I've a dual processor board with NE64 and MSP430F149; they are supposed to communicate using SPI, with MSP430 as the slave. The Msp430 uses USART1 as the SPI and I programmed the USART1 registers for interrupt-enabled SPI communication as an SPI slave (Global interrupts are also enabled). However, the MSP430 is never interrupted even though the NE64 keeps sending data. I've kept the baud rate quite low and for now I'm interested in seeing communication being established more than the correctness of the data. Where may I've gone wrong? Thank you. PS - I've also checked the clock(around 7kHz), data and STE(active low during data transfers) signals on an oscilloscope and didn't notice anything out of place. Regards, Sudhakar
Problems with MSP430 as slave in SPI mode
Started by ●February 25, 2005
Reply by ●February 25, 20052005-02-25
--- In msp430@msp4..., "sudhakar_b_v" <venkata.bulusu@h...>
wrote:
>
> I've a dual processor board with NE64 and MSP430F149; they are
> supposed to communicate using SPI, with MSP430 as the slave. The
> Msp430 uses USART1 as the SPI and I programmed the USART1 registers
> for interrupt-enabled SPI communication as an SPI slave (Global
> interrupts are also enabled). However, the MSP430 is never
> interrupted even though the NE64 keeps sending data. I've kept the
> baud rate quite low and for now I'm interested in seeing
> communication being established more than the correctness of the
> data. Where may I've gone wrong? Thank you.
>
> PS - I've also checked the clock(around 7kHz), data and STE(active
> low during data transfers) signals on an oscilloscope and didn't
> notice anything out of place.
>
> Regards,
> Sudhakar
The MSP430 is now getting regular interrupts; I had made a small
error in the code, my apologies. However, each time it's interrupted,
the data read is 0xFFFF, though the data on the pin seems ok. Any
help is appreciated. Thank you.
Regards,
Sudhakar
Reply by ●February 25, 20052005-02-25
Have you checked clock phase and polarity configurations, Sudhakar? You
have to tell MSP in what edge of the clock signal it should sample data.
Regards,
Adriano.
sudhakar_b_v wrote:
>
> --- In msp430@msp4..., "sudhakar_b_v" <venkata.bulusu@h...>
> wrote:
>
>>I've a dual processor board with NE64 and MSP430F149; they are
>>supposed to communicate using SPI, with MSP430 as the slave. The
>>Msp430 uses USART1 as the SPI and I programmed the USART1 registers
>>for interrupt-enabled SPI communication as an SPI slave (Global
>>interrupts are also enabled). However, the MSP430 is never
>>interrupted even though the NE64 keeps sending data. I've kept the
>>baud rate quite low and for now I'm interested in seeing
>>communication being established more than the correctness of the
>>data. Where may I've gone wrong? Thank you.
>>
>>PS - I've also checked the clock(around 7kHz), data and STE(active
>>low during data transfers) signals on an oscilloscope and didn't
>>notice anything out of place.
>>
>>Regards,
>>Sudhakar
>
>
> The MSP430 is now getting regular interrupts; I had made a small
> error in the code, my apologies. However, each time it's interrupted,
> the data read is 0xFFFF, though the data on the pin seems ok. Any
> help is appreciated. Thank you.
>
> Regards,
> Sudhakar
>
>
>
>
>
> .
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
Reply by ●February 25, 20052005-02-25
Hi Adriano
Thanks for your reply. Yeah, I've configured the registers so that
the clock is active high and there's no phase delay. Here's the code -
#define RESET_USART1() U1CTL |= SWRST
#define RELEASE_USART1() U1CTL &= ~SWRST
#define ENABLE_SPI1() ME2 |= USPIE1
#define DISABLE_SPI1() ME2 &= ~USPIE1
char rxBuf;
void initSPI1()
{
WDTCTL = WDTPW+WDTHOLD;
/* Configure port5 */
P5SEL |= 0x0e;
P5DIR |= 0x02;
U1CTL = SWRST;
U1CTL |= CHAR; // CHAR 8-bit Data
U1CTL |= SYNC; // SYNC SPI Mode.
U1CTL &= ~MM; // Slave Mode.////
U1TCTL = 0x00;
U1RCTL = 0x00;
U1MCTL=0x00; // This should be zero always.
rxBuf = U1RXBUF;
U1TXBUF = 0x22;
ENABLE_SPI1();
RELEASE_USART1();
IE2 |= URXIE1+UTXIE1;
for(i=0xfff;i>0;i--);
{
}
_EINT();
}
--- In msp430@msp4..., Adriano <adriano@n...> wrote:
>
> Have you checked clock phase and polarity configurations, Sudhakar?
