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eeprom.c (161193) eeprom.c (165399)
1/******************************************************************************
2 *
3 * Filename: eeprom.c
4 *
5 * Instantiation of eeprom routines
6 *
7 * Revision information:
8 *

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13 * No warranty, expressed or implied, is included with this software. It is
14 * provided "AS IS" and no warranty of any kind including statutory or aspects
15 * relating to merchantability or fitness for any purpose is provided. All
16 * intellectual property rights of others is maintained with the respective
17 * owners. This software is not copyrighted and is intended for reference
18 * only.
19 * END_BLOCK
20 *
1/******************************************************************************
2 *
3 * Filename: eeprom.c
4 *
5 * Instantiation of eeprom routines
6 *
7 * Revision information:
8 *

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13 * No warranty, expressed or implied, is included with this software. It is
14 * provided "AS IS" and no warranty of any kind including statutory or aspects
15 * relating to merchantability or fitness for any purpose is provided. All
16 * intellectual property rights of others is maintained with the respective
17 * owners. This software is not copyrighted and is intended for reference
18 * only.
19 * END_BLOCK
20 *
21 * $FreeBSD: head/sys/boot/arm/at91/libat91/eeprom.c 161193 2006-08-10 18:03:50Z imp $
21 * $FreeBSD: head/sys/boot/arm/at91/libat91/eeprom.c 165399 2006-12-20 18:19:52Z imp $
22 *****************************************************************************/
23
24#include "at91rm9200_lowlevel.h"
25#include "at91rm9200.h"
26#include "lib.h"
27
28/******************************* GLOBALS *************************************/
29

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77/*
78 * .KB_C_FN_DEFINITION_START
79 * void ReadEEPROM(unsigned ee_addr, char *data_addr, unsigned size)
80 * This global function reads data from the eeprom at ee_addr storing data
81 * to data_addr for size bytes. Assume the TWI has been initialized.
82 * This function does not utilize the page read mode to simplify the code.
83 * .KB_C_FN_DEFINITION_END
84 */
22 *****************************************************************************/
23
24#include "at91rm9200_lowlevel.h"
25#include "at91rm9200.h"
26#include "lib.h"
27
28/******************************* GLOBALS *************************************/
29

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77/*
78 * .KB_C_FN_DEFINITION_START
79 * void ReadEEPROM(unsigned ee_addr, char *data_addr, unsigned size)
80 * This global function reads data from the eeprom at ee_addr storing data
81 * to data_addr for size bytes. Assume the TWI has been initialized.
82 * This function does not utilize the page read mode to simplify the code.
83 * .KB_C_FN_DEFINITION_END
84 */
85void
85int
86ReadEEPROM(unsigned ee_off, char *data_addr, unsigned size)
87{
88 const AT91PS_TWI twiPtr = AT91C_BASE_TWI;
89 unsigned int status;
86ReadEEPROM(unsigned ee_off, char *data_addr, unsigned size)
87{
88 const AT91PS_TWI twiPtr = AT91C_BASE_TWI;
89 unsigned int status;
90 unsigned int count;
90
91 status = twiPtr->TWI_SR;
92 status = twiPtr->TWI_RHR;
93
94 // Set the TWI Master Mode Register
95 twiPtr->TWI_MMR = (TWSI_EEPROM_ADDRESS << 16) |
96 AT91C_TWI_IADRSZ_2_BYTE | AT91C_TWI_MREAD;
97
98 // Set TWI Internal Address Register
99 twiPtr->TWI_IADR = ee_off;
100
101 // Start transfer
102 twiPtr->TWI_CR = AT91C_TWI_START;
103
104 status = twiPtr->TWI_SR;
105
106 while (size-- > 1){
91
92 status = twiPtr->TWI_SR;
93 status = twiPtr->TWI_RHR;
94
95 // Set the TWI Master Mode Register
96 twiPtr->TWI_MMR = (TWSI_EEPROM_ADDRESS << 16) |
97 AT91C_TWI_IADRSZ_2_BYTE | AT91C_TWI_MREAD;
98
99 // Set TWI Internal Address Register
100 twiPtr->TWI_IADR = ee_off;
101
102 // Start transfer
103 twiPtr->TWI_CR = AT91C_TWI_START;
104
105 status = twiPtr->TWI_SR;
106
107 while (size-- > 1){
107
108 // Wait RHR Holding register is full
108 // Wait RHR Holding register is full
109 while (!(twiPtr->TWI_SR & AT91C_TWI_RXRDY))
109 count = 1000000;
110 while (!(twiPtr->TWI_SR & AT91C_TWI_RXRDY) && --count > 0)
110 continue;
111 continue;
112 if (count <= 0)
113 return -1;
111
112 // Read byte
113 *(data_addr++) = twiPtr->TWI_RHR;
114 }
115
116 twiPtr->TWI_CR = AT91C_TWI_STOP;
117
118 status = twiPtr->TWI_SR;
119
120 // Wait transfer is finished
121 while (!(twiPtr->TWI_SR & AT91C_TWI_TXCOMP))
122 continue;
123
124 // Read last byte
125 *data_addr = twiPtr->TWI_RHR;
114
115 // Read byte
116 *(data_addr++) = twiPtr->TWI_RHR;
117 }
118
119 twiPtr->TWI_CR = AT91C_TWI_STOP;
120
121 status = twiPtr->TWI_SR;
122
123 // Wait transfer is finished
124 while (!(twiPtr->TWI_SR & AT91C_TWI_TXCOMP))
125 continue;
126
127 // Read last byte
128 *data_addr = twiPtr->TWI_RHR;
129 return 0;
126}
127
128
129/*
130 * .KB_C_FN_DEFINITION_START
131 * void WriteEEPROM(unsigned ee_off, char *data_addr, unsigned size)
132 * This global function writes data to the eeprom at ee_off using data
133 * from data_addr for size bytes. Assume the TWI has been initialized.

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131
132
133/*
134 * .KB_C_FN_DEFINITION_START
135 * void WriteEEPROM(unsigned ee_off, char *data_addr, unsigned size)
136 * This global function writes data to the eeprom at ee_off using data
137 * from data_addr for size bytes. Assume the TWI has been initialized.

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