TMS320F28P650SK: Cold boot Port toggle speed different from CCS PLL debug speed.

Peter Adamcik

Part Number: TMS320F28P650SK
Other Parts Discussed in Thread: LAUNCHXL-F28P65X

Tool/software:

Hi guys, I'm have a serious problem with port toggle speed. I'm using CCS 20.2.0 with iMac OS 10.15.7.

I have written a small assembler program toggling the full 32bit PORT A pins. I've set the PLL to 55Mhz. The PLL clock source is IntOsc2. I've enabled the XCLKOUT pin so I can read the CPU speed with my scope.

Here's the problem.

When I debug my assembler program in CCS 20.2.0 the program runs. The CPU speed reads at 55.5Mhz and PORTA toggle speed reads at 2.2Mhz. Ok, I'm happy with that.

Now when I power off my stand alone board and then power it back on to see if codestart is actually working this is the read outs I get.

CPU speed is 55.5Mhz which is correct and PORTA toggle speed is only 31.4Khz. What happened to PORTA toggle speed?

It's exactly the same code when I run it in CCS20.2.0.

What I need is when I debug and then power off then power on I need it to be the same speed every time.

Please let me know if I need to setup some other registers to fix the PORTA toggling speed problem.

Thanks guys, hope to hear from you soon.

Pete :)

4 months ago

0 Susan Moore 4 months ago

TI__Expert 5040 points

Hello,

I apologize for the delay in response. I have a few questions:
Are you using the LAUNCHXL-F28P65X?

What BOOT modes are you using?

Are you flashing your code or just debugging it in CCS?

Regards,

Susan

0 Peter Adamcik 4 months ago in reply to Susan Moore

Intellectual 280 points

Hi Susan, all good on the late reply.

I'm using a stand-a-loan board that I've designed. The BOOT mode is 4.7k pullup resistors on both boot pins which sets to boot from flash.

Yes I am flashing my code hen power off the on and then PORTA toggling speed is only 31.4khz. If I use debug then PORTA runs a 2.2Mhz.

Do you have any ideas why this is happening?

Peter

0 Peter Adamcik 4 months ago in reply to Susan Moore

Intellectual 280 points

Hi Susan,I forgot to tell you how I've setup my ASM program. I've created a new project in CCS20.2.0 and used the EXTERN to jump to my ASM file. So the C program sets up all the chip settings and then jumps to my ASM program. Hope this helps.

0 Susan Moore 4 months ago in reply to Peter Adamcik

TI__Expert 5040 points

Hello,

What is your build configuration? Most likely the code is not being flashed properly, meaning you may not have your linker file set up for flash. You can reference the CPU1_FLASH build configuration in CCS.
I am going to try and run some examples as well tomorrow to see if I have issues.

Regards,

Susan

0 Peter Adamcik 4 months ago in reply to Susan Moore

Intellectual 280 points

Hi Susan, did you manage to run some examples?

0 Susan Moore 4 months ago in reply to Peter Adamcik

TI__Expert 5040 points

I am incredibly sorry for the lack of response here.

Unfortunately, I wasn't able to run any examples yet, but I did block time tomorrow afternoon and evening to dedicate to this.

Would you be willing to share the program you wrote here so that I can review and test it on my end?

Regards,

Susan

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28P650SK: Cold boot Port toggle speed different from CCS PLL debug speed.