Hi,
I am new to this list. I have done a search and I see several results
but I'm still not able to get this just right.
I have an MSP430F149 and I'm using Imagecraft C compiler.
I am new at using the MSP430, and I've been able to transmit one
character out the UART0 port using example code, etc.
The problem is I don't know how to send more than one character.
No matter what I "put" into TXBUF0, it always sends only one
character, or at least that's what I see on the scope and inside
hyperterminal.
I'm using a MAXIM232 chip to write from the MSP430 to my PC.
Eventually I want to be able to read characters/strings from my PC
into the MSP430, but I can't even get beyond this right now.
Any advice is greatly appreciated.
Regards,
Jeff
Sending a string or multiple characters to UART0 MSP430F149 using ImageCraft
Started by ●October 17, 2006
Reply by ●October 18, 20062006-10-18
You may be trying to send the next character before the first is out.
There's no FIFO in the USART on the IC. A simple way is to do
something like this:
void putch_uart1( char ch )
{
while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
TXBUF1 = ch; // send a byte
}
Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
character, but only a few microseconds for the code to write to the USART.
If that doesn't work, why don't you create a really simple test
problem and put it up on the newsgroup for scrutiny.
Stuart'
--- In m..., "Jeff Scharpf" wrote:
>
> Hi,
> I am new to this list. I have done a search and I see several results
> but I'm still not able to get this just right.
>
> I have an MSP430F149 and I'm using Imagecraft C compiler.
> I am new at using the MSP430, and I've been able to transmit one
> character out the UART0 port using example code, etc.
>
> The problem is I don't know how to send more than one character.
> No matter what I "put" into TXBUF0, it always sends only one
> character, or at least that's what I see on the scope and inside
> hyperterminal.
>
> I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> Eventually I want to be able to read characters/strings from my PC
> into the MSP430, but I can't even get beyond this right now.
>
> Any advice is greatly appreciated.
>
> Regards,
>
> Jeff
>
There's no FIFO in the USART on the IC. A simple way is to do
something like this:
void putch_uart1( char ch )
{
while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
TXBUF1 = ch; // send a byte
}
Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
character, but only a few microseconds for the code to write to the USART.
If that doesn't work, why don't you create a really simple test
problem and put it up on the newsgroup for scrutiny.
Stuart'
--- In m..., "Jeff Scharpf" wrote:
>
> Hi,
> I am new to this list. I have done a search and I see several results
> but I'm still not able to get this just right.
>
> I have an MSP430F149 and I'm using Imagecraft C compiler.
> I am new at using the MSP430, and I've been able to transmit one
> character out the UART0 port using example code, etc.
>
> The problem is I don't know how to send more than one character.
> No matter what I "put" into TXBUF0, it always sends only one
> character, or at least that's what I see on the scope and inside
> hyperterminal.
>
> I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> Eventually I want to be able to read characters/strings from my PC
> into the MSP430, but I can't even get beyond this right now.
>
> Any advice is greatly appreciated.
>
> Regards,
>
> Jeff
>
Reply by ●October 18, 20062006-10-18
Thanks Stuart!
That was my problem.
I understand now that there is no FIFO.. I'm used to Visual Basic :), so
it's taking me a while to get where I need to be. I have some large
decimal numbers that I have to assign to a character array, then send the
characters out one at a time. In any event the transmit is working now.
Now my next problem is trying to receive characters. I can't seem to
figure out how to properly enable the receive IRQ.
I think I'm close, but it appears that the interrupt just keeps occuring,
no matter what. (I don't think it's noise as I can disconnect the cable
and same thing).
But it just tells me there's a "1" in the receive buffer, if I can even
trust that.
Jeff
Jeffrey M. Scharpf
Senior Engineering Technician
Milwaukee Electric Tool Corporation
13135 West Lisbon Road, Brookfield, WI, 53005
262-783-8681
email: j...@milwaukeetool.com
http://www.v28power.com
"Stuart_Rubin"
Sent by: m...
10/18/2006 07:07 AM
Please respond to
m...
To
m...
cc
Subject
[msp430] Re: Sending a string or multiple characters to UART0 MSP430F149
using ImageCraft
You may be trying to send the next character before the first is out.
There's no FIFO in the USART on the IC. A simple way is to do
something like this:
void putch_uart1( char ch )
{
while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
TXBUF1 = ch; // send a byte
}
Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
character, but only a few microseconds for the code to write to the USART.
If that doesn't work, why don't you create a really simple test
problem and put it up on the newsgroup for scrutiny.
Stuart'
--- In m..., "Jeff Scharpf" wrote:
>
> Hi,
> I am new to this list. I have done a search and I see several results
> but I'm still not able to get this just right.
>
> I have an MSP430F149 and I'm using Imagecraft C compiler.
> I am new at using the MSP430, and I've been able to transmit one
> character out the UART0 port using example code, etc.
>
> The problem is I don't know how to send more than one character.
> No matter what I "put" into TXBUF0, it always sends only one
> character, or at least that's what I see on the scope and inside
> hyperterminal.
>
> I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> Eventually I want to be able to read characters/strings from my PC
> into the MSP430, but I can't even get beyond this right now.
>
> Any advice is greatly appreciated.
>
> Regards,
>
> Jeff
>
That was my problem.
I understand now that there is no FIFO.. I'm used to Visual Basic :), so
it's taking me a while to get where I need to be. I have some large
decimal numbers that I have to assign to a character array, then send the
characters out one at a time. In any event the transmit is working now.
Now my next problem is trying to receive characters. I can't seem to
figure out how to properly enable the receive IRQ.
I think I'm close, but it appears that the interrupt just keeps occuring,
no matter what. (I don't think it's noise as I can disconnect the cable
and same thing).
But it just tells me there's a "1" in the receive buffer, if I can even
trust that.
