I designed a custom K24 board which is fairly simple:
- J-Link Segger header
- All pins broken out
- Power routed
- Decoupling caps
- Optional pullups for reset and SWD data, optional pulldown for SWD clock
https://oshpark.com/shared_projects/IVFTmKsz
Using 200 Khz SWD speed, have EZP_CS_b pulled high. Tried at 1.8 and 3.3v both.
I have populated:
SWD data pullup: 4k7
Reset pullup:4k7
Clock pulldown: 4k7
Clock capacitor to gnd: 560pf
In the middle of the launch process, it fails back to a reset loop.
Channel 0: Reset
Channel 1: Data
Channel 2: Clock
Full view:
Zoomed in on where it starts the reset loop again:
The 'Trailing bits' section is where the reset loop starts:
Zoomed out a bit around the area where the reset loop starts:
I assembled a second board which exhibited the same failure. What is going wrong?
Dump from J-Link
SEGGER J-Link GDB Server V5.10n Command Line Version
JLinkARM.dll V5.10n (DLL compiled Feb 19 2016 18:41:43)
-----GDB Server start settings-----
GDBInit file: none
GDB Server Listening port: 2331
SWO raw output listening port: 2332
Terminal I/O port: 2332
Accept remote connection: localhost only
Generate logfile: off
Verify download: on
Init regs on start: on
Silent mode: off
Single run mode: on
Target connection timeout: 0 ms
------J-Link related settings------
J-Link Host interface: USB
J-Link script: none
J-Link settings file: none
------Target related settings------
Target device: MK24FN1M0xxx12
Target interface: SWD
Target interface speed: 200kHz
Target endian: little
Connecting to J-Link...
J-Link is connected.
Firmware: J-Link V9 compiled Apr 22 2016 11:47:06
Hardware: V9.30
S/N: 59306698
Feature(s): GDB
Checking target voltage...
Target voltage: 1.77 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 = 0xFFFFFFFF)
Target interface speed set to 200 kHz
Resetting target
Halting target CPU...
...Target halted (PC = 0xFFFFFFFE)
R0 = 00000000, R1 = 00000000, R2 = 00000000, R3 = 00000000
R4 = 00000000, R5 = 00000000, R6 = 00000000, R7 = 00000000
R8 = 00000000, R9 = 00000000, R10= 00000000, R11= 00000000
R12= 00000000, R13= FFFFFFFC, MSP= FFFFFFFC, PSP= 00000000
R14(LR) = FFFFFFFF, R15(PC) = FFFFFFFE
XPSR 01000000, APSR 00000000, EPSR 01000000, IPSR 00000000
CFBP 00000000, CONTROL 00, FAULTMASK 00, BASEPRI 00, PRIMASK 00
Reading all registers
Target interface speed set to 200 kHz
Flash breakpoints enabled
Semi-hosting enabled (Handle on BKPT)
Semihosting I/O set to TELNET Client
Downloading 16 bytes @ address 0x00000400 - Verified OK
Downloading 1024 bytes @ address 0x1FFF0000Comparing flash [....................] Done.
Verifying flash [....................] Done.
- Verified OK
Downloading 16112 bytes @ address 0x1FFF0400 - Verified OK
Downloading 16144 bytes @ address 0x1FFF42F0 - Verified OK
Downloading 1000 bytes @ address 0x1FFF8200 - Verified OK
Downloading 8 bytes @ address 0x1FFF85E8 - Verified OK
Downloading 4 bytes @ address 0x1FFF85F0 - Verified OK
Downloading 4 bytes @ address 0x1FFF85F4 - Verified OK
Downloading 116 bytes @ address 0x1FFF85F8 - Verified OK
Writing register (PC = 0x1fff04c8)
Read 4 bytes @ address 0x1FFF04C8 (Data = 0x4809B672)
Read 2 bytes @ address 0x1FFF2452 (Data = 0xF004)
Read 2 bytes @ address 0x1FFF2452 (Data = 0xF004)
Resetting target
Halting target CPU...
...Target halted (PC = 0xFFFFFFFE)
Read 2 bytes @ address 0x1FFF2452 (Data = 0xF004)
Read 2 bytes @ address 0x1FFF2452 (Data = 0xF004)
Read 2 bytes @ address 0x1FFF2452 (Data = 0xF004)
R0 = 00000000, R1 = 00000000, R2 = 00000000, R3 = 00000000
R4 = 00000000, R5 = 00000000, R6 = 00000000, R7 = 00000000
R8 = 00000000, R9 = 00000000, R10= 00000000, R11= 00000000
R12= 00000000, R13= FFFFFFFC, MSP= FFFFFFFC, PSP= 00000000
R14(LR) = FFFFFFFF, R15(PC) = FFFFFFFE
XPSR 01000000, APSR 00000000, EPSR 01000000, IPSR 00000000
CFBP 00000000, CONTROL 00, FAULTMASK 00, BASEPRI 00, PRIMASK 00
Reading all registers
WARNING: Failed to read memory @ address 0xFFFFFFFE
Setting breakpoint @ address 0x1FFF2452, Size = 2, BPHandle = 0x0001
Starting target CPU...
