Nabble - MSP430 - Discuss

Re: Re: ez430 hardware problem

2008-09-05T10:35:41Z

I'd like to take a peak under the hood, seeing what happens after a
failed upgrade. Would any of the rest of you care to send me a bricked
ez430?

--Travis

On Fri, 2008-09-05 at 05:54 +0000, old_cow_yellow wrote:

> If you have another regular JTAG programmer and you do not mind
> soldering a few wires, I can help you to to reprogram the eZ430.
>
> Alternatively if you pay the postage, you can also mail them to me and
> I will reprogram them and mail them back to you.
>
> --- In msp430@..., "MAIA" <maiatec@...> wrote:
> >
> > I bought two EZ430 and both had the same problem.
> > How can we revert this situation ? Is there any way to update with
> > the original firmware ?
> > What Texas says about it ?
> >
> > --- In msp430@..., Ian Lesnet <ianlesnet@> wrote:
> > >
> > > That just happened to me. IAR said I needed to update the ez430
> > > firmware, did so, and then it never worked again. Tech support
> > said
> > > that it was dead. The exact reply is below:
> > >
> > > Unfortunately, it seems as though your EZ430 is no longer
> > functional.
> > > The EZ430 should not ever have the firmware upgraded as it is
> > special to
> > > that hardware. For future reference if you are prompted for a
> > firmware
> > > upgrade while using the EZ430 always say "no." It seems in this
> > case you
> > > will need to purchase a new device.
> > >
> > > Cheers,
> > >
> > > ian
> > >
> > >
> > > sivan_toledo wrote:
> > > >
> > > > Windows stopped recognizing my ez430 USB dongle, after having
> > used it
> > > > without a problem for a while. Is there a way to debug this
> > (windows
> > > > just lists it as an "unknown device"), or are they known to fail
> > > > frequently? If so, is there anything in particular that causes
> > them to
> > > > fail?
> > > >
> > > >
> > >
> >
>
>
>
>
>

Re: CC2500 FIFO underflow?

2008-09-05T10:27:03Z

You have probably set the packet length at some point to 64. You then
only send 4 bytes to the buffer before actually transmitting. this means
that the expected 64 bytes aren't there, hence an underflow occurs. When
changing the declaration the packet length is shortened hence no underflow.

Al

abufadel wrote:

>Greetings,
>
>Can anyone explain the reason I am getting an fifo underflow when I
>transmit data that is less than the array?
>
> Here is what I have:
>
>uint8 Data[64];
>
> while (TRUE)
> {
> // Send packet
> halRfSendPacket(Data, 4);
> //halRfStrobe(CC2500_SFTX);
> status = halRfReadStatusReg(CC2500_TXBYTES);
> //Wait a bit such that the receiver is not saturated
> halMcuWaitUs(240); //
> }
>
>The loop above goes through once and hangs on the 2nd iteration.
>Status tells me that the FIFO is underflowed.
>
>However if I change send packet line 6 to be
>halRfSendPacket(Data, 64); no underflow happens.
>
>Also, if I change the Data declaration to Data[4] and keep the original:
>halRfSendPacket(Data, 4); no underflow occurs.
>
>Can anyone explain why something like this would happen? Why does it
>seem that the buffer has to be exact size of the packet? Why can't
>the packet be less?
>
>Any insights appreciated.
>
>Thank you,
>
>A
>
>
>------------------------------------
>
>To unsubscribe from the msp430 group, send an email to:
>msp430-unsubscribe@...
>
>Yahoo! Groups Links
>
>
>
>
>
>
>

CC2500 FIFO underflow?

2008-09-05T10:06:42Z

Greetings,

Can anyone explain the reason I am getting an fifo underflow when I
transmit data that is less than the array?

Here is what I have:

uint8 Data[64];

while (TRUE)
{
// Send packet
halRfSendPacket(Data, 4);
//halRfStrobe(CC2500_SFTX);
status = halRfReadStatusReg(CC2500_TXBYTES);
//Wait a bit such that the receiver is not saturated
halMcuWaitUs(240); //
}

The loop above goes through once and hangs on the 2nd iteration.
Status tells me that the FIFO is underflowed.

However if I change send packet line 6 to be
halRfSendPacket(Data, 64); no underflow happens.

Also, if I change the Data declaration to Data[4] and keep the original:
halRfSendPacket(Data, 4); no underflow occurs.

Can anyone explain why something like this would happen? Why does it
seem that the buffer has to be exact size of the packet? Why can't
the packet be less?

Any insights appreciated.

Thank you,

A

Serial to RF bridge with eZ430-RF2500

2008-09-05T04:04:22Z

I'm creating software for the eZ430-RF2500 usb stick. The software
should act as a 'bridge' between the serial port and the RF chip. It
receives packets from the serial port and sends them via the RF chip.
Conversely, it receives packets from the RF chip and sends them via
the serial port.

I did some research and it appears that there are two ways to control
the CC2500 RF chip:
* MRFI (Minimal RF Interface), as used in the Wireless Sensor Monitor example
http://www.ti.com/litv/zip/slac139b

* MSP430 Interface to CC1100/2500 Code Library
http://focus.ti.com/general/docs/techdocsabstract.tsp?abstractName=slaa325

Does it matter which interface I use? (I don't think there is a much
difference between MRFI_Transmit() or RFSendPacket()). Am I correct?

Second question: Is it allowed to call RFSendPacket (or MRFI_Transmit)
in the USCI0RX_ISR interrupt handler? (I need to transmit the packet
via RF once the last byte or the packet is received from the serial
port).

Johan.

Re: ez430 hardware problem

2008-09-04T22:54:27Z

If you have another regular JTAG programmer and you do not mind
soldering a few wires, I can help you to to reprogram the eZ430.

Alternatively if you pay the postage, you can also mail them to me and
I will reprogram them and mail them back to you.

