Hello, Im working on a custom board with ATSAMD21E18 microcontroller and flashing it with RaspberryPi. It gives me that error when I want to flash it. What can be the problem and how can I solve this?

Open On-Chip Debugger 0.10.0+dev-00530-g9e2883b0 (2018-09-10-11:25)
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
BCM2835 GPIO config: tck = 11, tms = 25, tdi = 10, tdo = 9
BCM2835 GPIO nums: swclk = 11, swdio = 25
BCM2835 GPIO nums: swclk = 25, swdio = 24
BCM2835 GPIO config: trst = 7
BCM2835 GPIO config: srst = 18
none separate
adapter speed: 400 kHz
cortex_m reset_config sysresetreq
srst_only separate srst_gates_jtag srst_open_drain connect_deassert_srst
srst_only separate srst_nogate srst_open_drain connect_deassert_srst
adapter_nsrst_delay: 100
adapter_nsrst_assert_width: 100
Info : BCM2835 GPIO JTAG/SWD bitbang driver
Info : JTAG and SWD modes enabled
Info : clock speed 400 kHz
Info : SWD DPIDR 0x0bc11477
Info : atsamd21e18a.cpu: hardware has 4 breakpoints, 2 watchpoints
Info : Listening on port 3333 for gdb connections
    TargetName         Type       Endian TapName            State
--  ------------------ ---------- ------ ------------------ ------------
0* atsamd21e18a.cpu   cortex_m   little atsamd21e18a.cpu   halted
target halted due to debug-request, current mode: Handler HardFault
xPSR: 0xd1000003 pc: 0xfffffffe msp: 0xffffffd8
    TargetName         Type       Endian TapName            State
--  ------------------ ---------- ------ ------------------ ------------
0* atsamd21e18a.cpu   cortex_m   little atsamd21e18a.cpu   halted
target halted due to debug-request, current mode: Handler HardFault
xPSR: 0xd1000003 pc: 0xfffffffe msp: 0xffffffd8
target halted due to debug-request, current mode: Handler HardFault
xPSR: 0xd1000003 pc: 0xfffffffe msp: 0xffffffd8
** Programming Started **
auto erase enabled
Info : SAMD MCU: SAMD21E18A (256KB Flash, 32KB RAM)
wrote 8192 bytes from file trinket.bin in 0.300111s (26.657 KiB/s)
** Programming Finished **
** Verify Started **
verified 8192 bytes in 0.674242s (11.865 KiB/s)
** Verified OK **
target halted due to breakpoint, current mode: Handler HardFault
xPSR: 0x61000003 pc: 0x2000002e msp: 0xffffffd8
shutdown command invoked
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections

 

Hello, Im working on a custom board with ATSAMD21E18 microcontroller and flashing it with RaspberryPi. It gives me that error when I want to flash it. What can be the problem and how can I solve this?

What error? It seems to have programmed/verified OK.

 

What error? It seems to have programmed/verified OK.

Shouldnt "current mode" be "Thread" instead of Handler HardFault?

 

Shouldnt "current mode" be "Thread" instead of Handler HardFault?

Perhaps so, I haven't looked closely at many of these traces, since I'm mostly interested in what my host side is telling me.

Do you know why your program would Fault? What happens if you Reset it?

 

Perhaps so, I haven't looked closely at many of these traces, since I'm mostly interested in what my host side is telling me.

Do you know why your program would Fault? What happens if you Reset it?

It happens again when I reset the microcontroller and try to re-program it again.

 

It happens again when I reset the microcontroller and try to re-program it again.

Do you have a GDB client? I would start by connecting it to OpenOCD's GDB server and seeing what the actual symptom is.

The PC that points into RAM looks a bit odd, but that may not mean anything, since it only appeared once.