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
|
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Mark Shannon
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include <stdio.h>
#include "py/nlr.h"
#include "py/obj.h"
#include "py/gc.h"
#include "microbit/filesystem.h"
#include "lib/ticker.h"
#define DEBUG_PERSISTENT 0
#if DEBUG_PERSISTENT
#define DEBUG(s) printf s
#else
#define DEBUG(s) (void)0
#endif
void persistent_write_byte_unchecked(const uint8_t *dest, const uint8_t val) {
#if DEBUG_PERSISTENT
if (((~(*dest)) & val) != 0) {
DEBUG(("PERSISTENCE DEBUG: ERROR: Unchecked write of byte %u to %lx which contains %u\r\n", val, (uint32_t)dest, *dest));
mp_raise_msg(&mp_type_Exception, "Internal error: Attempting illegal write.");
}
#endif
DEBUG(("PERSISTENCE DEBUG: Write unchecked byte %u to %lx, previous value %u\r\n", val, (uint32_t)dest, *dest));
// Writing to flash will stop the CPU, so we stop the ticker to minimise odd behaviour.
ticker_stop();
nrf_nvmc_write_byte((uint32_t)dest, val);
ticker_start();
}
void persistent_write_unchecked(const void *dest, const void *src, uint32_t len) {
DEBUG(("PERSISTENCE DEBUG: Write unchecked %lu bytes from %lx to %lx\r\n", len, (uint32_t)src, (uint32_t)dest));
int8_t *address = (int8_t *)dest;
int8_t *data = (int8_t *)src;
#if DEBUG_PERSISTENT
for(uint32_t i = 0; i < len; i++) {
if ((~address[i] & data[i]) != 0) {
DEBUG(("PERSISTENCE DEBUG: ERROR: Unchecked write of byte %u to %lx which contains %u\r\n", data[i], (uint32_t)&address[i], address[i]));
mp_raise_msg(&mp_type_Exception, "Internal error: Attempting illegal write.");
}
}
#endif
// Writing to flash will stop the CPU, so we stop the ticker to minimise odd behaviour.
ticker_stop();
// Aligned word writes are over 4 times as fast per byte, so use those if we can.
if ((((uint32_t)address) & 3) == 0 && (((uint32_t)data) & 3) == 0 && len >= 4) {
nrf_nvmc_write_words((uint32_t)address, (const uint32_t *)data, len>>2);
address += (len>>2)<<2;
data += (len>>2)<<2;
len &= 3;
}
if (len) {
nrf_nvmc_write_bytes((uint32_t)address, (const uint8_t *)data, len);
}
while (NRF_NVMC->READY == NVMC_READY_READY_Busy);
ticker_start();
}
static inline bool can_write(const int8_t *dest, const int8_t *src, uint32_t len) {
const int8_t *end = dest + len;
while (dest < end) {
if (((~(*dest)) & *src) != 0) {
DEBUG(("PERSISTENCE DEBUG: %lu bytes from %lx need to be erased\r\n", len, (uint32_t)dest));
return false;
}
dest++;
src++;
}
DEBUG(("PERSISTENCE DEBUG: %lu bytes from %lx do not need to be erased\r\n", len, (uint32_t)dest));
return true;
}
void persistent_erase_page(const void *page) {
DEBUG(("PERSISTENCE DEBUG: Erasing page %lx\r\n", (uint32_t)page));
// Writing to flash will stop the CPU, so we stop the ticker to minimise odd behaviour.
ticker_stop();
nrf_nvmc_page_erase((uint32_t)page);
ticker_start();
}
bool is_persistent_page_aligned(const void *ptr) {
return (((uint32_t)ptr) & (persistent_page_size()-1)) == 0;
}
int persistent_write(const void *dst, const void *src, uint32_t len) {
DEBUG(("PERSISTENCE DEBUG: Write persistent %lu bytes from %lx to %lx\r\n", len, (uint32_t)src, (uint32_t)dst));
const int8_t *dest = dst;
const int8_t *addr = src;
const int8_t *end_data = src+len;
const uint32_t page_size = persistent_page_size();
int8_t *page = (void *)(((uint32_t)dest)&(-page_size));
int8_t *tmp_storage = NULL;
while (addr < end_data) {
int8_t *next_page = page + page_size;
uint32_t data_in_page = min(end_data-addr, next_page-dest);
if (can_write(dest, addr, data_in_page)) {
persistent_write_unchecked(dest, addr, data_in_page);
} else {
if (tmp_storage == NULL) {
tmp_storage = m_new(int8_t, page_size);
if (tmp_storage == NULL) {
return -1;
}
}
memcpy(tmp_storage, page, page_size);
memcpy(tmp_storage+(dest-page), addr, data_in_page);
persistent_erase_page(page);
persistent_write_unchecked(page, tmp_storage, page_size);
}
dest = page = next_page;
addr += data_in_page;
}
if (tmp_storage) {
gc_free(tmp_storage);
}
return 0;
}
int persistent_write_byte(const uint8_t *dest, const uint8_t val) {
DEBUG(("PERSISTENCE DEBUG: Write persistent byte %u to %lx\r\n", val, (uint32_t)dest));
if (((~(*dest)) & val) == 0) {
// Writing to flash will stop the CPU, so we stop the ticker to minimise odd behaviour.
ticker_stop();
nrf_nvmc_write_byte((uint32_t)dest, val);
ticker_start();
return 0;
} else {
return persistent_write(dest, &val, 1);
}
}
|
