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Thread
2006-02-24 by punkandsska123
Hi, I recently made the Jtag board from k9spud and I seem to have some problems with it. I tested the parrallel port with debug and it works. When I switch in Rowley Crosstudio and I try to connect the Wriggler I had a message box that say. Cannot Identify Target Check JTAG connection What do you think the problem is. Thanks a lot.
2006-02-24 by punkandsska123
--- In lpc2000@yahoogroups.com, "punkandsska123" <jeromerivard@...> wrote: > > Hi, I recently made the Jtag board from k9spud and I seem to have some > problems with it. I tested the parrallel port with debug and it > works. When I switch in Rowley Crosstudio and I try to connect the > Wriggler I had a message box that say. > > Cannot Identify Target > Check JTAG connection > > > What do you think the problem is. > > Thanks a lot. > I forgot to says That I use a Olimex Board with a Philips 2148.
2006-02-24 by Leon Heller
----- Original Message -----
From: "punkandsska123" <jeromerivard@...> To: <lpc2000@yahoogroups.com> Sent: Friday, February 24, 2006 6:10 PM Subject: [lpc2000] Jtag from k9spud > Hi, I recently made the Jtag board from k9spud and I seem to have some > problems with it. I tested the parrallel port with debug and it > works. When I switch in Rowley Crosstudio and I try to connect the > Wriggler I had a message box that say. > > Cannot Identify Target > Check JTAG connection > > > What do you think the problem is. Difficult to say. AFAIK the designer has never built one and tested it. Try building mine (jtag.zip), it definitely works. Leon
2006-02-24 by punkandsska123
--- In lpc2000@yahoogroups.com, "Leon Heller" <leon.heller@...> wrote: > > ----- Original Message ----- > From: "punkandsska123" <jeromerivard@...> > To: <lpc2000@yahoogroups.com> > Sent: Friday, February 24, 2006 6:10 PM > Subject: [lpc2000] Jtag from k9spud > > > > Hi, I recently made the Jtag board from k9spud and I seem to have some > > problems with it. I tested the parrallel port with debug and it > > works. When I switch in Rowley Crosstudio and I try to connect the > > Wriggler I had a message box that say. > > > > Cannot Identify Target > > Check JTAG connection > > > > > > What do you think the problem is. > > Difficult to say. AFAIK the designer has never built one and tested it. Try > building mine (jtag.zip), it definitely works. > > Leon > And where can I download it ?
2006-02-24 by Paul Curtis
The cannot identify means that the CPU ID read back is either all zeroes or all ones. This can be caused by a number of things, all bad: #1. TDO not correctly wired up so always reads 1. #2. JTAG going too fast, set the JTAG divisor lower. As you are using an LPC2148, there is no possibility of adaptive clocking, so depending upon how fast your CPU starts up, you may need to use a larger JTAG divisor. #3. TCK, TMS, and TDI not correctly wired. In fact, any of these not wired correctly will cause JTAG failure. So, all in all, check out your circuit... -- Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk CrossWorks for MSP430, ARM, AVR and now MAXQ processors
> -----Original Message----- > From: punkandsska123 [mailto:jeromerivard@...] > Sent: 24 February 2006 18:16 > To: lpc2000@yahoogroups.com > Subject: [lpc2000] Jtag from k9spud > > Hi, I have make the Wriggler from www.k9spud.com/jtag. > > I try to use it with Rowley CrossStudio for Arm but it seems > not works. > > A message box say : > > Cannot Identify Target > Check JTAG connection. > > > I use a Olimex board with a Philips 2148. My original wriggler work > perfectly with crossstudio so parrallel port is fonctional. > > What is the problem you think. ? > > > > > > > Yahoo! Groups Links > > > > > > > > >
2006-02-24 by Paul Curtis
