JTAG Implementation through software

Started by appu in comp.arch.embedded9 years ago 5 replies

Hi All, I have to convert Intel Hex Code into JTAG bits so that I can directly provide the output (JTAG Bits) to the JTAG I/F. I can use...

Hi All, I have to convert Intel Hex Code into JTAG bits so that I can directly provide the output (JTAG Bits) to the JTAG I/F. I can use JTAG for this. So can please let me know hoe to do Intel Hex conversion into JTAG bits. Any kind of example, documents and flow diagram will be highly appreciated. Thanks, Appu


Code runs slower on JTAG

Started by wrongmove in comp.arch.embedded12 years ago 4 replies

Hi, it appears funny but interesting. I am debugging a problem and for which I am using TRACE32 JTAG interface on ARM platform. But when I...

Hi, it appears funny but interesting. I am debugging a problem and for which I am using TRACE32 JTAG interface on ARM platform. But when I try to run system without attaching JTAG it crashing where as at the same time once i mount it on JTAG it runs smoothly I observed that JTAG introduces some delay so i introduced some delays at specific locations but still it is same ... Anybody ca...


JTAG and flash

Started by Alice in comp.arch.embedded12 years ago 19 replies

I'm new to learning about jtag and it's capabilities, and my professor isn't helping me at all. I understand jtag is mainly used in processors,...

I'm new to learning about jtag and it's capabilities, and my professor isn't helping me at all. I understand jtag is mainly used in processors, but I was reading on Altera's website about a flash chip (EPM3032A) they use that has jtag support. What jtag device would I need to communicate with a flash chip like that? I understand there are jtag devices that support many versions of arm, mip...


JTAG TAP

Started by Paul Taylor in comp.arch.embedded13 years ago 5 replies

Hi, I am writing a bit of software to control a JTAG port, but I am having a bit of trouble getting it working. Below are the steps my...

Hi, I am writing a bit of software to control a JTAG port, but I am having a bit of trouble getting it working. Below are the steps my software is following to test out a JTAG connection. I think that there must be an error in there somewhere, but from my understanding of the JTAG TAP and the way JTAG works, I can't see a problem at the moment. Can anyone comment on whether I am cont...


AVR JTAG programmer choice

Started by Roger in comp.arch.embedded12 years ago 16 replies

My JTAG Cable1 has just failed and I need to get another JTAG programmer, ideally with a USB interface although if it has to be serial so be it....

My JTAG Cable1 has just failed and I need to get another JTAG programmer, ideally with a USB interface although if it has to be serial so be it. Obviously I'd get an Atmel JTAG ICE Mk11 if the cost wasn't so ridiculously high so it'll have to be an alternative. What are people's views on the best one available at the moment? Thanks. Roger.


MSP430 and Atmel AVR in one JTAG chain?

Started by Grant Edwards in comp.arch.embedded10 years ago 13 replies

Does anybody know if either the MSP430 or Atmel ATmega AVR parts (or associated JTAG interface widgets/SW) have problems when there are other...

Does anybody know if either the MSP430 or Atmel ATmega AVR parts (or associated JTAG interface widgets/SW) have problems when there are other devices in the JTAG chain? In the past, I've run into buggy JTAG stuff that couldn't tolerate having multiple devices in the JTAG chain. I'm working on a design with both an AVR and an MSP430, and I'd like to have a single JTAG header/chain. Before...


JTAG question

Started by Sagaert Johan in comp.arch.embedded12 years ago 4 replies

I have a jtag programmer for xilinx devices ,is this a standard interface ? Can i use this device to program other devices with a JTAG interface...

I have a jtag programmer for xilinx devices ,is this a standard interface ? Can i use this device to program other devices with a JTAG interface (eg ARM ) ? Or do i need a dedicated tjag interface for every Jtag device i intend to use ? (whats the use of a JTAG standard then ?) Johan


Identify JTAG pins

Started by Gregory Dudek in comp.arch.embedded12 years ago 1 reply

I have a microprocess device I would like to patch. It has some headers and I know one of them is JTAG, but I can't figure out which nor which...

I have a microprocess device I would like to patch. It has some headers and I know one of them is JTAG, but I can't figure out which nor which pins have which JTAG lines (TRST, etc). Does anybody have some suggestions re. how to identify the JTAG pins, perhaps using a scope and a multimeter?


JTAG implementation

Started by Giovanni in comp.arch.embedded14 years ago 1 reply

Hello everybody. I'm interested in developing a JTAG system using a FPGA programmed in VHDL. Is there some good source on line that can help me...

Hello everybody. I'm interested in developing a JTAG system using a FPGA programmed in VHDL. Is there some good source on line that can help me in doing that? Where can I found the specification of JTAG standard? Are they free available?


Jtag clocks

Started by linnix in comp.arch.embedded11 years ago 12 replies

I am having problem jtag an ARM Cortex M3 at more than 1/256 of the system clock (6Mz). If I clock it any faster, the chip reports data overrun...

I am having problem jtag an ARM Cortex M3 at more than 1/256 of the system clock (6Mz). If I clock it any faster, the chip reports data overrun error. Is there any solution to speed it up? I can jtag an AVR at full speed, so I don't think it's a jtag problem.