Jeff
Jeffrey M. Scharpf
Senior Engineering Technician
Milwaukee Electric Tool Corporation
13135 West Lisbon Road, Brookfield, WI, 53005
262-783-8681
email: j...@milwaukeetool.com
http://www.v28power.com
"Stuart_Rubin"
Sent by: m...
10/18/2006 07:07 AM
Please respond to
m...
To
m...
cc
Subject
[msp430] Re: Sending a string or multiple characters to UART0 MSP430F149
using ImageCraft
You may be trying to send the next character before the first is out.
There's no FIFO in the USART on the IC. A simple way is to do
something like this:
void putch_uart1( char ch )
{
while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
TXBUF1 = ch; // send a byte
}
Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
character, but only a few microseconds for the code to write to the USART.
If that doesn't work, why don't you create a really simple test
problem and put it up on the newsgroup for scrutiny.
Stuart'
--- In m..., "Jeff Scharpf" wrote:
>
> Hi,
> I am new to this list. I have done a search and I see several results
> but I'm still not able to get this just right.
>
> I have an MSP430F149 and I'm using Imagecraft C compiler.
> I am new at using the MSP430, and I've been able to transmit one
> character out the UART0 port using example code, etc.
>
> The problem is I don't know how to send more than one character.
> No matter what I "put" into TXBUF0, it always sends only one
> character, or at least that's what I see on the scope and inside
> hyperterminal.
>
> I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> Eventually I want to be able to read characters/strings from my PC
> into the MSP430, but I can't even get beyond this right now.
>
> Any advice is greatly appreciated.
>
> Regards,
>
> Jeff
>
Reply by ●October 19, 20062006-10-19
Jeff,
If the character string you're sending out is long, you might want to
use the transmitter interrupt so you're not blocking your application
while sending out characters. Send your first character in your main
program, and subsequent characters in the TX ISR.
Can you recieve characters at all or are you just having trouble with
interrupts? I would setup a dumb program that just "polls" for
characters (i.e. "if (IFG2 & URXIFG){d = RXBUF1;}" ) received.
Reading RXBUFx clears the URXIFG pending flag automagically. When
that works, move to an interrupt scheme.
Good luck.
Stuart
--- In m..., Jeffrey Scharpf
wrote:
>
> Thanks Stuart!
>
> That was my problem.
>
> I understand now that there is no FIFO.. I'm used to Visual Basic
:), so
> it's taking me a while to get where I need to be. I have some large
> decimal numbers that I have to assign to a character array, then
send the
> characters out one at a time. In any event the transmit is working now.
>
> Now my next problem is trying to receive characters. I can't seem to
> figure out how to properly enable the receive IRQ.
>
> I think I'm close, but it appears that the interrupt just keeps
occuring,
> no matter what. (I don't think it's noise as I can disconnect the cable
> and same thing).
>
> But it just tells me there's a "1" in the receive buffer, if I can even
> trust that.
>
> Jeff
>
> Jeffrey M. Scharpf
> Senior Engineering Technician
> Milwaukee Electric Tool Corporation
> 13135 West Lisbon Road, Brookfield, WI, 53005
> 262-783-8681
> email: jeffrey.scharpf@...
> http://www.v28power.com
>
> "Stuart_Rubin"
> Sent by: m...
> 10/18/2006 07:07 AM
> Please respond to
> m...
> To
> m...
> cc
>
> Subject
> [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149
> using ImageCraft
> You may be trying to send the next character before the first is out.
> There's no FIFO in the USART on the IC. A simple way is to do
> something like this:
>
> void putch_uart1( char ch )
> {
> while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
> TXBUF1 = ch; // send a byte
> }
>
> Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
> character, but only a few microseconds for the code to write to the
USART.
>
> If that doesn't work, why don't you create a really simple test
> problem and put it up on the newsgroup for scrutiny.
>
> Stuart'
>
> --- In m..., "Jeff Scharpf" wrote:
> >
> > Hi,
> > I am new to this list. I have done a search and I see several results
> > but I'm still not able to get this just right.
> >
> > I have an MSP430F149 and I'm using Imagecraft C compiler.
> > I am new at using the MSP430, and I've been able to transmit one
> > character out the UART0 port using example code, etc.
> >
> > The problem is I don't know how to send more than one character.
> > No matter what I "put" into TXBUF0, it always sends only one
> > character, or at least that's what I see on the scope and inside
> > hyperterminal.
> >
> > I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> > Eventually I want to be able to read characters/strings from my PC
> > into the MSP430, but I can't even get beyond this right now.
> >
> > Any advice is greatly appreciated.
> >
> > Regards,
> >
> > Jeff
> >
>
>
If the character string you're sending out is long, you might want to
use the transmitter interrupt so you're not blocking your application
while sending out characters. Send your first character in your main
program, and subsequent characters in the TX ISR.
Can you recieve characters at all or are you just having trouble with
interrupts? I would setup a dumb program that just "polls" for
characters (i.e. "if (IFG2 & URXIFG){d = RXBUF1;}" ) received.
Reading RXBUFx clears the URXIFG pending flag automagically. When
that works, move to an interrupt scheme.
Good luck.
Stuart
--- In m..., Jeffrey Scharpf
wrote:
>
> Thanks Stuart!
>
> That was my problem.
>
> I understand now that there is no FIFO.. I'm used to Visual Basic
:), so
> it's taking me a while to get where I need to be. I have some large
> decimal numbers that I have to assign to a character array, then
send the
> characters out one at a time. In any event the transmit is working now.
>
> Now my next problem is trying to receive characters. I can't seem to
> figure out how to properly enable the receive IRQ.
>
> I think I'm close, but it appears that the interrupt just keeps
occuring,
> no matter what. (I don't think it's noise as I can disconnect the cable
> and same thing).
>
> But it just tells me there's a "1" in the receive buffer, if I can even
> trust that.
>
> Jeff
>
> Jeffrey M. Scharpf
> Senior Engineering Technician
> Milwaukee Electric Tool Corporation
> 13135 West Lisbon Road, Brookfield, WI, 53005
> 262-783-8681
> email: jeffrey.scharpf@...
