I can connect with JTAG via SWD and load a simple program but after load the system won't run to main. The chip seems to be stuck in some hardware system reset loop. Attached is an image of the nRST pin. I've gone through AN4661 many times and ca...
The problem was with the option bytes. As Bob and AvaTar suggested I stepped through the code and noticed that the bad bards were loading address 0x1FF00210 which is the STM32 bootloader. This led me down the path to check the boot option bytes (Th...
REPOSTEven with BOOT0 set high the system stays in this infinite reset loop. I'm leaning towards an issue with the bootloader but the error seems unrecoverable.
After changing VCAP to 2.2uF I was able to successfully load a simple LED test using Keil and JLINK and get the LEDs to blink. After verifying I am able to load code, I loaded a custom bootloader and the boards goes into this infinite reset state. I ...
Sounds like bulk and bypass capacitance might be the problem.On the output of the MIC5332 is 1uf, 0.1uf, 10uf network.On VCAP1/2 I have 0.1uF. Datasheet shows 2.2uF (This might be the problem)On the VDD pins I have 0.1uF on each pin and then a 1.0uF ...
Yeah, custom board.Will test with BOOT0 = HIGH.VDDA = 3.3VVCAP = 1.2V with odd ripple (see trace)I am using this LDO. Micrel - MIC5332. https://www.digikey.com/products/en?keywords=576-4110-1-ND (3.3V 300mA).3.3V Power rail ripple