ERROR: Can not read register 15 (R15) while CPU is running
...Target halted (PC = 0x00000000)
Reading all registers
ERROR: Can not read register 0 (R0) while CPU is running
ERROR: Can not read register 1 (R1) while CPU is running
ERROR: Can not read register 2 (R2) while CPU is running
ERROR: Can not read register 3 (R3) while CPU is running
ERROR: Can not read register 4 (R4) while CPU is running
ERROR: Can not read register 5 (R5) while CPU is running
ERROR: Can not read register 6 (R6) while CPU is running
ERROR: Can not read register 7 (R7) while CPU is running
ERROR: Can not read register 8 (R8) while CPU is running
ERROR: Can not read register 9 (R9) while CPU is running
ERROR: Can not read register 10 (R10) while CPU is running
ERROR: Can not read register 11 (R11) while CPU is running
ERROR: Can not read register 12 (R12) while CPU is running
ERROR: Can not read register 13 (R13) while CPU is running
ERROR: Can not read register 14 (R14) while CPU is running
ERROR: Can not read register 15 (R15) while CPU is running
ERROR: Can not read register 16 (XPSR) while CPU is running
ERROR: Can not read register 17 (MSP) while CPU is running
ERROR: Can not read register 18 (PSP) while CPU is running
ERROR: Can not read register 24 (PRIMASK) while CPU is running
ERROR: Can not read register 25 (BASEPRI) while CPU is running
ERROR: Can not read register 26 (FAULTMASK) while CPU is running
ERROR: Can not read register 27 (CONTROL) while CPU is running
ERROR: Can not read register 32 (FPSCR) while CPU is running
ERROR: Can not read register 33 (FPS0) while CPU is running
ERROR: Can not read register 34 (FPS1) while CPU is running
ERROR: Can not read register 35 (FPS2) while CPU is running
ERROR: Can not read register 36 (FPS3) while CPU is running
ERROR: Can not read register 37 (FPS4) while CPU is running
ERROR: Can not read register 38 (FPS5) while CPU is running
ERROR: Can not read register 39 (FPS6) while CPU is running
ERROR: Can not read register 40 (FPS7) while CPU is running
ERROR: Can not read register 41 (FPS8) while CPU is running
ERROR: Can not read register 42 (FPS9) while CPU is running
ERROR: Can not read register 43 (FPS10) while CPU is running
ERROR: Can not read register 44 (FPS11) while CPU is running
ERROR: Can not read register 45 (FPS12) while CPU is running
ERROR: Can not read register 46 (FPS13) while CPU is running
ERROR: Can not read register 47 (FPS14) while CPU is running
ERROR: Can not read register 48 (FPS15) while CPU is running
ERROR: Can not read register 49 (FPS16) while CPU is running
ERROR: Can not read register 50 (FPS17) while CPU is running
ERROR: Can not read register 51 (FPS18) while CPU is running
ERROR: Can not read register 52 (FPS19) while CPU is running
ERROR: Can not read register 53 (FPS20) while CPU is running
ERROR: Can not read register 54 (FPS21) while CPU is running
ERROR: Can not read register 55 (FPS22) while CPU is running
ERROR: Can not read register 56 (FPS23) while CPU is running
ERROR: Can not read register 57 (FPS24) while CPU is running
ERROR: Can not read register 58 (FPS25) while CPU is running
ERROR: Can not read register 59 (FPS26) while CPU is running
ERROR: Can not read register 60 (FPS27) while CPU is running
ERROR: Can not read register 61 (FPS28) while CPU is running
ERROR: Can not read register 62 (FPS29) while CPU is running
ERROR: Can not read register 63 (FPS30) while CPU is running
ERROR: Can not read register 64 (FPS31) while CPU is running
Removing breakpoint @ address 0x1FFF2452, Size = 2
Read 4 bytes @ address 0x00000000 (Data = 0xFFFFFFFF)
Read 4 bytes @ address 0x00000000 (Data = 0xFFFFFFFF)
Hi Jacob,
I notice that your SWD target inferface speed is rather low (not sure how much it matters), but I'm using 1000 kHz (you have 200 kHz). I have pasted an example session on my side (FRDM-K64F).
The other thing which might be relevant:
>>>Target voltage: 1.77 V
Is it really that low?
I have used the circuit/wiring as on the FRDM boards with my design with no problems so far:
- 100n C on Reset to GND
- 10k pullup on Reset to VCC
- SWD CLK and DIO directly to the MCU pins (no pullups and no caps)
Erich
SEGGER J-Link GDB Server V5.41h (beta) Command Line Version
JLinkARM.dll V5.41h (DLL compiled Jun 10 2016 17:44:13)
-----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: on
Init regs on start: on
Silent mode: off
Single run mode: on
Target connection timeout: 0 ms
------J-Link related settings------
J-Link Host interface: USB
J-Link script: none
J-Link settings file: none
------Target related settings------
Target device: MK64FN1M0xxx12
Target interface: SWD
Target interface speed: 1000kHz
Target endian: little
Connecting to J-Link...
J-Link is connected.
Firmware: J-Link V10 compiled Jun 10 2016 13:55:26
Hardware: V10.00
S/N: 600001100
Feature(s): RDI, FlashBP, FlashDL, JFlash, GDB
Checking target voltage...
Target voltage: 3.33 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 = 0x20030000)
Target interface speed set to 30 kHz
Resetting target
Halting target CPU...
...Target halted (PC = 0x00001758)
R0 = 00000000, R1 = 00000000, R2 = 00000000, R3 = 00000000
R4 = 00000000, R5 = 00000000, R6 = 00000000, R7 = 00000000
R8 = 00000000, R9 = 00000000, R10= 00000000, R11= 00000000
R12= 00000000, R13= 20030000, MSP= 20030000, PSP= 00000000
R14(LR) = FFFFFFFF, R15(PC) = 00001758
XPSR 01000000, APSR 00000000, 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