> http://www.v28power.com
>
> "Stuart_Rubin"
> Sent by: m...
> 10/18/2006 07:07 AM
> Please respond to
> m...
> To
> m...
> cc
>
> Subject
> [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149
> using ImageCraft
> You may be trying to send the next character before the first is out.
> There's no FIFO in the USART on the IC. A simple way is to do
> something like this:
>
> void putch_uart1( char ch )
> {
> while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
> TXBUF1 = ch; // send a byte
> }
>
> Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
> character, but only a few microseconds for the code to write to the
USART.
>
> If that doesn't work, why don't you create a really simple test
> problem and put it up on the newsgroup for scrutiny.
>
> Stuart'
>
> --- In m..., "Jeff Scharpf" wrote:
> >
> > Hi,
> > I am new to this list. I have done a search and I see several results
> > but I'm still not able to get this just right.
> >
> > I have an MSP430F149 and I'm using Imagecraft C compiler.
> > I am new at using the MSP430, and I've been able to transmit one
> > character out the UART0 port using example code, etc.
> >
> > The problem is I don't know how to send more than one character.
> > No matter what I "put" into TXBUF0, it always sends only one
> > character, or at least that's what I see on the scope and inside
> > hyperterminal.
> >
> > I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> > Eventually I want to be able to read characters/strings from my PC
> > into the MSP430, but I can't even get beyond this right now.
> >
> > Any advice is greatly appreciated.
> >
> > Regards,
> >
> > Jeff
> >
>
>
Reply by ●October 19, 20062006-10-19
Thanks Stuart.
I have the transmit completed.
Regarding the receive, it appears that the interrupts are occuring (I have
some code that reads the RXBUF when the interrupt occurs).. I'm not sure
about this, but it appears that there is always a '1' in the RXBUF.
It doesn't matter whether or not I have actually sent a character.
I will try what you suggested. Thanks!
Jeffrey M. Scharpf
Senior Engineering Technician
Milwaukee Electric Tool Corporation
13135 West Lisbon Road, Brookfield, WI, 53005
262-783-8681
email: j...@milwaukeetool.com
http://www.v28power.com
"Stuart_Rubin"
Sent by: m...
10/19/2006 07:35 AM
Please respond to
m...
To
m...
cc
Subject
[msp430] Re: Sending a string or multiple characters to UART0 MSP430F149
using ImageCraft
Jeff,
If the character string you're sending out is long, you might want to
use the transmitter interrupt so you're not blocking your application
while sending out characters. Send your first character in your main
program, and subsequent characters in the TX ISR.
Can you recieve characters at all or are you just having trouble with
interrupts? I would setup a dumb program that just "polls" for
characters (i.e. "if (IFG2 & URXIFG){d = RXBUF1;}" ) received.
Reading RXBUFx clears the URXIFG pending flag automagically. When
that works, move to an interrupt scheme.
Good luck.
Stuart
--- In m..., Jeffrey Scharpf
wrote:
>
> Thanks Stuart!
>
> That was my problem.
>
> I understand now that there is no FIFO.. I'm used to Visual Basic
:), so
> it's taking me a while to get where I need to be. I have some large
> decimal numbers that I have to assign to a character array, then
send the
> characters out one at a time. In any event the transmit is working now.
>
> Now my next problem is trying to receive characters. I can't seem to
> figure out how to properly enable the receive IRQ.
>
> I think I'm close, but it appears that the interrupt just keeps
occuring,
> no matter what. (I don't think it's noise as I can disconnect the cable
> and same thing).
>
> But it just tells me there's a "1" in the receive buffer, if I can even
> trust that.
>
> Jeff
>
> Jeffrey M. Scharpf
> Senior Engineering Technician
> Milwaukee Electric Tool Corporation
> 13135 West Lisbon Road, Brookfield, WI, 53005
> 262-783-8681
> email: jeffrey.scharpf@...
> http://www.v28power.com
>
> "Stuart_Rubin"
> Sent by: m...
> 10/18/2006 07:07 AM
> Please respond to
> m...
> To
> m...
> cc
>
> Subject
> [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149
> using ImageCraft
> You may be trying to send the next character before the first is out.
> There's no FIFO in the USART on the IC. A simple way is to do
> something like this:
>
> void putch_uart1( char ch )
> {
> while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
> TXBUF1 = ch; // send a byte
> }
>
> Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
> character, but only a few microseconds for the code to write to the
USART.
>
> If that doesn't work, why don't you create a really simple test
> problem and put it up on the newsgroup for scrutiny.
>
> Stuart'
>
> --- In m..., "Jeff Scharpf" wrote:
> >
> > Hi,
> > I am new to this list. I have done a search and I see several results
> > but I'm still not able to get this just right.
> >
> > I have an MSP430F149 and I'm using Imagecraft C compiler.
> > I am new at using the MSP430, and I've been able to transmit one
> > character out the UART0 port using example code, etc.
> >
> > The problem is I don't know how to send more than one character.
> > No matter what I "put" into TXBUF0, it always sends only one
> > character, or at least that's what I see on the scope and inside
> > hyperterminal.
> >
> > I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> > Eventually I want to be able to read characters/strings from my PC
> > into the MSP430, but I can't even get beyond this right now.
> >
> > Any advice is greatly appreciated.
> >
> > Regards,
> >
> > Jeff
> >
>
>
I have the transmit completed.
Regarding the receive, it appears that the interrupts are occuring (I have
some code that reads the RXBUF when the interrupt occurs).. I'm not sure
about this, but it appears that there is always a '1' in the RXBUF.
It doesn't matter whether or not I have actually sent a character.
I will try what you suggested. Thanks!
