Hi,
I've been trying to setup the UART on my MSP430f149 using the sample
code given. I haven't had much luck. I'm not sure exactly what's
going
on. The code I used is exactly the C example code provided by TI shown
below. However, the interrupt never gets called. (I've send data
directly into the receive pin). I tried to just pass data into the
transmit pin but nothing ever shows up on the pin (I used an
oscilloscope).
Is there some setup that I need to set other than these software parts?
Are there any other pins that need to be used?
This is what I've done:
Powered the Micro
Places a 8Mhz oscillator
Observed the transmit pin for any activity
So far I've not managed to get it to work. What did I miss?
#include
void main(void)
{
volatile unsigned int i;
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P3SEL |= 0x30; // P3.4,5 = USART0 TXD/RXD
BCSCTL1 &= ~XT2OFF; // XT2on
do
{
IFG1 &= ~OFIFG; // Clear OSCFault flag
for (i = 0xFF; i > 0; i--); // Time for flag to set
}
while ((IFG1 & OFIFG)); // OSCFault flag still set?
BCSCTL2 |= SELM_2 + SELS; // MCLK = SMCLK = XT2 (safe)
ME1 |= UTXE0 + URXE0; // Enable USART0 TXD/RXD
UCTL0 |= CHAR; // 8-bit character
UTCTL0 |= SSEL1; // UCLK = SMCLK
UBR00 = 0x45; // 8MHz 115200
UBR10 = 0x00; // 8MHz 115200
UMCTL0 = 0x00; // 8MHz 115200 modulation
UCTL0 &= ~SWRST; // Initialize USART state
machine
IE1 |= URXIE0; // Enable USART0 RX interrupt
_BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
while (1)
{
TXBUF0 |=0xF0;
}
}
#pragma vector=UART0RX_VECTOR
__interrupt void usart0_rx (void)
{
while (!(IFG1 & UTXIFG0)); // USART0 TX buffer ready?
TXBUF0 = RXBUF0; // RXBUF0 to TXBUF0
}
UART Response Problem
Started by ●March 6, 2007
Reply by ●March 7, 20072007-03-07
> P3SEL |= 0x30; // P3.4,5
= USART0 TXD/RXD
You have to set the TXD pin as output with P3DIR, enabling an alt peripheral does not
automatically enable the I/O pins to output (unlike eg. basic AVRs).
That will get your TX to work.
HTH
Best Regards,
Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of matthewolsthoorn
Sent: Wednesday, 7 March 2007 7:55 AM
To: m...
Subject: [msp430] UART Response Problem
Hi,
I've been trying to setup the UART on my MSP430f149 using the sample
code given. I haven't had much luck. I'm not sure exactly what's going
on. The code I used is exactly the C example code provided by TI shown
below. However, the interrupt never gets called. (I've send data
directly into the receive pin). I tried to just pass data into the
transmit pin but nothing ever shows up on the pin (I used an
oscilloscope).
Is there some setup that I need to set other than these software parts?
Are there any other pins that need to be used?
This is what I've done:
Powered the Micro
Places a 8Mhz oscillator
Observed the transmit pin for any activity
So far I've not managed to get it to work. What did I miss?
#include
void main(void)
{
volatile unsigned int i;
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P3SEL |= 0x30; // P3.4,5 = USART0 TXD/RXD
BCSCTL1 &= ~XT2OFF; // XT2on
do
{
IFG1 &= ~OFIFG; // Clear OSCFault flag
for (i = 0xFF; i > 0; i--); // Time for flag to set
}
while ((IFG1 & OFIFG)); // OSCFault flag still set?
BCSCTL2 |= SELM_2 + SELS; // MCLK = SMCLK = XT2 (safe)
ME1 |= UTXE0 + URXE0; // Enable USART0 TXD/RXD
UCTL0 |= CHAR; // 8-bit character
UTCTL0 |= SSEL1; // UCLK = SMCLK
UBR00 = 0x45; // 8MHz 115200
UBR10 = 0x00; // 8MHz 115200
UMCTL0 = 0x00; // 8MHz 115200 modulation
UCTL0 &= ~SWRST; // Initialize USART state
machine
IE1 |= URXIE0; // Enable USART0 RX interrupt
_BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
while (1)
{
TXBUF0 |=0xF0;
}
}
#pragma vector=UART0RX_VECTOR
__interrupt void usart0_rx (void)
{
while (!(IFG1 & UTXIFG0)); // USART0 TX buffer ready?
