-
Notifications
You must be signed in to change notification settings - Fork 0
/
nand_flash.c
283 lines (222 loc) · 6.73 KB
/
nand_flash.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
//
// Created by 18716 on 2022/9/25.
//
#include "nand_flash.h"
void nand_init() {
NFCONF &= ~(0x3 << 12);
NFCONF |= (0x1 << 8);
// 关闭软件锁
NFCONT &= ~(0x1 << 12);
NAND_DISABLE_SELECT();
// 使能 nand flash 控制器
NFCONT |= 0x1;
}
void nand_wait_ready() {
while (!(NFSTAT & 0x1));
}
void nand_send_command(unsigned char com) {
NFCCMD = com;
for (int i = 0; i < 10; i++);
}
void nand_send_address(unsigned char address) {
NFADDR = address;
for (int i = 0; i < 10; i++);
}
unsigned char nand_read_data_byte() {
return NFDATA;
}
void nand_read_data(unsigned int address, unsigned char *buf, unsigned int len) {
unsigned int i = 0;
unsigned int page = address / 2048;
unsigned int col = address % 2048;
NAND_ENABLE_SELECT();
while (i < len) {
/* 发出00h命令 */
nand_send_command(0);
/* 发出地址 */
/* col addr */
nand_send_address(col & 0xff);
nand_send_address((col >> 8) & 0xff);
/* row/page addr */
nand_send_address(page & 0xff);
nand_send_address((page >> 8) & 0xff);
nand_send_address((page >> 16) & 0xff);
/* 发出30h命令 */
nand_send_command(0x30);
/* 等待就绪 */
nand_wait_ready();
/* 读数据 */
for (; (col < 2048) && (i < len); col++) {
buf[i++] = nand_read_data_byte();
}
if (i == len)
break;
col = 0;
page++;
}
NAND_DISABLE_SELECT();
}
void nand_display_data(unsigned int address) {
NAND_ENABLE_SELECT();
unsigned int page = address / 2048;
unsigned int col = address & (2048 - 1);
int read_count = 0;
unsigned char buf[16] = {0};
unsigned char buf_count = 0;
while (read_count < 2048) {
nand_send_command(0x00);
nand_send_address(col & 0xff);
nand_send_address((col >> 8) & 0xff);
nand_send_address(page & 0xff);
nand_send_address((page >> 8) & 0xff);
nand_send_address((page >> 16) & 0xff);
nand_send_command(0x30);
nand_wait_ready();
for (; (col < 2048) && (read_count < 2048); col++) {
unsigned char read_data = nand_read_data_byte();
buf[buf_count++] = read_data;
read_count++;
print_hex_byte(read_data);
putchar(' ');
if (!(buf_count % 16)) {
puts(" ");
for (int i = 0; i < 16; i++) {
// 可见字符
if (32 <= buf[i] && buf[i] <= 126) {
putchar(buf[i]);
} else {
// 不可见字符 用 . 表示
putchar('.');
}
}
puts("\r\n");
// 重置计数
buf_count = 0;
}
}
}
NAND_DISABLE_SELECT();
}
void nand_scan_info() {
NAND_ENABLE_SELECT();
// 发送 0x90 命令
nand_send_command(0x90);
// 发送地址 0
nand_send_address(0x0);
// 读取数据
unsigned int maker_code = nand_read_data_byte();
unsigned int device_id = nand_read_data_byte();
unsigned int three_data = nand_read_data_byte();
unsigned int four_data = nand_read_data_byte();
unsigned int five_data = nand_read_data_byte();
NAND_DISABLE_SELECT();
print_data("Maker code = ", maker_code);
print_data("device_id = ", device_id);
print_data("Internal Chip Number = ", 1 << (three_data & 0x3));
print_data_unit("Page size = ", 1 << (four_data & 0x3), " kb");
print_data_unit("Block size = ", 64 << ((four_data >> 4) & 0x3), " kb");
print_data("Plane number = ", 1 << ((five_data >> 2) & 0x3));
print_data_unit("Plane size = ", 64 << ((five_data >> 4) & 0x7), " mb");
}
void nand_erase_block(unsigned int address, unsigned int len) {
if (address % (128 * 1024)) {
puts("Put address error\r\n");
return;
}
NAND_ENABLE_SELECT();
while (len--) {
unsigned int page = address / 2048;
nand_send_command(0x60);
nand_send_address(page & 0xff);
nand_send_address((page >> 8) & 0xff);
nand_send_address((page >> 16) & 0xff);
nand_send_command(0xd0);
nand_wait_ready();
// 查询擦除状态
nand_send_command(0x70);
if (!(nand_read_data_byte() & 0x1)) {
puts("Erase block success!\r\n");
} else {
puts("Erase block error!\r\n");
}
address += 128 * 1024;
}
NAND_DISABLE_SELECT();
}
void nand_send_data_byte(char data) {
NFDATA = data;
}
void nand_page_program(unsigned int address, char *buf, unsigned int len) {
unsigned int page = address / 2048;
unsigned int col = address % 2048;
unsigned int count = 0;
NAND_ENABLE_SELECT();
while (count < len) {
nand_send_command(0x80);
nand_send_address(col & 0xff);
nand_send_address((col >> 8) & 0xff);
nand_send_address(page & 0xff);
nand_send_address((page >> 8) & 0xff);
nand_send_address((page >> 16) & 0xff);
for (; (col < 2048) && (count < len); col++) {
nand_send_data_byte(buf[count++]);
}
nand_send_command(0x10);
nand_wait_ready();
// 查询写入状态
nand_send_command(0x70);
if (!(nand_read_data_byte() & 0x1)) {
puts("Write success!\r\n");
} else {
puts("Write error!\r\n");
}
col = 0;
page++;
}
NAND_DISABLE_SELECT();
}
void nand_display_data_test() {
puts("put read address: ");
unsigned int address = get_uint();
print_hex(address);
puts("\r\n");
nand_display_data(0x20000);
}
void nand_erase_block_test() {
nand_erase_block(0x20000, 1);
}
void nand_page_program_test() {
nand_page_program(0x20000, "Example NAND Flash", 18);
}
void nand_test() {
char quit_flag = 0;
while (!quit_flag) {
puts("[s] Select NAND flash info\r\n");
puts("[r] Read NAND flash \r\n");
puts("[e] Erase block NAND flash \r\n");
puts("[p] Page program NAND flash \r\n");
puts("[q] Quit \r\n");
switch (getchar()) {
case 's':
case 'S':
nand_scan_info();
break;
case 'r':
case 'R':
nand_display_data_test();
break;
case 'e':
case 'E':
nand_erase_block_test();
break;
case 'p':
case 'P':
nand_page_program_test();
break;
case 'q':
case 'Q':
quit_flag = 1;
break;
}
}
}