Jeffrey M. Scharpf
Senior Engineering Technician
Milwaukee Electric Tool Corporation
13135 West Lisbon Road, Brookfield, WI, 53005
262-783-8681
email: j...@milwaukeetool.com
http://www.v28power.com
"Stuart_Rubin"
Sent by: m...
10/19/2006 07:35 AM
Please respond to
m...
To
m...
cc
Subject
[msp430] Re: Sending a string or multiple characters to UART0 MSP430F149
using ImageCraft
Jeff,
If the character string you're sending out is long, you might want to
use the transmitter interrupt so you're not blocking your application
while sending out characters. Send your first character in your main
program, and subsequent characters in the TX ISR.
Can you recieve characters at all or are you just having trouble with
interrupts? I would setup a dumb program that just "polls" for
characters (i.e. "if (IFG2 & URXIFG){d = RXBUF1;}" ) received.
Reading RXBUFx clears the URXIFG pending flag automagically. When
that works, move to an interrupt scheme.
Good luck.
Stuart
--- In m..., Jeffrey Scharpf
wrote:
>
> Thanks Stuart!
>
> That was my problem.
>
> I understand now that there is no FIFO.. I'm used to Visual Basic
:), so
> it's taking me a while to get where I need to be. I have some large
> decimal numbers that I have to assign to a character array, then
send the
> characters out one at a time. In any event the transmit is working now.
>
> Now my next problem is trying to receive characters. I can't seem to
> figure out how to properly enable the receive IRQ.
>
> I think I'm close, but it appears that the interrupt just keeps
occuring,
> no matter what. (I don't think it's noise as I can disconnect the cable
> and same thing).
>
> But it just tells me there's a "1" in the receive buffer, if I can even
> trust that.
>
> Jeff
>
> Jeffrey M. Scharpf
> Senior Engineering Technician
> Milwaukee Electric Tool Corporation
> 13135 West Lisbon Road, Brookfield, WI, 53005
> 262-783-8681
> email: jeffrey.scharpf@...
> http://www.v28power.com
>
> "Stuart_Rubin"
> Sent by: m...
> 10/18/2006 07:07 AM
> Please respond to
> m...
> To
> m...
> cc
>
> Subject
> [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149
> using ImageCraft
> You may be trying to send the next character before the first is out.
> There's no FIFO in the USART on the IC. A simple way is to do
> something like this:
>
> void putch_uart1( char ch )
> {
> while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
> TXBUF1 = ch; // send a byte
> }
>
> Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
> character, but only a few microseconds for the code to write to the
USART.
>
> If that doesn't work, why don't you create a really simple test
> problem and put it up on the newsgroup for scrutiny.
>
> Stuart'
>
> --- In m..., "Jeff Scharpf" wrote:
> >
> > Hi,
> > I am new to this list. I have done a search and I see several results
> > but I'm still not able to get this just right.
> >
> > I have an MSP430F149 and I'm using Imagecraft C compiler.
> > I am new at using the MSP430, and I've been able to transmit one
> > character out the UART0 port using example code, etc.
> >
> > The problem is I don't know how to send more than one character.
> > No matter what I "put" into TXBUF0, it always sends only one
> > character, or at least that's what I see on the scope and inside
> > hyperterminal.
> >
> > I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> > Eventually I want to be able to read characters/strings from my PC
> > into the MSP430, but I can't even get beyond this right now.
> >
> > Any advice is greatly appreciated.
> >
> > Regards,
> >
> > Jeff
> >
>
>
Reply by ●October 19, 20062006-10-19
Stuart,
It looks like I'm just not receiving characters at all.
I monitor the line with a scope and I see it so I know it's ok
electrically.
I'm not sure if I have the UART set up correctly.
Do you have any example code to set up UART0?
I'm using 9600 baud.
Regards,
Jeff
Jeffrey M. Scharpf
Senior Engineering Technician
Milwaukee Electric Tool Corporation
13135 West Lisbon Road, Brookfield, WI, 53005
262-783-8681
email: j...@milwaukeetool.com
http://www.v28power.com
"Stuart_Rubin"
Sent by: m...
10/19/2006 07:35 AM
Please respond to
m...
To
m...
cc
Subject
[msp430] Re: Sending a string or multiple characters to UART0 MSP430F149
using ImageCraft
Jeff,
If the character string you're sending out is long, you might want to
use the transmitter interrupt so you're not blocking your application
while sending out characters. Send your first character in your main
program, and subsequent characters in the TX ISR.
Can you recieve characters at all or are you just having trouble with
interrupts? I would setup a dumb program that just "polls" for
characters (i.e. "if (IFG2 & URXIFG){d = RXBUF1;}" ) received.
Reading RXBUFx clears the URXIFG pending flag automagically. When
that works, move to an interrupt scheme.
Good luck.
Stuart
--- In m..., Jeffrey Scharpf
wrote:
>
> Thanks Stuart!
>
> That was my problem.
>
> I understand now that there is no FIFO.. I'm used to Visual Basic
:), so
> it's taking me a while to get where I need to be. I have some large
> decimal numbers that I have to assign to a character array, then
send the
> characters out one at a time. In any event the transmit is working now.
>
> Now my next problem is trying to receive characters. I can't seem to
> figure out how to properly enable the receive IRQ.
>
> I think I'm close, but it appears that the interrupt just keeps
occuring,
> no matter what. (I don't think it's noise as I can disconnect the cable
> and same thing).
>
> But it just tells me there's a "1" in the receive buffer, if I can even
> trust that.
>
> Jeff
>
> Jeffrey M. Scharpf
> Senior Engineering Technician
> Milwaukee Electric Tool Corporation
> 13135 West Lisbon Road, Brookfield, WI, 53005
> 262-783-8681
> email: jeffrey.scharpf@...
> http://www.v28power.com
>
> "Stuart_Rubin"
> Sent by: m...
> 10/18/2006 07:07 AM
> Please respond to
> m...
> To
> m...
> cc
>
> Subject
> [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149
> using ImageCraft
> You may be trying to send the next character before the first is out.
