In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

Jon / Bean and others,

I deeply appologize for this embarassing moment. I found out the problem as operator error for the most part.

The BS2 stamp (Experiment 23) shows the following:

Clock           CON     0                       ' shift clock (74HC595.11)
DataOut         CON     1                       ' serial data out (74HC595.14)
Latch           CON     2                       ' output latch (74HC595.12)

and the SX SHIFTOUT program shows the following:

Dpin  VAR RA.0   ' shift data
Cpin  VAR RA.1   ' shift clock
Latch  VAR RA.2   ' latch outputs

No one noticed this difference including myself. 

After concentrating on wires for 595 pins 11, 14 and 12 for pins 0, 1 and 2 - I failed to see that the Dpin and Cpin are reversed as compared to the BS2 program. I should have caught something so simple. 

When I changed the SX code to read:

Dpin  VAR RA.[b]1[/b]   ' shift data
Cpin  VAR RA.[b]0[/b]   ' shift clock
Latch  VAR RA.2   ' latch outputs

It worked fine as it should. 

Jon,

You were right about the clock line as this is when I focused on the clock and saw the problem. 

Once again - I appologize for all inconviences. 

Thanks to all 

Timothy Gilmore

PS: I hope I did not kill too much of your Holiday weekend as it did mine.

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