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Discussion Groups | TMS320C28x | Newbie to DSP seeks your 'HELP'
Technical discussions about the TI C28x DSPs (including the C2810, C2811, C2812, F2801, F2806, F2808, F2810,, F2811, F2812, R2811 and R2812).
Newbie to DSP seeks your 'HELP' - dhavalshah82 - Dec 8 20:58:00 2005
Hi Everybody,
I am a new member to this group. Thanks to the mod/owner who started
this yahoo group. I am a newbie to DSP programming and just commenced
my project using TMSDSPF2812. I have to develop V/F control inverter
for motor applicaiton.
While debugging a frustrating problem, I found that _IQsin function
was not returning proper value, the _IQsin wont work as specified in
IQMath document.
Do you have any clue of what could be the possible reason or a way to
get around it.
Thanks.
- Dhaval
-------------------------
_iq29 in2, out2;
void main(void )
{
in2=_IQ29(0.25*PI);
out2=_IQ29sin(in2);
}
------------------------------------- Expected values;
in2= 0x1921EA40 h
out2= 0x16A09E66 h
Actual values;
in2= 0x1921EA40 h
out2=0xE0473A3D h (this is totally wrong.. dont know why)
Please help.. I am a newbie and frustrated by this simple problem. I
would really appreciate your support and guidance.
Thanks.
- Dhaval Shah
http://www.ece.uvic.ca/~dhavalss/
(You need to be a member of c28x -- send a blank email to c28x-subscribe@yahoogroups.com )
Re: Newbie to DSP seeks your 'HELP' - chirag jagadish - Dec 10 12:36:00 2005
hi dhaval,
how r u going about debugging the code
r u using watch window
in case u r using watch window,
before u display the result in watch window remember to convert the IQ number into a float and assign it to a temporary float variable and then watch it on the watch window
if u r not using watch window, then the problem might be different
if u give more info we can all try
bye dhavalshah82 <dhavalshah82@dhav...> wrote: Hi Everybody,
I am a new member to this group. Thanks to the mod/owner who started
this yahoo group. I am a newbie to DSP programming and just commenced
my project using TMSDSPF2812. I have to develop V/F control inverter
for motor applicaiton.
While debugging a frustrating problem, I found that _IQsin function
was not returning proper value, the _IQsin wont work as specified in
IQMath document.
Do you have any clue of what could be the possible reason or a way to
get around it.
Thanks.
- Dhaval
-------------------------
_iq29 in2, out2;
void main(void )
{
in2=_IQ29(0.25*PI);
out2=_IQ29sin(in2);
}
------------------------------------- Expected values;
in2= 0x1921EA40 h
out2= 0x16A09E66 h
Actual values;
in2= 0x1921EA40 h
out2=0xE0473A3D h (this is totally wrong.. dont know why)
Please help.. I am a newbie and frustrated by this simple problem. I
would really appreciate your support and guidance.
Thanks.
- Dhaval Shah
http://www.ece.uvic.ca/~dhavalss/
(You need to be a member of c28x -- send a blank email to c28x-subscribe@yahoogroups.com )
how r u going about debugging the code
r u using watch window
in case u r using watch window,
before u display the result in watch window remember to convert the IQ number into a float and assign it to a temporary float variable and then watch it on the watch window
if u r not using watch window, then the problem might be different
if u give more info we can all try
bye dhavalshah82 <dhavalshah82@dhav...> wrote: Hi Everybody,
I am a new member to this group. Thanks to the mod/owner who started
this yahoo group. I am a newbie to DSP programming and just commenced
my project using TMSDSPF2812. I have to develop V/F control inverter
for motor applicaiton.
While debugging a frustrating problem, I found that _IQsin function
was not returning proper value, the _IQsin wont work as specified in
IQMath document.
Do you have any clue of what could be the possible reason or a way to
get around it.
Thanks.
