Troubled with Instant Ints and TMR2

**Josuetas** · - 6th October 2007, 01:03

Hi Darrel

I made some tests on the ASM handler for my TMR2 interrupt, it works ALMOST fine.

Before posting i double checked this.

First The timer is interrupting correctly every 0.000125uS and taking the samples, how did i checked this? well first i used HSEROUT to my serial port of the whole sample and i got something. At the Same time i needed to check the timing, so i modified the handler to add a toggle of a pin in the uC after each Sample, then i measured it with the oscilloscope and got the correct frequency.

Code:

<html>
<head></head>
<body><!--StartFragment--><pre><code><font color="#000000"><b>CLEAR

DEFINE OSC </b>4
<b>DEFINE HSER_RCSTA </b>90<b>h       </b><font color="#000080"><i>' Set transmit register to transmitter enabled
</i></font><b>DEFINE HSER_TXSTA </b>24<b>h       </b><font color="#000080"><i>' Set baud rate
</i></font><b>DEFINE HSER_BAUD </b>9600
<b>DEFINE HSER_CLROERR </b>1


<b>LCD_DB4         VAR PORTA</b>.6 <font color="#000080"><i>;************LCD_AnyPin declarations
</i></font><b>LCD_DB5         VAR PORTB</b>.6
<b>LCD_DB6         VAR PORTB</b>.5
<b>LCD_DB7         VAR PORTB</b>.4
<b>LCD_RS          VAR PORTA</b>.0
<b>LCD_E           VAR PORTA</b>.7
<b>LCD_Lines       CON </b>2    
<b>LCD_DATAUS      CON </b>50   
<b>LCD_COMMANDUS   CON </b>2000 


<b>INCLUDE </b><font color="#FF0000">&quot;LCD_AnyPin.pbp&quot; 
</font><b>INCLUDE </b><font color="#FF0000">&quot;DT_INTS-14628.bas&quot;
</font><b>INCLUDE </b><font color="#FF0000">&quot;ReEnterPBP.bas&quot;
</font><b>INCLUDE </b><font color="#FF0000">&quot;Elapsed_INT.bas&quot;


</font><b>PinActivar      VAR porta</b>.3
<b>PinDescuelgue   VAR porta</b>.5
<b>PinPolaridad    VAR porta</b>.4
<b>InZCD           VAR porta</b>.2
<b>PinDTMF         VAR portb</b>.7
<b>PinOffHook      VAR portb</b>.0


<b>Samples      VAR BYTE</b>[15] <b>BANK0 SYSTEM
SamplePTR    VAR BYTE     BANK0 SYSTEM
SamplesAddr  CON EXT
</b><font color="#008000">@SamplesAddr = Samples
</font><b>BitCount     VAR BYTE     BANK0 SYSTEM
ByteCount    VAR BYTE     BANK0 SYSTEM
FlagSample   VAR BIT
TMR2ON       VAR T2CON</b>.2



<b>NumSamples      VAR BYTE
ComIn           VAR BYTE

x               VAR BYTE            </b><font color="#000080"><i>'Counter Byte

</i></font><b>ASM
</b><font color="#008000">INT_LIST  macro    </font><font color="#000080"><i>; IntSource,        Label,  Type, ResetFlag?
        ;INT_Handler     RX_INT,      _Hablar,   PBP,  yes
        </i></font><font color="#008000">INT_Handler   TMR2_INT,       Sample,   ASM,  yes
        </font><font color="#000080"><i>;INT_Handler   TMR1_INT,  _ClockCount,   PBP,  yes
    </i></font><font color="#008000">endm
    INT_CREATE               </font><font color="#000080"><i>; Creates the interrupt processor
</i></font><b>ENDASM
</b><font color="#000080"><i>;@    INT_ENABLE  RX_INT     ; Enable Timer 1 Interrupts  
;@    INT_ENABLE  TMR1_INT     ; Enable Timer 1 Interrupts  
</i></font><font color="#008000">@    INT_ENABLE  TMR2_INT     </font><font color="#000080"><i>; Enable Timer 1 Interrupts  

