STM32F401 Board STM32F401CCU6 STM32F4 Board Learning Board for Arduino 3 Pack

these modules provide a good alternative to the stm black pill devel board. They work well and i've used many in various projects. If you're looking for a black pill, this is the one.

The construction of the boards I got look very good, components seem to be good quality (crystal, button, deep switches, etc), the MCU seems to be genuine ST and works with Cube MX and an original STLink2, and I like having the C type USB. Works well with VSCode and platformio which makes programming a fun.I am programming it with STLink2 (faster and easier) so can't comment about the DFU or Arduino bootloader and the switches to select them.Edit: apparently this board has different pinout and less memory than the common WeAct based design which is based on STM32F401CEU6. I plan to switch the other design which seems to have a few sources, both actual WeAct and clones.I switched to this board, from the more common bluepill because of the larger ROM/RAM but also like what seems to me as a better quality board than the common bluepills.

The microcontroller used is an STM32F401RC and you can find a pdf file for it on the STM web site. The markings on the chip for the 3 units were unreadable. I used STLINK to test every one of the units and they had 256KB Flash memory. That's what makes it an 401RC instead of a 401RB which comes with 128kB of FLASH, otherwise they are interchangeable. The SWD port worked which is all I needed since I will be using the CubeIDE and not Arduino as my development environment. So if you have good soldering skills the package is a good deal. If you can't solder, don't bother. Buy something else that's fully assembled. In the CubeIDE I picked the STM32F401RCT6 as my target.

These work fine for experienced users wanting F401 with 256k flash. It is recognized by STM32 software as such; but do note that there are other F401 out there with different specs -- they are not all the same. To use this with USB/dfu mode you will need to push the jumper switch closest to the button while it is plugged into USB port. Open Device Manager if on Windows and go to Universal Serial Bus Devices. Hit the Button and the list will refresh. You will find STM32 BOOTLOADER in the list. At that point you are ready to flash. After flashing it will likely auto re-enumerate as another device and boot your code. I have only used with Arduino and not with anything based on the HAL.

I bought a pack of 3. Out of which one did not work. The original bootloaderthat came with it was ok for my style of programming in linux. But after that was deleted, I havewasted days trying to recover. No success. The other option of DFU boot loader using thedip switches is nightmare. It is not worth falling for the cheap price.

Remove tape and close dip switch closest to the reset button. In the Arduino environment, set the upload method to STM32CubeProgrammer(DFU). Set board to Generic STM32F4 and the part number to Black Pill F401CC. LED is on PC13. USB Serial, Real Time Clock, Timers, and the LED all work as expected. To upload another Arduino sketch, press the reset button and upload. Once you are finished tinkering, open the dip switch to make your program load on power up.

The board work. Was able to down load and program with a simple program on the first attempt.Yah!.

Not sure if the product is still this way, but these units did not have normal STM32 "black pill" pinout, and had 0.7" row spacing rather than 0.6" row spacing. Probably work, but could not use as my requirement was for standard "black pill" configuration. Too late to return, not a big deal, but suggest check carefully if you purchase and this would be an issue.