Code:
/*
-----------------------------------------------
| NodeMCU32s | SD Card |
| --------------------------------------------
| - | D02 |
| - | D01 |
| GPIO23 | CMD(MOSI) |
| GPIO19 | D00(MISO) |
| GPIO18 | CLK(SCK) |
| GPIO5 | D03(SS) |
| GND | GND |
| VCC(3.3v) | VCC |
-----------------------------------------------
*/
#include "FS.h"
#include "SD.h"
#include "SD_MMC.h"
void WriteFile(fs::FS &fs, const char *path, uint8_t *buf, int len)
{
//unsigned long start_time = millis();
Serial.printf("write [%s]...\n", path);
File file = fs.open(path, FILE_WRITE);
if (!file) {
Serial.println("Failed to open file for writing");
return;
}
if (!file.write(buf, len)) {
Serial.println("Write failed");
return;
}
file.flush();
file.close();
Serial.printf("Write [%s] Complete", path);
}
void ReadFile(fs::FS &fs, const char *path, uint8_t *buf, int len)
{
Serial.printf("read [%s]...\n", path);
File file = fs.open(path);
if (!file) {
Serial.println("Failed to open file for reading");
return;
}
if (!file.read(buf, len)) {
Serial.println("Read failed");
return;
}
file.close();
Serial.printf("Read [%s] Complete: %s", path, buf);
}
void testIO(fs::FS &fs)
{
char buf[] = "hello world";
WriteFile(fs, "/test.txt", (uint8_t *)buf, strlen(buf));
ReadFile(fs, "/test.txt", (uint8_t *)buf, strlen(buf));
}
void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
Serial.println("please insert SD card");
delay(8000);
/* SD SPI Mode at VSPI */
SPIClass spi = SPIClass(HSPI);
spi.begin(18 /* SCK */, 19 /* MISO */, 23 /* MOSI */, 5 /* SS */);
if (!SD.begin(5 /* SS */, spi, 80000000)) {
Serial.println("Card Mount Failed");
return;
}
testIO(SD);
SD_MMC.end(); // cancel load SD card
}
void loop() {
}
![[Image: dimmer-connect.png]](https://i.postimg.cc/9X9vRyMT/dimmer-connect.png)