</i></font><b>Config</b>:
        <b>trisb</b>.0=0
        <b>trisa</b>.5=1
        <b>trisa</b>.4=1
        <b>trisa</b>.2=1
        <b>trisb</b>.7=0
        <b>trisb</b>.3=0
        <b>trisa</b>.3=0         
        <b>CMCON </b>= 5
        <b>CMCON</b>.5 = 1         <font color="#000080"><i>'INVERTIDO        
        </i></font><b>VRCON </b>= %11101100
        <b>OPTION_REG </b>= %00000000 
        <b>PAUSE </b>500 : <b>LCDOUT </b>$FE,1 : <b>PAUSE </b>250
        <b>HSEROUT </b>[<font color="#FF0000">&quot;7&quot;</font>]
        <font color="#000080"><i>'gosub ResetTime
        'gosub StartTimer
        ;@    INT_DISABLE  TMR1_INT     ; Enable Timer 1 Interrupts                  
        ;@    INT_DISABLE  RX_INT     ; Enable Timer 1 Interrupts                  
        'HPWM 1,127,420
        </i></font><b>LOW PinDTMF
        HIGH PinOffHook
main1</b>:
        <b>GOSUB GetSamples
        WHILE FlagSample </b>= 0
        <b>WEND
GOTO main1


MAIN</b>:
        <b>HIGH PinActivar
        GOSUB GetSamples
        WHILE FlagSample </b>= 0 
        <b>WEND
        HSEROUT </b>[<font color="#FF0000">&quot;:&quot;</font>,10,13]
        <b>FOR x </b>= 0 <b>TO </b>14
              <b>HSEROUT </b>[<b>BIN8 Samples</b>[<b>x</b>],10,13]
        <b>NEXT x
        PAUSE </b>5000
<b>GOTO MAIN


</b><font color="#000080"><i>;----[Start getting the 120 samples]------------------------------------------
</i></font><b>GetSamples</b>:
    <b>FlagSample </b>= 0
    <b>SamplePTR </b>= <b>SamplesAddr
    ByteCount </b>= 15
    <b>BitCount  </b>= 8
    <b>PR2 </b>= 125 : <b>TMR2 </b>= 0 : <b>TMR2ON </b>= 1
<b>RETURN
    
</b><font color="#000080"><i>;----[TMR2 Handler]-----------------------------------------------------------
'ASM
'Sample
'    MOVE?BB  SamplePTR, FSR      ; Load FSR with pointer to array
'    MOVE?TT  CMCON,7, STATUS,C   ; Put sample in carry flag
'    rrf      INDF, F             ; Shift in the sample bit
'    decfsz   BitCount, F         ; Are all 8 bits in ?
'    goto     Int_Done            ;   NO, done for now
'    MOVE?CB  8, BitCount         ;   Yes, reset bitcount
'    incf     SamplePTR, F        ;     Point to next byte
'    decfsz   ByteCount, F        ; Are all 15 bytes done ?
'    goto     Int_Done            ;   NO, done for now
'    MOVE?CT  1, _FlagSample      ;   Yes, Indicate - Samples Complete
'    MOVE?CT  0, _TMR2ON          ; stop the timer
'Int_Done
'    btfsc    PORTA, 3            ; Toggle porta.3 to check Interruption on OScilloscope
'    goto Int_DNZ                 ; this really looks stupid.. longer than the rest of the
'    goto Int_DZ                  ; routine :P
'    Int_DZ
'    bsf      PORTA, 3
'    goto Int_Done1
'    Int_DNZ
'    bcf      PORTA, 3
'    Int_Done1
'    INT_RETURN
'ENDASM

