Outline ![]()
Files ![]()
loading...
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
/* SD card and FAT filesystem example.
This example uses SPI peripheral to communicate with SD card.
This example code is in the Public Domain (or CC0 licensed, at your option.)
Unless required by applicable law or agreed to in writing, this
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.
*/
#include <string.h>
#include <sys/unistd.h>
#include <sys/stat.h>
#include "esp_vfs_fat.h"
#include "sdmmc_cmd.h"
#include "sd_test_io.h"
#if SOC_SDMMC_IO_POWER_EXTERNAL
#include "sd_pwr_ctrl_by_on_chip_ldo.h"
#endif
#define EXAMPLE_MAX_CHAR_SIZE 64
static const char *TAG = "example";
#define MOUNT_POINT "/sdcard"
#ifdef CONFIG_EXAMPLE_DEBUG_PIN_CONNECTIONS
const char* names[] = {"CLK ", "MOSI", "MISO", "CS "};
const int pins[] = {CONFIG_EXAMPLE_PIN_CLK,
CONFIG_EXAMPLE_PIN_MOSI,
CONFIG_EXAMPLE_PIN_MISO,
CONFIG_EXAMPLE_PIN_CS};
const int pin_count = sizeof(pins)/sizeof(pins[0]);
#if CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
const int adc_channels[] = {CONFIG_EXAMPLE_ADC_PIN_CLK,
CONFIG_EXAMPLE_ADC_PIN_MOSI,
CONFIG_EXAMPLE_ADC_PIN_MISO,
CONFIG_EXAMPLE_ADC_PIN_CS};
#endif //CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
pin_configuration_t config = {
.names = names,
.pins = pins,
#if CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
.adc_channels = adc_channels,
#endif
};
#endif //CONFIG_EXAMPLE_DEBUG_PIN_CONNECTIONS
// Pin assignments can be set in menuconfig, see "SD SPI Example Configuration" menu.
// You can also change the pin assignments here by changing the following 4 lines.
#define PIN_NUM_MISO CONFIG_EXAMPLE_PIN_MISO
#define PIN_NUM_MOSI CONFIG_EXAMPLE_PIN_MOSI
#define PIN_NUM_CLK CONFIG_EXAMPLE_PIN_CLK
#define PIN_NUM_CS CONFIG_EXAMPLE_PIN_CS
static esp_err_t s_example_write_file(const char *path, char *data)
{
ESP_LOGI(TAG, "Opening file %s", path);
FILE *f = fopen(path, "w");
if (f == NULL) {
ESP_LOGE(TAG, "Failed to open file for writing");
return ESP_FAIL;
}
fprintf(f, data);
fclose(f);
ESP_LOGI(TAG, "File written");
return ESP_OK;
}
static esp_err_t s_example_read_file(const char *path)
{
ESP_LOGI(TAG, "Reading file %s", path);
FILE *f = fopen(path, "r");
if (f == NULL) {
ESP_LOGE(TAG, "Failed to open file for reading");
return ESP_FAIL;
}
char line[EXAMPLE_MAX_CHAR_SIZE];
fgets(line, sizeof(line), f);
fclose(f);
// strip newline
char *pos = strchr(line, '\n');
if (pos) {
*pos = '\0';
}
ESP_LOGI(TAG, "Read from file: '%s'", line);
return ESP_OK;
}
void app_main(void)
{
esp_err_t ret;
// Options for mounting the filesystem.
// If format_if_mount_failed is set to true, SD card will be partitioned and
// formatted in case when mounting fails.
esp_vfs_fat_sdmmc_mount_config_t mount_config = {
#ifdef CONFIG_EXAMPLE_FORMAT_IF_MOUNT_FAILED
.format_if_mount_failed = true,
#else
.format_if_mount_failed = false,
#endif // EXAMPLE_FORMAT_IF_MOUNT_FAILED
.max_files = 5,
.allocation_unit_size = 16 * 1024
};
sdmmc_card_t *card;
const char mount_point[] = MOUNT_POINT;
ESP_LOGI(TAG, "Initializing SD card");
// Use settings defined above to initialize SD card and mount FAT filesystem.
// Note: esp_vfs_fat_sdmmc/sdspi_mount is all-in-one convenience functions.
// Please check its source code and implement error recovery when developing
// production applications.
ESP_LOGI(TAG, "Using SPI peripheral");
// By default, SD card frequency is initialized to SDMMC_FREQ_DEFAULT (20MHz)
// For setting a specific frequency, use host.max_freq_khz (range 400kHz - 20MHz for SDSPI)
// Example: for fixed frequency of 10MHz, use host.max_freq_khz = 10000;
sdmmc_host_t host = SDSPI_HOST_DEFAULT();
// For SoCs where the SD power can be supplied both via an internal or external (e.g. on-board LDO) power supply.
// When using specific IO pins (which can be used for ultra high-speed SDMMC) to connect to the SD card
// and the internal LDO power supply, we need to initialize the power supply first.
