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QT300
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Guest
PostPosted: Tue Aug 24, 2004 7:41 am     Reply with quote
in the QT3View, I saw the SPI speed is 2.553khz, and all the others are the same three digits after"." how can I set timer2 to these spi speeds. just for my case, clock is 8mhz.
Guest
PostPosted: Tue Aug 24, 2004 12:49 pm     Reply with quote
I have been working on it for three days, anyone would help? I am a little frustrated by it.
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Tue Aug 24, 2004 1:05 pm     Reply with quote
Quote:

In the QT3View, I saw the SPI speed is 2.553khz, and all the others are the same three digits after"." How can I set timer2 to these spi speeds. Just for my case, clock is 8mhz.


Quote:
I have been working on it for three days, anyone would help? I am a little frustrated by it.


I think you should write a test program, similar to the sample
shown in the following link.
http://www.ccsinfo.com/forum/viewtopic.php?t=20279&start=1
Then experiment with the parameters in the setup_spi() function,
while looking at the output waveforms with an oscilloscope.

Experiment with the parameters until you understand how the function
works, and find the correct parameters to produce your desired SPI
clock frequency. You may find that you can't get a frequency as
low as you desire. You might have to reduce your PIC clock frequency.
I don't know. But when you do the experiments, you will find out.
And, when you do these tests, you learn how to solve problems for
yourself.
Guest
PostPosted: Tue Aug 24, 2004 2:32 pm     Reply with quote
what kinds of osciloscope should I use, I did not have one, I shold buy one according to your suggestions.
Guest
PostPosted: Wed Aug 25, 2004 11:58 am     Reply with quote
QT300 is setup as SPI idle low, slave mode, I setup_spi(SPI_MASTER|SPI_H_TO_L|SPI_CLK_T2) is this correct.
Guest
PostPosted: Wed Aug 25, 2004 2:48 pm     Reply with quote
I have setup QT300 as slave as QT guys told me., still nothing happened. I also posted my program there waiting for help.

SOS
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