2008-01-10 16:21:00 SPI CS is not a "1"
Alex Stewart (UNITED STATES)
Message: 49458 Hi,
So Ive been trying to get the SPI worked out for a few weeks now. And I think I've finally made it through understanding the framework. I have one problem however. With an o-scope connected up, I can see my CLK and MOSI send my data correctly and my CS line does "frame" my data, but it idles at 1.1V not ~2.5V like CLK and MOSI......
I thought this may be because of a missing pullup, but even with a 1K pull up on the CS line I cant get it to idle at >~1V.... My device is active low, but it still thinks it is selected even when CS is "idle"....
Im using the SPI framework, Slave Select #5 on a BF537-STAMP board....
And its not the ADC im connected to, because the CS acts the same with or without the ADC connected....
Thanks for the Help!!!!
2008-01-14 21:43:02 Re: SPI CS is not a "1"
Bryan Wu (CHINA)
Message: 49570 Hi Alex,
Did you modified any source code to do this test?
CS can be controlled by software driver or user space application.
Maybe a bug I fixed several days ago can be a reference for you.