#if CONFIG_EXAMPLE_SD_PWR_CTRL_LDO_INTERNAL_IO
sd_pwr_ctrl_ldo_config_t ldo_config = {
.ldo_chan_id = CONFIG_EXAMPLE_SD_PWR_CTRL_LDO_IO_ID,
};
sd_pwr_ctrl_handle_t pwr_ctrl_handle = NULL;
ret = sd_pwr_ctrl_new_on_chip_ldo(&ldo_config, &pwr_ctrl_handle);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to create a new on-chip LDO power control driver");
return;
}
host.pwr_ctrl_handle = pwr_ctrl_handle;
#endif
spi_bus_config_t bus_cfg = {
.mosi_io_num = PIN_NUM_MOSI,
.miso_io_num = PIN_NUM_MISO,
.sclk_io_num = PIN_NUM_CLK,
.quadwp_io_num = -1,
.quadhd_io_num = -1,
.max_transfer_sz = 4000,
};
ret = spi_bus_initialize(host.slot, &bus_cfg, SDSPI_DEFAULT_DMA);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to initialize bus.");
return;
}
// This initializes the slot without card detect (CD) and write protect (WP) signals.
// Modify slot_config.gpio_cd and slot_config.gpio_wp if your board has these signals.
sdspi_device_config_t slot_config = SDSPI_DEVICE_CONFIG_DEFAULT();
slot_config.gpio_cs = PIN_NUM_CS;
slot_config.host_id = host.slot;
ESP_LOGI(TAG, "Mounting filesystem");
ret = esp_vfs_fat_sdspi_mount(mount_point, &host, &slot_config, &mount_config, &card);
if (ret != ESP_OK) {
if (ret == ESP_FAIL) {
ESP_LOGE(TAG, "Failed to mount filesystem. "
"If you want the card to be formatted, set the CONFIG_EXAMPLE_FORMAT_IF_MOUNT_FAILED menuconfig option.");
} else {
ESP_LOGE(TAG, "Failed to initialize the card (%s). "
"Make sure SD card lines have pull-up resistors in place.", esp_err_to_name(ret));
#ifdef CONFIG_EXAMPLE_DEBUG_PIN_CONNECTIONS
check_sd_card_pins(&config, pin_count);
#endif
}
return;
}
ESP_LOGI(TAG, "Filesystem mounted");
// Card has been initialized, print its properties
sdmmc_card_print_info(stdout, card);
// Use POSIX and C standard library functions to work with files.
// First create a file.
const char *file_hello = MOUNT_POINT"/hello.txt";
char data[EXAMPLE_MAX_CHAR_SIZE];
snprintf(data, EXAMPLE_MAX_CHAR_SIZE, "%s %s!\n", "Hello", card->cid.name);
ret = s_example_write_file(file_hello, data);
if (ret != ESP_OK) {
return;
}
const char *file_foo = MOUNT_POINT"/foo.txt";
// Check if destination file exists before renaming
struct stat st;
if (stat(file_foo, &st) == 0) {
// Delete it if it exists
unlink(file_foo);
}
// Rename original file
ESP_LOGI(TAG, "Renaming file %s to %s", file_hello, file_foo);
if (rename(file_hello, file_foo) != 0) {
ESP_LOGE(TAG, "Rename failed");
return;
}
ret = s_example_read_file(file_foo);
if (ret != ESP_OK) {
return;
}
// Format FATFS
#ifdef CONFIG_EXAMPLE_FORMAT_SD_CARD
ret = esp_vfs_fat_sdcard_format(mount_point, card);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to format FATFS (%s)", esp_err_to_name(ret));
return;
}
if (stat(file_foo, &st) == 0) {
ESP_LOGI(TAG, "file still exists");
return;
} else {
ESP_LOGI(TAG, "file doesn't exist, formatting done");
}
#endif // CONFIG_EXAMPLE_FORMAT_SD_CARD
const char *file_nihao = MOUNT_POINT"/nihao.txt";
memset(data, 0, EXAMPLE_MAX_CHAR_SIZE);
snprintf(data, EXAMPLE_MAX_CHAR_SIZE, "%s %s!\n", "Nihao", card->cid.name);
ret = s_example_write_file(file_nihao, data);
if (ret != ESP_OK) {
return;
}
//Open file for reading
ret = s_example_read_file(file_nihao);
if (ret != ESP_OK) {
return;
}
// All done, unmount partition and disable SPI peripheral
esp_vfs_fat_sdcard_unmount(mount_point, card);
ESP_LOGI(TAG, "Card unmounted");
//deinitialize the bus after all devices are removed
spi_bus_free(host.slot);
// Deinitialize the power control driver if it was used
#if CONFIG_EXAMPLE_SD_PWR_CTRL_LDO_INTERNAL_IO
ret = sd_pwr_ctrl_del_on_chip_ldo(pwr_ctrl_handle);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to delete the on-chip LDO power control driver");
return;
}
#endif
}
Details ![]()
Show: from Types: Columns: ![]( "Show Project Names")
![]( "Show Locations")
![]( "Show Referring Symbols")
![]( "Show Scope")
This file uses the notable symbols shown below. Click anywhere in the file to view more details.