[Amforth-devel] a few snippets around SPI

[Erich W. <ew....@na...>]

Hello,

I spent some time fiddling with spi devices:
. MAX186 12 bit ADC
. Hope RFM12

I split out a bit-bang version (not that you ever need this
on an AVR :-) and a version using the spi interface. Please
find attached two examples. Tested with amforth 3.4.

Since for every byte there is a response byte, sending
several bytes in a row might be a little messy. Also the
docs say, that between bytes releasing and requesting "slave
select" will synchronize the slave again. It did work
without that for me _so_far_ ... but you never know. The bit
bang version seems to slow to handle incoming rfm data. At
least I did not yet get it to work properly.

Matthias, feel free to add the relevant sections to the lib
directory of amforth.

Cheers,
Erich