Microcontroller does not start

[aamirali641989]

Posted on May 13, 2014 at 21:45

I am facing a strange problem using STM3205RBT6

Sometimes when I power up my controller it does not get start executing the code.First line of my code is to configure a pin output & toggle it. Sometimes it doesn't happen.Most of time code works fine. When code does not run, then on connecting external debugger code starts running.I was looking to attach my circuit in pdf format, but I found no such link here. Circuit is simple connecting all capacitors according to datasheet except on reset a 10K pull up & 0.1uF decoupling cap is connected.I had also monitored the reset pin via oscilloscope no noise on it which could make it reset. Update (Guess) : I am using keil. It has function system_init() before entering main(). Possibly PLL get stuck sometimes & not get started. I have to add some counter which can break while loops in it. I am using PLL to create 120Mhz.System_init file is created using excel utility provided by STDo anyone have same problem.How to solve this problem.

[Tesla DeLorean]

Posted on May 13, 2014 at 21:58

Or if the HSE doesn't start, and you attempt to use that as a source for the PLL.

I guess you need to recognize when the HSE and/or PLL don't start, and have some fail-over option using the HSI (which should start), and use a GPIO or USART configured real early to provide some diagnostic output.

[gkennerknecht]

Posted on May 23, 2014 at 07:00 Hello, have you observed the temperature. I´m having a problem of the same kind. But on our products it´s temperature dependet, and dependent on the new Revision of ARMx. If we exceed a temperature of 45Degree the internal oscillator won´t start up.