topic Re: Need information on API for the USB tether in MCUXpresso General

Need information on API for the USB tether

christopherpass — Sat, 10 Jun 2017 03:11:08 GMT

We have a Forth implementation that runs on TI MSP430 standard and ARM based PoSC's. Efforts are being made to finalize implementation on both the Cypress and Zilog ARM parts. TI, Cypress and Zilog provide an API to access the USB shim that controls the debug interface and serial comms to/from the target USB tether. Their IDE's access the target thru the same API - Each has a different API of course.

We seek info on what API is available for NXP tethered parts so we can port Forth here also.

Thx.

Re: Need information on API for the USB tether

jingpan — Fri, 16 Jun 2017 03:21:24 GMT

Hi Christopher,

Do you mean that there is a debug program in the MCU and you want a virtual serial port to connect with ther debug program?

Regards

Re: Need information on API for the USB tether

christopherpass — Fri, 16 Jun 2017 22:13:20 GMT

No Sir. For TI and Code Composer Studio (their IDE) all communications with the `USB Tethered Target' is thru their Debug API which is also the USB interface driver. The Target is controlled thru its JTag port. The Debug API also provides a back-channel serial port to communicate with the Target - No need for wiring-up a cable. Zilog, Digi and Cypress implementations have similar functionality. The API for the USB/Tether provides the ability to program and optionally debug the Target. The TI implementation even allows you to set the Target operating power voltage allowing you to debug the Target in `low power modes'. So I seek the API information for the NXP USB/Tether.

Rgards.

Re: Need information on API for the USB tether

jingpan — Mon, 19 Jun 2017 07:11:13 GMT

Hi Christopher,

In almost all NXP's MCU evaluaction board(TWR or FRDM), there is a openSDA port which work as the Debug interface. It's not only a JTAG/SWD adaptor, but also can work as a serial port simultaneously, no need for wiring-up a cable.

Please visit www.freescale.com/opensda to get the information and source code of the debugger.

Regards