> There's no FIFO in the USART on the IC. A simple way is to do
> something like this:
>
> void putch_uart1( char ch )
> {
> while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
> TXBUF1 = ch; // send a byte
> }
>
> Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
> character, but only a few microseconds for the code to write to the
USART.
>
> If that doesn't work, why don't you create a really simple test
> problem and put it up on the newsgroup for scrutiny.
>
> Stuart'
>
> --- In m..., "Jeff Scharpf" wrote:
> >
> > Hi,
> > I am new to this list. I have done a search and I see several results
> > but I'm still not able to get this just right.
> >
> > I have an MSP430F149 and I'm using Imagecraft C compiler.
> > I am new at using the MSP430, and I've been able to transmit one
> > character out the UART0 port using example code, etc.
> >
> > The problem is I don't know how to send more than one character.
> > No matter what I "put" into TXBUF0, it always sends only one
> > character, or at least that's what I see on the scope and inside
> > hyperterminal.
> >
> > I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> > Eventually I want to be able to read characters/strings from my PC
> > into the MSP430, but I can't even get beyond this right now.
> >
> > Any advice is greatly appreciated.
> >
> > Regards,
> >
> > Jeff
> >
>
>
It looks like I'm just not receiving characters at all.
I monitor the line with a scope and I see it so I know it's ok
electrically.
I'm not sure if I have the UART set up correctly.
Do you have any example code to set up UART0?
I'm using 9600 baud.
Regards,
Jeff
Jeffrey M. Scharpf
Senior Engineering Technician
Milwaukee Electric Tool Corporation
13135 West Lisbon Road, Brookfield, WI, 53005
262-783-8681
email: j...@milwaukeetool.com
http://www.v28power.com
"Stuart_Rubin"
Sent by: m...
10/19/2006 07:35 AM
Please respond to
m...
To
m...
cc
Subject
[msp430] Re: Sending a string or multiple characters to UART0 MSP430F149
using ImageCraft
Jeff,
If the character string you're sending out is long, you might want to
use the transmitter interrupt so you're not blocking your application
while sending out characters. Send your first character in your main
program, and subsequent characters in the TX ISR.
Can you recieve characters at all or are you just having trouble with
interrupts? I would setup a dumb program that just "polls" for
characters (i.e. "if (IFG2 & URXIFG){d = RXBUF1;}" ) received.
Reading RXBUFx clears the URXIFG pending flag automagically. When
that works, move to an interrupt scheme.
Good luck.
Stuart
--- In m..., Jeffrey Scharpf
wrote:
>
> Thanks Stuart!
>
> That was my problem.
>
> I understand now that there is no FIFO.. I'm used to Visual Basic
:), so
> it's taking me a while to get where I need to be. I have some large
> decimal numbers that I have to assign to a character array, then
send the
> characters out one at a time. In any event the transmit is working now.
>
> Now my next problem is trying to receive characters. I can't seem to
> figure out how to properly enable the receive IRQ.
>
> I think I'm close, but it appears that the interrupt just keeps
occuring,
> no matter what. (I don't think it's noise as I can disconnect the cable
> and same thing).
>
> But it just tells me there's a "1" in the receive buffer, if I can even
> trust that.
>
> Jeff
>
> Jeffrey M. Scharpf
> Senior Engineering Technician
> Milwaukee Electric Tool Corporation
> 13135 West Lisbon Road, Brookfield, WI, 53005
> 262-783-8681
> email: jeffrey.scharpf@...
> http://www.v28power.com
>
> "Stuart_Rubin"
> Sent by: m...
> 10/18/2006 07:07 AM
> Please respond to
> m...
> To
> m...
> cc
>
> Subject
> [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149
> using ImageCraft
> You may be trying to send the next character before the first is out.
> There's no FIFO in the USART on the IC. A simple way is to do
> something like this:
>
> void putch_uart1( char ch )
> {
> while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
> TXBUF1 = ch; // send a byte
> }
>
> Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
> character, but only a few microseconds for the code to write to the
USART.
>
> If that doesn't work, why don't you create a really simple test
> problem and put it up on the newsgroup for scrutiny.
>
> Stuart'
>
> --- In m..., "Jeff Scharpf" wrote:
> >
> > Hi,
> > I am new to this list. I have done a search and I see several results
> > but I'm still not able to get this just right.
> >
> > I have an MSP430F149 and I'm using Imagecraft C compiler.
> > I am new at using the MSP430, and I've been able to transmit one
> > character out the UART0 port using example code, etc.
> >
> > The problem is I don't know how to send more than one character.
> > No matter what I "put" into TXBUF0, it always sends only one
> > character, or at least that's what I see on the scope and inside
> > hyperterminal.
> >
> > I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> > Eventually I want to be able to read characters/strings from my PC
> > into the MSP430, but I can't even get beyond this right now.
> >
> > Any advice is greatly appreciated.
> >
> > Regards,
> >
> > Jeff
> >
>
>
Reply by ●October 19, 20062006-10-19
If I just sit in a loop and read the RXBUF0 I get some goofy character.
Do I have to set up the port direction, etc (P3DIR, etc) for the receive
buffer?
Is this different than the transmit stuff?
Jeff
Jeffrey M. Scharpf
Senior Engineering Technician
Milwaukee Electric Tool Corporation
13135 West Lisbon Road, Brookfield, WI, 53005
262-783-8681
email: j...@milwaukeetool.com
http://www.v28power.com
"Stuart_Rubin"
Sent by: m...
10/19/2006 07:35 AM
Please respond to
m...
To
m...
cc
Subject
[msp430] Re: Sending a string or multiple characters to UART0 MSP430F149
using ImageCraft
Jeff,
If the character string you're sending out is long, you might want to
use the transmitter interrupt so you're not blocking your application
while sending out characters. Send your first character in your main
program, and subsequent characters in the TX ISR.
