STM32F4 slowed down

[xtian]

Posted on February 26, 2013 at 01:13

HI ST COMMUNITY,

I just wondering why my stm32f4 Discovery board seems to slowed down, I am still using the same program. I've just powered it on as usual and make it do its usual task of capturing data.. Then when I try to see the data it is capturing it is incomplete so I tried to re program it... still same results so I tried to see the signals on the scope and yes it really have slowed down so I have decreased the delay but now It cannot decode numeric data properly. I will still check if the cable is the problem. but before that happened I am usually using it to transfer captured data on the serial at 961200 at a delay of FFF the program that recieves the data is a labview program. I have used a delay of FFF because the program cannot see data at a delay of FF now it can read at a delay of FF and if i increas my delay to FFF suceeding data are not read  

[xtian]

Posted on February 26, 2013 at 01:17 is it possible that my board was already STATIC infected.? additional info before when you send for example ABCDEF123456 it would recieve the same way now... sometimes ABCDEF123456 sometimes abcdEF123456 sometime aBCdEF+(constant special characters) and other Variating sizes....  it is really confusing why

[Tesla DeLorean]

Posted on February 26, 2013 at 02:06

Corrupt data is more of a sign of signal noise than silicon bit rot. Perhaps you have a bad ground connection, supply issues for the PLL/VCO, or you need to slow the data transfer down to more realistic levels. Asynchronous serial is not considered very robust.

Consider what you have changed, cables you connected, etc.

[xtian]

Posted on February 26, 2013 at 03:19 Hi clive, thank you as always... you were right... one of my ground has loos connections... it is working good again...