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Problem to Comunicate with I2C Bs2P40 I2C to MAX6955 (Dispa... — Parallax Forums

Problem to Comunicate with I2C Bs2P40 I2C to MAX6955 (Dispa...

ArchiverArchiver Posts: 46,084
edited 2003-02-22 00:35 in General Discussion
What Stamp pins are you using for SDA and SCL? If you're using pins on the
AUX group you must put in an AUXIO before your I2CIN or I2COUT statements?.

I just looked at the MAX6955 spec sheet and it shows pin 4 as SDA and pin 5
as SCL. Also remember that on the BS2p, you can only use pins 0 & 1 or 8 & 9
(on either the MAIN or AUXIO groups) for I2CIN and I2COUT. Please consult
the manual or help file.

-- Jon Williams
-- Parallax

In a message dated 2/21/2003 5:34:33 PM Central Standard Time,
dtrujillo_riese@c... writes:

> I have a BS2p40 conecting with MAX6955 into pin 6 (SDA) and Pin7 (SCL) and
> the MAX6955 have adress 00 (%11000000 (write) or %11000001 (read)). then,
> in fact, i put AD0 and AD1 to gnd.... I don't know, why don't my Bs2p40
> conect to MAX6955? When I try to read, in the variable, you can see
> %11111111 and I sure that my parallax isn't write the MAX6955, because I
> tried to put MAX6955 in Dysplay TEST.. ANd I don't know, What is the
> Problem?
>
> THe MAX6955 is the 2-wire, 2,7V to 5.5V LED DISPLAY DRIVER with I/O
> Expander and Key Scan.. This is the new chip to MAXIM...
> Anyone, help me?



[noparse][[/noparse]Non-text portions of this message have been removed]

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-02-21 23:54
    Posting your code (just the I2C portion of it) would be helpful to those of
    us that might assist you.

    -- Jon Williams
    -- Parallax

    In a message dated 2/21/2003 5:46:27 PM Central Standard Time,
    dtrujillo_riese@c... writes:

    > I have a BS2p40 conecting with MAX6955 into pin 6 (SDA) and Pin7 (SCL) and
    > the MAX6955 have adress 00 (%11000000 (write) or %11000001 (read)). then,
    > in fact, i put AD0 and AD1 to gnd.... I don't know, why don't my Bs2p40
    > conect to MAX6955? When I try to read, in the variable, you can see
    > %11111111 and I sure that my parallax isn't write the MAX6955, because I
    > tried to put MAX6955 in Dysplay TEST.. ANd I don't know, What is the
    > Problem?
    >
    > THe MAX6955 is the 2-wire, 2,7V to 5.5V LED DISPLAY DRIVER with I/O
    > Expander and Key Scan.. This is the new chip to MAXIM...
    > Anyone, help me?
    >
    > I appreciate your prompt response
    >
    > Best Regards
    >
    > Eng. Damian Trujillo G
    > Venezuela, Caracas
    > JAHEL S.A.



    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2003-02-22 00:35
    Thank Jon Willians

    I was using pin 6 (SDA)and 7 (SDL), I had a misstake with this pins.......
    I try to cahnge to pin 8 and 9.....

    I appreciate your email response

    Best Regards

    Eng. damian Trujillo
    Venezuela, Caracas


    Mensaje Original

    De: jonwms [noparse]/noparse][url=http://forums.parallaxinc.com/group/basicstamps/post?postID=-2ydlyNoB2z9LrK5_wAaKtQqxdgmFxLAKEeYvFo4GHYGte2K8oPSFpbyxxWHmMHLARETY1V_K7H6]jonwms@a...[/url
    Para: basicstamps@yahoogroups.com [noparse]/noparse][url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Whi9uwCU8PQgStMArZlG2e5ojUHWL_aR5ns8N5h2ofWCESFH9vj321_hZr5qjLzZOuO9MGQYQRqwiNe4KmZmBGA]basicstamps@yahoogroups.com[/url
    Cc:
    Asunto: Re: [noparse][[/noparse]basicstamps] Problem to Comunicate with I2C Bs2P40 I2C to
    MAX6955 (Dispa...
    Fecha: 21/02/2003 19:44:02
    Mensaje:


    What Stamp pins are you using for SDA and SCL? If you're using pins
    on the
    AUX group you must put in an AUXIO before your I2CIN or I2COUT statements?.

    I just looked at the MAX6955 spec sheet and it shows pin 4 as SDA and pin 5
    as SCL. Also remember that on the BS2p, you can only use pins 0 & 1 or 8 &
    9
    (on either the MAIN or AUXIO groups) for I2CIN and I2COUT. Please consult
    the manual or help file.

    -- Jon Williams
    -- Parallax

    In a message dated 2/21/2003 5:34:33 PM Central Standard Time,
    dtrujillo_riese@c... writes:

    > I have a BS2p40 conecting with MAX6955 into pin 6 (SDA) and Pin7 (SCL) and
    > the MAX6955 have adress 00 (%11000000 (write) or %11000001 (read)). then,
    > in fact, i put AD0 and AD1 to gnd.... I don't know, why don't my Bs2p40
    > conect to MAX6955? When I try to read, in the variable, you can see
    > %11111111 and I sure that my parallax isn't write the MAX6955, because I
    > tried to put MAX6955 in Dysplay TEST.. ANd I don't know, What is the
    > Problem?
    >
    > THe MAX6955 is the 2-wire, 2,7V to 5.5V LED DISPLAY DRIVER with I/O
    > Expander and Key Scan.. This is the new chip to MAXIM...
    > Anyone, help me?



    [noparse][[/noparse]Non-text portions of this message have been removed]


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