I am using Eclipse Kelpler SD2 and GNU ARM 4.7 tool chain, plus GNU ARM Eclipse Plugin
and after download code into CM0 I got the warning
"The connected emulator does not support serial wire output (SWO)
My setup environment
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Eclipse IDE for C/C++ Developers Version: Kepler Service Release 2
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GNU ARM tool chain 4.7
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GNU ARM Eclipse plug-in
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J-link V4.90d
=============== J-Link GDB Server Log ========================
SEGGER J-Link GDB Server V4.90d GUI Version
JLinkARM.dll V4.90d (DLL compiled Aug 29 2014 14:49:16)
-----GDB Server start settings-----
GDBInit file: none
GDB Server Listening port: 2331
SWO raw output listening port: 2332
Terminal I/O port: 2333
Accept remote connection: localhost only
Generate logfile: off
Verify download: off
Init regs on start: on
Silent mode: off
Single run mode: off
Target connection timeout: 5 sec.
------J-Link related settings------
J-Link Host interface: USB
J-Link script: none
J-Link settings file: none
------Target related settings------
Target device: nRF51822_xxAA
Target interface: SWD
Target interface speed: 1000kHz
Target endian: little
Connecting to J-Link...
J-Link is connected.
Firmware: J-Link OB-SAM3U128 V1 compiled Aug 22 2014 17:25:44
Hardware: V1.00
S/N: 480209778
Checking target voltage...
Target voltage: 3.30 V
Listening on TCP/IP port 2331
Connecting to target...Connected to target
Waiting for GDB connection...Connected to 127.0.0.1
Reading all registers
Read 4 bytes @ address 0x00000000 (Data = 0x00000708)
Target interface speed set to 1000 kHz
Resetting target
Halting target CPU...
...Target halted (PC = 0x00000630)
R0 = FFFFFFFF, R1 = FFFFFFFF, R2 = FFFFFFFF, R3 = FFFFFFFF
R4 = FFFFFFFF, R5 = FFFFFFFF, R6 = FFFFFFFF, R7 = FFFFFFFF
R8 = FFFFFFFF, R9 = FFFFFFFF, R10= FFFFFFFF, R11= FFFFFFFF
R12= FFFFFFFF, R13= 00000708, MSP= 00000708, PSP= FFFFFFFC
R14(LR) = FFFFFFFF, R15(PC) = 00000630
XPSR C1000000, APSR C0000000, EPSR 01000000, IPSR 00000000
CFBP 00000000, CONTROL 00, FAULTMASK 00, BASEPRI 00, PRIMASK 00
Reading all registers
Select auto target interface speed (2000 kHz)
Flash breakpoints enabled
Semi-hosting enabled (VectorAddr = 0x08)
Semihosting I/O set to TELNET Client
SWO disabled succesfully.
GDB closed TCP/IP connection
====================================
If I ignore the warning and dismiss the dialog, program can run but could not stop at any breakpoint
