SD card module with WeAct Black Pill STM32F411CE

Wiring for the SD card module (full size, SPI) on the WeAct Black Pill STM32F411CE (STM32F411CE, 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	WeAct Black Pill STM32F411CE pin	Notes
GND	Ground	G
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	A4 (PA4)
MOSI	SPI MOSI	A7 (PA7)
SCK	SPI clock	A5 (PA5)
MISO	SPI MISO	A6 (PA6)
GND2	Ground	G

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(PA4)) {
    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:GenF4:pnum=BLACKPILL_F411CE,usb=CDCgen,upload_method=dfuMethod. To upload over USB, hold BOOT0, press and release NRST, then release BOOT0 (DFU mode). An ST-LINK on the SWD pins also works.

Questions

Which WeAct Black Pill STM32F411CE pins do I use for the SD card module?

GND → G, 3V3 → 3V3, CS → A4 (PA4), MOSI → A7 (PA7), SCK → A5 (PA5), MISO → A6 (PA6), GND2 → G.

Does the SD card module work with the WeAct Black Pill STM32F411CE at 3.3 V?

Yes: the SD card module runs at 3.3-5 V and the WeAct Black Pill STM32F411CE 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 WeAct Black Pill STM32F411CE pinout · SD card module (full size, SPI): all pins and data

The SD card module on other boards

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