Have you ensured the DBG JTAG jumper is installed (shorted)? -- Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk CrossWorks for MSP430, ARM, AVR and now MAXQ processors
> -----Original Message----- > From: punkandsska123 [mailto:jeromerivard@...] > Sent: 24 February 2006 18:18 > To: lpc2000@yahoogroups.com > Subject: [lpc2000] Re: Jtag from k9spud > > --- In lpc2000@yahoogroups.com, "punkandsska123" <jeromerivard@...> > wrote: > > > > Hi, I recently made the Jtag board from k9spud and I seem to have > some > > problems with it. I tested the parrallel port with debug and it > > works. When I switch in Rowley Crosstudio and I try to connect the > > Wriggler I had a message box that say. > > > > Cannot Identify Target > > Check JTAG connection > > > > > > What do you think the problem is. > > > > Thanks a lot. > > > > I forgot to says That I use a Olimex Board with a Philips 2148. > > > > > > > Yahoo! Groups Links > > > > > > > > >
2006-02-24 by Leon Heller
----- Original Message -----
From: "punkandsska123" <jeromerivard@...> To: <lpc2000@yahoogroups.com> Sent: Friday, February 24, 2006 6:26 PM Subject: [lpc2000] Re: Jtag from k9spud > --- In lpc2000@yahoogroups.com, "Leon Heller" <leon.heller@...> > wrote: >> >> ----- Original Message ----- >> From: "punkandsska123" <jeromerivard@...> >> To: <lpc2000@yahoogroups.com> >> Sent: Friday, February 24, 2006 6:10 PM >> Subject: [lpc2000] Jtag from k9spud >> >> >> > Hi, I recently made the Jtag board from k9spud and I seem to > have some >> > problems with it. I tested the parrallel port with debug and it >> > works. When I switch in Rowley Crosstudio and I try to connect > the >> > Wriggler I had a message box that say. >> > >> > Cannot Identify Target >> > Check JTAG connection >> > >> > >> > What do you think the problem is. >> >> Difficult to say. AFAIK the designer has never built one and > tested it. Try >> building mine (jtag.zip), it definitely works. >> >> Leon >> > And where can I download it ? It's in the Group Files section. Leon
2006-02-24 by Paul Curtis
Hi, > Thanks Paul for help me. > > The jumper is set and about the #2. > > > And TDO seems to be ok. > > And what is the CPU speed is needed ? > > My dividor is already to one in property. Try increasing it, say, to 10. If 10, doesn't work, try 100. If that doesn't work, your JTAG unit or board is not working properly. -- Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk CrossWorks for MSP430, ARM, AVR and now MAXQ processors
2006-02-24 by punkandsska123
--- In lpc2000@yahoogroups.com, "Leon Heller" <leon.heller@...> wrote: > > ----- Original Message ----- > From: "punkandsska123" <jeromerivard@...> > To: <lpc2000@yahoogroups.com> > Sent: Friday, February 24, 2006 6:26 PM > Subject: [lpc2000] Re: Jtag from k9spud > > > > --- In lpc2000@yahoogroups.com, "Leon Heller" <leon.heller@> > > wrote: > >> > >> ----- Original Message ----- > >> From: "punkandsska123" <jeromerivard@> > >> To: <lpc2000@yahoogroups.com> > >> Sent: Friday, February 24, 2006 6:10 PM > >> Subject: [lpc2000] Jtag from k9spud > >> > >> > >> > Hi, I recently made the Jtag board from k9spud and I seem to > > have some > >> > problems with it. I tested the parrallel port with debug and it > >> > works. When I switch in Rowley Crosstudio and I try to connect > > the > >> > Wriggler I had a message box that say. > >> > > >> > Cannot Identify Target > >> > Check JTAG connection > >> > > >> > > >> > What do you think the problem is. > >> > >> Difficult to say. AFAIK the designer has never built one and > > tested it. Try > >> building mine (jtag.zip), it definitely works. > >> > >> Leon > >> > > And where can I download it ? > > It's in the Group Files section. > > Leon > Ok thanks I found it. And your leon is compatible with rowley ?
