【发布时间】：2019-05-31 01:59:24
【问题描述】：
我是使用微控制器的新手，我正在测试 platformio id 的示例代码的操作以在 sd 中创建一个文件，但是当我将它传递给 ESP32 后编译它时，它会抛出出现在图片“确保 SD 卡线有上拉电阻 esp32”。是代码问题还是我需要给连接增加一些阻力？
我留下了它是如何连接的图像
谢谢
/* SD card and FAT filesystem example.
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 <stdio.h>
#include <string.h>
#include <sys/unistd.h>
#include <sys/stat.h>
#include "esp_err.h"
#include "esp_log.h"
#include "esp_vfs_fat.h"
#include "driver/sdmmc_host.h"
#include "driver/sdspi_host.h"
#include "sdmmc_cmd.h"
static const char *TAG = "example";
// This example can use SDMMC and SPI peripherals to communicate with SD card.
// By default, SDMMC peripheral is used.
// To enable SPI mode, uncomment the following line:
// #define USE_SPI_MODE
// When testing SD and SPI modes, keep in mind that once the card has been
// initialized in SPI mode, it can not be reinitialized in SD mode without
// toggling power to the card.
#ifdef USE_SPI_MODE
// Pin mapping when using SPI mode.
// With this mapping, SD card can be used both in SPI and 1-line SD mode.
// Note that a pull-up on CS line is required in SD mode.
#define PIN_NUM_MISO 2
#define PIN_NUM_MOSI 15
#define PIN_NUM_CLK 14
#define PIN_NUM_CS 13
#endif //USE_SPI_MODE
void app_main(void)
{
ESP_LOGI(TAG, "Initializing SD card");
#ifndef USE_SPI_MODE
ESP_LOGI(TAG, "Using SDMMC peripheral");
sdmmc_host_t host = SDMMC_HOST_DEFAULT();
// To use 1-line SD mode, uncomment the following line:
// host.flags = SDMMC_HOST_FLAG_1BIT;
// 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.
sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
// GPIOs 15, 2, 4, 12, 13 should have external 10k pull-ups.
// Internal pull-ups are not sufficient. However, enabling internal pull-ups
// does make a difference some boards, so we do that here.
gpio_set_pull_mode(15, GPIO_PULLUP_ONLY); // CMD, needed in 4- and 1- line modes
gpio_set_pull_mode(2, GPIO_PULLUP_ONLY); // D0, needed in 4- and 1-line modes
gpio_set_pull_mode(4, GPIO_PULLUP_ONLY); // D1, needed in 4-line mode only
gpio_set_pull_mode(12, GPIO_PULLUP_ONLY); // D2, needed in 4-line mode only
gpio_set_pull_mode(13, GPIO_PULLUP_ONLY); // D3, needed in 4- and 1-line modes
#else
ESP_LOGI(TAG, "Using SPI peripheral");
sdmmc_host_t host = SDSPI_HOST_DEFAULT();
sdspi_slot_config_t slot_config = SDSPI_SLOT_CONFIG_DEFAULT();
slot_config.gpio_miso = PIN_NUM_MISO;
slot_config.gpio_mosi = PIN_NUM_MOSI;
slot_config.gpio_sck = PIN_NUM_CLK;
slot_config.gpio_cs = PIN_NUM_CS;
// 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.
#endif //USE_SPI_MODE
// 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 = {
.format_if_mount_failed = false,
.max_files = 5
};
// Use settings defined above to initialize SD card and mount FAT filesystem.
// Note: esp_vfs_fat_sdmmc_mount is an all-in-one convenience function.
// Please check its source code and implement error recovery when developing
// production applications.
sdmmc_card_t* card;
esp_err_t ret = esp_vfs_fat_sdmmc_mount("/sdcard", &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 format_if_mount_failed = true.");
} else {
ESP_LOGE(TAG, "Failed to initialize the card (%d). "
"Make sure SD card lines have pull-up resistors in place.", ret);
}
return;
}
// 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.
ESP_LOGI(TAG, "Opening file");
FILE* f = fopen("/sdcard/hello.txt", "w");
if (f == NULL) {
ESP_LOGE(TAG, "Failed to open file for writing");
return;
}
fprintf(f, "Hello %s!\n", card->cid.name);
fclose(f);
ESP_LOGI(TAG, "File written");
// Check if destination file exists before renaming
struct stat st;
if (stat("/sdcard/foo.txt", &st) == 0) {
// Delete it if it exists
unlink("/sdcard/foo.txt");
}
// Rename original file
ESP_LOGI(TAG, "Renaming file");
if (rename("/sdcard/hello.txt", "/sdcard/foo.txt") != 0) {
ESP_LOGE(TAG, "Rename failed");
return;
}
// Open renamed file for reading
ESP_LOGI(TAG, "Reading file");
f = fopen("/sdcard/foo.txt", "r");
if (f == NULL) {
ESP_LOGE(TAG, "Failed to open file for reading");
return;
}
char line[64];
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);
// All done, unmount partition and disable SDMMC or SPI peripheral
esp_vfs_fat_sdmmc_unmount();
ESP_LOGI(TAG, "Card unmounted");
}
【问题讨论】：
-
请在问题中包含您的代码，而不是您使用的库。作为错误状态，您很可能需要在电路中添加上拉电阻。在这一点上，这不是一个编程问题。 ESP32 确实有 SD 卡接口，但我不认为它在 Arduino 代码中可用。
-
首先确保您的接线正常，并且 SD 具有正确的格式并经过测试。我在您的终端中看不到
esp_vfs_fat_sdmmc_mount的错误代码。你能把它打印在一个单独的行上并给我们代码以获得更好的帮助吗？ -
@Strom 嗨，这是为我提供用于测试 SD 的 platformio 的项目示例，以 FAT 32 格式格式化的 SD hase
-
@M. R.我使用的代码是我附加的，我不区分它是否是一个库，这是我必须做的第一个工作，我仍然不知道，c ++我只处理基础，对不起；至于错误，我认为图像的最后一行是终端中出现的所有内容，稍后尝试尝试分开
标签： c++ memory arduino esp32 platformio