AM2434: SDFM peripheral - questions

Hi Geoffrey,

We have firmware support for SDFM. You can find example projects in the Motor Control SDK:
https://www.ti.com/tool/download/MOTOR-CONTROL-SDK-AM243X/11.00.00.06

For information about supported features, please refer to the Motor Control SDK documentation, which provides detailed information about available features and support in the SDK:
https://software-dl.ti.com/processor-industrial-sw/esd/motor_control_sdk/am243x/11_00_00_06/docs/api_guide_am243x/CURRENT_SENSE.html

Regarding the SDFM hardware interface available on the AM243x, please see section "6.4.5.2.2.3.5 Sigma Delta (SD) Decimation Filtering" in the AM243x Technical Reference Manual (TRM):
www.ti.com/.../spruim2h.pdf

Thanks & regards,

Achala Ram  

Hi Achala, 

Thanks for the link sot the documentation but it doesn't answer my questions. In particular :

1. is it possible to change the OSR dynamically without resetting the SDFM module ?
2. Is all the SW related to the SDFM module available in source files, or some is delivered as library ?

Regards

Geoffrey 

Hi Geoffrey,

Geoffrey Ficara said:

is it possible to change the OSR dynamically without resetting the SDFM module ?

can you share more details about use case side how and when you want to change ?Yes, You can change the OSR value at runtime without resetting modulr, but note that the accumulator and differentiator will still contain old values. It will take 2-3 samples (depending on the filter type) for all register values to stabilize after changing OSR. 

Geoffrey Ficara said:

Is all the SW related to the SDFM module available in source files, or some is delivered as library ?

All software related to the SDFM module is available in the SDK only. Examples are available in the examples folder, and the firmware and driver source files are present in the source folder. 

 BR,

Achala Ram

Hi, 

Geoffrey's questions are for my needs, so I could complete them:

1. and 2. for example C2000 SDFM have fifo but it seems to not be the case for PRU SDFM. So do you have a list of difference between C2000 SDFM and AM243x PRU SDFM?

3. I already have this question for C2000 (TMS320F28P650DH: Change OSR dynamically - C2000 microcontrollers forum - C2000︎ microcontrollers - TI E2E support forums) but as AM243x PRU SDFM is combination of HW ad SW, the answer could be differente. With C2000 I've tried to change OSR in SDFM ISR and this have impact on output datas, but on AM2434, nothing happened as if my new OSR value has not been taken into account

4. The questions is about the PRU software, not the driver. Is the SDFM functionnality only available as binary, or is it possible to have the source code if I want to enhance it?

Thanks

Gildas