TXBUF0 = RXBUF0; // RXBUF0 to TXBUF0
}
Yahoo! Groups Links
You have to set the TXD pin as output with P3DIR, enabling an alt peripheral does not
automatically enable the I/O pins to output (unlike eg. basic AVRs).
That will get your TX to work.
HTH
Best Regards,
Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of matthewolsthoorn
Sent: Wednesday, 7 March 2007 7:55 AM
To: m...
Subject: [msp430] UART Response Problem
Hi,
I've been trying to setup the UART on my MSP430f149 using the sample
code given. I haven't had much luck. I'm not sure exactly what's going
on. The code I used is exactly the C example code provided by TI shown
below. However, the interrupt never gets called. (I've send data
directly into the receive pin). I tried to just pass data into the
transmit pin but nothing ever shows up on the pin (I used an
oscilloscope).
Is there some setup that I need to set other than these software parts?
Are there any other pins that need to be used?
This is what I've done:
Powered the Micro
Places a 8Mhz oscillator
Observed the transmit pin for any activity
So far I've not managed to get it to work. What did I miss?
#include
void main(void)
{
volatile unsigned int i;
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P3SEL |= 0x30; // P3.4,5 = USART0 TXD/RXD
BCSCTL1 &= ~XT2OFF; // XT2on
do
{
IFG1 &= ~OFIFG; // Clear OSCFault flag
for (i = 0xFF; i > 0; i--); // Time for flag to set
}
while ((IFG1 & OFIFG)); // OSCFault flag still set?
BCSCTL2 |= SELM_2 + SELS; // MCLK = SMCLK = XT2 (safe)
ME1 |= UTXE0 + URXE0; // Enable USART0 TXD/RXD
UCTL0 |= CHAR; // 8-bit character
UTCTL0 |= SSEL1; // UCLK = SMCLK
UBR00 = 0x45; // 8MHz 115200
UBR10 = 0x00; // 8MHz 115200
UMCTL0 = 0x00; // 8MHz 115200 modulation
UCTL0 &= ~SWRST; // Initialize USART state
machine
IE1 |= URXIE0; // Enable USART0 RX interrupt
_BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
while (1)
{
TXBUF0 |=0xF0;
}
}
#pragma vector=UART0RX_VECTOR
__interrupt void usart0_rx (void)
{
while (!(IFG1 & UTXIFG0)); // USART0 TX buffer ready?
TXBUF0 = RXBUF0; // RXBUF0 to TXBUF0
}
Yahoo! Groups Links
Reply by ●March 7, 20072007-03-07
Hmmmm
I thought that for the UART pins selecting them as special specifically
DID set the IO direction.... in the 169/1611 anyway.
see pin logic diagram on page 53 of msp430f1611.pdf
David
I thought that for the UART pins selecting them as special specifically
DID set the IO direction.... in the 169/1611 anyway.
see pin logic diagram on page 53 of msp430f1611.pdf
David
Reply by ●March 7, 20072007-03-07
Yeah, I'm using the 149, and you don't have to explicitly set the
DIR
register for the UART to work. I think the problem is the code below,
try commenting that out and I think the echo should work.
-Peter
while (1)
{
TXBUF0 |=0xF0;
}
--- In m..., "David Collier"
wrote:
>
> Hmmmm
>
> I thought that for the UART pins selecting them as special specifically
> DID set the IO direction.... in the 169/1611 anyway.
>
> see pin logic diagram on page 53 of msp430f1611.pdf
>
> David
>
register for the UART to work. I think the problem is the code below,
try commenting that out and I think the echo should work.
-Peter
while (1)
{
TXBUF0 |=0xF0;
}
--- In m..., "David Collier"
wrote:
>
> Hmmmm
>
> I thought that for the UART pins selecting them as special specifically
> DID set the IO direction.... in the 169/1611 anyway.
