I now tried to reduce error sources and took this example from Jeremy Ellis as a minimal RPC call example:
RPC Example
After 4 hours of running, the same issue occured. Serial Port Error messege from Pin 14/15 (Baudrate 115200)
++ MbedOS Fault Handler ++
FaultType: HardFault
Context:
R0 : 2401F7E8
R1 : 00000040
R2 : 00000008
R3 : 00000004
R4 : 240015F8
R5 : 3E917261
R6 : 00000000
R7 : 2401F75C
R8 : 00000000
R9 : 080671D4
R10 : 00000004
R11 : FFFFFFD0
R12 : 0805187D
SP : 24025788
LR : 08041AAD
PC : 08041848
xPSR : 21000000
PSP : 24025768
MSP : 2407FF78
CPUID: 411FC271
HFSR : 40000000
MMFSR: 00000000
BFSR : 00000004
UFSR : 00000000
DFSR : 00000000
AFSR : 00000000
Mode : Thread
Priv : Privileged
Stack: PSP
-- MbedOS Fault Handler --++ MbedOS Error Info ++
Error Status: 0x80FF013D Code: 317 Module: 255
Error Message: Fault exception
Location: 0x8041848
Error Value: 0x24006938
Current Thread: application_unnamed_thread Id: 0x24024898 Entry:
0x8051C59 StackSize: 0x1000 StackMem: 0x240248E8 SP: 0x24025788 For
more info, visit:
mbedos-error
-- MbedOS Error Info --
Maybe anyone can now reproduce the error.
Best regards
Michael