL1 or higher
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* Company: Microchip Technology, Inc.
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*
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* Software License Agreement
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*
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* The software supplied herewith by Microchip Technology Incorporated
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* (the “Company”) for its PICmicro® Microcontroller is intended and
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* supplied to you, the Company’s customer, for use solely and
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* exclusively on Microchip PICmicro Microcontroller products. The
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* software is owned by the Company and/or its supplier, and is
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* protected under applicable copyright laws. All rights are reserved.
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* Any use in violation of the foregoing restrictions may subject the
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* user to criminal sanctions under applicable laws, as well as to
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* civil liability for the breach of the terms and conditions of this
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* license.
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*
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* THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES,
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* WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
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* TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,
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* IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
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* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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*
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* HiTech PICC18 Compiler Options excluding device selection:
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* -FAKELOCAL -G -E -C
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*
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*
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*
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*
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* Author Date Comment
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*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* Nilesh Rajbharti 5/8/02 Original (Rev 1.0)
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* Nilesh Rajbharti 7/10/02 Optimized
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********************************************************************/
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#include "xlcd.h"
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/*********************************************************************
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* Function: void XLCDInit(void)
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*
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* PreCondition: None
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*
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* Input: None
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*
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* Output: None
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*
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* Side Effects: None
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*
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* Overview: LCD is intialized
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*
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* Note: This function will work with all Hitachi HD447780
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* LCD controller.
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********************************************************************/
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void XLCDInit(void)
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{
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// The data bits must be either a 8-bit port or the upper or
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// lower 4-bits of a port. These pins are made into inputs
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#ifdef BIT8 // 8-bit mode, use whole port
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DATA_PORT = 0;
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TRIS_DATA_PORT = 0xff;
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#else // 4-bit mode
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#ifdef UPPER // Upper 4-bits of the port
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DATA_PORT &= 0x0f;
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TRIS_DATA_PORT |= 0xf0;
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#else // Lower 4-bits of the port
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DATA_PORT &= 0xf0;
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TRIS_DATA_PORT |= 0x0f;
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#endif
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#endif
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TRIS_RW = 0; // All control signals made outputs
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TRIS_RS = 0;
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TRIS_E = 0;
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RW_PIN = 0; // R/W pin made low
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RS_PIN = 0; // Register select pin made low
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E_PIN = 0; // Clock pin made low
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// Delay for 15ms to allow for LCD Power on reset
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XLCDDelay15ms();
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// Setup interface to LCD
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#ifdef BIT8 // 8-bit mode interface
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TRIS_DATA_PORT = 0; // Data port output
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DATA_PORT = 0b00110000; // Function set cmd(8-bit interface)
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#else // 4-bit mode interface
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#ifdef UPPER // Upper nibble interface
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TRIS_DATA_PORT &= 0x0f;
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DATA_PORT &= 0x0f;
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DATA_PORT |= 0b00100000; // Function set cmd(4-bit interface)
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#else // Lower nibble interface
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TRIS_DATA_PORT &= 0xf0;
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DATA_PORT &= 0xf0;
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DATA_PORT |= 0b00000010; // Function set cmd(4-bit interface)
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#endif
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#endif
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E_PIN = 1; // Clock the cmd in
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XLCDDelay500ns();
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E_PIN = 0;
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// Delay for at least 4.1ms
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XLCDDelay4ms();
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// Setup interface to LCD
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#ifdef BIT8 // 8-bit interface
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DATA_PORT = 0b00110000; // Function set cmd(8-bit interface)
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#else // 4-bit interface
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#ifdef UPPER // Upper nibble interface
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DATA_PORT &= 0x0f; // Function set cmd(4-bit interface)
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DATA_PORT |= 0b00100000;
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#else // Lower nibble interface
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DATA_PORT &= 0xf0; // Function set cmd(4-bit interface)
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DATA_PORT |= 0b00000010;
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#endif
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#endif
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E_PIN = 1; // Clock the cmd in
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XLCDDelay500ns();
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E_PIN = 0;
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// Delay for at least 100us
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XLCDDelay100us();
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#if 1
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#ifdef BIT8
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DATA_PORT = 0b00110000; // Function set cmd(8-bit interface)
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#else
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#ifndef BIT8
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#ifdef UPPER // Upper nibble interface
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DATA_PORT &= 0x0f; // Function set cmd(4-bit interface)
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DATA_PORT |= 0b00100000;
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#else // Lower nibble interface
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DATA_PORT &= 0xf0; // Function set cmd(4-bit interface)