>
> see pin logic diagram on page 53 of msp430f1611.pdf
>
> David
>
Reply by ●March 7, 20072007-03-07
Actually, your right. This couple of lines I added to try and get the
TX pin to send anything. This of course didn't work. My problem came
about before I added this line.
--- In m..., "thapeez" wrote:
>
> Yeah, I'm using the 149, and you don't have to explicitly set the DIR
> register for the UART to work. I think the problem is the code below,
> try commenting that out and I think the echo should work.
>
> -Peter
>
> while (1)
> {
> TXBUF0 |=0xF0;
> }
> --- In m..., "David Collier"
> wrote:
> >
> > Hmmmm
> >
> > I thought that for the UART pins selecting them as special
specifically
> > DID set the IO direction.... in the 169/1611 anyway.
> >
> > see pin logic diagram on page 53 of msp430f1611.pdf
> >
> > David
>
TX pin to send anything. This of course didn't work. My problem came
about before I added this line.
--- In m..., "thapeez" wrote:
>
> Yeah, I'm using the 149, and you don't have to explicitly set the DIR
> register for the UART to work. I think the problem is the code below,
> try commenting that out and I think the echo should work.
>
> -Peter
>
> while (1)
> {
> TXBUF0 |=0xF0;
> }
> --- In m..., "David Collier"
> wrote:
> >
> > Hmmmm
> >
> > I thought that for the UART pins selecting them as special
specifically
> > DID set the IO direction.... in the 169/1611 anyway.
> >
> > see pin logic diagram on page 53 of msp430f1611.pdf
> >
> > David
>
Reply by ●March 7, 20072007-03-07
> Yeah, I'm using the 149, and you don't have
to explicitly set the DIR
> register for the UART to work.
That's news to me - I don't think so !
I distinctly recall having to set TXDs to output on F149.
(The only thing I can think of is that a later die spin changed this...)
The OP posted that sending data out of the TXD pin DID NOT work.
WTF does echo have to do with that ?
Once the TXD pin is functional, then of course writing to the TXBUFx register without waiting
for a free buffer won't help, but that's secondary.
Again, the OP stated that his TX data does not work AT ALL.
Best Regards,
Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of thapeez
Sent: Thursday, 8 March 2007 1:51 AM
To: m...
Subject: [msp430] Re: UART Response Problem
Yeah, I'm using the 149, and you don't have to explicitly set the DIR
register for the UART to work. I think the problem is the code below,
try commenting that out and I think the echo should work.
-Peter
while (1)
{
TXBUF0 |=0xF0;
}
--- In m..., "David Collier"
wrote:
>
> Hmmmm
>
> I thought that for the UART pins selecting them as special specifically
> DID set the IO direction.... in the 169/1611 anyway.
>
> see pin logic diagram on page 53 of msp430f1611.pdf
>
> David
>
Yahoo! Groups Links
> register for the UART to work.
That's news to me - I don't think so !
I distinctly recall having to set TXDs to output on F149.
(The only thing I can think of is that a later die spin changed this...)
The OP posted that sending data out of the TXD pin DID NOT work.
WTF does echo have to do with that ?
Once the TXD pin is functional, then of course writing to the TXBUFx register without waiting
for a free buffer won't help, but that's secondary.
Again, the OP stated that his TX data does not work AT ALL.
Best Regards,
Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of thapeez
Sent: Thursday, 8 March 2007 1:51 AM
To: m...
Subject: [msp430] Re: UART Response Problem
Yeah, I'm using the 149, and you don't have to explicitly set the DIR
register for the UART to work. I think the problem is the code below,
try commenting that out and I think the echo should work.
-Peter
while (1)
{
TXBUF0 |=0xF0;
}
--- In m..., "David Collier"
wrote:
>
> Hmmmm
>
> I thought that for the UART pins selecting them as special specifically
> DID set the IO direction.... in the 169/1611 anyway.
>
> see pin logic diagram on page 53 of msp430f1611.pdf
>
> David
>
Yahoo! Groups Links
Reply by ●March 7, 20072007-03-07
> This couple of lines I added to try and get the TX
pin to send anything.
