J-Link Commander is unable to connect to my ATSAMS70N19A, and I'm not sure why. Some comments:
Here's the J-Link Commander output:
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And the corresponding traffic over the SWD port. The top group is the zoomed out view, the lower group details a part of the transaction. Yellow trace is RESET_, cyan trace is CLK, magenta trace is DIO. I don't know enough about the protocol to know how to interpret the data:
- The J-Link Base is running V7.62A (i.e. recent)
- VTref is 3.3V as expected
- On the SWD connector, I observe RESET_ going low for 50 mSec, then a clean clock with data
- As suggested by J-Link cannot connect to the CPU, I've reduced the clock rate to 100KHz
Here's the J-Link Commander output:
Source Code
- SEGGER J-Link Commander V7.62a (Compiled Feb 23 2022 17:04:13)
- DLL version V7.62a, compiled Feb 23 2022 17:02:56
- Connecting to J-Link via USB...O.K.
- Firmware: J-Link V10 compiled Nov 2 2021 12:14:50
- Hardware version: V10.10
- S/N: 50123455
- License(s): GDB
- VTref=3.303V
- Type "connect" to establish a target connection, '?' for help
- J-Link>
- Unknown command. '?' for help.
- J-Link>con
- Please specify device / core. <Default>: ATSAMS70N19A
- Type '?' for selection dialog
- Device>
- Please specify target interface:
- J) JTAG (Default)
- S) SWD
- T) cJTAG
- TIF>s
- Specify target interface speed [kHz]. <Default>: 4000 kHz
- Speed>100
- Device "ATSAMS70N19A" selected.
- Connecting to target via SWD
- Found SW-DP with ID 0x0BD11477
- Failed to power up DAP
- Found SW-DP with ID 0x0BD11477
- Failed to power up DAP
- Found SW-DP with ID 0x0BD11477
- Failed to power up DAP
- Found SW-DP with ID 0x0BD11477
- Failed to power up DAP
- Cannot connect to target.
- J-Link>