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eeprom.c (157873) eeprom.c (161193)
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 157873 2006-04-19 17:16:49Z imp $
21 * $FreeBSD: head/sys/boot/arm/at91/libat91/eeprom.c 161193 2006-08-10 18:03:50Z imp $
22 *****************************************************************************/
23
24#include "at91rm9200_lowlevel.h"
25#include "at91rm9200.h"
26#include "lib.h"
27
28/******************************* GLOBALS *************************************/
29

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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
22 *****************************************************************************/
23
24#include "at91rm9200_lowlevel.h"
25#include "at91rm9200.h"
26#include "lib.h"
27
28/******************************* GLOBALS *************************************/
29

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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
86ReadEEPROM(unsigned ee_addr, char *data_addr, unsigned size)
86ReadEEPROM(unsigned ee_off, char *data_addr, unsigned size)
87{
88 const AT91PS_TWI twiPtr = AT91C_BASE_TWI;
89 unsigned int status;
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
87{
88 const AT91PS_TWI twiPtr = AT91C_BASE_TWI;
89 unsigned int status;
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_addr;
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){
107

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123
124 // Read last byte
125 *data_addr = twiPtr->TWI_RHR;
126}
127
128
129/*
130 * .KB_C_FN_DEFINITION_START
100
101 // Start transfer
102 twiPtr->TWI_CR = AT91C_TWI_START;
103
104 status = twiPtr->TWI_SR;
105
106 while (size-- > 1){
107

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123
124 // Read last byte
125 *data_addr = twiPtr->TWI_RHR;
126}
127
128
129/*
130 * .KB_C_FN_DEFINITION_START
131 * void WriteEEPROM(unsigned ee_addr, char *data_addr, unsigned size)
132 * This global function writes data to the eeprom at ee_addr using data
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.
134 * This function does not utilize the page write mode as the write time is
135 * much greater than the time required to access the device for byte-write
136 * functionality. This allows the function to be much simpler.
137 * .KB_C_FN_DEFINITION_END
138 */
139void
133 * from data_addr for size bytes. Assume the TWI has been initialized.
134 * This function does not utilize the page write mode as the write time is
135 * much greater than the time required to access the device for byte-write
136 * functionality. This allows the function to be much simpler.
137 * .KB_C_FN_DEFINITION_END
138 */
139void
140WriteEEPROM(unsigned ee_addr, char *data_addr, unsigned size)
140WriteEEPROM(unsigned ee_off, char *data_addr, unsigned size)
141{
142 const AT91PS_TWI twiPtr = AT91C_BASE_TWI;
143 unsigned status;
144 char test_data;
145
146 while (size--) {
141{
142 const AT91PS_TWI twiPtr = AT91C_BASE_TWI;
143 unsigned status;
144 char test_data;
145
146 while (size--) {
147 if (!(ee_addr & 0x3f))
147 if (!(ee_off & 0x3f))
148 putchar('.');
149
150 // Set the TWI Master Mode Register
151 twiPtr->TWI_MMR = ((TWSI_EEPROM_ADDRESS << 16) |
152 AT91C_TWI_IADRSZ_2_BYTE) & ~AT91C_TWI_MREAD;
153
154 // Set TWI Internal Address Register
148 putchar('.');
149
150 // Set the TWI Master Mode Register
151 twiPtr->TWI_MMR = ((TWSI_EEPROM_ADDRESS << 16) |
152 AT91C_TWI_IADRSZ_2_BYTE) & ~AT91C_TWI_MREAD;
153
154 // Set TWI Internal Address Register
155 twiPtr->TWI_IADR = ee_addr++;
155 twiPtr->TWI_IADR = ee_off++;
156
157 status = twiPtr->TWI_SR;
158
159 twiPtr->TWI_THR = *(data_addr++);
160
161 twiPtr->TWI_CR = AT91C_TWI_START;
162
163 // Wait transfer is finished

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168
169 status = twiPtr->TWI_SR;
170
171 // Wait transfer is finished
172 while (!(twiPtr->TWI_SR & AT91C_TWI_TXCOMP))
173 continue;
174
175 // wait for write operation to complete
156
157 status = twiPtr->TWI_SR;
158
159 twiPtr->TWI_THR = *(data_addr++);
160
161 twiPtr->TWI_CR = AT91C_TWI_START;
162
163 // Wait transfer is finished

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168
169 status = twiPtr->TWI_SR;
170
171 // Wait transfer is finished
172 while (!(twiPtr->TWI_SR & AT91C_TWI_TXCOMP))
173 continue;
174
175 // wait for write operation to complete
176 ReadEEPROM(ee_addr, &test_data, 1);
176 ReadEEPROM(ee_off, &test_data, 1);
177 }
178
179 putchar('\r');
180 putchar('\n');
181}
177 }
178
179 putchar('\r');
180 putchar('\n');
181}