Can you recieve characters at all or are you just having trouble with
interrupts? I would setup a dumb program that just "polls" for
characters (i.e. "if (IFG2 & URXIFG){d = RXBUF1;}" ) received.
Reading RXBUFx clears the URXIFG pending flag automagically. When
that works, move to an interrupt scheme.
Good luck.
Stuart
--- In m..., Jeffrey Scharpf
wrote:
>
> Thanks Stuart!
>
> That was my problem.
>
> I understand now that there is no FIFO.. I'm used to Visual Basic
:), so
> it's taking me a while to get where I need to be. I have some large
> decimal numbers that I have to assign to a character array, then
send the
> characters out one at a time. In any event the transmit is working now.
>
> Now my next problem is trying to receive characters. I can't seem to
> figure out how to properly enable the receive IRQ.
>
> I think I'm close, but it appears that the interrupt just keeps
occuring,
> no matter what. (I don't think it's noise as I can disconnect the cable
> and same thing).
>
> But it just tells me there's a "1" in the receive buffer, if I can even
> trust that.
>
> Jeff
>
> Jeffrey M. Scharpf
> Senior Engineering Technician
> Milwaukee Electric Tool Corporation
> 13135 West Lisbon Road, Brookfield, WI, 53005
> 262-783-8681
> email: jeffrey.scharpf@...
> http://www.v28power.com
>
> "Stuart_Rubin"
> Sent by: m...
> 10/18/2006 07:07 AM
> Please respond to
> m...
> To
> m...
> cc
>
> Subject
> [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149
> using ImageCraft
> You may be trying to send the next character before the first is out.
> There's no FIFO in the USART on the IC. A simple way is to do
> something like this:
>
> void putch_uart1( char ch )
> {
> while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
> TXBUF1 = ch; // send a byte
> }
>
> Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
> character, but only a few microseconds for the code to write to the
USART.
>
> If that doesn't work, why don't you create a really simple test
> problem and put it up on the newsgroup for scrutiny.
>
> Stuart'
>
> --- In m..., "Jeff Scharpf" wrote:
> >
> > Hi,
> > I am new to this list. I have done a search and I see several results
> > but I'm still not able to get this just right.
> >
> > I have an MSP430F149 and I'm using Imagecraft C compiler.
> > I am new at using the MSP430, and I've been able to transmit one
> > character out the UART0 port using example code, etc.
> >
> > The problem is I don't know how to send more than one character.
> > No matter what I "put" into TXBUF0, it always sends only one
> > character, or at least that's what I see on the scope and inside
> > hyperterminal.
> >
> > I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> > Eventually I want to be able to read characters/strings from my PC
> > into the MSP430, but I can't even get beyond this right now.
> >
> > Any advice is greatly appreciated.
> >
> > Regards,
> >
> > Jeff
> >
>
>
Do I have to set up the port direction, etc (P3DIR, etc) for the receive
buffer?
Is this different than the transmit stuff?
Jeff
Jeffrey M. Scharpf
Senior Engineering Technician
Milwaukee Electric Tool Corporation
13135 West Lisbon Road, Brookfield, WI, 53005
262-783-8681
email: j...@milwaukeetool.com
http://www.v28power.com
"Stuart_Rubin"
Sent by: m...
10/19/2006 07:35 AM
Please respond to
m...
To
m...
cc
Subject
[msp430] Re: Sending a string or multiple characters to UART0 MSP430F149
using ImageCraft
Jeff,
If the character string you're sending out is long, you might want to
use the transmitter interrupt so you're not blocking your application
while sending out characters. Send your first character in your main
program, and subsequent characters in the TX ISR.
Can you recieve characters at all or are you just having trouble with
interrupts? I would setup a dumb program that just "polls" for
characters (i.e. "if (IFG2 & URXIFG){d = RXBUF1;}" ) received.
Reading RXBUFx clears the URXIFG pending flag automagically. When
that works, move to an interrupt scheme.
Good luck.
Stuart
--- In m..., Jeffrey Scharpf
wrote:
>
> Thanks Stuart!
>
> That was my problem.
>
> I understand now that there is no FIFO.. I'm used to Visual Basic
:), so
> it's taking me a while to get where I need to be. I have some large
> decimal numbers that I have to assign to a character array, then
send the
> characters out one at a time. In any event the transmit is working now.
>
> Now my next problem is trying to receive characters. I can't seem to
> figure out how to properly enable the receive IRQ.
>
> I think I'm close, but it appears that the interrupt just keeps
occuring,
> no matter what. (I don't think it's noise as I can disconnect the cable
> and same thing).
>
> But it just tells me there's a "1" in the receive buffer, if I can even
> trust that.
>
> Jeff
>
> Jeffrey M. Scharpf
> Senior Engineering Technician
> Milwaukee Electric Tool Corporation
> 13135 West Lisbon Road, Brookfield, WI, 53005
> 262-783-8681
> email: jeffrey.scharpf@...
> http://www.v28power.com
>
> "Stuart_Rubin"
> Sent by: m...
> 10/18/2006 07:07 AM
> Please respond to
> m...
> To
> m...
> cc
>
> Subject
> [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149
> using ImageCraft
> You may be trying to send the next character before the first is out.
> There's no FIFO in the USART on the IC. A simple way is to do
> something like this:
>
> void putch_uart1( char ch )
> {
> while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
> TXBUF1 = ch; // send a byte
> }
>
> Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
> character, but only a few microseconds for the code to write to the
USART.
>
> If that doesn't work, why don't you create a really simple test
> problem and put it up on the newsgroup for scrutiny.
>
> Stuart'
>
> --- In m..., "Jeff Scharpf" wrote:
> >
> > Hi,
> > I am new to this list. I have done a search and I see several results
> > but I'm still not able to get this just right.
> >
> > I have an MSP430F149 and I'm using Imagecraft C compiler.
> > I am new at using the MSP430, and I've been able to transmit one
> > character out the UART0 port using example code, etc.
