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
|
/*
* MIT License
*
* Copyright (c) 2022 Joey Castillo
*
* Ported from MIT-licensed code from CircuitPython
* Copyright (c) 2016, 2017 Scott Shawcroft for Adafruit Industries
*
*
* 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 "spiflash.h"
#define SPI_FLASH_FAST_READ false
static void flash_enable(void) {
watch_set_pin_level(A3, false);
}
static void flash_disable(void) {
watch_set_pin_level(A3, true);
}
static bool transfer(uint8_t *command, uint32_t command_length, uint8_t *data_in, uint8_t *data_out, uint32_t data_length) {
bool status = watch_spi_write(command, command_length);
if (status) {
if (data_in != NULL && data_out != NULL) {
status = watch_spi_transfer(data_out, data_in, data_length);
} else if (data_out != NULL) {
status = watch_spi_read(data_out, data_length);
} else if (data_in != NULL) {
status = watch_spi_write(data_in, data_length);
}
}
flash_disable();
return status;
}
static bool transfer_command(uint8_t command, uint8_t *data_in, uint8_t *data_out, uint32_t data_length) {
return transfer(&command, 1, data_in, data_out, data_length);
}
bool spi_flash_command(uint8_t command) {
return transfer_command(command, NULL, NULL, 0);
}
bool spi_flash_read_command(uint8_t command, uint8_t *data, uint32_t data_length) {
return transfer_command(command, NULL, data, data_length);
}
bool spi_flash_write_command(uint8_t command, uint8_t *data, uint32_t data_length) {
return transfer_command(command, data, NULL, data_length);
}
// Pack the low 24 bits of the address into a uint8_t array.
static void address_to_bytes(uint32_t address, uint8_t *bytes) {
bytes[0] = (address >> 16) & 0xff;
bytes[1] = (address >> 8) & 0xff;
bytes[2] = address & 0xff;
}
bool spi_flash_sector_command(uint8_t command, uint32_t address) {
uint8_t request[4] = {command, 0x00, 0x00, 0x00};
address_to_bytes(address, request + 1);
return transfer(request, 4, NULL, NULL, 0);
}
bool spi_flash_write_data(uint32_t address, uint8_t *data, uint32_t data_length) {
uint8_t request[4] = {CMD_PAGE_PROGRAM, 0x00, 0x00, 0x00};
// Write the SPI flash write address into the bytes following the command byte.
address_to_bytes(address, request + 1);
flash_enable();
bool status = watch_spi_write(request, 4);
if (status) {
status = watch_spi_write(data, data_length);
}
flash_disable();
return status;
}
bool spi_flash_read_data(uint32_t address, uint8_t *data, uint32_t data_length) {
uint8_t request[5] = {CMD_READ_DATA, 0x00, 0x00, 0x00};
uint8_t command_length = 4;
if (SPI_FLASH_FAST_READ) {
request[0] = CMD_FAST_READ_DATA;
command_length = 5;
}
// Write the SPI flash read address into the bytes following the command byte.
address_to_bytes(address, request + 1);
flash_enable();
bool status = watch_spi_write(request, command_length);
if (status) {
status = watch_spi_read(data, data_length);
}
flash_disable();
return status;
}
void spi_flash_init(void) {
gpio_set_pin_level(A3, true);
gpio_set_pin_direction(A3, GPIO_DIRECTION_OUT);
watch_enable_spi();
}
|
