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
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 ?