MPC5200 - Problem with PSC mode

MPC5200 - Problem with PSC mode

[Moloko Vellocet]

Hi, I'm configuring a MPC5200 in PSC3 mode to communicate with a
telephony board that send information to the MPC5200 continuously. In
the osciloscope I see the signals comming via RX pin, but when I read
RX buffer it doesn't contain anything and when I write in the TX
buffer the flags show that buffer is not empty, but in the osciloscope
I don't see any signal in TX pin. I can't enable the interrupt mode
too.

Can anyone help me?

Part of the configuration code:

out_8(&psc->command, MPC5xxx_PSC_TX_DISABLE | MPC5xxx_PSC_RX_DISABLE);

val32 =3D in_be32(&gpio->port_config);
val32 &=3D ~0x700;
val32 |=3D 0x600;
out_be32(&gpio->port_config, val32);

out_8(&psc->command, MPC5xxx_PSC_RST_RX |
         MPC5xxx_PSC_RST_TX |
         MPC5xxx_PSC_SEL_MODE_REG_1 |
         MPC5xxx_PSC_RST_ERR_STAT);

out_be16(&psc->mpc5xxx_psc_imr, 0);

out_be16(&psc->rfalarm, 0x0004);

out_be16(&psc->tfalarm, 0x0004);

out_be32(&psc->sicr, 0x221000);

out_8(&psc->command, MPC5xxx_PSC_RST_RX |
         MPC5xxx_PSC_RST_TX |
         MPC5xxx_PSC_SEL_MODE_REG_1 |
         MPC5xxx_PSC_RST_ERR_STAT);

spin_lock_irqsave(&mpc5xxx_serial_lock, my_flags);

val16 =3D in_be16(&psc->mpc5xxx_psc_imr);

val16 =3D MPC5xxx_PSC_IMR_TXRDY | MPC5xxx_PSC_IMR_RXRDY;

out_be16(&psc->mpc5xxx_psc_imr, val16);

spin_unlock_irqrestore(&mpc5xxx_serial_lock, my_flags);

out_8(&psc->command, MPC5xxx_PSC_RX_ENABLE | MPC5xxx_PSC_TX_ENABLE);


So.. with this I tried to read the RX and write in TX buffer.




Thank you.




--
_______________________________
Allann J. O. Silva

"I received the fundamentals of my education in school, but that was
not enough. My real education, the superstructure, the details, the
true architecture, I got out of the public library. For an
impoverished child whose family could not afford to buy books, the
library was the open door to wonder and achievement, and I can never
be sufficiently grateful that I had the wit to charge through that
door and make the most of it." (from I. Asimov, 1994)

RE: MPC5200 - Problem with PSC mode

[Zeitler, Nathan]

Hi Allann,

> out_8(&psc->command, MPC5xxx_PSC_RST_RX |
>          MPC5xxx_PSC_RST_TX |
>          MPC5xxx_PSC_SEL_MODE_REG_1 |
>          MPC5xxx_PSC_RST_ERR_STAT);

It looks like you're trying to do too many things at once here. =20
ORing SEL_MODE_REG_1 and RST_ERR_STAT together=20
forms a completely different command in the Command=20
register.  You may want to break that into two lines of code. =20
Give that a try!

Open Systems International, Inc.=20
Nathan Zeitler
Hardware Engineer
3600 Holly Lane North, Suite 40
Minneapolis, MN 55447-1286
Phone: 763 551 0559
Fax: 763 551 0750
E-mail: nzeitler@osii.com

Re: MPC5200 - Problem with PSC mode

[Moloko Vellocet]

Thank you.

But the error persists, I can't get data stored in RX pin and write
data to TX pin.

Registers like 'rfnum' are with value '0' (zero).

I think that RX and TX has not been enabled.


On 1/30/06, Zeitler, Nathan <nzeitler@osii.com> wrote:
> Hi Allann,
>
> > out_8(&psc->command, MPC5xxx_PSC_RST_RX |
> >          MPC5xxx_PSC_RST_TX |
> >          MPC5xxx_PSC_SEL_MODE_REG_1 |
> >          MPC5xxx_PSC_RST_ERR_STAT);
>
> It looks like you're trying to do too many things at once here.
> ORing SEL_MODE_REG_1 and RST_ERR_STAT together
> forms a completely different command in the Command
> register.  You may want to break that into two lines of code.
> Give that a try!
>
> Open Systems International, Inc.
> Nathan Zeitler
> Hardware Engineer
> 3600 Holly Lane North, Suite 40
> Minneapolis, MN 55447-1286
> Phone: 763 551 0559
> Fax: 763 551 0750
> E-mail: nzeitler@osii.com
>


--
_______________________________
Allann J. O. Silva

"I received the fundamentals of my education in school, but that was
not enough. My real education, the superstructure, the details, the
true architecture, I got out of the public library. For an
impoverished child whose family could not afford to buy books, the
library was the open door to wonder and achievement, and I can never
be sufficiently grateful that I had the wit to charge through that
door and make the most of it." (from I. Asimov, 1994)

Re: MPC5200 - Problem with PSC mode

[Zeitler, Nathan]

Allann,

Hmm, yes.  In addition, these lines looks suspect:

> val32 =3D in_be32(&gpio->port_config);
> val32 &=3D ~0x700;
> val32 |=3D 0x600;
> out_be32(&gpio->port_config, val32);

I don't have the register's header file in front of me, but I'm
pretty sure this refers to MBAR+0xb00.  If that's the case,=20
you seem to be configuring the port to be in CODEC mode=20
and not UART mode.  Try this instead:

val32 =3D in_be32(&gpio->port_config);
val32 &=3D ~0xf00;
val32 |=3D 0x400;
out_be32(&gpio->port_config, val32);

You may want to refer to the MPC5200 manual.  Page 15-43
has a nice sequence you can go through to configure a port
to be a UART.

Open Systems International, Inc.=20
Nathan Zeitler
Hardware Engineer
3600 Holly Lane North, Suite 40
Minneapolis, MN 55447-1286
Phone: 763 551 0559
Fax: 763 551 0750
E-mail: nzeitler@osii.com