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RTOS/TMDSICE3359: Profibus Master communication issue

Expert 2590 points
Part Number: TMDSICE3359
Other Parts Discussed in Thread: PROFIBUS, ISO1176T

Tool/software: TI-RTOS

I have succesfully tested Profibus slave example, and wanted to test the master. I just can't see any communication when the master software runs. I created the project like it is explained in PRU ICSS Profibus Master (wiki): projectCreate.bat AM335x arm profibus_master. I had to to add EnableTimers_32KHz(); to gel file to get it past Timer_create function. Other than that I did not make any changes to project. I start it by selecting debug project and it runs ok and waits on "connecting board...".

As I don't have any slaves at the moment I checked the RS485 lines with oscilloscope but I can't see any activity. Should it at least send something out even tho there are no slaves connected? I also checked the ISO1176T (U28) pins, but the Txd didn't change it state. Am I doing something wrong? Do I have to configure the project or change something in project to get it work?

Versions:

pdk_am335x_1_0_7

processor_sdk_rtos_am335x_4_00_00_04

PRU-ICSS-Profibus_Master_01.00.01.00

CCS 7.4

JHi