> This of course didn't work.
Geez, and thank you too for the help, fuck.
What kind of people are on this forum recently anyway ?
I've been here 7 years and I've never had someone reciprocate my help with
such arrogance.
Again, the last time I used F149 you had to set P3DIR to OUT for TXD pins to work...
-- Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of matthewolsthoorn
Sent: Thursday, 8 March 2007 2:03 AM
To: m...
Subject: [msp430] Re: UART Response Problem
Actually, your right. This couple of lines I added to try and get the
TX pin to send anything. This of course didn't work. My problem came
about before I added this line.
--- In m..., "thapeez" wrote:
>
> Yeah, I'm using the 149, and you don't have to explicitly set the DIR
> register for the UART to work. I think the problem is the code below,
> try commenting that out and I think the echo should work.
>
> -Peter
>
> while (1)
> {
> TXBUF0 |=0xF0;
> }
> --- In m..., "David Collier"
> wrote:
> >
> > Hmmmm
> >
> > I thought that for the UART pins selecting them as special
specifically
> > DID set the IO direction.... in the 169/1611 anyway.
> >
> > see pin logic diagram on page 53 of msp430f1611.pdf
> >
> > David
>
Yahoo! Groups Links
> This of course didn't work.
Geez, and thank you too for the help, fuck.
What kind of people are on this forum recently anyway ?
I've been here 7 years and I've never had someone reciprocate my help with
such arrogance.
Again, the last time I used F149 you had to set P3DIR to OUT for TXD pins to work...
-- Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of matthewolsthoorn
Sent: Thursday, 8 March 2007 2:03 AM
To: m...
Subject: [msp430] Re: UART Response Problem
Actually, your right. This couple of lines I added to try and get the
TX pin to send anything. This of course didn't work. My problem came
about before I added this line.
--- In m..., "thapeez" wrote:
>
> Yeah, I'm using the 149, and you don't have to explicitly set the DIR
> register for the UART to work. I think the problem is the code below,
> try commenting that out and I think the echo should work.
>
> -Peter
>
> while (1)
> {
> TXBUF0 |=0xF0;
> }
> --- In m..., "David Collier"
> wrote:
> >
> > Hmmmm
> >
> > I thought that for the UART pins selecting them as special
specifically
> > DID set the IO direction.... in the 169/1611 anyway.
> >
> > see pin logic diagram on page 53 of msp430f1611.pdf
> >
> > David
>
Yahoo! Groups Links
Reply by ●March 7, 20072007-03-07
My apologies, I guess I skimmed too fast and just assumed he wasn't
receiving good data from the uC. So I was trying to get his echo
program to work.
--- In m..., "Microbit" wrote:
>
> > Yeah, I'm using the 149, and you don't have to explicitly set the DIR
> > register for the UART to work.
>
> That's news to me - I don't think so !
> I distinctly recall having to set TXDs to output on F149.
> (The only thing I can think of is that a later die spin changed this...)
>
> The OP posted that sending data out of the TXD pin DID NOT work.
> WTF does echo have to do with that ?
>
> Once the TXD pin is functional, then of course writing to the TXBUFx
register without waiting
> for a free buffer won't help, but that's secondary.
> Again, the OP stated that his TX data does not work AT ALL.
>
> Best Regards,
> Kris
>
> -----Original Message-----
> From: m... [mailto:m...] On
Behalf Of thapeez
> Sent: Thursday, 8 March 2007 1:51 AM
> To: m...
> Subject: [msp430] Re: UART Response Problem
>
> Yeah, I'm using the 149, and you don't have to explicitly set the DIR
> register for the UART to work. I think the problem is the code below,
> try commenting that out and I think the echo should work.
>
> -Peter
>
> while (1)
> {
> TXBUF0 |=0xF0;
> }
> --- In m..., "David Collier"
> wrote:
> >
> > Hmmmm
> >
> > I thought that for the UART pins selecting them as special
specifically
> > DID set the IO direction.... in the 169/1611 anyway.
> >
> > see pin logic diagram on page 53 of msp430f1611.pdf
> >
> > David
> >
>
> Yahoo! Groups Links
>
receiving good data from the uC. So I was trying to get his echo
program to work.
