OpenOCD V0.8.0, mbed LPC1768, cmsis-dap - problems

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fordprefect
Posts: 1
Joined: Thu Aug 28, 2014 10:14 am

OpenOCD V0.8.0, mbed LPC1768, cmsis-dap - problems

Post by fordprefect » Thu Aug 28, 2014 10:30 am

Hi Everyone,

I am trying to get OpenOCD up and running correctly with an mbed LPC1768. The setup/versions I am running is:
  • OS X 10.9.4;
    GNU ARM GCC 8.4 2014 Q2 from launchpad;
    mbed LPC1768 with firmware version 141212;
    OpenOCD V0.8.0 installed via homebrew;
I am using the simplest possible code, it just blinks one of the built in led's on the mbed lpc1768 every 100ms, I have exported this from the mbed online compiler, compiled with my local GCC and put the bin on to the mbed in the normal way. This works without issue.

I then start OpenOCD with the default mbed-lpc1768.cfg config file, this finds the board without problem.

I launch gdb, halt the mbed, load the code and when I attempt to start the code it does not function as expected, gdb output below:

Code: Select all

stevembp:HelloWorld steve$ arm-none-eabi-gdb HelloWorld.elf 
GNU gdb (GNU Tools for ARM Embedded Processors) 7.6.0.20140529-cvs
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=x86_64-apple-darwin10 --target=arm-none-eabi".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /Users/steve/Documents/Development/HelloWorld/HelloWorld.elf...done.
(gdb) 
(gdb) 
(gdb) target remote localhost:3333
Remote debugging using localhost:3333
0x00000000 in __isr_vector ()
(gdb) mon reset halt
target state: halted
target halted due to debug-request, current mode: Thread 
xPSR: 0x01000000 pc: 0x1fff0080 msp: 0x10001ffc
(gdb) load
Loading section .text, size 0x6f9c lma 0x0
Loading section .ARM.exidx, size 0x8 lma 0x6f9c
Loading section .data, size 0xb4 lma 0x6fa4
Start address 0x308, load size 28760
Transfer rate: 67 bytes/sec, 7190 bytes/write.
(gdb) continue
Continuing.
lpc1768.cpu -- clearing lockup after double fault
 
Program received signal SIGINT, Interrupt.
0x00000000 in __isr_vector ()
The output from the OpenOCD session is:

Code: Select all

stevembp:Development steve$ openocd -f /usr/local/share/openocd/scripts/board/mbed-lpc1768.cfg 
Open On-Chip Debugger 0.8.0 (2014-08-27-15:37)
Licensed under GNU GPL v2
For bug reports, read
    http://openocd.sourceforge.net/doc/doxygen/bugs.html
Info : only one transport option; autoselect 'cmsis-dap'
Info : CMSIS-DAP: SWD  Supported
Info : CMSIS-DAP: Interface Initialised (SWD)
adapter speed: 10 kHz
adapter_nsrst_delay: 200
cortex_m reset_config sysresetreq
Info : CMSIS-DAP: FW Version = 1.0
Info : SWCLK/TCK = 0 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1
Info : DAP_SWJ Sequence (reset: 50+ '1' followed by 0)
Info : CMSIS-DAP: Interface ready
Info : clock speed 10 kHz
Info : IDCODE 0x2ba01477
Info : lpc1768.cpu: hardware has 6 breakpoints, 4 watchpoints
Info : accepting 'gdb' connection from 3333
undefined debug reason 7 - target needs reset
target state: halted
target halted due to debug-request, current mode: Thread 
xPSR: 0x01000000 pc: 0x1fff0080 msp: 0x10001ffc
Warn : negative acknowledgment, but no packet pending
Warn : negative acknowledgment, but no packet pending
Warn : keep_alive() was not invoked in the 1000ms timelimit. GDB alive packet not sent! (1001). Workaround: increase "set remotetimeout" in GDB
Warn : keep_alive() was not invoked in the 1000ms timelimit. GDB alive packet not sent! (1027). Workaround: increase "set remotetimeout" in GDB
target state: halted
target halted due to debug-request, current mode: Thread 
xPSR: 0x01000000 pc: 0x1fff0080 msp: 0x10001ffc
Warn : keep_alive() was not invoked in the 1000ms timelimit. GDB alive packet not sent! (5069). Workaround: increase "set remotetimeout" in GDB
Warn : Verification will fail since checksum in image (0x00000000) to be written to flash is different from calculated vector checksum (0xefff6cc6).
Warn : To remove this warning modify build tools on developer PC to inject correct LPC vector checksum.
Warn : keep_alive() was not invoked in the 1000ms timelimit. GDB alive packet not sent! (401105). Workaround: increase "set remotetimeout" in GDB
Warn : keep_alive() was not invoked in the 1000ms timelimit. GDB alive packet not sent! (1158). Workaround: increase "set remotetimeout" in GDB
target state: halted
target halted due to debug-request, current mode: Thread 
xPSR: 0x01000000 pc: 0x1fff0080 msp: 0x10001ffc
Warn : keep_alive() was not invoked in the 1000ms timelimit. GDB alive packet not sent! (5029). Workaround: increase "set remotetimeout" in GDB
Error: lpc1768.cpu -- clearing lockup after double fault
Polling target lpc1768.cpu failed, GDB will be halted. Polling again in 100ms
Polling target lpc1768.cpu succeeded again
The actual code that is being compiled and flashed is below:

Code: Select all

#include "mbed.h"
 
DigitalOut myled(LED1);
 
int main() {
    myled = 0;
    while(1) {
        myled = !myled;
        wait(0.1);
    }
}
I do not believe this is an issue with the code, the way that I am compiling it or the mbed as when I use pyOCD the same elf binary works as expected and I can step through the code.

I have also tried this using the current OpenOCD development stream (also installed via homebrew) and I get exactly the same output.

Any help would be gratefully received.

Kind Regards,

Steve

hsutherl
Posts: 182
Joined: Sun Jun 07, 2009 6:24 am

Re: OpenOCD V0.8.0, mbed LPC1768, cmsis-dap - problems

Post by hsutherl » Tue Sep 02, 2014 6:14 pm

Hi Steve,

That program counter just after the mon reset halt looks like trouble. I have an LPC1768 board that I've pretty much set aside after endless frustration trying to get openOCD and/or GDB to sync up after reset. The fact that the bootloader always runs complicates things. IMO if you're using NXP parts it might be worth the $$ for one of the commercial development tools. If you search the forums you'll find a number of recommendations, all of whom apparently have solved that problem.

Some things I've done to get ST parts to sync up using openOCD:
  • issue reset halt via telnet session to openocd before connecting with gdb
  • load the code via telnet session before connecting with gdb
  • try mon gdb_sync from GDB
With NXP parts:
  • at times I've seemed to have intermittent success adding a delay of a few msec in crt0.s to allow openocd to get control
  • To do the above you have to get the code into the device. I've sometimes fallen back on the serial port bootloader (the one I've been maligning) for that. Of course that only works if your board supports it.
I know it has to be simpler than I make it sound or NXP would not be so popular...

-Hugh

Yoko
Posts: 16
Joined: Tue Feb 10, 2015 9:22 pm

Re: OpenOCD V0.8.0, mbed LPC1768, cmsis-dap - problems

Post by Yoko » Tue Feb 10, 2015 9:51 pm

Try to add these lines to the cfg file

reset_config trst_and_srst
adapter_nsrst_delay 20

lpc17xx.cpu configure -event gdb-attach {
reset halt
}

lpc17xx.cpu configure -event gdb-detach {
resume
}

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