TMS320F28377D: Question about CPU2 LSPCLKDIV

Squallbilly

Part Number: TMS320F28377D

Hi:

I'm using F28377D ,when i setup SCIA to CPU2,I found ClkCfgRegs.LOSPCP.bit.LSPCLKDIV is 0 not 2 by default,and SCI Baud is not correct.How can i know what the LSPCLK frequency is ?? Thank you !

over 8 years ago

0 Vivek Singh over 8 years ago

TI__Guru** 115881 points

Hi,

"Table 2-164. LOSPCP Register Field Descriptions" in device TRM has the info about this. About default value, are you checking the value after reset or after running the code. It could be possible that some function has changed this value. I would also suggest that you write the required value in this register instead of assuming default value.

Regards,

Vivek Singh

0 Squallbilly over 8 years ago in reply to Vivek Singh

Prodigy 60 points

Hi Vivek:

I have tried to modify the CPU2 LSPCLKDIV register at run time, values read out still 0.I put this code into main loop, still can not motify the value.

EALLOW;
ClkCfgRegs.LOSPCP.bit.LSPCLKDIV = 2;
EDIS;

0 Vivek Singh over 8 years ago in reply to Squallbilly

TI__Guru** 115881 points

And you are doing this from CPU1 code or CPU2?

Vivek Singh

0 Squallbilly over 8 years ago in reply to Vivek Singh

Prodigy 60 points

In CPU2 code

0 Vivek Singh over 8 years ago in reply to Squallbilly

TI__Guru** 115881 points

Hi,

This register is by default accessible by CPU1 only. To access it from CPU2, you need to change the semaphore state. Please refer section "2.12.13.1 Clock Configuration Semaphore" of device TRM for more detail.

Regards,

Vivek Singh

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TMS320F28377D: Question about CPU2 LSPCLKDIV