Is it possible to interpret non-standard serial data with PicBasic (sample attached)

[CuriousOne]

Going totally crazy, can't figure out what to do and how

[CuriousOne]

Logically, code should look like this:

WAIT FOR LOW LEVEL AND MEASURE IT'S DURATION
IF LOW LEVEL LENGTH=10MS THEN MEASURE HIGH LEVEL DURATION AFTER IT
IF HIGH LEVEL DURATION WAS 2MS, THEN GO TO NEXT STEP, ELSE, LOOP THIS CYCLE AGAIN
NEXT LEVEL:
CONSIDER 600US LOW LEVEL AS 1, AND 2MS LOW LEVEL AS 0, WRITE THEM SEQUENTALY TO 32 BIT ARRAY, UNTIL 32 BITS WRITTEN
EXTRACT MSB AND LSB FROM ARRAY
CONVERT TO WORD

[CuriousOne]

Or, more "programmer" approach. Assuming "A" is the input pin:

START COUNTING
A=0, B=0
WHILE A=1, B=B+1
WHILE A=0, C=C+1
IF B=500 AND C=100 THEN CONTINUE, ELSE, START OVER
B=0 C=0
FOR N=1 TO 32
WHILE A=1, B=B+1
WHILE A=0, C=C+1
IF B=50 AND C=50 THEN CONTENTS[N]=1
IF B=50 AND C=150 THEN CONTENTS[N]=0
A=0, B=0
NEXT N

[HenrikOlsson]

Here's one idea:

HighTime  VAR WORD
LowTime   VAR WORD
BitArray  VAR WORD [2]
LSB       VAR BitArray.LowWord
MSB       VAR BitArrat.HighWord

WaitForStartBit:
  GOSUB MeasureLow
  IF (LowTime < 9500) OR (LowTime > 10500) THEN WaitForStartBit    ' 9.5-10.5ms qualifies
  GOSUB MeasureHigh
  IF (HighTime < 1500) OR (HighTime > 2500) THEN WaitForStartBit    ' 1.5-2.5ms qualifies
 
NextLevel:
For i = 0 to 31
  GOSUB MeasureLow
  IF (LowTime > 400) AND (LowTime < 800) THEN BitArray.0[i] = 1     ' 500-700us qualifies as 1
  IF (LowTime > 1700) AND (LowTime < 2320) THEN BitArray.0[i] = 0   ' 1800-2200us qualifies as 0
NEXT
LCDOUT $FE,$01, "HighWord", DEC MSB
LCDOUT $FE,$C0, "LowWord", DEC LCB

Pause 1000
Goto WaitForStartBit

MeasureLow:
  LowTime = 0
  While Signal = 1 : WEND         ' Wait for low level
  While Signal = 0                ' Measure low level
    LowTime = LowTime + 100       ' Resolution is 100us, change if needed
    PauseUS 92                    ' Tweak to calibrate, depends on actual loop time
  WEND
RETURN

MeasureHigh:
  HighTime = 0
  WhileSignal = 0 : WEND	  ' Wait for low  
    While Signal = 1              ' Measure high level
    HighTime = HighTime + 1       ' Resolution is 100us, change if needed
    PauseUS 92                    ' Tweal to calibrate, depends on actual loop time
  WEND
RETURN

I can't compile this let alone test it but it serves to show the genereal idea of a software only solution.

[CuriousOne]

Thanks, will give it a try tomorrow.

My oscilloscope can record in .csv format, is it possible in some emulator to "play back" this recording, and feed it to virtual chip? So I can test and debug without using original hardware, which generates these pulses.

[richard]

the waveform is simple to simulate like this is you have a chip with a dsp module.
note the timings are estimated since the curious one's info is lacking most of the meaningful detail

'****************************************************************
'*  Name    : MODULATOR.BAS                                     *
'*  Author  : [select VIEW...EDITOR OPTIONS]                    *
'*  Notice  : Copyright (c) 2016 [select VIEW...EDITOR OPTIONS] *
'*          : All Rights Reserved                               *
'*  Date    : 5/29/2016                                         *
'*  Version : 1.0                                               *
'*  Notes   :                        *
'*          : 16F1825                                           *
'****************************************************************
  #CONFIG
             __config        _CONFIG1,    _FOSC_INTOSC & _CP_OFF & _WDTE_ON  &  _PWRTE_ON  &  _MCLRE_ON  & _CLKOUTEN_OFF
              __config      _CONFIG2, _PLLEN_ON & _LVP_OFF            
#ENDCONFIG
 
OSCCON=$70 
DEFINE OSC 32
 
'                       PIC 16F1825
 
TRISA     = %111111    ' Make all pins Input 
trisc     = %101111  ;Make all pins Input   
ANSELA=0     
ANSELC=0
MDSRC=    %00000000
MDCARH   =%11000100
MDCARL   =%00000000
X VAR byte
darta   VAR byte[4] 
TIMER1     VAR WORD EXT
clear
modout var latc.4
darta.0[15]=1 
hpwm 1,128,1600
MDCON.0 = 0
modout =0
Main_Loop:
modout=1
pauseus 8000
modout =0
while tmr2 :wend
MDCON=    %11000000
for x = 0 to 31
while tmr2 :wend
MDCON.0 = !  darta.0[x]
next  
modout=1
MDCON=    0
pauseus 600
modout = 0
PAUSE 200 
goto Main_Loop
end