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

In reference to a past completed project: [url=http://forums.parallax.com/forums/default.aspx?f=21&m=189908]http://forums.parallax.com/forums/default.aspx?f=21&m=189908[/url]
 

I want to find a way to reduce the project so that it can be used on an SX48 from it's current use on an SX52 (proto board). 

 

I have attached 2 files (v3B - SX52 only as it used extra hardware to control the clock with pushbuttons) (earlier v3 - SX52 or possibly with extra hardware designed in to work on an SX48 proto board - no pushbutton control, all in compiling the SXB).

 

Hopefully you can follow what I am saying ... but read on for more clarity:

 


[color=#0000ff]' -------------------------------------------------------------------------
' IO Pins
' ------------------------------------------------------------------------[/color]
[color=#0000ff>Anodes ]Cathodes  PIN   RBC  OUTPUT[/color]
[color=#0000ff></FONT> 

Dta         VAR RA.1    ' Connect DS1302.6 to this pin
RTCCS     VAR RA.2    ' Connect DS1302.5 to this pin[/color]

[color=#0000ff> 

Green      VAR RA.4    ' Connect /OE of (2 &amp; 4) 74HC573[/color]

[color=#0000ff> 

SerData   VAR RA.6    ' serial data (74HC165.7)
Load1      VAR RA.7    ' input load (74HC165.1)[/color]

[color=#ff0000]' -------------------------------------------------------------------------
' IO Pins
' ------------------------------------------------------------------------[/color]
[color=#ff0000]Anodes     PIN   RDE  OUTPUT
Cathodes  PIN   RBC  OUTPUT[/color]

[color=#ff0000][/color] 

[color=#ff0000]Clk             VAR RA.0    ' Connect DS1302.7 to this pin
Dta            VAR RA.1    ' Connect DS1302.6 to this pin
RTCCS        VAR RA.2    ' Connect DS1302.5 to this pin[/color]

[color=#ff0000][/color] 

[color=#ff0000]Green         VAR RA.3    ' Connect /OE of (1 &amp; 3) 74HC573
Red            VAR RA.4    ' Connect /OE of (2 &amp; 4) 74HC573[/color]


[color=#ff0000]:[/color]

[color=#ff0000>:</FONT>

[/color] 

[color=#ff0000]For Color = 0 to 2
If Color = 0 THEN
 HIGH Green
 LOW Red
ELSEIF Color = 1 THEN
 Low Green
 HIGH Red
ELSEIF Color = 2 THEN
 Low Green
 Low Red
Endif[/color]

[color=#000000]' A FOR-NEXT cycle is used to go through all colors and either turn on (active LOW) red LEDs, green LEDs or red+green LEDs (orange/yellow).[/color]

[color=blue>The]configured as a shift register.  You will then need an extra line of
code to transition past the high-high state.  Since that is off/off
for the LEDs and will only last an instruction or two I can't imagine
that there will be any visual glitches.  You also need to make sure
that it comes up in a reliable state.  If the chip doesn't guarantee
that you can probably tie the flip-flop resets to a power reset pin on
the SX48.  [/color]

[color=blue>
Don't]from a few MCU pins and that they have latches to avoid glitches
during the load periods.  If you have more buttons than the two time
setting buttons you can save pins with either a shift register or a
matrix arrangement.[/color]


Does this sound possible with an SX48 or is there any simpler method to use 1 SX I/O pin and control 2 additional lines to external hardware (requires either high or low on those 2 additional control lines)?

 

Thanks,


Tim

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