--- In msp430@..., "MAIA" <maiatec@...> wrote:

>
> I bought two EZ430 and both had the same problem.
> How can we revert this situation ? Is there any way to update with
> the original firmware ?
> What Texas says about it ?
>
> --- In msp430@..., Ian Lesnet <ianlesnet@> wrote:
> >
> > That just happened to me. IAR said I needed to update the ez430
> > firmware, did so, and then it never worked again. Tech support
> said
> > that it was dead. The exact reply is below:
> >
> > Unfortunately, it seems as though your EZ430 is no longer
> functional.
> > The EZ430 should not ever have the firmware upgraded as it is
> special to
> > that hardware. For future reference if you are prompted for a
> firmware
> > upgrade while using the EZ430 always say "no." It seems in this
> case you
> > will need to purchase a new device.
> >
> > Cheers,
> >
> > ian
> >
> >
> > sivan_toledo wrote:
> > >
> > > Windows stopped recognizing my ez430 USB dongle, after having
> used it
> > > without a problem for a while. Is there a way to debug this
> (windows
> > > just lists it as an "unknown device"), or are they known to fail
> > > frequently? If so, is there anything in particular that causes
> them to
> > > fail?
> > >
> > >
> >
>

Re: Doubts about FFT

2008-09-04T16:42:14Z

Great!

It is exactly what I wanted! Thank you very much. I think that I am
ready to start my project. You changed my project and for the better.

Thank you.

Kel

--- In msp430@..., Onestone <onestone@...> wrote:
>
> OK, this is an EXTREMELY simplified explanation, but probably what
you
> are looking for. When you perform an FFT you are basically
calculating
> the energy present for a specfic frequency within the composite
signal
> over a fixed time period. FFts are said to have a certain number of
> 'taps', which are sometimes called 'buckets'. a signal sampled at
8000
> samples a second will have a useful rage of 0-4000hz,. analysign this
> signal with a 100 tap signal will split the original signal into 40
hz
> intervals. The results you get back are typically amplitude and
phase....................

Re: ez430 hardware problem

2008-09-04T13:31:43Z

I bought two EZ430 and both had the same problem.
How can we revert this situation ? Is there any way to update with
the original firmware ?
What Texas says about it ?

--- In msp430@..., Ian Lesnet <ianlesnet@...> wrote:
>
> That just happened to me. IAR said I needed to update the ez430
> firmware, did so, and then it never worked again. Tech support
said
> that it was dead. The exact reply is below:
>
> Unfortunately, it seems as though your EZ430 is no longer
functional.
> The EZ430 should not ever have the firmware upgraded as it is
special to
> that hardware. For future reference if you are prompted for a
firmware
> upgrade while using the EZ430 always say "no." It seems in this
case you

> will need to purchase a new device.
>
> Cheers,
>
> ian
>
>
> sivan_toledo wrote:
> >
> > Windows stopped recognizing my ez430 USB dongle, after having

used it
> > without a problem for a while. Is there a way to debug this
(windows
> > just lists it as an "unknown device"), or are they known to fail
> > frequently? If so, is there anything in particular that causes
them to
> > fail?
> >
> >
>

I2C EEPROM interface: SLAA208 question

2008-09-04T12:45:51Z

I need help on I2C interface to an EEPROM via I2C bus to a
small size EEPROM chip using one-byte address mode, as opposed to
the two-byte addressing from which
I downloaded the sample code from SLAA208 on TI website, the sample
code was written for a large EEPROM device which requires
two bytes for addressing.

Here is a section of the code:

void main()
{
InitI2C(); // Initialize I2C module
_EINT();
.
.

EEPROM_ByteWrite(0x0000,0x12); //write to address 0x0000
//two byte addressing !!!
}

///=================================//
void EEPROM_ByteWrite(unsigned int Address, unsigned char Data)
{
unsigned char adr_hi;
unsigned char adr_lo;

while (I2CDCTL&I2CBUSY); // wait until I2C module has finished all operations

adr_hi = Address >> 8; // calculate high byte
adr_lo = Address & 0xFF; // and low byte of address

I2CBuffer[2] = adr_hi; // store single bytes that have to be sent
I2CBuffer[1] = adr_lo; // in the I2CBuffer.
I2CBuffer[0] = Data;
PtrTransmit = 2; // set I2CBuffer Pointer

I2CWriteInit();
I2CNDAT = 3; // 1 control byte + 3 bytes should be transmitted
I2CTCTL |= I2CSTT+I2CSTP; // start and stop condition generation
// => I2C communication is started
}

My question is:

How do I modify the above code so that it only uses one-byte addressing for
much smaller EEPROM device (less that 256 byte).

Thanks in advance,

JS

Re:Re: Doubts about FFT

2008-09-04T10:30:44Z

Try this document:
http://focus.tij.co.jp/jp/lit/an/spra417a/spra417a.pdf
It is an implementation example of a spectrum analyser using 128pt FFT in a TI's DSP. It is an assembly program (:P) but can easily be converted to MSP's code (assembly, of course... You may need to make some routines to perform functions that are natural to DSP's architecture).
Then just summ this paper with all others you have, along with explanations you've got here, and you will be able to implement your project.
In a matter of fact this paper does exactly what you need. Just forget the part where it puts the results in a DAC and stays where it scans the results to find the biggest value...
-Augusto

De:msp430@...

Para:msp430@...

Cópia:

Data:Thu, 04 Sep 2008 14:01:26 -0000

Assunto:[msp430] Re: Doubts about FFT

Sorry friend,
I think that my question was wrong. I know a little about FFT.
Actually I want to know how I can read the results of the FFT
according to the frequency. The results is a sequence of bits,
right? So, how I show the results voltage x frequency? For example,
if I could measure the output with an oscilloscope, as I see this
sign?
In my project I need to discovery two predominat frequency in one
signal, but I don't know what I do after FFT.

Did you understand my questions? Sorry, my english is poor.

