# Forum: µC & Digital Electronics Atmega 644 mit FTDI 221X über SPI

 Author: Johannes Walcher (Guest) Posted on: 2014-08-25 19:04

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Hey Guys,

I am trying to connect a FTDI 221X [1][2] (in 1-Bit mode) with an
Atmmega 644. The Documentation tells me it is "some kind of spi", but I
am unable to get it running.

My Circuit looks something like that:

  |-------| |---------------| | _644_ | | FT221X | | CLK |-----| CLK | | MOSI |-----| IO0 (MIOSIO0) | | MISO |-----| ??? | |-------| |---------------| 

I have no clue, where to put MISO from Atmega, so I left it unconnected
(because the "MISO" of FT221X is some kind of state flag)

With this configuration I could send data from 644 over FT221X to USB
without any problems, but I cannot find circuit and code where I can
read data from the FT221. I have tested all data Lines with my Oszi and
tried to see any kind of useful signal - nothing.

just say a word.

Greetings,

Johannes

[1] http://www.ftdichip.com/Products/ICs/FT221X.html
[2]
http://www.ftdichip.com/Support/Documents/DataShee...

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