RAM loading via JTAG
2005-08-17 by Piotr Zbysinski
I plan to build Flash programmer (via JTAG) for LPC2K. Is there anybody who knows JTAG command codes used for SRAM loading? Rgs Piotr
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RAM loading via JTAG
Re: [lpc2000] RAM loading via JTAG
2005-08-17 by Richard Duits
When you switch the ARM7 into debug mode, all instructions and data are read from the jtag interface. You can just upload a ldm instruction for example with the data following the instruction and then use a stm instruction to store it in sram. Then you setup the registers to call the IAP routine and set a breakpoint to the same address the LR is pointing to. The ARM site has excelent documentation on this, so I suggest you browse www.arm.com and lookup the information you need. A suggestion: use a FT2232 (see http://www.ftdichip.com/FTProducts.htm#FT2232C) for the low level JTAG stuff, they have a JTAG DLL for windows and good documentation the write this yourself for other platforms. All you need is this single FT2232 and some passive components to make this work. Richard Duits Piotr Zbysinski wrote:
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> I plan to build Flash programmer (via JTAG) for LPC2K. Is there > anybody who knows JTAG command codes used for SRAM loading? > Rgs > Piotr > > > > > SPONSORED LINKS > Microcontrollers > <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=8085+microprocessor&c=5&s=120&.sig=OPqm0ilH6VyGn-geZ0nNwA> > Microprocessor > <http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=8085+microprocessor&c=5&s=120&.sig=e6n93hF7rArBsrPQJltQ_w> > Intel microprocessors > <http://groups.yahoo.com/gads?t=ms&k=Intel+microprocessors&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=8085+microprocessor&c=5&s=120&.sig=EENrTtKaQUw-Vd0BgTdDmw> > > Pic microcontrollers > <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=8085+microprocessor&c=5&s=120&.sig=iYT6za1gT3-VT1hwIylDpw> > 8085 microprocessor > <http://groups.yahoo.com/gads?t=ms&k=8085+microprocessor&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=8085+microprocessor&c=5&s=120&.sig=PhYMBsCkQptYbazQFyNujQ> > > > > ------------------------------------------------------------------------ > YAHOO! GROUPS LINKS > > * Visit your group "lpc2000 > <http://groups.yahoo.com/group/lpc2000>" on the web. > > * To unsubscribe from this group, send an email to: > lpc2000-unsubscribe@yahoogroups.com > <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service <http://docs.yahoo.com/info/terms/>. > > > ------------------------------------------------------------------------ >
Re: [lpc2000] RAM loading via JTAG
2005-08-18 by Piotr Zbysinski - EP(H)
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From: Richard Duits To: lpc2000@yahoogroups.com Sent: Thursday, August 18, 2005 1:15 AM Subject: Re: [lpc2000] RAM loading via JTAG When you switch the ARM7 into debug mode, all instructions and data are read from the jtag interface. You can just upload a ldm instruction for example with the data following the instruction and then use a stm instruction to store it in sram. ** Do you mean: should I send via JTAG binary code of LDM/STM instructions? Then you setup the registers to call the IAP routine and set a breakpoint to the same address the LR is pointing to. The ARM site has excelent documentation on this, so I suggest you browse www.arm.com and lookup the information you need. ** OK, I'll try. A suggestion: use a FT2232 (see http://www.ftdichip.com/FTProducts.htm#FT2232C) for the low level JTAG stuff, they have a JTAG DLL for windows and good documentation the write this yourself for other platforms. All you need is this single FT2232 and some passive components to make this work. ** JTAG is not a problem for me (I used FT2232 in universal PLD programmer/configurator IEEE1532 compatible). My idea is to prepare Windows software for simple Macraigor interface for fast programming LPC uCs. Thanks for answer. Piotr [Non-text portions of this message have been removed]