</i></font><b>ASM
</b><font color="#008000">Sample
    MOVE?BB  SamplePTR, FSR      </font><font color="#000080"><i>; Load FSR with pointer to array
    </i></font><font color="#008000">MOVE?TT  CMCON,7, STATUS,C   </font><font color="#000080"><i>; Put sample in carry flag
    </i></font><font color="#008000">rrf      INDF, F             </font><font color="#000080"><i>; Shift in the sample bit
    </i></font><font color="#008000">decfsz   BitCount, F         </font><font color="#000080"><i>; Are all 8 bits in ?
    </i></font><font color="#008000">goto     Int_Done            </font><font color="#000080"><i>;   NO, done for now
    </i></font><font color="#008000">MOVE?CB  8, BitCount         </font><font color="#000080"><i>;   Yes, reset bitcount
    </i></font><font color="#008000">incf     SamplePTR, F        </font><font color="#000080"><i>;     Point to next byte
    </i></font><font color="#008000">decfsz   ByteCount, F        </font><font color="#000080"><i>; Are all 15 bytes done ?
    </i></font><font color="#008000">goto     Int_Done            </font><font color="#000080"><i>;   NO, done for now
    </i></font><font color="#008000">MOVE?CT  1, _FlagSample      </font><font color="#000080"><i>;   Yes, Indicate - Samples Complete
    </i></font><font color="#008000">MOVE?CT  0, _TMR2ON          </font><font color="#000080"><i>; stop the timer
</i></font><font color="#008000">Int_Done
    btfsc    CMCON,7            </font><font color="#000080"><i>; Toggle porta.3 to check Interruption on OScilloscope
    </i></font><font color="#008000">goto Int_DNZ                 </font><font color="#000080"><i>; this really looks stupid.. longer than the rest of the
    </i></font><font color="#008000">goto Int_DZ                  </font><font color="#000080"><i>; routine :P
    </i></font><font color="#008000">Int_DZ
    bcf      PORTA, 3
    goto Int_Done1
    Int_DNZ
    bsf      PORTA, 3
    Int_Done1
    INT_RETURN
</font><b>ENDASM
        
Hablar</b>:             <font color="#000080"><i>' FUNCION DE INTERRUPCION DEL PUERTO SERIE, RECIBE CORRECTAMENTE TODOS LOS DATOS
    </i></font><b>WHILE PIR1</b>.5  <font color="#000080"><i>' If RCIF is set, then read RCREG until it's clear
            </i></font><b>ComIn </b>= <b>RCREG
    WEND
    HSEROUT </b>[<b>ComIn</b>]
<font color="#008000">@ INT_RETURN

</font></code></pre><!--EndFragment--></body>
</html>

Then here is what i got from my Serial Port

11111110
00000011
11111000
00011111
11000000
01111111
00000000
11111110
00000111
11110000
00011111
10000000
11111111
00000000
11111100

My first impression GREAT!! but nono. Why? because The fecuency sampled is 420Hz, considering 0.000125 samples per second the period of the signal should be (1/420Hz)/0.000125uS = 19 samples aproximately. From what i am getting you can see that the period is around 15 samples, which means 533,3 Hz.

So i Though maybe the comparator is not working correctly...but... Another modification to the handler to make porta.3 follow the comparator output showed this picture. Its a DTMF code not the 420Hz i used as sample.

<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=2071&stc=1&d=1 191624484" width="160" height="98" />

So the Comp is working fine, and the sampling is being done a the correct frequency.
Here i took the 420Hz Comparator Output.

<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=2072&stc=1&d=119162493 3" width="160" height="98" />

Could it be... this is my last one... that something is wrong with the Handler... maybe between Byte changes a bit is missing? Obviously i have no idea of what you did there, BY THE WAY you will laugh at my ASM code to check things at porta.3 it has to be awful !!

. It works but is longer than the sampling part.

Hope you can give me any ideas.

**Darrel Taylor** · - 6th October 2007, 03:53

I think I see the confusion. It depends on how you line up the bytes.

For Binary arrays, they go from Right To Left.

Here's the results again ...<table border=1><tr><td align=center>
11111110
00000011
11111000
00011111
11000000
01111111
00000000
11111110
00000111
11110000
00011111
10000000
11111111
00000000
11111100
</td></tr><tr><td align=left>Correct way.<br>4 bytes Aligned right to left<br>
<pre> 00011111111110000000001111111110<br> |------ 19 -------|</pre>
</td></tr><tr><td>Wrong way.<br>4 bytes Aligned left to right <br>
<pre> 11111110000000111111100000011111<br> |---- 14 ----|</pre>
</td></tr></table>

HTH,

**Josuetas** · - 6th October 2007, 06:41

Doh!
Doh!
Doh!
A whole day looking a that

Darrel this is the next question (i havent even look through it), now i have an array of 15 bytes, but i see it has a pointer EXT, is there a way to point to each Bit of this array? i am going to do some math to each bit now and this would be useful.

