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/*********************************************************************
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*
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* External serial data EEPROM Access Defs.
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*
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*********************************************************************
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* FileName: xeeprom.h
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* Dependencies: None
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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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*
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* Author Date Comment
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*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* Nilesh Rajbharti 5/20/02 Original (Rev. 1.0)
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********************************************************************/
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#ifndef XEEPROM_H
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#define XEEPROM_H
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#define EE_BAUD(CLOCK, BAUD) ( ((CLOCK / BAUD) / 4) - 1 )
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typedef enum _XEE_RESULT
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{
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XEE_SUCCESS = 0,
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XEE_READY = 0,
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XEE_BUS_COLLISION,
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XEE_NAK,
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XEE_VERIFY_ERR,
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XEE_BUSY
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} XEE_RESULT;
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typedef unsigned short int XEE_ADDR;
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/*********************************************************************
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* Function: void XEEInit(unsigned char baud)
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*
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* PreCondition: None
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*
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* Input: baud - SSPADD value for bit rate.
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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: Initialize I2C module to communicate to serial
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* EEPROM.
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*
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* Note: None
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********************************************************************/
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void XEEInit(unsigned char baud);
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/*********************************************************************
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* Function: XEE_RESULT XEESetAddr(unsigned char control,
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* XEE_ADDR address)
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*
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* PreCondition: XEEInit() is already called.
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*
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* Input: control - data EEPROM control code
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* address - address to be set
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*
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* Output: XEE_SUCCESS if successful
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* other value if failed.
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*
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* Side Effects: None
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*
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* Overview: Modifies internal address counter of EEPROM.
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*
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* Note: This function does not release the I2C bus.
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* User must close XEEClose() after this function
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* is called.
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********************************************************************/
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XEE_RESULT XEESetAddr(unsigned char control, XEE_ADDR address);
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/*********************************************************************
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* Macro: XEE_RESULT XEEBeginWrite(unsigned char control,
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* XEE_ADDR address)
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*
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* PreCondition: XEEInit() is already called.
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*
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* Input: control - data EEPROM control code
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* address - address to where to write
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*
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* Output: XEE_SUCCESS if successful
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* other value if failed.
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*
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* Side Effects: None
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*
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* Overview: Sets up internal address counter of EEPROM.
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*
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* Note: This function does not release the I2C bus.
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* User must close XEEEndWrite() after this function
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* is called to relase the I2C bus.
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********************************************************************/
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#define XEEBeginWrite(control, address) XEESetAddr(control, address)
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/*********************************************************************
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* Function: XEE_RESULT XEEWrite(unsigned char val)
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*
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* PreCondition: XEEInit() && XEEBeginWrite() are already called.
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*
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* Input: val to be written
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*
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* Output: XEE_SUCCESS if successful
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* other value if failed.
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*
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* Side Effects: None
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*
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* Overview: Writes given value 'val' at current address.
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* Current address is set by XEEBeginWrite()
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* and is incremented by every XEEWrite().
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*
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* Note: This function does not initiate the write cycle;
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* it simply loads given value into internal page buffer.
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* This function does not release the I2C bus.
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* User must close XEEEndWrite() after this function
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* is called to relase the I2C bus.
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********************************************************************/
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XEE_RESULT XEEWrite(unsigned char val);
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/*********************************************************************
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* Function: XEE_RESULT XEEEndWrite(void)
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*
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* PreCondition: XEEInit() && XEEBeginWrite() are already called.
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*
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* Input: None
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*
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* Output: XEE_SUCCESS if successful
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* other value if failed.
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*
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* Side Effects: None
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*
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* Overview: Instructs EEPROM to begin write cycle.
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*
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* Note: Call this function after either page full of bytes
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* written or no more bytes are left to load.
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* This function initiates the write cycle.
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* User must call for XEEWait() to ensure that write
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* cycle is finished before calling any other
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* routine.
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********************************************************************/
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XEE_RESULT XEEEndWrite(void);
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/*********************************************************************
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* Function: XEE_RESULT XEEBeginRead(unsigned char control,
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* XEE_ADDR address)
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*
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* PreCondition: XEEInit() is already called.
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*
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* Input: control - EEPROM control and address code.
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* address - Address at which read is to be performed.
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*
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* Output: XEE_SUCCESS if successful
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* other value if failed.
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*
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* Side Effects: None
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*
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* Overview: Sets internal address counter to given address.
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* Puts EEPROM in sequential read mode.
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*
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* Note: This function does not release I2C bus.
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* User must call XEEEndRead() when read is not longer
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* needed; I2C bus will released after XEEEndRead()
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* is called.
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********************************************************************/
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XEE_RESULT XEEBeginRead(unsigned char control, XEE_ADDR address);
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/*********************************************************************
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* Function: XEE_RESULT XEERead(void)
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*
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* PreCondition: XEEInit() && XEEBeginRead() are already called.
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*
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* Input: None
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*
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* Output: XEE_SUCCESS if successful
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* other value if failed.
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*
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* Side Effects: None
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*
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* Overview: Reads next byte from EEPROM; internal address
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* is incremented by one.
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*
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* Note: This function does not release I2C bus.
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* User must call XEEEndRead() when read is not longer
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* needed; I2C bus will released after XEEEndRead()
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* is called.
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********************************************************************/
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unsigned char XEERead(void);
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/*********************************************************************
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* Function: XEE_RESULT XEEEndRead(void)
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*
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* PreCondition: XEEInit() && XEEBeginRead() are already called.
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*
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* Input: None
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*
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* Output: XEE_SUCCESS if successful
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* other value if failed.
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*
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* Side Effects: None
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*
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* Overview: Ends sequential read cycle.
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*
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* Note: This function ends seuential cycle that was in
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* progress. It releases I2C bus.
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********************************************************************/
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XEE_RESULT XEEEndRead(void);
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/*********************************************************************
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* Function: XEE_RESULT XEEReadArray(unsigned char control,
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* XEE_ADDR address,
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* unsigned char *buffer,
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* unsigned char length)
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*
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* PreCondition: XEEInit() is already called.
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*
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* Input: control - EEPROM control and address code.
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* address - Address from where array is to be read
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* buffer - Caller supplied buffer to hold the data
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* length - Number of bytes to read.
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*
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* Output: XEE_SUCCESS if successful
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* other value if failed.
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*
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* Side Effects: None
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*
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* Overview: Reads desired number of bytes in sequential mode.
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* This function performs all necessary steps
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* and releases the bus when finished.
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*
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* Note: None
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********************************************************************/
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XEE_RESULT XEEReadArray(unsigned char control,
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XEE_ADDR address,
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unsigned char *buffer,
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unsigned char length);
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/*********************************************************************
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* Function: XEE_RESULT XEEIsBusy(unsigned char control)
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*
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* PreCondition: XEEInit() is already called.
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*
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* Input: control - EEPROM control and address code.
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*
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* Output: XEE_READY if EEPROM is not busy
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* XEE_BUSY if EEPROM is busy
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* other value if failed.
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*
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* Side Effects: None
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*
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* Overview: Requests ack from EEPROM.
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*
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* Note: None
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********************************************************************/
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XEE_RESULT XEEIsBusy(unsigned char control);
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#endif
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