Thanks for all,

--- In msp430@..., "p_murayama" <pascal@...> wrote:
>
> Hello.
>
> As a student, you might be interested in reading a little bit
about what
> is an FFT. Google keys: Cooley, Sand, Tuckey (I am not sure of the
spelling
> of this one).
>
> That said, the FFT transform a set of time samples (power of 2),
into
> another set of frequency samples (same power of 2). So if you FFT
your
> input signal, you will get exactly what you want: the amplitude of
each
> of the frequency components. Then you look for the strongest
sample to
> have the predominant frequency.
>
> The result? If you are sampling a voltage (V(t)) you will get the
same
> voltage as a function of the frequency (V(f)). Basically, you get
> you input, under another representation.
>
> Suppose that your sampling frequency is 1000 Hz and that you are
> sampling a sinewave of amplitude 1 at exactly 250 Hz, you will get
> 2 spikes only in the output signal, ona at 250 Hz, and one at 750
Hz.
> Just ignore the second (1) one which is an alias of the first one,
and that's
> about it, the result tells you that you have only 250 Hz, what you
already
> knew in this case.
>
> (1) as I assume your signal is purely real (output of an ADC),
> you can just ignore the upper half of the output set (samples from
N/2
> to N-1). Hint: you don't have to calculate what you will finally
ignore.
>
> Last thing (that should come first): Before sampling, make sure
that the

> max frequency of what you want to measure is less than half of the
> sampling frequency, otherwise you will get unwanted results.
>
> Pascal
>
> --- In msp430@..., "keller.lima" <keller.lima@> wrote:
> >
> > Friends,
> >
> > I read the application note about The MSP430 Hardware

Multiplier:
> >
> > http://www.microcontrol.cn/datasheet/MSP430/MSP430AN/slaa042.pdf
> >
> > I understand many things but I have a question: what is the
FFT
> > results format? The data results are in the format Tension x
Freq?
> >
> > I need to know what are the predominant frequencies of the
signal.
> >
> > Please help a desperate student,
> >
> > Thanks,
> >
>

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

Re: Re: Doubts about FFT

2008-09-04T07:47:05Z

OK, this is an EXTREMELY simplified explanation, but probably what you
are looking for. When you perform an FFT you are basically calculating
the energy present for a specfic frequency within the composite signal
over a fixed time period. FFts are said to have a certain number of
'taps', which are sometimes called 'buckets'. a signal sampled at 8000
samples a second will have a useful rage of 0-4000hz,. analysign this
signal with a 100 tap signal will split the original signal into 40 hz
intervals. The results you get back are typically amplitude and phase.
each pair will allow you to create a sinusoial signal at the centre
frequency of that 'bucket'. Summing these signals will result in the
reconstruction of the original signal. So, very simply looking for the
two highest amplitudes will give you the two dominant signals.

remember this is a crude explanation of what is happening. there is much
more to it, and I suggest that you study this practically, as well as
from reference books. for example:-

1. create a few waveforms from known sinusoidal signals then run an FFt
on them with 'buckets' that match the original freqiencies.
2. Now repeat this with a differnet set of 'buckets'
3. analyse a complex waveform and then reconstruct it. see how accurate
it is. (HINT: beware of the DC component)
4. analyse a complex waveform such as an audio signal, then reconstruct
it using only every 2nd, 3rd or 4th 'bucket', keep getting 'thinner' wit
your data and see what happens.
5. recostruct using a fixed value for phase, and see what happens to
your audio signal.

These are justa few fun things to do with FFT's.

By the way EXcel also can do FFT's. it is interesting to load a table
with a set of data froma composite waveform and then play aroun din Excel.

Al

keller.lima wrote:

>Sorry friend,
>I think that my question was wrong. I know a little about FFT.
>Actually I want to know how I can read the results of the FFT
>according to the frequency. The results is a sequence of bits,
>right? So, how I show the results voltage x frequency? For example,
>if I could measure the output with an oscilloscope, as I see this
>sign?
>In my project I need to discovery two predominat frequency in one
>signal, but I don't know what I do after FFT.
>
>Did you understand my questions? Sorry, my english is poor.
>
>
>Thanks for all,
>
>
>--- In msp430@..., "p_murayama" <pascal@...> wrote:
>
>
>>Hello.
>>
>>As a student, you might be interested in reading a little bit
>>
>>
>about what
>
>
>>is an FFT. Google keys: Cooley, Sand, Tuckey (I am not sure of the
>>
>>
>spelling
>
>
>>of this one).
>>
>>That said, the FFT transform a set of time samples (power of 2),
>>
>>
>into
>
>
>>another set of frequency samples (same power of 2). So if you FFT
>>
>>
>your
>
>
>>input signal, you will get exactly what you want: the amplitude of
>>
>>
>each
>
>
>>of the frequency components. Then you look for the strongest
>>
>>
>sample to
>
>
>>have the predominant frequency.
>>
>>The result? If you are sampling a voltage (V(t)) you will get the
>>
>>
>same
>
>
>>voltage as a function of the frequency (V(f)). Basically, you get
>>you input, under another representation.
>>
>>Suppose that your sampling frequency is 1000 Hz and that you are
>>sampling a sinewave of amplitude 1 at exactly 250 Hz, you will get
>>2 spikes only in the output signal, ona at 250 Hz, and one at 750
>>
>>
>Hz.
>
>
>>Just ignore the second (1) one which is an alias of the first one,
>>
>>
>and that's
>
>
>>about it, the result tells you that you have only 250 Hz, what you
>>
>>
>already
>
>
>>knew in this case.
>>
>>(1) as I assume your signal is purely real (output of an ADC),
>>you can just ignore the upper half of the output set (samples from
>>
>>
>N/2
>
>
>>to N-1). Hint: you don't have to calculate what you will finally
>>
>>
>ignore.
>
>
>>Last thing (that should come first): Before sampling, make sure
>>
>>
>that the
>
>
>>max frequency of what you want to measure is less than half of the
>>sampling frequency, otherwise you will get unwanted results.
>>
>>Pascal
>>
>>--- In msp430@..., "keller.lima" <keller.lima@> wrote:
>>
>>
>>> Friends,
>>>
>>> I read the application note about The MSP430 Hardware
>>>
>>>
>Multiplier:
>
>
>>>http://www.microcontrol.cn/datasheet/MSP430/MSP430AN/slaa042.pdf
>>>
>>> I understand many things but I have a question: what is the
>>>
>>>
>FFT
>
>
>>>results format? The data results are in the format Tension x
>>>
>>>
>Freq?
>
>
>>> I need to know what are the predominant frequencies of the
>>>
>>>
>signal.
>
>
>>>Please help a desperate student,
>>>
>>>Thanks,
>>>
>>>
>>>
>
>
>
>------------------------------------
>
>To unsubscribe from the msp430 group, send an email to:
>msp430-unsubscribe@...
>
>Yahoo! Groups Links
>
>
>
>
>
>
>

