Shiftin problem (16f877A with MCP3201)

[financecatalyst]

Thanks a lot for the help. It is working. But could you explain my doubts please?

I think you need mode 4 in the SHIFTIN.

I understand why clock idles high (as data comes on falling edge), BUT why read before sending clock mode?

And it needs to shift 16 bits, not 12. Even though it's a 12-bit result.

Should this be a normal practice or is there something I missed?

A few other changes and ... try this ...

'-------------------
Calibration  CON -1            ; Signed value in 0.1 deg. C - Not sure what this does?
Sensor       VAR WORD

'-------------------
HIGH CS

Main:
    LOW CS
    SHIFTIN Din,Clk,4,[Sensor\16]
    HIGH CS

    Sensor = (Sensor & $FFF) * 5000 ' Understand the first part, we masked the high 4 bits and force them to 0 BUT I dont get the remaining maths, like Why times by 5000? and what does the below statement do
    Sensor = DIV32 4095 + Calibration
    IF Sensor <= 1500 THEN DEBUG DEC Sensor/10,".",DEC1 Sensor,13,10
    PAUSE 1000
Goto Main

[Darrel Taylor]

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The need for 16-bits comes from the MCP3201 datasheet ...




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I didn't overthink the mode number. Just tried different ones till it worked.