First steps with openocd and efm32 with STM32F4Discovery and Olimex EM-32G880F128-STK

You find an example with Emblocks or you could flash your device in a terminal.

Discussion: http://www.emblocks.org/forum/viewtopic.php?f=24&t=438 http://community.silabs.com/t5/32-Bit-Discussion/Program-Debug-EFM32-over-OpenOCD-with-an-ST-Link-V2/m-p/124380 https://www.olimex.com/forum/index.php?topic=771.0

Bug in openocd-0.8.0

I tested this with the EM-32G880F128-STK Board and STM32F4Discovery Board. I modified the file /openocd-0.8.0/scripts/target/efm32_stlink.cfg -delete last line cortex_m reset_config sysresetreq because I alway get an error about "cortex_m" http://sourceforge.net/p/openocd/mailman/message/32463675/

To connect with the ST-LINK/V2 and the EFM32 open openocd in a terminal with the following command:

Linux: "openocd -f interface/stlink-v2.cfg -f target/efm32_stlink.cfg"

Windows x64 (in directory openocd-0.8.8/bin-x64): "openocd-x64-0.8.0.exe -f interface/stlink-v2.cfg -f target/efm32_stlink.cfg"

Windows (in directory openocd-0.8.8/bin): "openocd-0.8.0.exe -f interface/stlink-v2.cfg -f target/efm32_stlink.cfg"

To erase and flash your device: Linux: open a second terminal

"telnet localhost 4444" "reset halt" "flash write_image erase ../../bin/Debug/Basic_Example_EFM32G880F128-STK_EmBlocks.elf" "reset" now your device should run

Windows: the same, but you have to do this with putty (insted of a second terminal)

Useful commands: //Reset device "reset"

//halt device "halt"

//actual events "efm32.cpu eventlist"

//reset and halt device "reset halt"

//list all availlable flash (device must be in halt state) flash list "flash probe 0"

//erase sectors 0-255 (device must be in halt state) "flash erase_sector 0 0 255"

//check if bank 0 is erased (device must be in halt state) "flash erase_check 0"

Useful Links:

EFM32 Openocd: http://sourceforge.net/p/openocd/mailman/openocd-user/thread/5330AF5C.2000005@op.pl/

http://techwithdave.blogspot.ch/2013_07_01_archive.html

http://www.triplespark.net/elec/pdev/arm/stm32.html

Openocd install: http://gnuarmeclipse.livius.net/blog/openocd-install/