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

Re: Re: MSP430F2417 question

2008-09-04T07:42:18Z

old_cow_yellow wrote:
>
>
> I was wondering about this too.
>
> I think you need to write the code in small chunks and use ORG to
> force the linker to skip over the vectors when the next chunk cannot
> fit in the lower 64K address anymore.

Sorry for picking up an old thread...

The linker supports placing segments parts into more than one location.
For example, you can use the following:

-P(CODE)CODE=3100-FFBD,10000-19FFF

In fact, this is taken from the provided linker command files.

-- Anders Lindgren, IAR Systems
--
Disclaimer: Opinions expressed in this posting are strictly my own and
not necessarily those of my employer.

Custom startup routine Re: Static int declaration and initialization

2008-09-04T07:04:37Z

All, I do want to clarify that on the projects which used custom
startup routines were NOT MSP430-based systems. They happen to have
been 68HC12 and ARM9 boards, but I still maintain that the
customizations had questionable utility at best.

Stuart

--- In msp430@..., "Stuart_Rubin" <stuart_rubin@...> wrote:

>
> My experience has been that custom startup code causes more problems
> than it's worth. To the original poster, would you please give us
> some insight as to why you needed to customize it?
>
> My (limited) experience has been that any optimizations are
> overwhelmed by the complications and potential for problems (as shown
> by the poster). If you need RAM or some hardware initialized in some
> special way, why didn't you just do it at the top of main()? On an
> MSP430, there is so little RAM, and I'm sure very little of it get
> pre-initialized.
>
> The only time I've seen a custom startup routine make sense (and I
> actually don't agree that it was the best way to do it) was in an
> avionics application where a restart was implicitly due to a power
> blip and certain hardware had to be initialized quickly.
>
> This is not a criticism, but I really do want to know what drove that
> design decision.
>
> Thanks.
>
> Stuart
>
>
> --- In msp430@..., "Mirko Viviani" <furetto76@> wrote:
> >
> > the problem was in the custom cstartup code.
> > By replacing it with the default one, no more problems occurred.
> >
> > Thanks a lot for the tips!
> >
> > 2008/9/3 Anders Lindgren <Anders.lindgren@>
> >
> > > Hi!
> > >
> > > Just to eliminate the obvious -- did you include the header file
> "stdio.h"?
> > >
> > > If not, then you should have listened to the compiler warnings
> (they are
> > > there for a reason). On the other hand, if you did include it you
> should
> > > have included it in the example you posted here.
> > >
> > > If we assume that that is not the issue, what is the value of the
> > > variable "i" if you debug the application?
> > >
> > > What settings do you use? (Optimization levels, data models etc.)
> > >
> > > -- Anders Lindgren, IAR Systems
> > >
> > >
> > > Mirko Viviani wrote:
> > > > Using IAR on a MSP430F1611 (MSP430 family) this piece of code
> does not
> > > work
> > > > (printf will print something else than 23)
> > > > I cannot split the inizialization from declaration (source code
> cannot be
> > > > modified): any idea?
> > > >
> > > > static int i=23;
> > > > void main()
> > > > {
> > > > printf("%d",i);
> > > > }
> > > >
> > > > Obviously splitting initialization from declaration works.
> > >
> > > --
> > > Disclaimer: Opinions expressed in this posting are strictly my

own and

> > > not necessarily those of my employer.
> > >
> > >
> > >
> >
> >
> >
> > --
> > -- Mirko Viviani --
> > GPG-PGP Public Key: 0xE4E8FAB1
> > Fingerprint: 14D3 A373 E926 7737 DF32 502B A4C4 1CE2 E4E8 FAB1
> > ***********************************************
> > ""Machines take me by surprise with great frequency." A. Turing
> >
> >
> > [Non-text portions of this message have been removed]
> >
>

Re: Doubts about FFT

2008-09-04T07:01:26Z

Sorry friend,
I think that my question was wrong. I know a little about FFT.
Actually I want to know how I can read the results of the FFT
according to the frequency. The results is a sequence of bits,
right? So, how I show the results voltage x frequency? For example,
if I could measure the output with an oscilloscope, as I see this
sign?
In my project I need to discovery two predominat frequency in one
signal, but I don't know what I do after FFT.

Did you understand my questions? Sorry, my english is poor.