You
> have to tell MSP in what edge of the clock signal
it should sample
data.
>
> Regards,
> Adriano.
>
> sudhakar_b_v wrote:
> >
> > --- In msp430@msp4..., "sudhakar_b_v"
<venkata.bulusu@h...>
> > wrote:
> >
> >>I've a dual processor board with NE64 and MSP430F149; they are
> >>supposed to communicate using SPI, with MSP430 as the slave. The
> >>Msp430 uses USART1 as the SPI and I programmed the USART1
registers
> >>for interrupt-enabled SPI communication as
an SPI slave (Global
> >>interrupts are also enabled). However, the MSP430 is never
> >>interrupted even though the NE64 keeps sending data. I've kept
the
> >>baud rate quite low and for now I'm
interested in seeing
> >>communication being established more than the correctness of the
> >>data. Where may I've gone wrong? Thank you.
> >>
> >>PS - I've also checked the clock(around 7kHz), data and STE
(active
> >>low during data transfers) signals on an
oscilloscope and didn't
> >>notice anything out of place.
> >>
> >>Regards,
> >>Sudhakar
> >
> >
> > The MSP430 is now getting regular interrupts; I had made a small
> > error in the code, my apologies. However, each time it's
interrupted,
> > the data read is 0xFFFF, though the data on
the pin seems ok. Any
> > help is appreciated. Thank you.
> >
> > Regards,
> > Sudhakar
> >
> >
> >
> >
> >
> > .
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
Reply by ●February 25, 20052005-02-25
Your procedure is ok, Sudhakar, but it seems that you have configured
UCLK1 pin as output. As the MSP is a slave, it must be an input. Maybe
that can solve your problem.
Regards,
Adriano.
sudhakar_b_v wrote:
>
> Hi Adriano
> Thanks for your reply. Yeah, I've configured the registers so that
> the clock is active high and there's no phase delay. Here's the
code -
>
> #define RESET_USART1() U1CTL |= SWRST
> #define RELEASE_USART1() U1CTL &= ~SWRST
> #define ENABLE_SPI1() ME2 |= USPIE1
> #define DISABLE_SPI1() ME2 &= ~USPIE1
>
> char rxBuf;
>
> void initSPI1()
> {
> WDTCTL = WDTPW+WDTHOLD;
>
> /* Configure port5 */
> P5SEL |= 0x0e;
> P5DIR |= 0x02;
>
> U1CTL = SWRST;
> U1CTL |= CHAR; // CHAR 8-bit Data
> U1CTL |= SYNC; // SYNC SPI Mode.
> U1CTL &= ~MM; // Slave Mode.////
>
> U1TCTL = 0x00;
> U1RCTL = 0x00;
>
> U1MCTL=0x00; // This should be zero always.
>
> rxBuf = U1RXBUF;
>
> U1TXBUF = 0x22;
>
> ENABLE_SPI1();
> RELEASE_USART1();
>
> IE2 |= URXIE1+UTXIE1;
>
> for(i=0xfff;i>0;i--);
> {
> }
>
> _EINT();
> }
>
>
>
> --- In msp430@msp4..., Adriano <adriano@n...> wrote:
>
>>Have you checked clock phase and polarity configurations, Sudhakar?
>
> You
>
>>have to tell MSP in what edge of the clock signal it should sample
>
> data.
>
>>Regards,
>>Adriano.
>>
>>sudhakar_b_v wrote:
>>
>>>--- In msp430@msp4..., "sudhakar_b_v"
>
> <venkata.bulusu@h...>
>
>>>wrote:
>>>
>>>
>>>>I've a dual processor board with NE64 and MSP430F149; they
are
>>>>supposed to communicate using SPI, with MSP430 as the slave. The
>>>>Msp430 uses USART1 as the SPI and I programmed the USART1
>
> registers
>
>>>>for interrupt-enabled SPI communication as an SPI slave (Global
>>>>interrupts are also enabled). However, the MSP430 is never
>>>>interrupted even though the NE64 keeps sending data. I've
kept
>
> the
>
>>>>baud rate quite low and for now I'm interested in seeing
>>>>communication being established more than the correctness of the
>>>>data. Where may I've gone wrong? Thank you.
>>>>
>>>>PS - I've also checked the clock(around 7kHz), data and STE
>
> (active
>
>>>>low during data transfers) signals on an oscilloscope and
didn't
>>>>notice anything out of place.
