NS73M fm radio trasmitter

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  1. - 3rd February 2009, 12:23 #1
    SmugWimp's Avatar
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    I guess I am missing some elementary issues, but I cannot seem to figure out why I cannot get this to work.

    Here is a sample of my code:

    Code:
    REM Above this is just LCD and button setups...

NS_CK VAR PORTC.1
NS_DA VAR PORTC.2

FREQ VAR WORD 'REM Consisting of FREQ.1 and FREQ.2 (Hi/Lo Byte)
MYREG VAR BYTE 'REM Register of NS73M
MYVAL VAR BYTE 'REM Value for register in NS73M
MYCON VAR BYTE 'REM Control Value for NS73M

START:
'REM The Theory is that we setup all parameters, then turn it on.

MYCON = %11001100 'REM Setup Control Address for NS73M
PAUSE 100 'REM Breathe a moment; let the chip get settled...

I2CWRITE NS_DA,NS_CK,MYCON,$0E,[$05] 'REM SOFTWARE RESET NS73M Chip
PAUSE 100
I2CWRITE NS_DA,NS_CK,MYCON,$01,[$B4] 'REM Pilot On, Subcarrier On
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$02,[$07] 'REM 2mw Power, Unlock Detect ON
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$08,[$1A] 'REM CEX Band 2
PAUSE 10
'REM Again, theory is that I am transmitting on 88.5MHz, as per datasheet...
I2CWRITE NS_DA,NS_CK,MYCON,$03,[$58] 'REM Frequency; Lower Byte
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$04,[$2A] 'REM Frequency; Upper Byte
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$00,[$A3] 'REM Power, 200mv Audio, 75us PE
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$0E,[$05] 'REM SOFTWARE RESET NS73M
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$06,[$1E] 'REM Charge Pumps
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$0E,[$05] 'REM SOFTWARE RESET NS73M
PAUSE 10

REM Just a note to let me know it got through the code unscathed...

	LCDOUT $FE, 1
	LCDOUT $FE, 2
	PAUSE 500
	LCDOUT $FE, $80
	LCDOUT "Transmitting?" 
	LCDOUT $FE, $C0
	LCDOUT "  supposedly..."
	PAUSE 1000

END
    At first I was trying this with a 16F84A, and moved to a 16F877A just to make sure there was nothing wrong with my chips. I get the same results; nothing.

    This is my first attempt at I2C communications, so I am not certain what, if any, feedback I can expect. My current feedback is nothing works, lol!

    Any pointers on where my code is lacking, or erroneous, would be greatly appreciated!

    Cheers!

    SmugWimp
  2. - 4th February 2009, 09:32 #2
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    Hold the phone folks; I think I may have a hardware issue. I almost hope so, anyway. heh.

    BBIAF...

    SmugWimp
  3. - 4th February 2009, 11:00 #3
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    No Such Luck. What I thought was a miswiring turned out to be correct. But I did remove some (as of yet) unneeded wires for the buttons, until I get the rest of this moving along. It doesnt work any better, but it is easier to see.

    Here is the latest rendition of code:

    Code:
    REM LCD PIN Assignments above...

NS_DA VAR PORTB.1
NS_CK VAR PORTB.2
MYCON VAR BYTE 'REM Control Value for NS73M

START:
'REM The Theory is that we setup all parameters, then turn it on.
MYCON = $CC 'REM Setup Control Address for NS73M
PAUSE 100 'REM Breathe a moment; let the chip get settled...

REM I2CWRITE DATAPIN,CLOCKPIN,CONTROLADDRESS,PORTADDRESS,[DATAINBRACKETS]{, OPTIONALJUMPTOLABEL}

I2CWRITE NS_DA,NS_CK,MYCON,$0E,[$05], BOOHA 'REM SOFTWARE RESET NS73M Chip
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$00,[$A0] 'REM Set it up, dont turn it on yet...
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$01,[$B4] 'REM Pilot On, Subcarrier On
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$02,[$07] 'REM 2mw Power, Unlock Detect ON
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$03,[$58] 'REM Frequency; Lower Byte
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$04,[$2A] 'REM Frequency; Upper Byte
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$08,[$1A] 'REM CEX Band 2
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$00,[$A1] 'REM Ok, Turn it on...
PAUSE 10
I2CWRITE NS_DA,NS_CK,MYCON,$0E,[$05] 'REM SOFTWARE RESET NS73M Chip
PAUSE 100
I2CWRITE NS_DA,NS_CK,MYCON,$06,[$1E] 'REM Charge Pump
PAUSE 10
LCDOUT $FE, 1
LCDOUT $FE, 2
PAUSE 500
LCDOUT $FE, $80
LCDOUT "Transmitting?" 
LCDOUT $FE, $C0
LCDOUT "  supposedly..."
PAUSE 1000
GOTO THEEND