Thanks for all,

--- In msp430@..., "p_murayama" <pascal@...> wrote:
>
> Hello.
>
> As a student, you might be interested in reading a little bit
about what
> is an FFT. Google keys: Cooley, Sand, Tuckey (I am not sure of the
spelling
> of this one).
>
> That said, the FFT transform a set of time samples (power of 2),
into
> another set of frequency samples (same power of 2). So if you FFT
your
> input signal, you will get exactly what you want: the amplitude of
each
> of the frequency components. Then you look for the strongest
sample to
> have the predominant frequency.
>
> The result? If you are sampling a voltage (V(t)) you will get the
same
> voltage as a function of the frequency (V(f)). Basically, you get
> you input, under another representation.
>
> Suppose that your sampling frequency is 1000 Hz and that you are
> sampling a sinewave of amplitude 1 at exactly 250 Hz, you will get
> 2 spikes only in the output signal, ona at 250 Hz, and one at 750
Hz.
> Just ignore the second (1) one which is an alias of the first one,
and that's
> about it, the result tells you that you have only 250 Hz, what you
already
> knew in this case.
>
> (1) as I assume your signal is purely real (output of an ADC),
> you can just ignore the upper half of the output set (samples from
N/2
> to N-1). Hint: you don't have to calculate what you will finally
ignore.
>
> Last thing (that should come first): Before sampling, make sure
that the

Custom startup routine Re: Static int declaration and initialization

2008-09-04T05:56:31Z

My experience has been that custom startup code causes more problems
than it's worth. To the original poster, would you please give us
some insight as to why you needed to customize it?

My (limited) experience has been that any optimizations are
overwhelmed by the complications and potential for problems (as shown
by the poster). If you need RAM or some hardware initialized in some
special way, why didn't you just do it at the top of main()? On an
MSP430, there is so little RAM, and I'm sure very little of it get
pre-initialized.

The only time I've seen a custom startup routine make sense (and I
actually don't agree that it was the best way to do it) was in an
avionics application where a restart was implicitly due to a power
blip and certain hardware had to be initialized quickly.

This is not a criticism, but I really do want to know what drove that
design decision.

Thanks.

Stuart

--- In msp430@..., "Mirko Viviani" <furetto76@...> wrote:

>
> the problem was in the custom cstartup code.
> By replacing it with the default one, no more problems occurred.
>
> Thanks a lot for the tips!
>
> 2008/9/3 Anders Lindgren <Anders.lindgren@...>
>
> > Hi!
> >
> > Just to eliminate the obvious -- did you include the header file

"stdio.h"?
> >
> > If not, then you should have listened to the compiler warnings
(they are
> > there for a reason). On the other hand, if you did include it you
should

> > have included it in the example you posted here.
> >
> > If we assume that that is not the issue, what is the value of the
> > variable "i" if you debug the application?
> >
> > What settings do you use? (Optimization levels, data models etc.)
> >
> > -- Anders Lindgren, IAR Systems
> >
> >
> > Mirko Viviani wrote:
> > > Using IAR on a MSP430F1611 (MSP430 family) this piece of code

does not
> > work
> > > (printf will print something else than 23)
> > > I cannot split the inizialization from declaration (source code
cannot be

> > > modified): any idea?
> > >
> > > static int i=23;
> > > void main()
> > > {
> > > printf("%d",i);
> > > }
> > >
> > > Obviously splitting initialization from declaration works.
> >
> > --
> > Disclaimer: Opinions expressed in this posting are strictly my own and
> > not necessarily those of my employer.
> >
> >
> >
>
>
>
> --
> -- Mirko Viviani --
> GPG-PGP Public Key: 0xE4E8FAB1
> Fingerprint: 14D3 A373 E926 7737 DF32 502B A4C4 1CE2 E4E8 FAB1
> ***********************************************
> ""Machines take me by surprise with great frequency." A. Turing
>
>
> [Non-text portions of this message have been removed]
>

Re: help needed with interfacing 3-axis accelerometer with MSP430F2013

2008-09-04T05:51:57Z

Thanks OneStone and Juan,

Currently I am not that concerned with the time gap between the three
axis, also for design purpose we are stuck with 2013 at the moment but
I will take your suggestion into consideration when in my next update.

thanks so much for your help

Chinmay
--- In msp430@..., Onestone <onestone@...> wrote:
>
> For most accelerometer applications the SD16 is not a good choice,
since
> the measurements are not even close to being time aligned. This slew
> means that the motion relationships between axes cannot be relied
upon.
> You are better off using either a digital output sensor, such as the
PWM
> output, or one with a serial output, since in the first case the
micro
> in edge trigger mode will store edges simultaneously, even though
they
> are not accessed precisely together, while in the serial systems
most of
> them convert sycnhronously so that data is time aligned. The
downside to
> most serial systems is that they limit each result to 8 bits. The
next
> best option would be to use a device with a SAR converter, such as
the
> 2012,. Even though these are not sampled synchronously, so there is
> still some time skew, the delay between samples can be much shorter
than
> with the Sd16 module, for the same resolution.
>
> if you're stuck wit the 2013 then follow Juans recommendations.
>
> Al
>
> Chinmay Manohar wrote:
>
> >wondering if anyone has tried using the SD16 on MSP430F2013
configured
> >to do AtoD conversion on multiple (external) input channels. So far
> >I've been able to read a single axis on the accelerometer, reading
all
> >3 axes in sequential pattern has not been possible so far. any help
/

> >guidance is highly appreciated...
> >
> >thanks
> >C
> >
> >
> >------------------------------------
> >
> >To unsubscribe from the msp430 group, send an email to:
> >msp430-unsubscribe@...
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>

Re: Static int declaration and initialization

2008-09-04T04:00:42Z

I though at cstartup code only after the old_cow_yellow response.
Anyway, thanks to everybody!

2008/9/4 Richard (UK) <ymsp430@...>

> >>> the problem was in the custom cstartup code. By replacing it with
> the
> >>> default one, no more problems occurred.
>
> ... but ... but ... but ... you didn't tell us that you had changed the
> startup code!
>
> If you change a very major part of the system such as the startup code and
> then basic C code stops working, then maybe just maybe you might have
> broken
> something!
>
> If you had provided FULL information then maybe you would have had an
> instant & correct reply.
>
>
>

--
-- Mirko Viviani --
GPG-PGP Public Key: 0xE4E8FAB1
Fingerprint: 14D3 A373 E926 7737 DF32 502B A4C4 1CE2 E4E8 FAB1
***********************************************
""Machines take me by surprise with great frequency." A. Turing

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

Re: Static int declaration and initialization

2008-09-04T03:28:12Z

>>> the problem was in the custom cstartup code. By replacing it with the
>>> default one, no more problems occurred.