>>>>
>>>>Regards,
>>>>Sudhakar
>>>
>>>
>>>The MSP430 is now getting regular interrupts; I had made a small
>>>error in the code, my apologies. However, each time it's
>
> interrupted,
>
>>>the data read is 0xFFFF, though the data on the pin seems ok. Any
>>>help is appreciated. Thank you.
>>>
>>>Regards,
>>>Sudhakar
>>>
>>>
>>>
>>>
>>>
>>>.
>>>
>>>
>>>Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>
>
>
>
>
>
> .
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
Reply by ●February 26, 20052005-02-26
Yeah, the port settings were improper, but I corrected them later to
no effect. Thanks, anyway for your help.
Regards,
Sudhakar
--- In msp430@msp4..., Adriano <adriano@n...> wrote:
>
> Your procedure is ok, Sudhakar, but it seems that you have configured
> UCLK1 pin as output. As the MSP is a slave, it must be an input. Maybe
> that can solve your problem.
>
> Regards,
> Adriano.
>
> sudhakar_b_v wrote:
> >
> > Hi Adriano
> > Thanks for your reply. Yeah, I've configured the registers so
that
> > the clock is active high and there's no phase delay. Here's
the code -
> >
> > #define RESET_USART1() U1CTL |= SWRST
> > #define RELEASE_USART1() U1CTL &= ~SWRST
> > #define ENABLE_SPI1() ME2 |= USPIE1
> > #define DISABLE_SPI1() ME2 &= ~USPIE1
> >
> > char rxBuf;
> >
> > void initSPI1()
> > {
> > WDTCTL = WDTPW+WDTHOLD;
> >
> > /* Configure port5 */
> > P5SEL |= 0x0e;
> > P5DIR |= 0x02;
> >
> > U1CTL = SWRST;
> > U1CTL |= CHAR; // CHAR 8-bit Data
> > U1CTL |= SYNC; // SYNC SPI Mode.
> > U1CTL &= ~MM; // Slave Mode.////
> >
> > U1TCTL = 0x00;
> > U1RCTL = 0x00;
> >
> > U1MCTL=0x00; // This should be zero always.
> >
> > rxBuf = U1RXBUF;
> >
> > U1TXBUF = 0x22;
> >
> > ENABLE_SPI1();
> > RELEASE_USART1();
> >
> > IE2 |= URXIE1+UTXIE1;
> >
> > for(i=0xfff;i>0;i--);
> > {
> > }
> >
> > _EINT();
> > }
> >
> >
> >
> > --- In msp430@msp4..., Adriano <adriano@n...> wrote:
> >
> >>Have you checked clock phase and polarity configurations, Sudhakar?
> >
> > You
> >
> >>have to tell MSP in what edge of the clock signal it should sample
> >
> > data.
> >
> >>Regards,
> >>Adriano.
> >>
> >>sudhakar_b_v wrote:
> >>
> >>>--- In msp430@msp4..., "sudhakar_b_v"
> >
> > <venkata.bulusu@h...>
> >
> >>>wrote:
> >>>
> >>>
> >>>>I've a dual processor board with NE64 and MSP430F149;
they are
> >>>>supposed to communicate using SPI, with MSP430 as the
slave. The
> >>>>Msp430 uses USART1 as the SPI and I programmed the USART1
> >
> > registers
> >
> >>>>for interrupt-enabled SPI communication as an SPI slave
(Global
> >>>>interrupts are also enabled). However, the MSP430 is never
> >>>>interrupted even though the NE64 keeps sending data.
I've kept
> >
> > the
> >
> >>>>baud rate quite low and for now I'm interested in
seeing
> >>>>communication being established more than the correctness
of the
> >>>>data. Where may I've gone wrong? Thank you.
> >>>>
> >>>>PS - I've also checked the clock(around 7kHz), data
and STE
> >
> > (active
> >
> >>>>low during data transfers) signals on an oscilloscope and
didn't
> >>>>notice anything out of place.
> >>>>
> >>>>Regards,
> >>>>Sudhakar
> >>>
> >>>
> >>>The MSP430 is now getting regular interrupts; I had made a
small
> >>>error in the code, my apologies. However, each time it's
> >
> > interrupted,
> >
> >>>the data read is 0xFFFF, though the data on the pin seems ok.
Any
> >>>help is appreciated. Thank you.
> >>>
> >>>Regards,
> >>>Sudhakar
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>.
> >>>
> >>>
> >>>Yahoo! Groups Links
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >
> >
> >
> >
> >
> >
> > .
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