2006-02-24 by punkandsska123
--- In lpc2000@yahoogroups.com, "Paul Curtis" <plc@...> wrote: > > Have you ensured the DBG JTAG jumper is installed (shorted)? > > -- > Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk > CrossWorks for MSP430, ARM, AVR and now MAXQ processors > > > -----Original Message----- > > From: punkandsska123 [mailto:jeromerivard@...] > > Sent: 24 February 2006 18:18 > > To: lpc2000@yahoogroups.com > > Subject: [lpc2000] Re: Jtag from k9spud > > > > --- In lpc2000@yahoogroups.com, "punkandsska123" <jeromerivard@> > > wrote: > > > > > > Hi, I recently made the Jtag board from k9spud and I seem to have > > some > > > problems with it. I tested the parrallel port with debug and it > > > works. When I switch in Rowley Crosstudio and I try to connect the > > > Wriggler I had a message box that say. > > > > > > Cannot Identify Target > > > Check JTAG connection > > > > > > > > > What do you think the problem is. > > > > > > Thanks a lot. > > > > > > > I forgot to says That I use a Olimex Board with a Philips 2148. > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > Thanks Paul for help me. The jumper is set and about the #2. And TDO seems to be ok. And what is the CPU speed is needed ? My dividor is already to one in property.
2006-02-24 by Leon Heller
----- Original Message -----
From: "punkandsska123" <jeromerivard@...> To: <lpc2000@yahoogroups.com> Sent: Friday, February 24, 2006 7:13 PM Subject: [lpc2000] Re: Jtag from k9spud > --- In lpc2000@yahoogroups.com, "Leon Heller" <leon.heller@...> > wrote: >> >> ----- Original Message ----- >> From: "punkandsska123" <jeromerivard@...> >> To: <lpc2000@yahoogroups.com> >> Sent: Friday, February 24, 2006 6:26 PM >> Subject: [lpc2000] Re: Jtag from k9spud >> >> >> > --- In lpc2000@yahoogroups.com, "Leon Heller" <leon.heller@> >> > wrote: >> >> >> >> ----- Original Message ----- >> >> From: "punkandsska123" <jeromerivard@> >> >> To: <lpc2000@yahoogroups.com> >> >> Sent: Friday, February 24, 2006 6:10 PM >> >> Subject: [lpc2000] Jtag from k9spud >> >> >> >> >> >> > Hi, I recently made the Jtag board from k9spud and I seem to >> > have some >> >> > problems with it. I tested the parrallel port with debug and > it >> >> > works. When I switch in Rowley Crosstudio and I try to > connect >> > the >> >> > Wriggler I had a message box that say. >> >> > >> >> > Cannot Identify Target >> >> > Check JTAG connection >> >> > >> >> > >> >> > What do you think the problem is. >> >> >> >> Difficult to say. AFAIK the designer has never built one and >> > tested it. Try >> >> building mine (jtag.zip), it definitely works. >> >> >> >> Leon >> >> >> > And where can I download it ? >> >> It's in the Group Files section. >> >> Leon >> > Ok thanks I found it. > > And your leon is compatible with rowley ? Yes, it works OK with their software. Just select 20-pin Wiggler. I prefer the Rowley CrossConnect that I have, of course. It's a lot faster and uses USB. I also have a genuine Wiggler and an Amontec Chameleon - a plethora of JTAG interfaces. 8-) Leon -- Leon Heller, G1HSM leon.heller@... http://www.geocities.com/leon_heller
2006-02-24 by Herbert Demmel
Hi,
I seem to miss something with setting up PWM5 output - the routine below
sometimes works, sometimes not (depending non additional code - this
versions below currentlly does NOT work).
Any idea what I miss to setup?
Thanks for your input.
