I have design my own custom Board. I have confirmed that all JTAG connections
are correct and have confirmed my ULink-ME is working on a STM32 development
board. I am using uVision4. Using standard Blinky project from Keil. When I
tried to connect to the CPU I get JTAG Communication Failure.
I have confirmed that all pull up and pull down resistors are correct on JTAG
..
I have assembled a second PCB only with CPU + Xtal + Jtag. Still get same error
message.
Is there anything I am missing or not doing.. Or is there anything that I can
confirm why it is not Conencting.
CPU = LPC2468FBD208
SH3718.1
ZSD0742BY
Might there be an issue with older silicon. I did try to conenct woth ISP as
well ..no go.. I have confirmed the Main Osc is not even starting up.
LPC2468 & Jtag Failure
Started by ●July 15, 2010
Reply by ●July 15, 20102010-07-15
check in JTAG schematic
http://www.sparkfun.com/datasheets/LPC/LPC-E2468-SCH-REV-A.pdf
On Thu, Jul 15, 2010 at 6:57 AM, maveric_pta wrote:
> I have design my own custom Board. I have confirmed that all JTAG
> connections are correct and have confirmed my ULink-ME is working on a STM32
> development board. I am using uVision4. Using standard Blinky project from
> Keil. When I tried to connect to the CPU I get JTAG Communication Failure.
>
> I have confirmed that all pull up and pull down resistors are correct on
> JTAG ..
>
> I have assembled a second PCB only with CPU + Xtal + Jtag. Still get same
> error message.
>
> Is there anything I am missing or not doing.. Or is there anything that I
> can confirm why it is not Conencting.
>
> CPU = LPC2468FBD208
> SH3718.1
> ZSD0742BY
>
> Might there be an issue with older silicon. I did try to conenct woth ISP
> as well ..no go.. I have confirmed the Main Osc is not even starting up.
>
>
>
--
http://www.micro4you.com -> ARM USB JTAG
http://stores.ebay.com/Micro4you-Store -> Ebay Store
http://www.friendlyarm.com -> FriendlyARM mini2440
http://www.sparkfun.com/datasheets/LPC/LPC-E2468-SCH-REV-A.pdf
On Thu, Jul 15, 2010 at 6:57 AM, maveric_pta wrote:
> I have design my own custom Board. I have confirmed that all JTAG
> connections are correct and have confirmed my ULink-ME is working on a STM32
> development board. I am using uVision4. Using standard Blinky project from
> Keil. When I tried to connect to the CPU I get JTAG Communication Failure.
>
> I have confirmed that all pull up and pull down resistors are correct on
> JTAG ..
>
> I have assembled a second PCB only with CPU + Xtal + Jtag. Still get same
> error message.
>
> Is there anything I am missing or not doing.. Or is there anything that I
> can confirm why it is not Conencting.
>
> CPU = LPC2468FBD208
> SH3718.1
> ZSD0742BY
>
> Might there be an issue with older silicon. I did try to conenct woth ISP
> as well ..no go.. I have confirmed the Main Osc is not even starting up.
>
>
>
--
http://www.micro4you.com -> ARM USB JTAG
http://stores.ebay.com/Micro4you-Store -> Ebay Store
http://www.friendlyarm.com -> FriendlyARM mini2440
Reply by ●July 15, 20102010-07-15
On Thu, Jul 15, 2010 at 1:57 AM, maveric_pta wrote:
>
> I have confirmed the Main Osc is not even starting up.
>
You have harware problem with main osc. Check caps and xtal. Check power
supply.
--
Best regards,
Mario.
>
> I have confirmed the Main Osc is not even starting up.
>
You have harware problem with main osc. Check caps and xtal. Check power
supply.
--
Best regards,
Mario.
Reply by ●July 15, 20102010-07-15
On 15/07/2010 00:57, maveric_pta wrote:
> I have design my own custom Board. I have confirmed that all JTAG connections are correct and have confirmed my ULink-ME is working on a STM32 development board. I am using uVision4. Using standard Blinky project from Keil. When I tried to connect to the CPU I get JTAG Communication Failure.
>
> I have confirmed that all pull up and pull down resistors are correct on JTAG ..