> >
> > The problem is I don't know how to send more than one character.
> > No matter what I "put" into TXBUF0, it always sends only one
> > character, or at least that's what I see on the scope and inside
> > hyperterminal.
> >
> > I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> > Eventually I want to be able to read characters/strings from my PC
> > into the MSP430, but I can't even get beyond this right now.
> >
> > Any advice is greatly appreciated.
> >
> > Regards,
> >
> > Jeff
> >
>
>
Reply by ●October 19, 20062006-10-19
Jeff,
here is what I'm doing in my current dev. (F169, Code Composer)
1/ I set the pin function to UART mode : P3SEL |= BIT4 + BIT5;
2/ Then I setup the UART registers.
ME1 |= UTXE0 + URXE0; // Enable USART0 TXD/RXD
UCTL0 |= CHAR + SWRST; // 8-bit character
UTCTL0 = SSEL1; // UCLK= SMCLK
U0RCTL = URXEIE; // Allow error interrupts
UBR00 = 0xAA; // 4.096MHz 9600
UBR10 = 0x01; // 4.096MHz 9600
UMCTL0 = 0x5B; // 4.096MHz 9600 modulation
UCTL0 &= ~SWRST; // Initialize USART state machine
IE1 |= URXIE0 + UTXIE0; // Enable USART0 TX & RX interrupt
3/ I provide two interrupt handlers
USART0TX_ISR( _BTTransmitISR )
__interrupt void _BTTransmitISR( void ){
TXBUF0 = whatever you want...
}
USART0RX_ISR( _BTReceiveISR )
__interrupt void _BTReceiveISR( void ){
// check break condition.
if ( U0RCTL & BRK ){ do your break stuff }
yourvariable = RXBUF0;
}
Hope this helps.
Pascal
_____
De : m... [mailto:m...] De la part de
Jeffrey Scharpf
Envoy: jeudi 19 octobre 2006 18:04
: m...
Objet : Re: [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149 using ImageCraft
Stuart,
It looks like I'm just not receiving characters at all.
I monitor the line with a scope and I see it so I know it's ok
electrically.
I'm not sure if I have the UART set up correctly.
Do you have any example code to set up UART0?
I'm using 9600 baud.
Regards,
Jeff
Jeffrey M. Scharpf
Senior Engineering Technician
Milwaukee Electric Tool Corporation
13135 West Lisbon Road, Brookfield, WI, 53005
262-783-8681
email: jeffrey.scharpf@
milwaukeetool.com
http://www.v28power .com
"Stuart_Rubin" yahoo.com>
Sent by: msp430@yahoogroups. com
10/19/2006 07:35 AM
Please respond to
msp430@yahoogroups. com
To
msp430@yahoogroups. com
cc
Subject
[msp430] Re: Sending a string or multiple characters to UART0 MSP430F149
using ImageCraft
Jeff,
If the character string you're sending out is long, you might want to
use the transmitter interrupt so you're not blocking your application
while sending out characters. Send your first character in your main
program, and subsequent characters in the TX ISR.
Can you recieve characters at all or are you just having trouble with
interrupts? I would setup a dumb program that just "polls" for
characters (i.e. "if (IFG2 & URXIFG){d = RXBUF1;}" ) received.
Reading RXBUFx clears the URXIFG pending flag automagically. When
that works, move to an interrupt scheme.
Good luck.
Stuart
--- In msp430@yahoogroups. com, Jeffrey
Scharpf
wrote:
>
> Thanks Stuart!
>
> That was my problem.
>
> I understand now that there is no FIFO.. I'm used to Visual Basic
:), so
> it's taking me a while to get where I need to be. I have some large
> decimal numbers that I have to assign to a character array, then
send the
> characters out one at a time. In any event the transmit is working now.
>
> Now my next problem is trying to receive characters. I can't seem to
> figure out how to properly enable the receive IRQ.
>
> I think I'm close, but it appears that the interrupt just keeps
occuring,
> no matter what. (I don't think it's noise as I can disconnect the cable
> and same thing).
>
> But it just tells me there's a "1" in the receive buffer, if I can even
> trust that.
>
> Jeff
>
>
>
> Jeffrey M. Scharpf
> Senior Engineering Technician
> Milwaukee Electric Tool Corporation
> 13135 West Lisbon Road, Brookfield, WI, 53005
> 262-783-8681
> email: jeffrey.scharpf@...
> http://www.v28power .com
>
>
>
> "Stuart_Rubin"
> Sent by: msp430@yahoogroups. com
> 10/18/2006 07:07 AM
> Please respond to
> msp430@yahoogroups. com
>
>
> To
> msp430@yahoogroups. com
> cc
>
> Subject
> [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149
> using ImageCraft
>
>
>
>
>
>
> You may be trying to send the next character before the first is out.
> There's no FIFO in the USART on the IC. A simple way is to do
> something like this:
>
> void putch_uart1( char ch )
> {
> while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
> TXBUF1 = ch; // send a byte
> }
>
> Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
> character, but only a few microseconds for the code to write to the
USART.
>
> If that doesn't work, why don't you create a really simple test
> problem and put it up on the newsgroup for scrutiny.
>
> Stuart'
>
> --- In msp430@yahoogroups. com, "Jeff
Scharpf" wrote:
> >
> > Hi,
> > I am new to this list. I have done a search and I see several results
> > but I'm still not able to get this just right.
> >
> > I have an MSP430F149 and I'm using Imagecraft C compiler.
> > I am new at using the MSP430, and I've been able to transmit one
> > character out the UART0 port using example code, etc.
> >
> > The problem is I don't know how to send more than one character.
> > No matter what I "put" into TXBUF0, it always sends only one
> > character, or at least that's what I see on the scope and inside
> > hyperterminal.
> >
> > I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> > Eventually I want to be able to read characters/strings from my PC
> > into the MSP430, but I can't even get beyond this right now.
> >
> > Any advice is greatly appreciated.