Regards
Herbert
#include <LPC213x.H> /* LPC213x definitions */
#define TICKS_PER_US 15
void io_alarm_out(unsigned int freq)
{
// match register 0 controls the cycle frequency
PWMMR0 = 1000000 * TICKS_PER_US / freq;
// we want to have a duty cycle of 50% so always set PWMMR5 to
half of PWMMR0
PWMMR5 = PWMMR0 / 2;
// enable PWM5 output
PWMPCR |= (0x01 << 13);
}
int main(void)
{
// --- PWM5 setup ---
// Enable P0.21 to be PWM5
PINSEL1 |= (0x01 << 10);
PWMTCR = 1; // enable PWM timer, let shadow register
disabled
// reset PWM timer when PWMMR0 matches
PWMMCR = 0x2;
// gives 1000Hz
io_alarm_out(1000);
while (1)
;
}
----------------------------------------------------------
demmel products
Radnitzkygasse 43
A-1100 Vienna / Austria / Europe
Voice: +43-1-6894700-0
Fax: +43-1-6894700-40
Email: dh@...
WWW: http://www.demmel.com2006-02-25 by Sten
Herbert Demmel wrote:
> Hi,
>
> I seem to miss something with setting up PWM5 output - the routine below
> sometimes works, sometimes not (depending non additional code - this
> versions below currentlly does NOT work).
>
> Any idea what I miss to setup?
>
> Thanks for your input.
>
> Regards
> Herbert
>
> #include <LPC213x.H> /* LPC213x definitions */
>
> #define TICKS_PER_US 15
>
> void io_alarm_out(unsigned int freq)
> {
PWMTCR = (1ul << 0) | (1ul << 1); /* Enter reset state and force counter to zero*/
> // match register 0 controls the cycle frequency
> PWMMR0 = 1000000 * TICKS_PER_US / freq;
>
> // we want to have a duty cycle of 50% so always set PWMMR5 to
> half of PWMMR0
> PWMMR5 = PWMMR0 / 2;
>
> // enable PWM5 output
> PWMPCR |= (0x01 << 13);
PWMTCR = (1ul << 0) | (1ul << 3); /* Re-enable PWM */
> }
>
> int main(void)
> {
> // --- PWM5 setup ---
>
> // Enable P0.21 to be PWM5
> PINSEL1 |= (0x01 << 10);
> PWMTCR = 1; // enable PWM timer, let shadow register
> disabled
>
> // reset PWM timer when PWMMR0 matches
// PWMMCR = 0x2;
>
> // gives 1000Hz
> io_alarm_out(1000);
>
> while (1)
> ;
> }
>
Hallo Herbert,
Mmmmh, don't you need to turn on PWM module in PCONP? Or do you let all peripherials active on
startup by default?
But bit #3 in PWMTCR enables PWM module. Description of this bit says:
"When one, PWM mode is enabled. PWM mode causes shadow registers..." (2294's datasheet, p.233)
After you have enabled PWM module (if bit #3 in PWMTCR is set) and set up a value in a PWMMRx
register you just need to set the appropriated bit in PWMLER register to take effect of new PWMMRx
value.
You do not need using PWMLER register if you hold PWM in reset state during changing PWMMRx values
(see changes above).
Try it!
Sten
--
/************************************************
Do you need a tiny and efficient real time
operating system (RTOS) with a preemtive
multitasking for LPC2000 or AT91SAM7?
http://nanortos.net-attack.de/
Or some open-source tools and code for LPC2000?
http://www.net-attack.de/
************************************************/2006-02-25 by Sten
Sten wrote:
> Herbert Demmel wrote:
>
>>Hi,
>>
>>I seem to miss something with setting up PWM5 output - the routine below
>>sometimes works, sometimes not (depending non additional code - this
>>versions below currentlly does NOT work).
>>
>>Any idea what I miss to setup?
>>
>>Thanks for your input.
