Skip incoming bytes in SERIN

[Alexey]

Hi Mackrackit,

Thank you.

It is PIC16HV540.

it has only 512 words of program memory, 25 bytes or RAM (enough for only three variables) and nothing else. BUT it is 15 volt chip including full 8 bit 15 volt port B (actually I use only two lines of them)

[mackrackit]

It is PIC16HV540.

it has only 512 words of program memory, 25 bytes or RAM (enough for only three variables) and nothing else. BUT it is 15 volt chip including full 8 bit 15 volt port B (actually I use only two lines of them)

Oh....
I will need to think about that one...

[mackrackit]

This is interesting. I have never used a chip this "small"....

What does the data stream look like and what part do you want to skip? Then what do you want to do with it?

[Alexey]

it is a repeating string and the bytes I need are located 9 bytes after symbol 85. Ideally there are 7 bytes I want to know but I have room only for three variables, so I may have to read them one by one every next sycle or use only the first one as it is most important and I only need to ignite a warning LED at certain read value. Now I do it this way:
SERIN PORTB.3,T2400,4000,CLR,[85],VAR,VAR,VAR,VAR,VAR,VAR,VAR,VAR,VAR,VAR

Skipping 9 bytes cost me 45 words of memory which is near 9% of what I have totally

Yes, this chip is very small, but I could not find another one with at least one 15 volt port (regular or open drain) to read and write serial data directly

[mackrackit]

Well I am stuck...
Why not use another chip and a MAX232? Then the data could be pulled into an array.

[Darrel Taylor]

SERIN PORTB.3,T2400,4000,CLR,[85],VAR,VAR,VAR,VAR,VAR,VAR,VAR,VAR,VAR,VAR

Skipping 9 bytes cost me 45 words of memory which is near 9% of what I have totally

Hi Alexey,

This program compiles to 124 words with a 16HV540.

INCLUDE "modedefs.bas"

RX   VAR PORTB.3
B0   VAR BYTE

SERIN RX, T2400,[85]

This one is 154 words.

INCLUDE "modedefs.bas"

RX   VAR PORTB.3
B0   VAR BYTE

SERIN RX, T2400,[85],B0,B0,B0,B0,B0,B0,B0,B0,B0,B0

But this one using DEBUGIN is only 75 words.

DEFINE DEBUGIN_REG PORTB ' Debugin pin port 
DEFINE DEBUGIN_BIT 3     ' Debugin pin bit 
DEFINE DEBUGIN_MODE 0    ' Debugin mode: 0 = True, 1 = Inverted 
DEFINE DEBUG_BAUD 2400   ' Debug baud rate 

B0      VAR BYTE
MyData  VAR BYTE

DEBUGIN [WAIT(85)]       ' wait for 85
FOR B0 = 1 TO 9
    DEBUGIN [MyDATA]     ' skip 9 bytes
NEXT B0
DEBUGIN [MyDATA]         ' get the desired byte

IF only I had a 16HV540 to test it on.

[mackrackit]

Thanks again Darrel,
I never even thought to try DEBUGIN and I certainly did not realize how compact it is.
Another entry in the note book.

[Darrel Taylor]

For the longest time I completely ignored the DEBUG/DEBUGIN statements because it just seemed too much like a Basic Stamp command.

Then I saw Bruce using them a lot and took another look.

They really are better than SERIN/OUT, SERIN2/OUT2.
As long as you only need one baud rate and fixed pins ... which fits probably 90% of the usual serial programs.

Smaller, faster ... better.