Mcp3208 adc help

[cncmachineguy]

The way I read the sheet, its not a delay thing. Seems like the A/D uses the SCL to clock the result out, starting some number of clocks after the start bit. So no matter what you do, on the 12th(maybe wrong number, working from memory here)clock, data is comming out. better be ready to catch it. When you "shiftout" the command, thst starts the clock counting. that gives you start bit, then 4 more clocks (i think) then data is comming on the something more clock.

I will need to re-read section 6 to try and wrap my head around it. Let me know if you need more info, I will read some more.

[mister_e]

That seems odd but I'm rusty, so I've ordered a couple of those ADCs. Should have them tomorrow.

Another thing you could try (though I may need another strong coffee)... keep your original code, but read the data on clock falling edge instead of rising edge.

[mister_e]

Duh?!?

3.6 Serial Data Output (DOUT)
The SPI serial data output pin is used to shift out the
results of the A/D conversion. Data will always change
on the falling edge of each clock as the conversion
takes place.

Change your clock idle from low to high, and see what happen.

[mister_e]

That was easy

        high cs
        Pause 100 ' Pause to see display on LCD.
Main:
        LOW CS ' Enable ADC
        SHIFTOUT DataOut, Clock, 2, [%11000] ' Select CH0, Single-Ended
        high Clock
        SHIFTIN DataIn, Clock, 6, [result0\13] ' Read ADC
        HIGH CS ' Disable ADC
        Low Clock
        LCDOUT $FE,1,"ADC: ",dec result0
        PAUSE 100 'Pause long enough to read LCD.
        Goto Main

now read the datasheet to know why it works