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J-Link Compact USB-C Issues
pact USB-C Issues Do you have a J-Link Compact and have noticed it doesn’t work with some USB C to C cables? I do, and I did, so I decided to investigate… Background The J-Link Compact is a really nice debugger for various microcontrollers. The non compact version is rather large and uses USB-B(or Ethernet).
The fact that some type-c cables work but not others strongly points to issues with the CC pull down resistors. In order for the host to know it has an eMarked cable connected, a 1kΩ pull down resistor is present on the second CC line, also referred to as VCONN. A correct implementation would cost them a few cents at most… These days, more and more cables are eMarked and this will cause endless frustration to users.
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