... but ... but ... but ... you didn't tell us that you had changed the
startup code!

If you change a very major part of the system such as the startup code and
then basic C code stops working, then maybe just maybe you might have broken
something!

If you had provided FULL information then maybe you would have had an
instant & correct reply.

Re: RS232 with MSP-EXP430FG4618 Experimenter Board

2008-09-03T23:37:41Z

--- In msp430@..., Raymond Sun <raymond9804@...> wrote:
>
> Hi,
>
> Would you please provide more information about how to use the
RS232 in MSP-EXP430FG4618 Experimenter Board?
> The slau214a.pdf document on www.ti.com did not give enough.
>
> Can I use example code in slac129a.zip for MSP430FG4618? But how
can I relate its pins to the RS232 in MSP-EXP430FG4618 Experimenter
Board?
> Thanks,
>
> Raymond
>
>
>
>
__________________________________________________________________
> Yahoo! Canada Toolbar: Search from anywhere on the web, and
bookmark your favourite sites. Download it now at
> http://ca.toolbar.yahoo.com.
>
> [Non-text portions of this message have been removed]
>

try the below link(page24 LAB 1)
http://focus.ti.com/lit/ml/slap117/slap117.pdf

ATC board is MSP-EXP430FG4618.

And also you can find sample code for UART comm in
http://focus.ti.com/docs/prod/folders/print/msp430fg4618.html#toolsso
ftware
slac118b.zip(msp430xG46x_uscia0_uart....)

Re: Static int declaration and initialization

2008-09-03T23:35:10Z

the problem was in the custom cstartup code.
By replacing it with the default one, no more problems occurred.

Thanks a lot for the tips!

2008/9/3 Anders Lindgren <Anders.lindgren@...>

> Hi!
>
> Just to eliminate the obvious -- did you include the header file "stdio.h"?
>
> If not, then you should have listened to the compiler warnings (they are
> there for a reason). On the other hand, if you did include it you should
> have included it in the example you posted here.
>
> If we assume that that is not the issue, what is the value of the
> variable "i" if you debug the application?
>
> What settings do you use? (Optimization levels, data models etc.)
>
> -- Anders Lindgren, IAR Systems
>
>
> Mirko Viviani wrote:
> > Using IAR on a MSP430F1611 (MSP430 family) this piece of code does not
> work
> > (printf will print something else than 23)
> > I cannot split the inizialization from declaration (source code cannot be
> > modified): any idea?
> >
> > static int i=23;
> > void main()
> > {
> > printf("%d",i);
> > }
> >
> > Obviously splitting initialization from declaration works.
>
> --
> Disclaimer: Opinions expressed in this posting are strictly my own and
> not necessarily those of my employer.
>
>
>

Re: Doubts about FFT

2008-09-03T21:18:07Z

Hello.

As a student, you might be interested in reading a little bit about what
is an FFT. Google keys: Cooley, Sand, Tuckey (I am not sure of the spelling
of this one).

That said, the FFT transform a set of time samples (power of 2), into
another set of frequency samples (same power of 2). So if you FFT your
input signal, you will get exactly what you want: the amplitude of each
of the frequency components. Then you look for the strongest sample to
have the predominant frequency.

The result? If you are sampling a voltage (V(t)) you will get the same
voltage as a function of the frequency (V(f)). Basically, you get what
you input, under another representation.

Suppose that your sampling frequency is 1000 Hz and that you are
sampling a sinewave of amplitude 1 at exactly 250 Hz, you will get
2 spikes only in the output signal, ona at 250 Hz, and one at 750 Hz.
Just ignore the second (1) one which is an alias of the first one, and that's
about it, the result tells you that you have only 250 Hz, what you already
knew in this case.

(1) as I assume your signal is purely real (output of an ADC),
you can just ignore the upper half of the output set (samples from N/2
to N-1). Hint: you don't have to calculate what you will finally ignore.

Last thing (that should come first): Before sampling, make sure that the
max frequency of what you want to measure is less than half of the
sampling frequency, otherwise you will get unwanted results.

Pascal

--- In msp430@..., "keller.lima" <keller.lima@...> wrote:

>
> Friends,
>
> I read the application note about The MSP430 Hardware Multiplier:
>
> http://www.microcontrol.cn/datasheet/MSP430/MSP430AN/slaa042.pdf
>
> I understand many things but I have a question: what is the FFT
> results format? The data results are in the format Tension x Freq?
>
> I need to know what are the predominant frequencies of the signal.
>
> Please help a desperate student,
>
> Thanks,
>

Re: Doubts about FFT

2008-09-03T21:03:08Z

The input to FFT is a discrete quantized waveform in the time domain.
The output from FFT is a discrete quantized frequency spectrum in the
frequency domain. The predominant frequencies are the frequencies of
the predominant peaks in the frequency spectrum.

--- In msp430@..., "keller.lima" <keller.lima@...> wrote:

Doubts about FFT

2008-09-03T20:18:56Z

Friends,

I read the application note about The MSP430 Hardware Multiplier:

http://www.microcontrol.cn/datasheet/MSP430/MSP430AN/slaa042.pdf

I understand many things but I have a question: what is the FFT
results format? The data results are in the format Tension x Freq?

I need to know what are the predominant frequencies of the signal.