>>
>>Regards
>>Herbert
>>
>>#include <LPC213x.H> /* LPC213x definitions */
>>
>>#define TICKS_PER_US 15
>>
>>void io_alarm_out(unsigned int freq)
>>{
>
>
> PWMTCR = (1ul << 0) | (1ul << 1); /* Enter reset state and force counter to zero*/
>
>
>> // match register 0 controls the cycle frequency
>> PWMMR0 = 1000000 * TICKS_PER_US / freq;
>>
>> // we want to have a duty cycle of 50% so always set PWMMR5 to
>>half of PWMMR0
>> PWMMR5 = PWMMR0 / 2;
>>
>> // enable PWM5 output
>> PWMPCR |= (0x01 << 13);
>
>
> PWMTCR = (1ul << 0) | (1ul << 3); /* Re-enable PWM */
>
>
>>}
>>
>>int main(void)
>>{
>> // --- PWM5 setup ---
>>
>> // Enable P0.21 to be PWM5
>> PINSEL1 |= (0x01 << 10);
>> PWMTCR = 1; // enable PWM timer, let shadow register
>>disabled
>>
>> // reset PWM timer when PWMMR0 matches
>
> // PWMMCR = 0x2;
>
>> // gives 1000Hz
>> io_alarm_out(1000);
>>
>> while (1)
>> ;
>>}
>>
>
>
> Hallo Herbert,
>
> Mmmmh, don't you need to turn on PWM module in PCONP? Or do you let all peripherials active on
> startup by default?
>
> But bit #3 in PWMTCR enables PWM module. Description of this bit says:
> "When one, PWM mode is enabled. PWM mode causes shadow registers..." (2294's datasheet, p.233)
>
> After you have enabled PWM module (if bit #3 in PWMTCR is set) and set up a value in a PWMMRx
> register you just need to set the appropriated bit in PWMLER register to take effect of new PWMMRx
> value.
>
> You do not need using PWMLER register if you hold PWM in reset state during changing PWMMRx values
> (see changes above).
>
> Try it!
> Sten
>
Oooops, sorry! Do not comment PWMMCR in main(). But you can uncomment PWMTCR statement instead.
Sten
--
/************************************************
Do you need a tiny and efficient real time
operating system (RTOS) with a preemtive
multitasking for LPC2000 or AT91SAM7?
http://nanortos.net-attack.de/
Or some open-source tools and code for LPC2000?
http://www.net-attack.de/
************************************************/2006-02-25 by Herbert Demmel
Sten,
thank you for your valuable input. I've now changed the source code
according to your comments and turned on power for PWM0 (although it should
be on, the code below is the only code currently running) but it does not
work yet.
I'm using a LPC2136 with Keil C V.2.42
Any further ideas why the stuff does not work???
Regards
Herbert
-------------
#include <LPC213x.H> /* LPC213x definitions */
#define TICKS_PER_US 15
void io_alarm_out(unsigned int freq)
{
PWMTCR = (0x01 << 0) | (0x01 << 1); // Enter reset state and
force counter to zero
// match register 0 controls the cycle frequency
PWMMR0 = 1000000 * TICKS_PER_US / freq;
// we want to have a duty cycle of 50% so always set PWMMR5 to
half of PWMMR0
PWMMR5 = PWMMR0 / 2;
// enable PWM5 output
PWMPCR |= (0x01 << 13);
PWMTCR = (0x01 << 0) | (0x01 << 3); // Re-enable PWM
}
int main(void)
{
// Turn on power control for PWM0
PCONP |= (0x01 << 5);
// --- PWM5 setup ---
// Enable P0.21 to be PWM5
PINSEL1 |= (0x01 << 10);
// PWMTCR = 1; // enable PWM timer, let shadow register
disabled
// reset PWM timer when PWMMR0 matches
PWMMCR = 0x2;
// gives 1000Hz
io_alarm_out(1000);
while (1)
;
}
-------------
At 09:27 25.02.2006 +0100, you wrote:
>Sten wrote:
> > Herbert Demmel wrote:
> >
> >>Hi,
> >>
> >>I seem to miss something with setting up PWM5 output - the routine below
> >>sometimes works, sometimes not (depending non additional code - this
> >>versions below currentlly does NOT work).
> >>
> >>Any idea what I miss to setup?
> >>
> >>Thanks for your input.