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DATA_PORT |= 0b00000010;
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#endif
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E_PIN = 1; // Clock cmd in
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XLCDDelay500ns();
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E_PIN = 0;
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#endif
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#endif
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#endif
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#ifdef BIT8 // 8-bit interface
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TRIS_DATA_PORT = 0xff; // Make data port input
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#else // 4-bit interface
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#ifdef UPPER // Upper nibble interface
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TRIS_DATA_PORT |= 0xf0; // Make data nibble input
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#else // Lower nibble interface
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TRIS_DATA_PORT |= 0x0f; // Make data nibble input
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#endif
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#endif
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// Set data interface width, # lines, font
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#if !defined(XLCD_IS_BLOCKING)
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while(XLCDIsBusy()); // Wait if LCD busy
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#endif
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XLCDCommand(XCLD_TYPE); // Function set cmd
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// Set DD Ram address to 0
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#if !defined(XLCD_IS_BLOCKING)
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while(XLCDIsBusy()); // Wait if LCD busy
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#endif
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XLCDCommand(XCLD_TYPE);
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#if !defined(XLCD_IS_BLOCKING)
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while(XLCDIsBusy()); // Wait if LCD busy
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#endif
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XLCDCommand(DOFF&XLCD_DISPLAY_SETUP);
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#if !defined(XLCD_IS_BLOCKING)
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while(XLCDIsBusy()); // Wait if LCD busy
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#endif
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XLCDCommand(DON&XLCD_DISPLAY_SETUP);
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// Clear display
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#if !defined(XLCD_IS_BLOCKING)
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while(XLCDIsBusy()); // Wait if LCD busy
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#endif
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XLCDCommand(0x01); // Clear display
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// Set entry mode inc, no shift
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#if !defined(XLCD_IS_BLOCKING)
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while(XLCDIsBusy()); // Wait if LCD busy
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#endif
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XLCDCommand(SHIFT_CUR_LEFT); // Entry Mode
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// Set DD Ram address to 0
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#if !defined(XLCD_IS_BLOCKING)
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while(XLCDIsBusy()); // Wait if LCD busy
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#endif
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XLCDCommand(0x80);
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return;
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}
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/*********************************************************************
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* Function: void XLCDCommand(unsigned char cmd)
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*
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* PreCondition: XLCDIsBusy() == FALSE if !defined(XLCD_IS_BLOCKING)
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*
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* Input: cmd - Command to be set to LCD.
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*
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* Output: None
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*
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* Side Effects: None
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*
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* Overview: None
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*
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* Note: None
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********************************************************************/
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void XLCDCommand(unsigned char cmd)
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{
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#if defined(XLCD_IS_BLOCKING)
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while(XLCDIsBusy()); // Wait if LCD busy
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#endif
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TRIS_RW = 0; // All control signals made outputs
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TRIS_RS = 0;
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#ifdef BIT8 // 8-bit interface
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TRIS_DATA_PORT = 0; // Data port output
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DATA_PORT = cmd; // Write command to data port
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RW_PIN = 0; // Set the control signals
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RS_PIN = 0; // for sending a command
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XLCDDelay500ns();
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E_PIN = 1; // Clock the command in
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XLCDDelay500ns();
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E_PIN = 0;
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XLCDDelay500ns();
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TRIS_DATA_PORT = 0xff; // Data port input
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#else // 4-bit interface
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#ifdef UPPER // Upper nibble interface
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TRIS_DATA_PORT &= 0x0f;
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DATA_PORT &= 0x0f;
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DATA_PORT |= cmd&0xf0;
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#else // Lower nibble interface
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TRIS_DATA_PORT &= 0xf0;
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DATA_PORT &= 0xf0;
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DATA_PORT |= (cmd>>4);
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#endif
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RW_PIN = 0; // Set control signals for command
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RS_PIN = 0;
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XLCDDelay500ns();
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E_PIN = 1; // Clock command in
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XLCDDelay500ns();
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E_PIN = 0;
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#ifdef UPPER // Upper nibble interface
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DATA_PORT &= 0x0f;
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DATA_PORT |= (cmd<<4)&0xf0;
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#else // Lower nibble interface
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DATA_PORT &= 0xf0;
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DATA_PORT |= cmd&0x0f;
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#endif
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XLCDDelay500ns();
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E_PIN = 1; // Clock command in
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XLCDDelay500ns();
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E_PIN = 0;
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#ifdef UPPER // Make data nibble input
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TRIS_DATA_PORT |= 0xf0;
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#else
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TRIS_DATA_PORT |= 0x0f;
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#endif
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#endif
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return;
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}
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/*********************************************************************
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* Function: char XLCDIsBusy(void)
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*
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* PreCondition: None
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*
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* Input: None
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*
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* Output: non-zero if LCD controller is ready to accept new
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* data or command
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* zero otherwise.