Please help a desperate student,

Thanks,

Re: Can any plz explain this

2008-09-03T20:01:44Z

--- In msp430@..., "Paul Curtis" <plc@...> wrote:
>
> Hi,
>
> > Hiyaa,,,
> > I was going through the example program from TI about use of ADC,
> > In this program, their is one instruction.
> > WDTCTL = WDT_MDLY_32; // WDT Timer interval
> > I have gone through User guide but didnt get how watchdog
interval is set,
> > actually what is this WDT_MDLY_32.
> > Plz help me outttttt....
> > Navvvvv !
>
> You seem to have a stuck-key problem with your keyboard. I
suggest you get a can of air and give your keyboard a good blow.
>
> --
> Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk
> CrossWorks for ARM, MSP430, AVR, MAXQ, and now Cortex-M3 processors
>
Hi,

The WatchDog module can be configured as either a watchdog or a
interval timer,WDT_MDLY_32 provides 32ms interval.
If you are using IAR embedded system,you can find the watchdog timer
definition in the .h header files
C:\Program Files\IAR Systems\Embedded Workbench 5.0\430\inc

If need to learn MSP430,go through the online training.
http://training.ti.com/courses/CourseCatalog.asp?iGID=1062

Re: help needed with interfacing 3-axis accelerometer with MSP430F2013

2008-09-03T18:15:39Z

For most accelerometer applications the SD16 is not a good choice, since
the measurements are not even close to being time aligned. This slew
means that the motion relationships between axes cannot be relied upon.
You are better off using either a digital output sensor, such as the PWM
output, or one with a serial output, since in the first case the micro
in edge trigger mode will store edges simultaneously, even though they
are not accessed precisely together, while in the serial systems most of
them convert sycnhronously so that data is time aligned. The downside to
most serial systems is that they limit each result to 8 bits. The next
best option would be to use a device with a SAR converter, such as the
2012,. Even though these are not sampled synchronously, so there is
still some time skew, the delay between samples can be much shorter than
with the Sd16 module, for the same resolution.

if you're stuck wit the 2013 then follow Juans recommendations.

Al

Chinmay Manohar wrote:

>wondering if anyone has tried using the SD16 on MSP430F2013 configured
>to do AtoD conversion on multiple (external) input channels. So far
>I've been able to read a single axis on the accelerometer, reading all
>3 axes in sequential pattern has not been possible so far. any help /
>guidance is highly appreciated...
>
>thanks
>C
>
>
>------------------------------------
>
>To unsubscribe from the msp430 group, send an email to:
>msp430-unsubscribe@...
>
>Yahoo! Groups Links
>
>
>
>
>
>
>

RE: Re: Can any plz explain this

2008-09-03T17:24:08Z

Hi,

> Hiyaa,,,
> I was going through the example program from TI about use of ADC,
> In this program, their is one instruction.
> WDTCTL = WDT_MDLY_32; // WDT Timer interval
> I have gone through User guide but didnt get how watchdog interval is set,
> actually what is this WDT_MDLY_32.
> Plz help me outttttt....
> Navvvvv !

You seem to have a stuck-key problem with your keyboard. I suggest you get a can of air and give your keyboard a good blow.

--
Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk
CrossWorks for ARM, MSP430, AVR, MAXQ, and now Cortex-M3 processors

RS232 with MSP-EXP430FG4618 Experimenter Board

2008-09-03T17:09:13Z

Hi,

Would you please provide more information about how to use the RS232 in MSP-EXP430FG4618 Experimenter Board?
The slau214a.pdf document on www.ti.com did not give enough.

Can I use example code in slac129a.zip for MSP430FG4618? But how can I relate its pins to the RS232 in MSP-EXP430FG4618 Experimenter Board?
Thanks,

Raymond

__________________________________________________________________
Yahoo! Canada Toolbar: Search from anywhere on the web, and bookmark your favourite sites. Download it now at
http://ca.toolbar.yahoo.com.

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

Re: Re: Can any plz explain this

2008-09-03T17:09:07Z

Hiyaa,,,
I was going through the example program from TI about use of ADC,
In this program, their is one instruction.
WDTCTL = WDT_MDLY_32; // WDT Timer interval
I have gone through User guide but didnt get how watchdog interval is set, actually what is this WDT_MDLY_32.
Plz help me outttttt....
Navvvvv !

-

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

IAR startup workspace list

2008-09-03T16:13:30Z

How can I clear the workspace list when IAR starts up?

Thank you,

A

Re: help needed with interfacing 3-axis accelerometer with MSP430F2013

2008-09-03T15:18:36Z

--- On Wed, 9/3/08, Chinmay Manohar <manohar.chinmay@...> wrote:

> From: Chinmay Manohar <manohar.chinmay@...>
> Subject: [msp430] help needed with interfacing 3-axis accelerometer with MSP430F2013
> To: msp430@...
> Date: Wednesday, September 3, 2008, 2:06 PM
> wondering if anyone has tried using the SD16 on MSP430F2013
> configured
> to do AtoD conversion on multiple (external) input
> channels. So far
> I've been able to read a single axis on the
> accelerometer, reading all
> 3 axes in sequential pattern has not been possible so far.
> any help /
> guidance is highly appreciated...
>
> thanks
> C

Hello C.
I am using an F2013 for converting 3 channels: 2 bipolar differential, 1 unipolar.
First of all, you have to set P1SEL bits to 1 for the input pins of the SD16 channels being used. Then, in order for the SD16 to work correctly, you must only enable the analog input on SD16AE register for the channel being converted. Also, since you are switching channels you must set SD16INTDLY_X to 3 or 4, in order to obtain a valid result. Finally, if you are using the internal refference generator AND channel 1 in differential mode (e.g A1+ - A1-), P1SEL.3 must be set to 0, otherwise, the reference voltage will be buffered on P1.3 pin and might damage whatever you are meassuring. That's all I can think of.
Kind regards,
Juan

RE: Re: Can any plz explain this

2008-09-03T15:17:34Z

Tom

While I do appreciate the advice that you put forth on the mailing list
and I do value your experience and knowledge, the continuing
self-promotion is starting to wear thin. In the case below, you do not
actually offer advice but instead just ask people to buy your book. It
is one thing to suggest a book once or twice. I think there were three
cases today alone where you recommended buying the book without actually
offering advice.

