I wrote some usb code and was wondering, is there a sense pin that would put the chip in DFU mode? Or, how else could I exit my usb mode and enter DFU programming?
It's called a button on BOOT0 pin
Or handle it yourself, you'd either want your own button that you check as you start, and redirect into the ROM, or have it recognize a USB packet generated by the host to switch into DFU mode.
ST provides DFU and IAP example firmwares as part of the Cube/HAL or SPL platforms.
Hi, First, connect your iPhone to the computer via USB cable. After that hold the Power Button present at the side of iPhone for around 3 seconds. Then hold the power button and then press the home button again and then hold both of them for 15 seconds. After this step, release the power button and continue to press the home button for almost 10 seconds. If you see all black screen on your phone and then your device will go into DFU Mode. Regards, Erica Clayton Techrubik.com