Kinetis Microcontrollers中的主题 Re: K70 SPI transmission end detection?

K70 SPI transmission end detection?

crezyoz — Mon, 27 Aug 2012 00:24:25 GMT

Hello

I have a port pin I need to toggle immediately after the SPI output is complete. I am using Processor Expert's routines. I have tried the SM1_GetBlockSentStatus() call as a test to determine if the transmission is complete but it is still premature. Embarrasingly, looking at the PE code I can't really tell how the SPI registers are accessed.

Any hints as to how I can tell when an entire buffer has been completely transmiited would be very helpful.

Re: K70 SPI transmission end detection?

mjbcswitzerland — Mon, 27 Aug 2012 03:31:16 GMT

See the section on SPI in http://www.utasker.com/docs/KINETIS/uTaskerV1.4_Kinetis_demo.pdf

The diagrams show the timing of the DSPI status flags.

Regards

Mark

Re: K70 SPI transmission end detection?

crezyoz — Mon, 27 Aug 2012 03:43:21 GMT

Thanks Mark.

I didn't see anything in that pdf that relates to my question though.

Which bit is valid after all data has been shifted out of a que?

I am using a P.E. SPI module and so far have been unable to acquire the proper indication that the last byte has been transmitted.

Appreciate the response.