I'm trying to use the SD card slot on the ESP32-PRO; I'm using version 3.0.7 of the ESP package (but I've also had the same issues with previous versions).
This is the basic minimal code I'm using for these tests
#include <SPI.h>
#include <SD.h>
File logfile;
void setup() {
Serial.begin(115200);
Serial.println("Starting");
}
void loop() {
Serial.println("Starting loop");
// I'm starting the SD in the loop so that I can see the serial prints in the monitor
if (!logfile) {
if (!SD.begin()) {
Serial.println("SD could not begin, do we have any error?");
} else {
logfile = SD.open("test.log", FILE_WRITE);
}
}
if (logfile) {
logfile.write('t');
logfile.flush();
Serial.println("Wrote to test.log");
}
delay(10000);
}
And, with Core Debug Level: Error they result in the following message:
08:21:29.645 -> Starting loop
08:21:29.942 -> [202764][E][sd_diskio.cpp:200] sdCommand(): Card Failed! cmd: 0x00
08:21:29.942 -> [202770][E][sd_diskio.cpp:761] sdcard_mount(): f_mount failed: (3) The physical drive cannot work
08:21:30.273 -> [203079][E][sd_diskio.cpp:200] sdCommand(): Card Failed! cmd: 0x00
08:21:30.273 -> SD could not begin, do we have any error?
From file:///home/valhalla/Downloads/ESP32-PRO_Rev_B1-3.pdf I believe that the SD CS pin is connected to pin 13, so I also tried to change the above code to SD.begin(13), but I had the same error, and the same happened by adding the following code to esplicitely select the pins:
SPI.begin(14, 2, 15, 13);
SPI.setDataMode(SPI_MODE0);
any hints on what I could be doing wrong?
Umm, this connection is not SPI, it is called 4-bit SD mode. Refer to this article:
https://docs.espressif.com/projects/esp-idf/en/v5.3.1/esp32/api-reference/peripherals/sdio_slave.html