JTAG - Boundary Scan s/w using Byteblaster or Parallel 4 cable

Started by Fred in comp.arch.embedded11 years ago 6 replies

Does anyone know of any software, ideally freeware, which can use the above JTAG interfaces to exercise other JTAG interfaces on non FPGA...

Does anyone know of any software, ideally freeware, which can use the above JTAG interfaces to exercise other JTAG interfaces on non FPGA devices? In my case I'd like to read the state of pins on an unrelated device.


JTAG multiple devices

Started by amerdsp in comp.arch.embedded10 years ago 8 replies

Greetings, I am new to JTAG and and I am working on a project that that has an Atmel AVR. I want to be able to use JTAG but have not bought...

Greetings, I am new to JTAG and and I am working on a project that that has an Atmel AVR. I want to be able to use JTAG but have not bought any programming/debugging devices yet. I would like to get something that is compatible with other products that I see myself using in the future such as FPGAs or other microcontroller families. I am on a tight budget and I want to get something tha...


need JTAG debugger - please help

Started by Adam in comp.arch.embedded8 years ago 8 replies

We need a JTAG debugger for board bring-up. Are JTAG debuggers available for rent? Any recommendations/suggestions?

We need a JTAG debugger for board bring-up. Are JTAG debuggers available for rent? Any recommendations/suggestions?


ARM922t:- Invalid CPU Mode

Started by raajesh.n in comp.arch.embedded10 years ago

Hi, I am working on ARM 922t, when I am trying to debug a small code say "hello world", I am getting Invalid CPU Mode debugger error upon...

Hi, I am working on ARM 922t, when I am trying to debug a small code say "hello world", I am getting Invalid CPU Mode debugger error upon doing single step debugging , I am using H-JTAG RDI interface. I have few Queries too.., (a) The customized board which I am using says to use MULTI ICE JTAG , but I am using winggler JTAG interface with H-JTAG RDI server!, can this create a problem? ...


MSP430 JTAG

Started by el_777 in comp.arch.embedded12 years ago 6 replies

Hi everybody. I am working with a development platform based in the msp430, and I am looking for different programming tools. I tried the JTAG but...

Hi everybody. I am working with a development platform based in the msp430, and I am looking for different programming tools. I tried the JTAG but this is too big. it takes up to 14 pins of space. So I hope that somebody can make a suggestion about other solutions, or other version of JTAG that take up less space.


MSP430 JTAG

Started by el_777 in comp.arch.embedded12 years ago 4 replies

Hi everybody. I am working with a development platform based in the msp430, and I am looking for different programming tools. I tried the JTAG but...

Hi everybody. I am working with a development platform based in the msp430, and I am looking for different programming tools. I tried the JTAG but this is too big. it takes up to 14 pins of space. So I hope that somebody can make a suggestion about other solutions, or other version of JTAG that take up less space.


problem with jtag/ETM on Philips LPC21xx

Started by Maciej Kaczkowski in comp.arch.embedded13 years ago 4 replies

How can I use JTAG mode without ETM port on Philips LPC 210x? I pull up DBGSEL and RTCK during RESET, processor starts using jtag but also...

How can I use JTAG mode without ETM port on Philips LPC 210x? I pull up DBGSEL and RTCK during RESET, processor starts using jtag but also ETM port is enabled (I can`t use ETM pins as GPIO). I am also using LPC 212x - it is posible to turn on jtag without ETM port. Thank You


Gawd I love ARM JTAG

Started by Tim Wescott in comp.arch.embedded6 years ago 9 replies

TI/Luminary LM3S8971. Went to do some upgrades in my startup code, in the function called -- ironically enough -- "escape_hatch", which is...

TI/Luminary LM3S8971. Went to do some upgrades in my startup code, in the function called -- ironically enough -- "escape_hatch", which is the VERY FIRST THING that gets run. It spins on a pressed button so if something downstream like PLL setup or I/O port stuff messes up JTAG, I can still get in with the JTAG debugger and figure out what's happening and program flash and whatnot. ...


Luminary JTAG disabled by optimizations? WTF??

Started by Tim Wescott in comp.arch.embedded6 years ago 25 replies

I just replaced the "-O0" in my makefile with "-O3", and as soon as the code ran the JTAG debugger stopped working -- it reports "all ones" on...

I just replaced the "-O0" in my makefile with "-O3", and as soon as the code ran the JTAG debugger stopped working -- it reports "all ones" on the JTAG chain when it tries to connect. Gnu tool chain. Has anyone had this happen? Any clues on how to get functionality back? I suspect that I just need to replace the chip -- but that's a pain in the backside, and I don't want to do it ...


LPC2106 JTAG Programming Confusion!!

Started by amerdsp in comp.arch.embedded10 years ago 1 reply

Greetings, I am reading mixed information about the ability to program the 2106 using a parallel port wiggler. Some say that it is only...

Greetings, I am reading mixed information about the ability to program the 2106 using a parallel port wiggler. Some say that it is only possible to program the device via RS232 but others say that it is possible to do the JTAG programming. What am I missing? What do I need to have to be able to use JTAG for programming the chip if possible? Thank you, -- A