Questions on control of serial busses
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Joined: Fri Oct 19, 2012 5:11 am


Post by YahooArchive »

>from help line
>I\'m trying to use SPI to interface a MAX6675 TC chip to an ARMmite with BASIC.
Could you provide a bare bones code example that would give me a start on this?
I\'ve been unable to make any headway after considerable effort.

SPI is not really a standard, it basically means you have a couple wires that
are a serial interface to the peripheral.

This device falls into a class that might better be done with SHIFTIN

While I can't test it this should be pretty close (I assume that CSpin, CLKpin
and INpin have been #define 'd)

#define SHIFTpreSample ' because data is ready when CS goes low

shiftCounts(0) = 32

IO(CSpin) = 0
shiftin (INpin,CLKpin,0,1) 'read the value
IO(CSpin) = 1

max6675_reading = shiftValues(0)

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