F28377S Launchpad Clocking

Mike H Meyer

I am working with the launch pad demo board LAUNCHXL-F28377S. I am setting up a SYS-BIOS application and somehow my timer does not seem to be correct. I cannot find much info on how to set up the bios tick timer in the cfg file for the app. There are oscillators and CPU speed and none of these make sense to me given this is a 200 Mhz micro. The CPU speed indicate 5 MHZ. Is there a sample SYS-BIOS app for the launch pad that I can look at or can you tell me what these settings should be?

over 9 years ago

0 Moses Isang over 9 years ago

TI__Expert 8175 points

Hi Mike,
What are you trying to achieve with the timer? Are you saying your seeing the CPU speed as 5MHz? If so where are you seeing that? If you can attach the code snippets from your application where you setup the timer, that will be great.

Thanks,
Moses

0 judahvang over 9 years ago

TI__Mastermind 32475 points

Mike,

I think you need to configure the Boot module to match the desired CPU speed that you want.

Judah

0 maurywalters over 9 years ago in reply to Moses Isang

Intellectual 710 points

I am having similar problem
On the boot options screen for clock configuration it shows
OSCCLK = 20Mhz
PLL integer multiplier 1
PLL fractional multiplier 0
Sys Clk divider 2
Computer CPU Freq is 5 MHz

What is the oscillator on the launchpad ?
The sample BIOS apps I run are at about half speed.

In addition I would live to get access to the Low speed clock frequency used in setting peripheral communication rates.
Where (what include file) is the variable for low speed clock frequency?

0 ToddMullanix over 9 years ago in reply to maurywalters

TI__Guru* 96960 points

Can you open a new thread? Please include the version of SYS/BIOS you are using and the device you are using.

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F28377S Launchpad Clocking