> >
> > Regards,
> >
> > Jeff
> >
>
>
>
>
>
>
here is what I'm doing in my current dev. (F169, Code Composer)
1/ I set the pin function to UART mode : P3SEL |= BIT4 + BIT5;
2/ Then I setup the UART registers.
ME1 |= UTXE0 + URXE0; // Enable USART0 TXD/RXD
UCTL0 |= CHAR + SWRST; // 8-bit character
UTCTL0 = SSEL1; // UCLK= SMCLK
U0RCTL = URXEIE; // Allow error interrupts
UBR00 = 0xAA; // 4.096MHz 9600
UBR10 = 0x01; // 4.096MHz 9600
UMCTL0 = 0x5B; // 4.096MHz 9600 modulation
UCTL0 &= ~SWRST; // Initialize USART state machine
IE1 |= URXIE0 + UTXIE0; // Enable USART0 TX & RX interrupt
3/ I provide two interrupt handlers
USART0TX_ISR( _BTTransmitISR )
__interrupt void _BTTransmitISR( void ){
TXBUF0 = whatever you want...
}
USART0RX_ISR( _BTReceiveISR )
__interrupt void _BTReceiveISR( void ){
// check break condition.
if ( U0RCTL & BRK ){ do your break stuff }
yourvariable = RXBUF0;
}
Hope this helps.
Pascal
_____
De : m... [mailto:m...] De la part de
Jeffrey Scharpf
Envoy: jeudi 19 octobre 2006 18:04
: m...
Objet : Re: [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149 using ImageCraft
Stuart,
It looks like I'm just not receiving characters at all.
I monitor the line with a scope and I see it so I know it's ok
electrically.
I'm not sure if I have the UART set up correctly.
Do you have any example code to set up UART0?
I'm using 9600 baud.
Regards,
Jeff
Jeffrey M. Scharpf
Senior Engineering Technician
Milwaukee Electric Tool Corporation
13135 West Lisbon Road, Brookfield, WI, 53005
262-783-8681
email: jeffrey.scharpf@
milwaukeetool.com
http://www.v28power .com
"Stuart_Rubin" yahoo.com>
Sent by: msp430@yahoogroups. com
10/19/2006 07:35 AM
Please respond to
msp430@yahoogroups. com
To
msp430@yahoogroups. com
cc
Subject
[msp430] Re: Sending a string or multiple characters to UART0 MSP430F149
using ImageCraft
Jeff,
If the character string you're sending out is long, you might want to
use the transmitter interrupt so you're not blocking your application
while sending out characters. Send your first character in your main
program, and subsequent characters in the TX ISR.
Can you recieve characters at all or are you just having trouble with
interrupts? I would setup a dumb program that just "polls" for
characters (i.e. "if (IFG2 & URXIFG){d = RXBUF1;}" ) received.
Reading RXBUFx clears the URXIFG pending flag automagically. When
that works, move to an interrupt scheme.
Good luck.
Stuart
--- In msp430@yahoogroups. com, Jeffrey
Scharpf
wrote:
>
> Thanks Stuart!
>
> That was my problem.
>
> I understand now that there is no FIFO.. I'm used to Visual Basic
:), so
> it's taking me a while to get where I need to be. I have some large
> decimal numbers that I have to assign to a character array, then
send the
> characters out one at a time. In any event the transmit is working now.
>
> Now my next problem is trying to receive characters. I can't seem to
> figure out how to properly enable the receive IRQ.
>
> I think I'm close, but it appears that the interrupt just keeps
occuring,
> no matter what. (I don't think it's noise as I can disconnect the cable
> and same thing).
>
> But it just tells me there's a "1" in the receive buffer, if I can even
> trust that.
>
> Jeff
>
>
>
> Jeffrey M. Scharpf
> Senior Engineering Technician
> Milwaukee Electric Tool Corporation
> 13135 West Lisbon Road, Brookfield, WI, 53005
> 262-783-8681
> email: jeffrey.scharpf@...
> http://www.v28power .com
>
>
>
> "Stuart_Rubin"
> Sent by: msp430@yahoogroups. com
> 10/18/2006 07:07 AM
> Please respond to
> msp430@yahoogroups. com
>
>
> To
> msp430@yahoogroups. com
> cc
>
> Subject
> [msp430] Re: Sending a string or multiple characters to UART0
MSP430F149
> using ImageCraft
>
>
>
>
>
>
> You may be trying to send the next character before the first is out.
> There's no FIFO in the USART on the IC. A simple way is to do
> something like this:
>
> void putch_uart1( char ch )
> {
> while( ! (IFG2 & UTXIFG1) ); // Wait for USART TX to be ready
> TXBUF1 = ch; // send a byte
> }
>
> Remember, it takes a LOT of time (i.e. 5 mS at 2400 baud) to send one
> character, but only a few microseconds for the code to write to the
USART.
>
> If that doesn't work, why don't you create a really simple test
> problem and put it up on the newsgroup for scrutiny.
>
> Stuart'
>
> --- In msp430@yahoogroups. com, "Jeff
Scharpf" wrote:
> >
> > Hi,
> > I am new to this list. I have done a search and I see several results
> > but I'm still not able to get this just right.
> >
> > I have an MSP430F149 and I'm using Imagecraft C compiler.
> > I am new at using the MSP430, and I've been able to transmit one
> > character out the UART0 port using example code, etc.
> >
> > The problem is I don't know how to send more than one character.
> > No matter what I "put" into TXBUF0, it always sends only one
> > character, or at least that's what I see on the scope and inside
> > hyperterminal.
> >
> > I'm using a MAXIM232 chip to write from the MSP430 to my PC.
> > Eventually I want to be able to read characters/strings from my PC
> > into the MSP430, but I can't even get beyond this right now.
> >
> > Any advice is greatly appreciated.
> >
> > Regards,
> >
> > Jeff
> >
>
>
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>