- Dhaval
-------------------------
_iq29 in2, out2;
void main(void )
{
in2=_IQ29(0.25*PI);
out2=_IQ29sin(in2);
}
------------------------------------- Expected values;
in2= 0x1921EA40 h
out2= 0x16A09E66 h
Actual values;
in2= 0x1921EA40 h
out2=0xE0473A3D h (this is totally wrong.. dont know why)
Please help.. I am a newbie and frustrated by this simple problem. I
would really appreciate your support and guidance.
Thanks.
- Dhaval Shah
http://www.ece.uvic.ca/~dhavalss/
(You need to be a member of c28x -- send a blank email to c28x-subscribe@yahoogroups.com )
Re: Newbie to DSP seeks your 'HELP' - chirag jagadish - Dec 12 11:16:00 2005
hi,
try pre multiplying the .25 * PI , put it in a float variable
and then use the convert function _IQ29( )
bye
dhavalshah82 <dhavalshah82@dhav...> wrote:
Hi Everybody,
I am a new member to this group. Thanks to the mod/owner who started
this yahoo group. I am a newbie to DSP programming and just commenced
my project using TMSDSPF2812. I have to develop V/F control inverter
for motor applicaiton.
While debugging a frustrating problem, I found that _IQsin function
was not returning proper value, the _IQsin wont work as specified in
IQMath document.
Do you have any clue of what could be the possible reason or a way to
get around it.
Thanks.
- Dhaval
-------------------------
_iq29 in2, out2;
void main(void )
{
in2=_IQ29(0.25*PI);
out2=_IQ29sin(in2);
}
------------------------------------- Expected values;
in2= 0x1921EA40 h
out2= 0x16A09E66 h
Actual values;
in2= 0x1921EA40 h
out2=0xE0473A3D h (this is totally wrong.. dont know why)
Please help.. I am a newbie and frustrated by this simple problem. I
would really appreciate your support and guidance.
Thanks.
- Dhaval Shah
http://www.ece.uvic.ca/~dhavalss/
(You need to be a member of c28x -- send a blank email to c28x-subscribe@yahoogroups.com )
try pre multiplying the .25 * PI , put it in a float variable
and then use the convert function _IQ29( )
bye
dhavalshah82 <dhavalshah82@dhav...> wrote:
Hi Everybody,
I am a new member to this group. Thanks to the mod/owner who started
this yahoo group. I am a newbie to DSP programming and just commenced
my project using TMSDSPF2812. I have to develop V/F control inverter
for motor applicaiton.
While debugging a frustrating problem, I found that _IQsin function
was not returning proper value, the _IQsin wont work as specified in
IQMath document.
Do you have any clue of what could be the possible reason or a way to
get around it.
Thanks.
- Dhaval
-------------------------
_iq29 in2, out2;
void main(void )
{
in2=_IQ29(0.25*PI);
out2=_IQ29sin(in2);
}
------------------------------------- Expected values;
in2= 0x1921EA40 h
out2= 0x16A09E66 h
Actual values;
in2= 0x1921EA40 h
out2=0xE0473A3D h (this is totally wrong.. dont know why)
Please help.. I am a newbie and frustrated by this simple problem. I
would really appreciate your support and guidance.
Thanks.
- Dhaval Shah
http://www.ece.uvic.ca/~dhavalss/
(You need to be a member of c28x -- send a blank email to c28x-subscribe@yahoogroups.com )
Re: Newbie to DSP seeks your 'HELP' - dhavalshah82 - Dec 19 20:42:00 2005
Thank you Chirag,
I found the solution to problem. The issue was with the IQmath.Lib
included in the project was corrupted. Fixed it with new file and now
all is fine. I finished the project too.. implementing a v/f control
for an Induction motor using SVPWM. By the way, I am working on
Induction Motor/Inverter/Motor Faultdiagnosis area. If there is anyone
on the group working on similar topic. I would be glad to know. Also I
will be glad to help any newbie like me needing any guidance with
F2812 and powerelectronics/motor control.
cheers,
Dhaval Shah
dhavalshah82@dhav...
