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It should be fairly straightforward to write and read a 25xxx eeprom thru the SPI bus using the pc serial port with Keil software. But nowhere do I find the DB-9 to SPI connections. Which pins connects to sck, mosi, miso,cs ? Can you help? Thanks, John
"... the other which contains a uart and a serial to usb translator. So you can load your app code to the eeprom via the pc usb and then plug it into the app circuit." Then if you are using something like an FTDI FT2232C http://www.ftdichip.com/Products/FT2232C.htm you can dispense with its USB-to-UART functionality and use its USB-to-SPI mode http://www.ftdichip.com/Projects/MPSSE/FTCSPI.htm or in its "Bit-Bang IO" mode to program your EEPROM.
At a glance that sure looks like a possibility. Cost is one of the most important factors. I noticed that they have footprints and schematics for Protel. That helps a whole lot. Nordic reccomends : http://www.silabs.com/tgwWebApp/public/web_content/products/Microcontrollers/Interface/en/interface.htm However I came across this earlier this morning: http://www.lancos.com/e2p/si-prog-v2_2.pdf which seems to be what I have been looking for all along. It comes with a nice GUI that loads the hex code. Most of the circuit is power supply.The pertinant part is the db9 to 25xxx230 eeprom wiring. Wonder why they used a transistor to switch cs ?