>
> I have assembled a second PCB only with CPU + Xtal + Jtag. Still get same error message.
>
> Is there anything I am missing or not doing.. Or is there anything that I can confirm why it is not Conencting.
>
> CPU = LPC2468FBD208
> SH3718.1
> ZSD0742BY
>
> Might there be an issue with older silicon. I did try to conenct woth ISP as well ..no go.. I have confirmed the Main Osc is not even starting up.
Show us the schematic. It's probably something trivial in the design.
Leon
--
Leon Heller
G1HSM
> I have design my own custom Board. I have confirmed that all JTAG connections are correct and have confirmed my ULink-ME is working on a STM32 development board. I am using uVision4. Using standard Blinky project from Keil. When I tried to connect to the CPU I get JTAG Communication Failure.
>
> I have confirmed that all pull up and pull down resistors are correct on JTAG ..
>
> I have assembled a second PCB only with CPU + Xtal + Jtag. Still get same error message.
>
> Is there anything I am missing or not doing.. Or is there anything that I can confirm why it is not Conencting.
>
> CPU = LPC2468FBD208
> SH3718.1
> ZSD0742BY
>
> Might there be an issue with older silicon. I did try to conenct woth ISP as well ..no go.. I have confirmed the Main Osc is not even starting up.
Show us the schematic. It's probably something trivial in the design.
Leon
--
Leon Heller
G1HSM
Reply by ●July 15, 20102010-07-15
Hi All ARM buddies
It seems there is no medication for human stupidity. Yes I have found the issue with the JTag failure. Circuit is 100% components are 100%. But no ARM processors will work if it has been populated incorrectly.
I have to thank production again today for making me doubt my design and just re-iterate that if you did not populate the PCB yourself. Do not believe a Prototype production PCB.
Check all devices polarity. Ha-ha
Regards and happy Coding
--- In l..., Leon Heller wrote:
>
> On 15/07/2010 00:57, maveric_pta wrote:
> > I have design my own custom Board. I have confirmed that all JTAG connections are correct and have confirmed my ULink-ME is working on a STM32 development board. I am using uVision4. Using standard Blinky project from Keil. When I tried to connect to the CPU I get JTAG Communication Failure.
> >
> > I have confirmed that all pull up and pull down resistors are correct on JTAG ..
> >
> > I have assembled a second PCB only with CPU + Xtal + Jtag. Still get same error message.
> >
> > Is there anything I am missing or not doing.. Or is there anything that I can confirm why it is not Conencting.
> >
> > CPU = LPC2468FBD208
> > SH3718.1
> > ZSD0742BY
> >
> > Might there be an issue with older silicon. I did try to conenct woth ISP as well ..no go.. I have confirmed the Main Osc is not even starting up.
> Show us the schematic. It's probably something trivial in the design.
>
> Leon
> --
> Leon Heller
> G1HSM
>
It seems there is no medication for human stupidity. Yes I have found the issue with the JTag failure. Circuit is 100% components are 100%. But no ARM processors will work if it has been populated incorrectly.
I have to thank production again today for making me doubt my design and just re-iterate that if you did not populate the PCB yourself. Do not believe a Prototype production PCB.
Check all devices polarity. Ha-ha
Regards and happy Coding
--- In l..., Leon Heller wrote:
>
> On 15/07/2010 00:57, maveric_pta wrote:
> > I have design my own custom Board. I have confirmed that all JTAG connections are correct and have confirmed my ULink-ME is working on a STM32 development board. I am using uVision4. Using standard Blinky project from Keil. When I tried to connect to the CPU I get JTAG Communication Failure.
> >
> > I have confirmed that all pull up and pull down resistors are correct on JTAG ..
> >
> > I have assembled a second PCB only with CPU + Xtal + Jtag. Still get same error message.
> >
> > Is there anything I am missing or not doing.. Or is there anything that I can confirm why it is not Conencting.
> >
> > CPU = LPC2468FBD208
> > SH3718.1
> > ZSD0742BY
> >
> > Might there be an issue with older silicon. I did try to conenct woth ISP as well ..no go.. I have confirmed the Main Osc is not even starting up.
> Show us the schematic. It's probably something trivial in the design.
>
> Leon
> --
> Leon Heller
> G1HSM
>