www.ece.uvic.ca/~dhavalss/
--- In c28x@c28x..., chirag jagadish <chirag_jagadish@y...> wrote:
>
> hi dhaval,
> how r u going about debugging the code
> r u using watch window
> in case u r using watch window,
> before u display the result in watch window remember to convert
the IQ number into a float and assign it to a temporary float
variable and then watch it on the watch window
> if u r not using watch window, then the problem might be different
> if u give more info we can all try
>
> bye > dhavalshah82 <dhavalshah82@y...> wrote: Hi Everybody,
>
> I am a new member to this group. Thanks to the mod/owner who started
> this yahoo group. I am a newbie to DSP programming and just commenced
> my project using TMSDSPF2812. I have to develop V/F control inverter
> for motor applicaiton.
>
> While debugging a frustrating problem, I found that _IQsin function
> was not returning proper value, the _IQsin wont work as specified in
> IQMath document.
>
> Do you have any clue of what could be the possible reason or a way to
> get around it.
>
> Thanks.
>
> - Dhaval
>
> -------------------------
> _iq29 in2, out2;
>
> void main(void )
> {
> in2=_IQ29(0.25*PI);
> out2=_IQ29sin(in2);
> }
> ------------------------------------- > Expected values;
> in2= 0x1921EA40 h
> out2= 0x16A09E66 h
>
> Actual values;
> in2= 0x1921EA40 h
> out2=0xE0473A3D h (this is totally wrong.. dont know why)
>
> Please help.. I am a newbie and frustrated by this simple problem. I
> would really appreciate your support and guidance.
>
> Thanks.
>
> - Dhaval Shah
> http://www.ece.uvic.ca/~dhavalss/
(You need to be a member of c28x -- send a blank email to c28x-subscribe@yahoogroups.com )
I found the solution to problem. The issue was with the IQmath.Lib
included in the project was corrupted. Fixed it with new file and now
all is fine. I finished the project too.. implementing a v/f control
for an Induction motor using SVPWM. By the way, I am working on
Induction Motor/Inverter/Motor Faultdiagnosis area. If there is anyone
on the group working on similar topic. I would be glad to know. Also I
will be glad to help any newbie like me needing any guidance with
F2812 and powerelectronics/motor control.
cheers,
Dhaval Shah
dhavalshah82@dhav...
www.ece.uvic.ca/~dhavalss/
--- In c28x@c28x..., chirag jagadish <chirag_jagadish@y...> wrote:
>
> hi dhaval,
> how r u going about debugging the code
> r u using watch window
> in case u r using watch window,
> before u display the result in watch window remember to convert
the IQ number into a float and assign it to a temporary float
variable and then watch it on the watch window
> if u r not using watch window, then the problem might be different
> if u give more info we can all try
>
> bye > dhavalshah82 <dhavalshah82@y...> wrote: Hi Everybody,
>
> I am a new member to this group. Thanks to the mod/owner who started
> this yahoo group. I am a newbie to DSP programming and just commenced
> my project using TMSDSPF2812. I have to develop V/F control inverter
> for motor applicaiton.
>
> While debugging a frustrating problem, I found that _IQsin function
> was not returning proper value, the _IQsin wont work as specified in
> IQMath document.
>
> Do you have any clue of what could be the possible reason or a way to
> get around it.
>
> Thanks.
>
> - Dhaval
>
> -------------------------
> _iq29 in2, out2;
>
> void main(void )
> {
> in2=_IQ29(0.25*PI);
> out2=_IQ29sin(in2);
> }
> ------------------------------------- > Expected values;
> in2= 0x1921EA40 h
> out2= 0x16A09E66 h
>
> Actual values;
> in2= 0x1921EA40 h
> out2=0xE0473A3D h (this is totally wrong.. dont know why)
>
> Please help.. I am a newbie and frustrated by this simple problem. I
> would really appreciate your support and guidance.
>
> Thanks.
>
> - Dhaval Shah
> http://www.ece.uvic.ca/~dhavalss/
(You need to be a member of c28x -- send a blank email to c28x-subscribe@yahoogroups.com )