MCU-PLUS-SDK-AM243X: ProfiNet Demo - Data Handling and Buffers Questions

Hi team,

Is there any update on this?

Thanks,

Connie

Hi
Sorry for the delay in response. We will provide answers by end of this week.

Regards
Dhaval Khandla

Hi

Robin Bross said:

Cyclic Data:

• How is the cyclic data mapped from the application side via the stack API to the PLC side (represented by the GSD file)? 
• How to check for data written by the PLC to the device (Output Data)? Is there a manual how to do this? 
• How are the three buffers required by the input and output buffer function handled and what are the restrictions here (PN_API_DEV_setOutputDataBuffer, PN_API_DEV_setInputDataBuffer)? 
       In the demo the same buffer is provided for three buffer parameters required by the functions. 

The Process Data is mapped in APP_configureSubmodules().

The previously allocated Process Data is now split in submodules/those are assigned to memory regions by defining Offset and Length within Input/Output Data Buffer. We have a video explaining this process, which can be downloaded from following link.

Link : https://tidrive.ext.ti.com/u/zzrCPAY6wjHdOsI0/76487039-a0d0-42de-897e-52b1141e7362?l
Password : 6SmN6F,f

Robin Bross said:

• Acyclic Data 
  • Is there a demo how to handle acyclic data  and how the data is structured for this? 

Acyclic Data for example I&M Data is registered in APP_configureImData within so called I&M Carrier

See Below the I&M Carrier Descriptor:

/*
 *  Example of how different flavors of I&M carriers can be added to the array.
 *  A real submodule must be plugged prior adding an I&M carrier.
 *  Submodule must be able to be an I&M carrier (consistency with GSD).
 *  By adding a new I&M set, don't forget to adjust APP_IM_CARRIER_NUM.
 *
 *   {.api = 0x00000000, .slotNumber = 0x0001, .subslotNumber = 0x0001,
 *   .supportedIm = PN_API_IM_eSUPPORT_IM1 | PN_API_IM_eSUPPORT_IM2 | PN_API_IM_eSUPPORT_IM3,
 *   .deviceRepresentative = false, .moduleRepresentative = true, .memoryIndex = 1},
 *
 *   {.api = 0x12344567, .slotNumber = 0x00aa, .subslotNumber = 0x00fe,
 *   .supportedIm = PN_API_IM_eSUPPORT_IM2,
 *   .deviceRepresentative = false, .moduleRepresentative = false, .memoryIndex = 2},
 */
static const APP_SImCarrierDescriptor_t imCarrierDescriptors_s[APP_IM_CARRIER_NUM] =
{
    {.api = 0x00000000, .slotNumber = 0x0000, .subslotNumber = 0x0001,
    .supportedIm = PN_API_IM_eSUPPORT_IM1 | PN_API_IM_eSUPPORT_IM2 | PN_API_IM_eSUPPORT_IM3 | PN_API_IM_eSUPPORT_IM4,
    .deviceRepresentative = true, .moduleRepresentative = true, .memoryIndex = 0}
};

The I&M Carrier is filled in APP_createImDataCarrier.

It is processed by the PROFINET Stack when given to PN_API_IM_addImCarrier.

Robin Bross said:

Evaluation License

• We faced the issue, that the demo stops to work after some time (about 1h) 
  • Is there a possibility to get a  demo without time limitations? 

Demos without time limitations are planned for 2Q 2022.

Regards
Dhaval Khandla

Thank you very much for this detailed answer. 

The video is a good reference to understand how the buffer is assigned to the submodules. 

I still have a one more questions, that would help us to proceed with the evaluation: 

• How are the three buffers required by the input and output buffer function handled and what are the restrictions here (PN_API_DEV_setOutputDataBuffer, PN_API_DEV_setInputDataBuffer)? 
  In the demo the same buffer is provided for three buffer parameters required by the functions. 

It would be great if we could get a reference, where we can find more information about this mechanism. 

Regards 
Robin

Hello Dhaval,

can you tell us what will be changed to the current Profinet Stack in the SDK 8.3? 

Thanks and Best Regards
Robin 

https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/08_04_00_17/exports/docs/api_guide_am243x/INDUSTRIAL_COMMS_TI_STACK.html#INDUSTRIAL_COMMS_TI_STACK_PROFINET_STACK_TRANSITION