BOOHA:
	LCDOUT $FE, 1
	LCDOUT $FE, 2
	PAUSE 500
	LCDOUT $FE, $80
	LCDOUT "No ACK" 
	LCDOUT $FE, $C0
	LCDOUT ":("
	PAUSE 1000
	GOTO THEEND

THEEND:
END
    Interestingly enough, One of the reasons I thought it was a hardware failure, was I could remove one, or both of the I2C lines and still not get an error (evidenced by the optional jump label on the first I2CWRITE command, to reset the NS73M). However, if I "swapped" the lines, then I DID get a "No ACK" error. Weird. I still dont understand that. But it is wired correctly.

    I moved back to a 16F84A because it wasnt the problem and I have a bunch that I want to use.

    On the 16F84A, Pins A0-4 are used for data and RS for the LCD. Pin B0 is the E pin for the LCD, B1 is the I2C Data line, and B2 is the I2C Clock.

    On the SparkFun board, Line In is attached to my Ipod, IIC is attached to +3.3v, LA is attached to Ground, Data to B1, Clock to B2, TEB not connected, VCC to +3.3v and Ground to Ground.

    Again, It seems like it "should" work, but alas it does not. Any ideas would be greatly appreciated!

    Cheers!

    SmugWimp
  4. - 4th February 2009, 15:23 #4
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    Just a guess here but the NS73M is not 5V tolerant. The pins connected to the PIC should be level compensated to match the logic levels required for the NS73M or a 3V PIC should be used.

    I use the NS73M quite reliably but not in I2C mode and my routines are written in Swordfish so I can't really comment on your code. Sorry I can't help more.....

    Tom
    Tom
  5. - 5th February 2009, 02:41 #5
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    Tom, Thanks!

    Yeah, I have the NS73M on the end of a 3.3v regulator, and all but the LCD is on 3.3v.

    If I cant get I2C working, I guess I will go with the 3 wire... but was hoping not to have to use that extra pin...

    So goes life...

    Cheers!

    SmugWimp
  6. - 5th February 2009, 13:42 #6
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    Quote Originally Posted by Tom Estes View Post
    Just a guess here but the NS73M is not 5V tolerant. The pins connected to the PIC should be level compensated to match the logic levels required for the NS73M or a 3V PIC should be used.

    I use the NS73M quite reliably but not in I2C mode and my routines are written in Swordfish so I can't really comment on your code. Sorry I can't help more.....

    Tom
    If you want post the code.
    Thanks
    http://www.lesvoselectronic.com
    http://www.lesvoselectronics.com
  7. - 5th February 2009, 18:23 #7
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    Hello SmugWimp,
    16F877a has a bunch of analog stuff, some of it on portC, including C.1 and you must disable to send I²C as that data is digital. How about posting the whole code including the config statements. I would read sec. 4.3 of the data sheet, it explains about using portC in I²C communications and which pins to use. I do not know how much it affects the operation, but portC has Schmitt trigger input buffers. It may be because of that, it will only work on the pins Microchip has designated as I²C , it is certainly worth the effort to check. BTW, I do not see the jump label or a subroutine to be jumped to, must be in the unposted code . . . Have you attempted to try this on PortB ? No S. T. on the inputs there. here is a link of someone who got I²C to work : http://www.picbasic.co.uk/forum/showthread.php?t=5632 Looks like I2CWRITE is not a stand alone statement, looks like it requires all the registers to be set as the datasheet specifys . . . The manual gives the impression this is a bit banged solution, sort of looks like it is not.
    Last edited by Archangel; - 5th February 2009 at 19:24.
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  8. - 7th February 2009, 20:30 #8
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    Look at this thread it discusses using I²C w 3.3v . . . http://www.picbasic.co.uk/forum/show...9879#post69879 I noticed a comment re: not using schmitt trigger inputs . . .
    If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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