> >>
> >>Regards
> >>Herbert
> >>
> >>#include <LPC213x.H> /* LPC213x definitions */
> >>
> >>#define TICKS_PER_US 15
> >>
> >>void io_alarm_out(unsigned int freq)
> >>{
> >
> >
> > PWMTCR = (1ul << 0) | (1ul << 1); /* Enter reset state and
> force counter to zero*/
> >
> >
> >> // match register 0 controls the cycle frequency
> >> PWMMR0 = 1000000 * TICKS_PER_US / freq;
> >>
> >> // we want to have a duty cycle of 50% so always set PWMMR5 to
> >>half of PWMMR0
> >> PWMMR5 = PWMMR0 / 2;
> >>
> >> // enable PWM5 output
> >> PWMPCR |= (0x01 << 13);
> >
> >
> > PWMTCR = (1ul << 0) | (1ul << 3); /* Re-enable PWM */
> >
> >
> >>}
> >>
> >>int main(void)
> >>{
> >> // --- PWM5 setup ---
> >>
> >> // Enable P0.21 to be PWM5
> >> PINSEL1 |= (0x01 << 10);
> >> PWMTCR = 1; // enable PWM timer, let shadow register
> >>disabled
> >>
> >> // reset PWM timer when PWMMR0 matches
> >
> > // PWMMCR = 0x2;
> >
> >> // gives 1000Hz
> >> io_alarm_out(1000);
> >>
> >> while (1)
> >> ;
> >>}
> >>
> >
> >
> > Hallo Herbert,
> >
> > Mmmmh, don't you need to turn on PWM module in PCONP? Or do you let all
> peripherials active on
> > startup by default?
> >
> > But bit #3 in PWMTCR enables PWM module. Description of this bit says:
> > "When one, PWM mode is enabled. PWM mode causes shadow registers..."
> (2294's datasheet, p.233)
> >
> > After you have enabled PWM module (if bit #3 in PWMTCR is set) and set
> up a value in a PWMMRx
> > register you just need to set the appropriated bit in PWMLER register
> to take effect of new PWMMRx
> > value.
> >
> > You do not need using PWMLER register if you hold PWM in reset state
> during changing PWMMRx values
> > (see changes above).
> >
> > Try it!
> > Sten
> >
>
>Oooops, sorry! Do not comment PWMMCR in main(). But you can uncomment
>PWMTCR statement instead.
>
> Sten
>
>--
>/************************************************
>Do you need a tiny and efficient real time
>operating system (RTOS) with a preemtive
>multitasking for LPC2000 or AT91SAM7?
>
> <http://nanortos.net-attack.de/>http://nanortos.net-attack.de/
>
>Or some open-source tools and code for LPC2000?
>
> <http://www.net-attack.de/>http://www.net-attack.de/
>
>************************************************/
>
>
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Voice: +43-1-6894700-0
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Email: dh@...
WWW: http://www.demmel.com
[Non-text portions of this message have been removed]2006-02-25 by Herbert Demmel
Sten,
Sorry, the code now works, I just forgot to enable the "Run application
after download" in my test program, so the test program never started (my
original application did and had the problem not to start the PWM).
Thanks a lot
Herbert
At 12:53 25.02.2006 +0100, you wrote:
>Sten,
>
>thank you for your valuable input. I've now changed the source code
>according to your comments and turned on power for PWM0 (although it should
>be on, the code below is the only code currently running) but it does not
>work yet.
>
>I'm using a LPC2136 with Keil C V.2.42
>
>Any further ideas why the stuff does not work???
>
>Regards
>Herbert
>
>-------------
>
>#include <LPC213x.H> /* LPC213x definitions */
>
>#define TICKS_PER_US 15
>
>void io_alarm_out(unsigned int freq)
>{
> PWMTCR = (0x01 << 0) | (0x01 << 1); // Enter reset state and
>force counter to zero
>
> // match register 0 controls the cycle frequency
> PWMMR0 = 1000000 * TICKS_PER_US / freq;
>
> // we want to have a duty cycle of 50% so always set PWMMR5 to
>half of PWMMR0
> PWMMR5 = PWMMR0 / 2;
>
> // enable PWM5 output
> PWMPCR |= (0x01 << 13);
>
> PWMTCR = (0x01 << 0) | (0x01 << 3); // Re-enable PWM
>}
>
>int main(void)
>{
> // Turn on power control for PWM0
> PCONP |= (0x01 << 5);
>
> // --- PWM5 setup ---
>
> // Enable P0.21 to be PWM5
> PINSEL1 |= (0x01 << 10);
> // PWMTCR = 1; // enable PWM timer, let shadow register
>disabled
>
> // reset PWM timer when PWMMR0 matches
> PWMMCR = 0x2;
>
> // gives 1000Hz
> io_alarm_out(1000);
>
> while (1)
> ;
>}
>-------------
>
>At 09:27 25.02.2006 +0100, you wrote:
> >Sten wrote:
> > > Herbert Demmel wrote:
> > >
> > >>Hi,
> > >>
> > >>I seem to miss something with setting up PWM5 output - the routine below
> > >>sometimes works, sometimes not (depending non additional code - this
> > >>versions below currentlly does NOT work).
