AWR2944EVM: Main frequency problem of 2944LC

Kevin Zhang

Part Number: AWR2944EVM

Tool/software:

In the process of adjusting the ARM Cortex-M4 core frequency to 200MHz and the R5F core frequency to 400MHz, if the input frequency of QSPI (Quad Serial Peripheral Interface) needs to be modified to 75MHz, this may affect other external settings using the same clock source For example, if the CAN (Controller Area Network) controller also relies on this clock source, its input frequency will also be equal to 75MHz.

According to

CanBuad=SourceClk/(RatePrescalar+1)/(TimeSeg1+TimeSeg2+3)

SamplePoint=1−(TimeSeg2+1)/(TimeSeg1+TimeSeg2+3)

how to realized baud rate: 500K arbitration rate, 2M data rate

9 months ago

0 Saswat Kumar 9 months ago

TI__Mastermind 35295 points

Hello Kevin,

You can refer the clock chapter in the in TRM and find alternate sources for the CAN and QSPI as well, which can enable you to use the frequency you need.

Regards,
Saswat Kumar

0 Kevin Zhang 9 months ago in reply to Saswat Kumar

Prodigy 80 points

Can you help with the configuration? This clock instruction is too complex.

Thanks

0 Saswat Kumar 9 months ago in reply to Kevin Zhang

TI__Mastermind 35295 points

Hello Kevin,

You need to give me your current clock configuration and what you want.
I am not telling you to code first, but rather create a chart like this:

You can see here as per the PLL we write how much the PLL is operating at and how much the dividers have.
You will need an initial design like this to understand what to change.

Which dividers can be used for each PLL needs to be taken from what are the source available for that.

I can't advise you until you are not sure of what you want and what your initial tree and expected tree looks like. What the various sources from where it takes the clock sources are as well.

Regards,
Saswat Kumar

0 Saswat Kumar 9 months ago in reply to Kevin Zhang

TI__Mastermind 35295 points

If you just want to know how to configure CAN speed you can refer this

0 Kevin Zhang 9 months ago in reply to Saswat Kumar

Prodigy 80 points

Thanks, but the page is not found

0 Kevin Zhang 9 months ago in reply to Saswat Kumar

Prodigy 80 points

I want set R5 core 400M, M4 core 200M

The method provided by FAE to set the QSPI input clock to 75M.

So, set the CAN input clock to 75M

CAN baud rate: 500K arbitration rate, 2M data rate

0 Saswat Kumar 8 months ago in reply to Kevin Zhang

TI__Mastermind 35295 points

Hi Kevin,

Looks like there was some technical issues, I have updated the answer:

Saswat Kumar said:
If you just want to know how to configure CAN speed you can refer this

Regards,
Saswat Kumar

0 Saswat Kumar 8 months ago in reply to Kevin Zhang

TI__Mastermind 35295 points

You can set perpll to 1200 Mhz:

And derive the 80 Mhz out of this as both the peripherals can derive 80 Mhz from 1200 Mhz.

The choice is upto you and your implementation, the options are all available as I stated above.

0 Kevin Zhang 8 months ago in reply to Saswat Kumar

Prodigy 80 points

Can you tell me how to configure the perpll to 1200M. Especially when it comes to code implementation

0 Saswat Kumar 8 months ago in reply to Kevin Zhang

TI__Mastermind 35295 points

Hello Kevin,

Please review the file: mcu_plus_sdk_awr294x_09_02_00_15\source\drivers\bootloader\soc\awr294x\bootloader_soc.c

All the PLL clock configurations are set here in the function: Bootloader_socConfigurePll

After making changes, please rebuild driver then application.

Regards,
Saswat Kumar

0 Kevin Zhang 8 months ago in reply to Saswat Kumar

Prodigy 80 points

Hi Saswat Kumar,

I find the modified position, but I don't find the Saswat Kumar. The photos are as follows

My version fo SDK is "mmwave_mcuplus_sdk_04_07_00_01"

So, what should I do next.

Thanks

0 Saswat Kumar 8 months ago in reply to Kevin Zhang

TI__Mastermind 35295 points

hello Kevin,

You can just use 600 as well, right? 1200 was just a value an example I gave you.
Please try to understand the concept properly before attempting to change this.
You will also need to make appropriate changes in the driver clock configuration, I hope you know what change you did for the 75 Mhz setting because you will also need to reverse it.

Regards,
Saswat Kumar

0 Kevin Zhang 8 months ago in reply to Saswat Kumar

Prodigy 80 points

Hi Kumar

My friend. I don't know how to modify clock. The method of setting 75MHz was coming from FAE of TI.

I also try to analysis the code of " mcu_plus_sdk_awr294x_09_02_00_15\source\drivers\bootloader\soc\awr294x\bootloader_soc.c", but too few code annotations.

I also analysis the clock chapter in the in TRM.

So, how to establish contact between code and documentation?

You are right. I need to make appropriate changes in the driver clock configuration.

So, I hope you can supply the more detailed clock configuration operation correspond between code and operation

Thanks! My friend!

+1 Saswat Kumar 8 months ago in reply to Kevin Zhang

TI__Mastermind 35295 points

Hello Kevin,

1) First in the clock:

2) mcu_plus_sdk_awr294x_09_02_00_15\source\drivers\.meta\qspi\soc\qspi_awr294x.syscfg.js

3) mcu_plus_sdk_awr294x_09_02_00_15\source\drivers\.meta\mcan\soc\mcan_awr294x.syscfg.js

4) Rebuild drivers and then application and ensure in your syscfg you are not setting 75 Mhz anywhere.

If it works then it should be fine for you, or else you can check the clock status registers and see if all the changes are reflecting properly.

Regards,
Saswat Kumar

0 Kevin Zhang 8 months ago in reply to Saswat Kumar

Prodigy 80 points

Hi Kumar,

My friend! Thank you very match!

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AWR2944EVM: Main frequency problem of 2944LC