You are reading a single comment by @fanoush and its replies.
Click here to read the full conversation.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@fanoush
Could it be that you once flashed firmware for other board like PUCKJS or MDBT42Q and then reflashed it with BANGLEJS again? pin 21 which is normally a reset pin is used as flash CS pin https://github.com/espruino/Espruino/blob/master/boards/BANGLEJS.py#L142 and most other builds would reconfigure it back as reset pin which would make flash CS pin not working. You can verify by running
peek32(0x10001200)If it prints21then it is this issue and can be fixed.