Something else, this project is short in code Space since i only have 2k of my 628A (no16F88 around here) removing ReEnter could save me 150 instructions? the fact is this piece of code is like 780 words already and i havent done anything :P.

Anyway tomorrow i´ll do the short math, i´ll begin to cry when the word count reaches 1800.

**SteveB** · - 6th October 2007, 07:44

...is there a way to point to each Bit of this array?

Melanie has provided the answer. See 3. How can I reference a BIT in a BYTE ARRAY? in her very helpful Bits, Bytes Words and Arrays Post.

Thanks again Melanie.

SteveB

**Josuetas** · - 6th October 2007, 16:53

Thanks Steve i will be using it.

On the other hand.

Darrel this link
http://www.picbasic.co.uk/forum/show...php?t=3891#LAB ...

Its the post about the EXT modifier, i have been using it as a label to create tables in codespace in the past, BUT: right now i am using 628A wich doesn´t support READCODE instruction, can i still use it to create a table in codespace? if so (i guess i can) how can i read it?. It is a 14 bits x 120 Word, since the device is 14 bit i guess i could store each word in a memory space? kind of like the code to store strings in codespace? I havent been able to use the last one since i dont know how the data would be stored as Words and not as strings. Again ignorant about asm

.

This is my table

Code:

</i></font><b>ASM
</b><font color="#008000">DataTable
    DW 11111111111111b
    DW 01010111111111b
    DW 00000101010101b
    DW 00000001010101b
    DW 10101000000101b
    DW 11111000000000b
    DW 01111110000000b
    DW 01011110101000b
    DW 00000111101010b
    DW 10000011111010b
    DW 11100001111110b
    DW 11111001011111b
    DW 01111000010111b
    DW 00011100010111b
    DW 10000110000101b
    DW 10000110000001b
    DW 11100010100001b
    DW 01110011100000b
    DW 00111011111000b
    DW 00011101111000b
    DW 10001101111110b
    DW 11000100011110b
    DW 11100100011111b
    DW 01110010000111b
    DW 00111010000111b
    DW 10011011100001b
    DW 10001111100001b
    DW 11001101100001b
    DW 01100101111000b
    DW 00110000111000b
    DW 00110000011000b
    DW 10011010011110b
    DW 11001010001110b
    DW 01001110000110b
    DW 01100111000111b
    DW 00110111100111b
    DW 10110001100011b
    DW 11010001110001b
    DW 11001000111001b
    DW 01001100011001b
    DW 00101110011000b
    DW 10110110011100b
    DW 10110111001100b
    DW 11010011001110b
    DW 01001001100110b
    DW 01001001100111b
    DW 00101100110011b
    DW 10110100110011b
    DW 11110110110001b
    DW 11010010011001b
    DW 01000010011001b
    DW 00001011001100b
    DW 10101111001100b
    DW 10111101101100b
    DW 11110101100110b
    DW 01010100100110b
    DW 00000000110110b
    DW 00001010110011b
    DW 10101010010011b
    DW 11111111011011b
    DW 01111111011001b
    DW 01010101001001b
    DW 00000001001101b
    DW 10000000101100b
    DW 11101000100100b
    DW 11111010110110b
    DW 01111110110110b
    DW 00010110110010b
    DW 00000111010011b
    DW 10000011010011b
    DW 11100001001011b
    DW 01111001001001b
    DW 01111100101101b
    DW 00011100101101b
    DW 10000110101100b
    DW 11000110110100b
    DW 11100011110100b
    DW 01111011010010b
    DW 00111001010010b
    DW 10011101000010b
    DW 10001100001011b
    DW 11000100001011b
    DW 01100010101011b
    DW 00110010101101b
    DW 00111010111101b
    DW 10011011110101b
    DW 11001111010100b
    DW 11000101010100b
    DW 01100101010010b
    DW 00110000000010b
    DW 10111000001010b
    DW 10011010101011b
    DW 11001110101011b
    DW 01001111111111b
    DW 00100111111101b
    DW 00110001111101b
    DW 10110001010101b
    DW 11011000010100b
    DW 01001000000000b
    DW 01001110000000b
    DW 00100110100010b
    DW 10110110101010b
    DW 11110011101010b
    DW 11010011111111b
    DW 01001001111111b
    DW 00001101011111b
    DW 10101100010101b
    DW 10110100000101b
    DW 11110110000101b
    DW 01010010000000b
    DW 01001011100000b
    DW 00001011101010b
    DW 10101101111010b
    DW 11111101111010b
    DW 11110100111111b
    DW 01010000011111b
    DW 00000010010111b
    DW 10001010000101b
    DW 10101010000101b
    DW 11111111100001b
</font><b>ENDASM