> > >>
> > >>Any idea what I miss to setup?
> > >>
> > >>Thanks for your input.
> > >>
> > >>Regards
> > >>Herbert
> > >>
> > >>#include <LPC213x.H> /* LPC213x definitions */
> > >>
> > >>#define TICKS_PER_US 15
> > >>
> > >>void io_alarm_out(unsigned int freq)
> > >>{
> > >
> > >
> > > PWMTCR = (1ul << 0) | (1ul << 1); /* Enter reset state and
> > force counter to zero*/
> > >
> > >
> > >> // match register 0 controls the cycle frequency
> > >> PWMMR0 = 1000000 * TICKS_PER_US / freq;
> > >>
> > >> // we want to have a duty cycle of 50% so always set PWMMR5 to
> > >>half of PWMMR0
> > >> PWMMR5 = PWMMR0 / 2;
> > >>
> > >> // enable PWM5 output
> > >> PWMPCR |= (0x01 << 13);
> > >
> > >
> > > PWMTCR = (1ul << 0) | (1ul << 3); /* Re-enable PWM */
> > >
> > >
> > >>}
> > >>
> > >>int main(void)
> > >>{
> > >> // --- PWM5 setup ---
> > >>
> > >> // Enable P0.21 to be PWM5
> > >> PINSEL1 |= (0x01 << 10);
> > >> PWMTCR = 1; // enable PWM timer, let shadow register
> > >>disabled
> > >>
> > >> // reset PWM timer when PWMMR0 matches
> > >
> > > // PWMMCR = 0x2;
> > >
> > >> // gives 1000Hz
> > >> io_alarm_out(1000);
> > >>
> > >> while (1)
> > >> ;
> > >>}
> > >>
> > >
> > >
> > > Hallo Herbert,
> > >
> > > Mmmmh, don't you need to turn on PWM module in PCONP? Or do you let all
> > peripherials active on
> > > startup by default?
> > >
> > > But bit #3 in PWMTCR enables PWM module. Description of this bit says:
> > > "When one, PWM mode is enabled. PWM mode causes shadow registers..."
> > (2294's datasheet, p.233)
> > >
> > > After you have enabled PWM module (if bit #3 in PWMTCR is set) and set
> > up a value in a PWMMRx
> > > register you just need to set the appropriated bit in PWMLER register
> > to take effect of new PWMMRx
> > > value.
> > >
> > > You do not need using PWMLER register if you hold PWM in reset state
> > during changing PWMMRx values
> > > (see changes above).
> > >
> > > Try it!
> > > Sten
> > >
> >
> >Oooops, sorry! Do not comment PWMMCR in main(). But you can uncomment
> >PWMTCR statement instead.
> >
> > Sten
> >
> >--
> >/************************************************
> >Do you need a tiny and efficient real time
> >operating system (RTOS) with a preemtive
> >multitasking for LPC2000 or AT91SAM7?
> >
> >
> <<http://nanortos.net-attack.de/>http://nanortos.net-attack.de/>http://nanortos.net-attack.de/
> >
> >Or some open-source tools and code for LPC2000?
> >
> >
> <<http://www.net-attack.de/>http://www.net-attack.de/>http://www.net-attack.de/
> >
> >************************************************/
> >
> >
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