Respectfully

Dan

________________________________

From: msp430@... [mailto:msp430@...] On Behalf
Of Tom Baugh
Sent: Wednesday, September 03, 2008 2:33 PM
To: msp430@...
Subject: [msp430] Re: Can any plz explain this

Nav,

I think a great place to start to help understanding that sample
program is to read the new book, MSP430 Microcontroller Basics, by
John Davies:

http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%
<http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%25>
2Fwww.amazon.com%2FMSP430-Microcontroller-Basics-John-Davies%2Fdp%
2F0750682760%3Fie%3DUTF8%26s%3Dbooks%26qid%3D1220014595%26sr%3D8-
2&tag=softcom-20&linkCode=ur2&camp=1789&creative=9325

After that book, you will then be ready to use the state-based
approach that we have used with the MSP430 world for a decade. This
approach is provided in detail in our book MSP430 State Machine
Programming:

http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%
<http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%25>
2Fwww.amazon.com%2FMSP430-State-Machine-Programming-ES2274%2Fdp%
2F0975475924%3Fie%3DUTF8%26s%3Dbooks%26qid%3D1214397954%26sr%3D8-
1&tag=softcom-20&linkCode=ur2&camp=1789&creative=9325

If those links don't work, then search amazon.com for MSP430 as one
word. John's book and ours will be at the top of the list. The pair
of these books, studied intently for a few weeks, will fill in a lot
of the gaps. Also, after working the exercises in our book you will
have a level of architectural expertise that would otherwise take
years to learn. This is like taking a MSP430 course in a few weeks
for less than $100.

You can find reviews of our book elsewhere on this group, but let me
know if you have any questions.

Tom

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

help needed with interfacing 3-axis accelerometer with MSP430F2013

2008-09-03T14:06:49Z

wondering if anyone has tried using the SD16 on MSP430F2013 configured
to do AtoD conversion on multiple (external) input channels. So far
I've been able to read a single axis on the accelerometer, reading all
3 axes in sequential pattern has not been possible so far. any help /
guidance is highly appreciated...

thanks
C

Re: Can any plz explain this

2008-09-03T12:33:16Z

Nav,

I think a great place to start to help understanding that sample
program is to read the new book, MSP430 Microcontroller Basics, by
John Davies:

http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%
2Fwww.amazon.com%2FMSP430-Microcontroller-Basics-John-Davies%2Fdp%
2F0750682760%3Fie%3DUTF8%26s%3Dbooks%26qid%3D1220014595%26sr%3D8-
2&tag=softcom-20&linkCode=ur2&camp=1789&creative=9325

After that book, you will then be ready to use the state-based
approach that we have used with the MSP430 world for a decade. This
approach is provided in detail in our book MSP430 State Machine
Programming:

http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%
2Fwww.amazon.com%2FMSP430-State-Machine-Programming-ES2274%2Fdp%
2F0975475924%3Fie%3DUTF8%26s%3Dbooks%26qid%3D1214397954%26sr%3D8-
1&tag=softcom-20&linkCode=ur2&camp=1789&creative=9325

If those links don't work, then search amazon.com for MSP430 as one
word. John's book and ours will be at the top of the list. The pair
of these books, studied intently for a few weeks, will fill in a lot
of the gaps. Also, after working the exercises in our book you will
have a level of architectural expertise that would otherwise take
years to learn. This is like taking a MSP430 course in a few weeks
for less than $100.

You can find reviews of our book elsewhere on this group, but let me
know if you have any questions.

Tom

Re: interrupt priority "overrride"

2008-09-03T12:27:55Z

Stefan,

I agree with OCY and Dan and their architectural comments about this
program. I think from what you've said that this is a perfect example
of a program that needs to be written using an interrupt-driven state
machine. We discuss this approach in detail in our book MSP430 State
Machine Programming, available on amazon.com:

http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%
2Fwww.amazon.com%2FMSP430-State-Machine-Programming-ES2274%2Fdp%
2F0975475924%3Fie%3DUTF8%26s%3Dbooks%26qid%3D1214397954%26sr%3D8-
1&tag=softcom-20&linkCode=ur2&camp=1789&creative=9325

This book is written for our ES2274 board, but the approach given is
suitable for any MSP430 board with suitable porting of the examples, of
course.

Tom

RE: Re: interrupt priority "overrride"

2008-09-03T12:18:34Z

There is one statement below that worries me. Interrupts are more
difficult to debug and "interrupt" the normal flow of the program. It
has always been my view that interrupts should only do the absolute
minimum needed. Usually this is setting a flag, moving the contents of
a register, or incrementing a pointer. Something simple. No math
allowed, nothing that consumes time. This isn't always possible but if
your code forces you to reenable interrupts while in the ISR then
perhaps you should take a step back and evaluate how you are doing what
you are doing. There is likely a simpler more predictable way to do it.
The line I have trouble with is

This sequence is relative slow

This tells me that this does not belong in an interrupt.

Dan

________________________________

From: msp430@... [mailto:msp430@...] On Behalf
Of old_cow_yellow
Sent: Wednesday, September 03, 2008 9:10 AM
To: msp430@...
Subject: [msp430] Re: interrupt priority "overrride"

What you did is correct. But there are simpler ways to do it. For
example, you could have just include the keyboard scaning as part of
the timer isr. This saves execution time to do the pushes, pops and
extra return. (The code is shorter.)

--- In msp430@... <mailto:msp430%40yahoogroups.com> ,
"stefandk63" <stefan63@...> wrote:

>
> Hi , people,
> I have keyboard scaning sequence inside TimerB interrupt.
> This sequence is relative slow, so its possible to lose bit/symbol
> in software UART ( tied to TimerA). My intention is to make follow:
>
> TimerB_ISR:
> push r15
> ;...
>
> mov #keybard_scanproc,r15
> push r15
> push SR
> reti
>
> keybard_scanproc:
> ;.....
> pop r15
> pop SR
> ret
>
> Is this correct way?
> regards
>

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

Re: Can any plz explain this

2008-09-03T11:54:09Z

Hi, you need to read the datasheet for your microcontroller.
you'll see the meaning for each register there, including use of pins for ADC converter and use of other peripherals....

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