--- In m..., "Microbit" wrote:
>
> > Yeah, I'm using the 149, and you don't have to explicitly set the DIR
> > register for the UART to work.
>
> That's news to me - I don't think so !
> I distinctly recall having to set TXDs to output on F149.
> (The only thing I can think of is that a later die spin changed this...)
>
> The OP posted that sending data out of the TXD pin DID NOT work.
> WTF does echo have to do with that ?
>
> Once the TXD pin is functional, then of course writing to the TXBUFx
register without waiting
> for a free buffer won't help, but that's secondary.
> Again, the OP stated that his TX data does not work AT ALL.
>
> Best Regards,
> Kris
>
> -----Original Message-----
> From: m... [mailto:m...] On
Behalf Of thapeez
> Sent: Thursday, 8 March 2007 1:51 AM
> To: m...
> Subject: [msp430] Re: UART Response Problem
>
> Yeah, I'm using the 149, and you don't have to explicitly set the DIR
> register for the UART to work. I think the problem is the code below,
> try commenting that out and I think the echo should work.
>
> -Peter
>
> while (1)
> {
> TXBUF0 |=0xF0;
> }
> --- In m..., "David Collier"
> wrote:
> >
> > Hmmmm
> >
> > I thought that for the UART pins selecting them as special
specifically
> > DID set the IO direction.... in the 169/1611 anyway.
> >
> > see pin logic diagram on page 53 of msp430f1611.pdf
> >
> > David
> >
>
> Yahoo! Groups Links
>
Reply by ●March 7, 20072007-03-07
Good luck with your code ....
One day a customer will be using (old stock) F149 instead and it'll be :
"Gosh, the serial just stopped working, we just can't figure out why...".
Two days of frantic debugging later it'll sound like this :
"Oops, I thought that the P3DIR register didn't need setting its bits for the TXD pin(s)..."
And all for the sake of 1 line of ASM or C...
Well, I guess we'll never know now :-)
Best Regards,
Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of David Collier
Sent: Wednesday, 7 March 2007 10:13 PM
To: m...
Subject: RE: [msp430] UART Response Problem
Hmmmm
I thought that for the UART pins selecting them as special specifically
DID set the IO direction.... in the 169/1611 anyway.
see pin logic diagram on page 53 of msp430f1611.pdf
David
Yahoo! Groups Links
One day a customer will be using (old stock) F149 instead and it'll be :
"Gosh, the serial just stopped working, we just can't figure out why...".
Two days of frantic debugging later it'll sound like this :
"Oops, I thought that the P3DIR register didn't need setting its bits for the TXD pin(s)..."
And all for the sake of 1 line of ASM or C...
Well, I guess we'll never know now :-)
Best Regards,
Kris
-----Original Message-----
From: m... [mailto:m...] On Behalf Of David Collier
Sent: Wednesday, 7 March 2007 10:13 PM
To: m...
Subject: RE: [msp430] UART Response Problem
Hmmmm
I thought that for the UART pins selecting them as special specifically
DID set the IO direction.... in the 169/1611 anyway.
see pin logic diagram on page 53 of msp430f1611.pdf
David
Yahoo! Groups Links
Reply by ●March 7, 20072007-03-07
> > This couple of lines I added to try and get the TX
pin to send
anything.
> > This of course didn't work.
> Geez, and thank you too for the help, fuck.
> What kind of people are on this forum recently anyway ?
> I've been here 7 years and I've never had someone reciprocate my
help with
> such arrogance.
>
> Again, the last time I used F149 you had to set P3DIR to OUT for TXD
pins to work...
>
> -- Kris
I didn't mean to be rude. I'm sorry if I was. I was just trying to be
thorough.
anything.
> > This of course didn't work.
> Geez, and thank you too for the help, fuck.
> What kind of people are on this forum recently anyway ?
> I've been here 7 years and I've never had someone reciprocate my
help with
> such arrogance.
>
> Again, the last time I used F149 you had to set P3DIR to OUT for TXD
pins to work...
>
> -- Kris
I didn't mean to be rude. I'm sorry if I was. I was just trying to be
thorough.
