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Part 1 : How to build a USB device with a PIC 18F4550 or 18F

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Posted by stefan, on 26-02-2008 15:02, IP 194.138.39.56

1. access to transmitted data

Hi,
I would like to use the PIC18F4550 USB Demo Board to read out an SPI-Interface and send these data via USB to the PC. The compiler I use is the C18 compiler. I belief, that I am able to implement the SPI interface at the PIC. But I don't know which .h and .c files from the firmware are required. Do you have some examples?
The second question I have is how can I visualize the transmitted data on the PC? The software I am going to use is Visual Basic 2008 (Freeware). Have you some basic instructions?

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Posted by Sylvain, on 28-02-2008 19:10, IP 82.241.45.83

1. USB and SPI

Hello Stephan,

Read from SPI with these PIC is very easy. You can use functions from the C18 library.
Check this document, http://ww1.microchip.com/ downloads/en/devicedoc/ 51297c.pdf
and look at 'SPI functions' page 46 and 'software SPI functions' page 100.
Some examples with this library are here: http://electronicfr.com/ index.php/Microcontrolers- programing/Memo-and-code- exemples-for-C18- programing.html
but not yet about SPI (your help is welcome if you write some working examples)
Sylvain

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