NS73M fm radio trasmitter

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  1. - 8th February 2009, 04:36 #1
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    Joe,

    I appreciate all the help and suggestions.

    Here is my code, a schematic, and a photo of my setup.

    I have tried all kinds of things, and my underlying suspicion isnt that I am doing something wrong. I am just not finished with what is right.

    I have rewritten my code more similar to Boris' snippets, and his seems to work, heh. But mine still does not. Yet.


    My Configs are set as follows:

    __config _HS_OSC & _WDT_ON & _LVP_OFF & _CP_OFF & _WRT_OFF & _CPD_OFF & _BODEN_ON & _PWRTE_ON

    Code:
    '''''''''''''''''''''''''''''''''''''''
'''''''''''''''''''''''''''''''''''''''
''   NS73M Control Test Environment  ''
'''''''''''''''''''''''''''''''''''''''
'''''''''''''''''''''''''''''''''''''''
' We are using a PIC 16F877A
'
ADCON1=%00000111
Include "ModeDefs.Bas"
DEFINE OSC 4
TRISB=0
DEFINE LCD_DREG	PORTA	'Define PIC port used for LCD Data lines
DEFINE LCD_DBIT	0		'Define first pin of portb connected to LCD DB4
DEFINE LCD_RSREG PORTA	'Define PIC port used for RS line of LCD
DEFINE LCD_RSBIT 4		'Define Porta pin used for RS connection
DEFINE LCD_EREG	PORTB	'Define PIC prot used for E line of LCD
DEFINE LCD_EBIT	0		'Define PortB pin used for E connection
DEFINE LCD_BITS	4		'Define the 4 bit communication mode to LCD
DEFINE LCD_LINES 2		'Define using a 2 line LCD

NS_CK VAR PORTB.1	' I2C Clock Pin
NS_DA VAR PORTB.2	' I2C Data Pin
NS_CON VAR BYTE		' I2C Device (the NS73M) Control Address/ReadWrite Value
NS_REG VAR BYTE		' NS73M Register Address
NS_VAL VAR BYTE		' NS73M Register Value

NS_CON = %11001100	' Value of NS73M Address, with "Write" Bit

NS_REG=$0E:NS_VAL=$05:GOSUB WRITEDAMMIT ' Reset the chip right off...  They said to.
NS_REG=$01:NS_VAL=$B4:GOSUB WRITEDAMMIT ' Pilot On, Forced Subcarrier On
NS_REG=$02:NS_VAL=$07:GOSUB WRITEDAMMIT ' Full (2mw) Power, Unlock Detect On,
NS_REG=$03:NS_VAL=$58:GOSUB WRITEDAMMIT ' Lower Byte of Freq Address in Hex
NS_REG=$04:NS_VAL=$2A:GOSUB WRITEDAMMIT ' Upper Byte of Freq Address in Hex
NS_REG=$08:NS_VAL=$18:GOSUB WRITEDAMMIT ' CEX Band = 3 (For Now. Different Bands for Different Freq's)
NS_REG=$00:NS_VAL=$A1:GOSUB WRITEDAMMIT ' Xmtr RF On, 200mv input level for 100% Modulation
NS_REG=$0E:NS_VAL=$05:GOSUB WRITEDAMMIT ' Another Reset
NS_REG=$06:NS_VAL=$1E:GOSUB WRITEDAMMIT ' Set the Charge Pumps, whatever Charge Pumps are...
GOTO LCDSTUFF

WRITEDAMMIT:
I2CWRITE NS_DA,NS_CK,NS_CON,NS_REG,[NS_VAL] ' I2CWRITE Command. Supposed to work.
PAUSE 10 ' Don't know if this is necessary, but everyone writing to EEProms use it, I figured it couldn't hurt.
RETURN

LCDSTUFF:
LCDOUT $FE, 1
LCDOUT $FE, 2
PAUSE 500
LCDOUT $FE, $80
LCDOUT "  Are We" 
LCDOUT $FE, $C0
LCDOUT "Transmitting ??"
PAUSE 1000

THEEND:
END






    I know the chip in the schematic says "16F84AP". disregard that. In reality, it is a 16F877A; the pin connections are the same still.

    Any ideas would be a godsend. Thanks!

    Cheers!

    SmugWimp
    Last edited by SmugWimp; - 8th February 2009 at 04:53.
  2. - 8th February 2009, 09:47 #2
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    Have you pulled up the IIC pin #8
    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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  3. - 8th February 2009, 12:25 #3
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    It does not have a resistor on it, but "IIC" on the NS73M Board is tied to +3.3v, yes.

    Both the I2C Clock and Data lines are pulled to +3.3v with 1Kohm resistors. I have tried larger values, and it makes no difference.

    cheers!

    SmugWimp
    Last edited by SmugWimp; - 8th February 2009 at 12:27.
  4. - 8th February 2009, 16:04 #4
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    XT_OSC might be better for a 4MHz crystal, and BODEN_OFF would help when operating
    below the Brown-Out Reset Voltage, but I think the primary show-stopper is trying to run
    the non LF version 877A below the minimum operating voltage.

    The LF part can operate on 2 to 5.5V. The non LF needs 4 to 5.5V. Check the Electrical
    Specifications section in your datasheet.

    Brown-Out reset on the non LF part can be anywhere from 3.65V, 4.0V or 4.35V.
    Regards,

    -Bruce
    tech at rentron.com
    http://www.rentron.com
  5. - 9th February 2009, 07:07 #5
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    Bruce,

    Thanks for the info. Hadn't thought of that.

    I did a slight rewire to provide +5v to LCD and 877a, and +3.3v to NS73M only.

    The 1K Pull up resistors for I2 Data/Clock are also at +5v.

    XT_OSC and BODEN_OFF have been implemented on my fuses.

    However, still no success.

    I appreciate everyone's support and suggestions!! I will keep plugging away. Gotta be me... something...

    Cheers!

    SmugWimp
    Last edited by SmugWimp; - 9th February 2009 at 07:37.
  6. - 9th February 2009, 14:23 #6
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    Run the PIC at 5V and just build this simple interface circuit shown in section 2.3.

    http://www.standardics.nxp.com/suppo...df/an97055.pdf
    Regards,

    -Bruce
    tech at rentron.com
    http://www.rentron.com
  7. - 9th February 2009, 14:32 #7
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    Bruce,

    Cool!!! Funny, I saw this circuit at Mike Yancy's Website while snooping around for stuff. I thought it was because he was running an Arduino. Guess that points out more ignorance on my part!

    I'll have to run into Akihabara to get these parts; nothing like that in my stock. I'll let you know what I find, but I really really appreciate the heads up on this!!

    Cheers!

    SmugWimp
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