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*
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* Side Effects: None
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*
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* Overview: None
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*
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* Note: None
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********************************************************************/
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char XLCDIsBusy(void)
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{
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#if !defined(XLCD_READ_BACK)
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int i = 0;
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for ( i = 0; i < 500; i++ )
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;
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return 0;
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#endif
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RW_PIN = 1; // Set the control bits for read
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RS_PIN = 0;
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TRIS_RW = 0; // All control signals made outputs
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TRIS_RS = 0;
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XLCDDelay500ns();
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E_PIN = 1; // Clock in the command
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XLCDDelay500ns();
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#ifdef BIT8 // 8-bit interface
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if(DATA_PORT&0x80) // Read bit 7 (busy bit)
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{ // If high
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E_PIN = 0; // Reset clock line
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RW_PIN = 0; // Reset control line
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return 1; // Return TRUE
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}
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else // Bit 7 low
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{
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E_PIN = 0; // Reset clock line
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RW_PIN = 0; // Reset control line
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return 0; // Return FALSE
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}
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#else // 4-bit interface
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#ifdef UPPER // Upper nibble interface
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if(DATA_PORT&0x80)
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#else // Lower nibble interface
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if(DATA_PORT&0x08)
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#endif
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{
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E_PIN = 0; // Reset clock line
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XLCDDelay500ns();
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E_PIN = 1; // Clock out other nibble
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XLCDDelay500ns();
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E_PIN = 0;
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RW_PIN = 0; // Reset control line
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return 1; // Return TRUE
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}
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else // Busy bit is low
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{
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E_PIN = 0; // Reset clock line
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XLCDDelay500ns();
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E_PIN = 1; // Clock out other nibble
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XLCDDelay500ns();
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E_PIN = 0;
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RW_PIN = 0; // Reset control line
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return 0; // Return FALSE
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}
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#endif
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}
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/*********************************************************************
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* Function: unsigned char XLCDGetAddr(void)
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*
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* PreCondition: XLCDIsBusy() == FALSE && !defined(XLCD_IS_BLOCKING)
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*
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* Input: None
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*
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* Output: Current address byte from LCD
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*
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* Side Effects: None
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*
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* Overview: None
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*
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* Note: The address is read from the character generator
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* RAM or display RAM depending on current setup.
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********************************************************************/
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#if defined(XLCD_ENABLE_LCD_READS)
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unsigned char XLCDGetAddr(void)
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{
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char data; // Holds the data retrieved from the LCD
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TRIS_RW = 0; // All control signals made outputs
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TRIS_RS = 0;
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#if defined(XLCD_IS_BLOCKING)
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while(XLCDIsBusy()); // Wait if LCD busy
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#endif
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#ifdef BIT8 // 8-bit interface
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RW_PIN = 1; // Set control bits for the read
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RS_PIN = 0;
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XLCDDelay500ns();
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E_PIN = 1; // Clock data out of the LCD controller
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XLCDDelay500ns();
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data = DATA_PORT; // Save the data in the register
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E_PIN = 0;
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RW_PIN = 0; // Reset the control bits
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#else // 4-bit interface
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RW_PIN = 1; // Set control bits for the read
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RS_PIN = 0;
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XLCDDelay500ns();
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E_PIN = 1; // Clock data out of the LCD controller
|
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XLCDDelay500ns();
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#ifdef UPPER // Upper nibble interface
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data = DATA_PORT&0xf0; // Read the nibble into the upper nibble of data
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| 406 |
#else // Lower nibble interface
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data = (DATA_PORT<<4)&0xf0; // Read the nibble into the upper nibble of data
|
| 408 |
#endif
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E_PIN = 0; // Reset the clock
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XLCDDelay500ns();
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E_PIN = 1; // Clock out the lower nibble
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XLCDDelay500ns();
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| 413 |
#ifdef UPPER // Upper nibble interface
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data |= (DATA_PORT>>4)&0x0f; // Read the nibble into the lower nibble of data
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| 415 |
#else // Lower nibble interface
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data |= DATA_PORT&0x0f; // Read the nibble into the lower nibble of data
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| 417 |
#endif
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E_PIN = 0;
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| 419 |
RW_PIN = 0; // Reset the control lines
|
| 420 |
#endif
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| 421 |
return (data&0x7f); // Return the address, Mask off the busy bit
|
| 422 |
}
|
| 423 |
#endif
|
| 424 |
|
| 425 |
/*********************************************************************
|
| 426 |
* Function: char XLCDGet(void)
|
| 427 |
*
|
| 428 |
* PreCondition: XLCDIsBusy() == FALSE && !defined(XLCD_IS_BLOCKING)
|
| 429 |
*
|
| 430 |
* Input: None
|
| 431 |
*
|
| 432 |
* Output: Current data byte from LCD
|
| 433 |
*
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| 434 |
* Side Effects: None
|
| 435 |
*
|
| 436 |
* Overview: None
|
| 437 |
*
|
| 438 |
* Note: The data is read from the character generator
|
| 439 |
* RAM or display RAM depending on current setup.
