SD card module with NUCLEO-F401RE

Wiring for the SD card module (full size, SPI) on the NUCLEO-F401RE (STM32F401RE, 3.3 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

SD card module pin	Role	NUCLEO-F401RE pin	Notes
GND	Ground	GND
3V3	Power	3V3	Use 3V3 or 5V, not both
5V	Not wired to the board	not connected	Alternative 5 V input through the on-board regulator
CS	SPI chip select	PWM/CS/D10 (PB6)
MOSI	SPI MOSI	PWM/MOSI/D11 (PA7)
SCK	SPI clock	SCK/D13 (PA5)
MISO	SPI MISO	MISO/D12 (PA6)
GND2	Ground	GND

Check before you power it on

Supply: 3.3 V from the 3V3 pin.

Test code (Arduino)

// Library: SD (built in)
#include <SPI.h>
#include <SD.h>

void setup() {
  Serial.begin(115200);
  if (!SD.begin(PB6)) {
    Serial.println("No card: check wiring, the card format (FAT32) and power");
    return;
  }
  File f = SD.open("/test.txt", FILE_WRITE);
  f.println("Hello from the board");
  f.close();
  Serial.println("Wrote test.txt");
}

void loop() {}

Arduino board: STMicroelectronics:stm32:Nucleo_64:pnum=NUCLEO_F401RE. Plug the USB cable into the mini-USB port on the ST-LINK end. No button press is needed.

Questions

Which NUCLEO-F401RE pins do I use for the SD card module?

GND → GND, 3V3 → 3V3, CS → PWM/CS/D10 (PB6), MOSI → PWM/MOSI/D11 (PA7), SCK → SCK/D13 (PA5), MISO → MISO/D12 (PA6), GND2 → GND.

Does the SD card module work with the NUCLEO-F401RE at 3.3 V?

Yes: the SD card module runs at 3.3-5 V and the NUCLEO-F401RE uses 3.3 V signals, so no level shifting is needed.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full NUCLEO-F401RE pinout · SD card module (full size, SPI): all pins and data

The SD card module on other boards

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