Arduino for STM32

Out of curiosity I tested a F405RG board I never used before as blue pill suffices all my needs. I could not get the serial working not even blink test although the download via serial or STlink was successful. Then I switched to Roger's core and programmed it as a F407V, both serial and blink worke...

I meant the graphics test ran properly on my TFT.
Before I connected the BL pin to HIGH, the screen was all black but logic analyzer told me the SPI was running properly.
I recall the BL pin of some TFT's can be left open but some not.

I tried your sketch and my TFT did not work until I connected the BL pin to HIGH.
By the way I cannot see your images and I am unsure what has failed on your TFT.
For me it is just the BL pin cannot be left open.

It is asking too much for operating conditions not covered by the specifications. One may purchase a bunch of 128k and do the screening. A possible bet is to check if the 64k chip is actually a 128k. Almost all 64k bluepills I got have 128k embedded flash. I have seen many hobbyists overclock the co...

You may also check the power supply. GSM module can take 2A peak current during transmission, especially during the network search. As stated in the datasheet you need large value capacitors connected at the power supply. Not sure if your Arduino board has a bigger capacitor than your STM32 board.

According to datasheet the max SPI clock for RFM69 is 10MHz. Are you driving it beyond the published limits?

Does the demonstrator accept hex files?
You can compile to hex file using "Ctrl+Alt+S" or "Export Complied Binary" under the Sketch menu.

The STlink on the nucleo board can emulate a virtual com port which can be connected to the serial port of your bluepill.

Here comes the 3rd option: get a STLink v2.1 (99.9% in the market are all v2) and it can support code upload and virtual com port at the same time. Or you get a Nucleo-64 board for your development. All Nucleo series come with STLink v2.1 on board. If you love to DIY then you may take a look here ht...