**mister_e** · - 6th October 2007, 17:45

There's still the 128 Byte EEPROM on board option... but it's way too limited.

LOOKUP(2)?

External EEPROM?

**Josuetas** · - 6th October 2007, 17:51

Eproom will store the strings of my LCD, and i would need 256 Bytes to store this table in Eproom vs the posible 120 "SemiWords" of codeSpace.

Thanks for your concern

And.. no external component.. i am looking for a low budget device here, also low Real State.

**Archangel** · - 7th October 2007, 00:40

Originally Posted by Josuetas

Doh!
Doh!
Doh!
A whole day looking a that

Darrel this is the next question (i havent even look through it), now i have an array of 15 bytes, but i see it has a pointer EXT, is there a way to point to each Bit of this array? i am going to do some math to each bit now and this would be useful.

Something else, this project is short in code Space since i only have 2k of my 628A (no16F88 around here) removing ReEnter could save me 150 instructions? the fact is this piece of code is like 780 words already and i havent done anything :P.

Anyway tomorrow i´ll do the short math, i´ll begin to cry when the word count reaches 1800.

Hi Josuetas,
16F648A is the same chip with 2X the codespace and similar price, uses same data sheet too, but you get 4K instead of 2K.
JS

**Josuetas** · - 7th October 2007, 02:21

You cant imagine how nice it would be for me to find one around here!

The fact is that 648A is sold out, today i went looking for it with no success.

Not finding supplies around here really makes me sad.

So it seems i will have to upgrade the uC to something like 876A, easily found here. Though more expensive. Its sad because 876A is not improving anything for me, maybe just the speed, but even there i will have to use an external OSC ($$).

What i really need here is 16F88, int OSC 8 Mhz always better than 4 Mhz and 4K memory should be enough.

I am from Colombia South America by the way... wanna switch?

Leaving this discussion Aside... i am not done with 628A you know? i havent reached 1800 words (where i will cry) right now i just need to store the table in code space... do you know the way? the solutions about this given in the forum use READCODE wich 628A cant execute.

**Archangel** · - 7th October 2007, 05:55

Aside from lack of PICs, oh and that thing about the cartels . . .I hear Colombia has many nice things, great coffee, emeralds, cattle ranches, I knew a girl from there who went back and became Miss Colombia, and she was cute too !, but no I am too old to make that big of a change. I did not know from where you are hailing, will U S Suppliers not ship to Colombia? I do not know of any techknowlegy restrictions regarding shipping to your Country, You might check with www.Mouser.com

**Josuetas** · - 7th October 2007, 07:23

No complains... it would take like two weeks for that pic to arrive here, and would cost me around 45 dolars (Shipping). Its not that i cant find pics here... there are just not all the ones i want.. switching to 876 its possible but... we are forgetting the real problem... nOT THE PIC!!... i need to store and retrieve that table!!! it has to be pretty simple.. REMEMBER 628 still has free code space.

By the way every one seems to know someone from Colombia... i´ve had more foreign Girlfriends than girls from here.. although yes YES... women here are hot hot. I was kidding about switching i´ve been to many places and i wouldnt.... but the invite is still on the table you MUST visit us

... someday...

Thread: Troubled with Instant Ints and TMR2

Thread Tools

Search Thread

Display

Hybrid View

Ok it took me more than a couple of hours

Doh!

Thanks for that link Steve

Hi! Thanks Eproom for other stuff

Thanks Joe just need to store table in codespace.

Sure you are right

Members who have read this thread : 0

Bookmarks

Bookmarks

Posting Permissions