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
|
/*
* Copyright © 2012 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao.h>
#if HAS_EEPROM
#define AO_AT24C_ADDR 0xa0
#define AO_AT24C_ADDR_WRITE (AO_AT24C_ADDR|0)
#define AO_AT24C_ADDR_READ (AO_AT24C_ADDR|1)
#define AO_AT24C_PAGE_LEN 128
/* Total bytes of available storage */
__pdata ao_pos_t ao_storage_total = 64l * 1024l;
/* Storage unit size - device reads and writes must be within blocks of this size. */
__pdata uint16_t ao_storage_unit = 128;
static void
ao_at24c_set_address(uint8_t addr, ao_pos_t pos)
{
uint8_t a[2];
a[0] = pos >> 8;
a[1] = pos;
ao_i2c_start_bus(addr);
ao_i2c_send_bus(a, 2, 0);
}
/*
* Erase the specified sector
*/
uint8_t
ao_storage_erase(ao_pos_t pos) __reentrant
{
if (pos >= ao_storage_total || pos + AO_AT24C_PAGE_LEN > ao_storage_total)
return 0;
ao_mutex_get(&ao_at24c_mutex);
ao_at24c_set_address(AO_AT24C_ADDR_WRITE, pos);
ao_i2c_send_fixed_bus(0xff, AO_AT24C_PAGE_LEN, 1);
ao_mutex_put(&ao_at24c_mutex);
return 1;
}
/*
* Write to flash
*/
uint8_t
ao_storage_device_write(ao_pos_t pos, __xdata void *d, uint16_t len) __reentrant
{
if (pos >= ao_storage_total || pos + len > ao_storage_total)
return 0;
ao_mutex_get(&ao_m25_mutex);
ao_at24c_set_address(AO_AT24C_ADDR_WRITE, pos);
ao_i2c_send_bus(d, len, 1);
ao_mutex_put(&ao_m25_mutex);
return 1;
}
/*
* Read from flash
*/
uint8_t
ao_storage_device_read(ao_pos_t pos, __xdata void *d, uint16_t len) __reentrant
{
if (pos >= ao_storage_total || pos + len > ao_storage_total)
return 0;
ao_mutex_get(&ao_m25_mutex);
ao_at24c_set_address(AO_AT24C_ADDR_READ, pos);
ao_i2c_recv_bus(d, len, 1);
ao_mutex_put(&ao_m25_mutex);
return 1;
}
void
ao_storage_flush(void) __reentrant
{
}
void
ao_storage_setup(void)
{
}
void
ao_storage_device_init(void)
{
}
#endif
|