|
| 440 |
********************************************************************/
|
| 441 |
#if defined(XLCD_ENABLE_LCD_READS)
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char XLCDGet(void)
|
| 443 |
{
|
| 444 |
char data;
|
| 445 |
|
| 446 |
TRIS_RW = 0; // All control signals made outputs
|
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TRIS_RS = 0;
|
| 448 |
|
| 449 |
#if defined(XLCD_IS_BLOCKING)
|
| 450 |
while(XLCDIsBusy()); // Wait if LCD busy
|
| 451 |
#endif
|
| 452 |
|
| 453 |
#ifdef BIT8 // 8-bit interface
|
| 454 |
RS_PIN = 1; // Set the control bits
|
| 455 |
RW_PIN = 1;
|
| 456 |
XLCDDelay500ns();
|
| 457 |
E_PIN = 1; // Clock the data out of the LCD
|
| 458 |
XLCDDelay500ns();
|
| 459 |
data = DATA_PORT; // Read the data
|
| 460 |
E_PIN = 0;
|
| 461 |
RS_PIN = 0; // Reset the control bits
|
| 462 |
RW_PIN = 0;
|
| 463 |
#else // 4-bit interface
|
| 464 |
RW_PIN = 1;
|
| 465 |
RS_PIN = 1;
|
| 466 |
XLCDDelay500ns();
|
| 467 |
E_PIN = 1; // Clock the data out of the LCD
|
| 468 |
XLCDDelay500ns();
|
| 469 |
#ifdef UPPER // Upper nibble interface
|
| 470 |
data = DATA_PORT&0xf0; // Read the upper nibble of data
|
| 471 |
#else // Lower nibble interface
|
| 472 |
data = (DATA_PORT<<4)&0xf0; // read the upper nibble of data
|
| 473 |
#endif
|
| 474 |
E_PIN = 0; // Reset the clock line
|
| 475 |
XLCDDelay500ns();
|
| 476 |
E_PIN = 1; // Clock the next nibble out of the LCD
|
| 477 |
XLCDDelay500ns();
|
| 478 |
#ifdef UPPER // Upper nibble interface
|
| 479 |
data |= (DATA_PORT>>4)&0x0f; // Read the lower nibble of data
|
| 480 |
#else // Lower nibble interface
|
| 481 |
data |= DATA_PORT&0x0f; // Read the lower nibble of data
|
| 482 |
#endif
|
| 483 |
E_PIN = 0;
|
| 484 |
RS_PIN = 0; // Reset the control bits
|
| 485 |
RW_PIN = 0;
|
| 486 |
#endif
|
| 487 |
return(data); // Return the data byte
|
| 488 |
}
|
| 489 |
#endif
|
| 490 |
|
| 491 |
|
| 492 |
void XLCDPutString(char *string)
|
| 493 |
{
|
| 494 |
char v;
|
| 495 |
|
| 496 |
while( v = *string )
|
| 497 |
{
|
| 498 |
#if !defined(XLCD_IS_BLOCKING)
|
| 499 |
while(XLCDIsBusy()); // Wait if LCD busy
|
| 500 |
#endif
|
| 501 |
XLCDPut(v);
|
| 502 |
string++;
|
| 503 |
}
|
| 504 |
}
|
| 505 |
|
| 506 |
void XLCDPutROMString(ROM char *string)
|
| 507 |
{
|
| 508 |
char v;
|
| 509 |
|
| 510 |
while( v = *string )
|
| 511 |
{
|
| 512 |
#if !defined(XLCD_IS_BLOCKING)
|
| 513 |
while(XLCDIsBusy()); // Wait if LCD busy
|
| 514 |
#endif
|
| 515 |
XLCDPut(v);
|
| 516 |
string++;
|
| 517 |
}
|
| 518 |
}
|
| 519 |
|
| 520 |
|
| 521 |
/*********************************************************************
|
| 522 |
* Function: void XLCDPut(char data)
|
| 523 |
*
|
| 524 |
* PreCondition: XLCDInit() is already called AND
|
| 525 |
* (XLCDIsBusy() == FALSE AND !defined(XLCD_IS_BLOCKING)
|
| 526 |
*
|
| 527 |
* Input: data - Data to be written
|
| 528 |
*
|
| 529 |
* Output: None
|
| 530 |
*
|
| 531 |
* Side Effects: None
|
| 532 |
*
|
| 533 |
* Overview: None
|
| 534 |
*
|
| 535 |
* Note: Data is written to character generator RAM or
|
| 536 |
* display data RAM depending on how the access is
|
| 537 |
* setup.
