Light Controller Problem

lboucher

HI Everyone

So i am really new to SX and assembly.

I am trying to make an SX christmas light controller. (Actually several connected together)
So out of the 20 IO pins on the SX28 i plan to have 17 light channels, 1 rx serial line from a laptop, 1 tx serial line to the next microcontroller in the in the sequence, and 1 zero cross detector.

I have not implimented the serial tx yet.

So far i have implimented an interrupt based serial receive, and dimming control for 4 channels.
This works just fine.

When i try to take this same code and ramp up to 17 channels it doesn't work.
I am thinking i am doing something wrong with banking?

I really don't know how to debug this problem and need help.

I have attached my code for the working 4 channel controller and the non working 17 channel controller.
Please help.

PJMonty

lboucher,

Since SX/B arrays can only have 16 entries (if I remember), just try expanding up to a 16 channel dimmer. Yes, you'll have a spare pin unused, but I have a feeling it will make all your code work without a lot of effort.

Thanks,
PeterM

Peter Verkaik

You need at least to set the correct bank in the interrupt routine.
I did it for you in the attachement.

SXB does support large arrays on sx28,so you could use
level var byte (17) span
acc var byte (17) span
for index = 0 to 16
· acc(index) = acc(index) + level(index)
next

But this does generate slightly more code due to the spanned arrays.

regards peter

lboucher

Thanks i will have to try this late tonight after work.
Why do i only need to set the right bank in the interrupt routine, do i not also have to worry about the main program?

Thanks
LUcas

Zoot

Because the FSR (which is the register that determines what bank you are "working in") is saved and restored automatically by the SX at the hardware level upon entering/leaving the ISR. So is W and STATUS (but not M nor any other normal registers).

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JonnyMac

Since your code seems to be using some of my code -- which I "liberated" from someone else -- I've updated the base of your program. I don't have anything to test this on so I'll leave it to you. Since you're using all of RC and RB the strategy employed in this version uses fewer cycles to handle those ports.

If you use RS-485 or some other multi-drop scheme you may not need to implement TX.

[noparse][[/noparse]Edit] Inserted required BANK statements.

Post Edited (JonnyMac) : 3/12/2009 9:48:08 PM GMT

lboucher

Thanks, and thanks for the original code.

I am implimenting Renard Version 1 by the way.

Looking at this breifly at work i have questions.

first of which is, why is there no "bank" statements don't ya need them?

What does the Delay MS sub function do?

JonnyMac

Sorry, I was not quite awake when I wrote that and the Starbucks had not kicked in! I fixed the post above.

DELAY_MS is a replacement for PAUSE in case you want to do some stand-alone sequencing and need a way to do accurate delays. If you want to hold the program for one second you do this:

DELAY_MS 1000

If you use PAUSE the delay won't be accurate because the ISR will extend the timing. BTW, in my updated program I recoded DELAY_MS and RX_BYTE in Assembly.

Post Edited (JonnyMac) : 3/12/2009 10:18:22 PM GMT

lboucher

Thanks all, up and running great.
Even have the TX implimented, i think it is working, but need to set up a second SX chip to be sure.