|
| 538 |
********************************************************************/
|
| 539 |
void XLCDPut(char data)
|
| 540 |
{
|
| 541 |
#if defined(XLCD_IS_BLOCKING)
|
| 542 |
while(XLCDIsBusy()); // Wait if LCD busy
|
| 543 |
#endif
|
| 544 |
|
| 545 |
TRIS_RW = 0; // All control signals made outputs
|
| 546 |
TRIS_RS = 0;
|
| 547 |
|
| 548 |
#ifdef BIT8 // 8-bit interface
|
| 549 |
TRIS_DATA_PORT = 0; // Make port output
|
| 550 |
DATA_PORT = data; // Write data to port
|
| 551 |
RS_PIN = 1; // Set control bits
|
| 552 |
RW_PIN = 0;
|
| 553 |
XLCDDelay500ns();
|
| 554 |
E_PIN = 1; // Clock data into LCD
|
| 555 |
XLCDDelay500ns();
|
| 556 |
E_PIN = 0;
|
| 557 |
RS_PIN = 0; // Reset control bits
|
| 558 |
TRIS_DATA_PORT = 0xff; // Make port input
|
| 559 |
#else // 4-bit interface
|
| 560 |
#ifdef UPPER // Upper nibble interface
|
| 561 |
TRIS_DATA_PORT &= 0x0f;
|
| 562 |
DATA_PORT &= 0x0f;
|
| 563 |
DATA_PORT |= data&0xf0;
|
| 564 |
#else // Lower nibble interface
|
| 565 |
TRIS_DATA_PORT &= 0xf0;
|
| 566 |
DATA_PORT &= 0xf0;
|
| 567 |
DATA_PORT |= ((data>>4)&0x0f);
|
| 568 |
#endif
|
| 569 |
RS_PIN = 1; // Set control bits
|
| 570 |
RW_PIN = 0;
|
| 571 |
XLCDDelay500ns();
|
| 572 |
E_PIN = 1; // Clock nibble into LCD
|
| 573 |
XLCDDelay500ns();
|
| 574 |
E_PIN = 0;
|
| 575 |
#ifdef UPPER // Upper nibble interface
|
| 576 |
DATA_PORT &= 0x0f;
|
| 577 |
DATA_PORT |= ((data<<4)&0xf0);
|
| 578 |
#else // Lower nibble interface
|
| 579 |
DATA_PORT &= 0xf0;
|
| 580 |
DATA_PORT |= (data&0x0f);
|
| 581 |
#endif
|
| 582 |
XLCDDelay500ns();
|
| 583 |
E_PIN = 1; // Clock nibble into LCD
|
| 584 |
XLCDDelay500ns();
|
| 585 |
E_PIN = 0;
|
| 586 |
#ifdef UPPER // Upper nibble interface
|
| 587 |
TRIS_DATA_PORT |= 0xf0;
|
| 588 |
#else // Lower nibble interface
|
| 589 |
TRIS_DATA_PORT |= 0x0f;
|
| 590 |
#endif
|
| 591 |
#endif
|
| 592 |
return;
|
| 593 |
}
|
| 594 |
|
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