DELAY USING TIMER

Kanchan

Expert 1445 points

Other Parts Discussed in Thread: TMS320C5505

please tell me how to generate the delay of 1 sec using timers of TMS320C5505.

what are the calculations.

over 8 years ago

0 Yordan Kovachev over 8 years ago

TI__Guru**** 161600 points

Hi,

I've notified the team. They will post their feedback directly here.

Best Regards,
Yordan

0 Lalindra Jayatilleke over 8 years ago

TI__Mastermind 30365 points

Kanchan,
Please see the GPT example located in the CSL at C:\ti\c55_lp\c55_csl_3.08\ccs_v6.x_examples\gpt\CSL_GPTExample\csl_gpt_example.c
The top of the .c file has a great explanation on how the timer is calibrated.

Lali

0 Kanchan over 8 years ago in reply to Lalindra Jayatilleke

Expert 1445 points

thanks..its a nice explanation.

but see i want generate 20ms of delay..nowhere mentioned the delay function using timers.

what do i need to do in that file..do i change these values

hwConfig.autoLoad = GPT_AUTO_ENABLE;
hwConfig.ctrlTim = GPT_TIMER_ENABLE;
hwConfig.preScaleDiv = GPT_PRE_SC_DIV_7;/**< Pre scale Divide input clock by 256 */
hwConfig.prdLow = 0xFFFF;
hwConfig.prdHigh = 0x0000;

or what change do i do in the code to get 20ms delay

0 Lalindra Jayatilleke over 8 years ago in reply to Kanchan

TI__Mastermind 30365 points

Kanchan,

Assuming 100MHz system clock:

(20ms * 1000000)/256 = 78125 converted to hex is 0x1312D
So the relevant register settings for 20ms delay is:
hwConfig.prdLow = 0x312D;
hwConfig.prdHigh = 0x0001;

Lali

0 Kanchan over 8 years ago in reply to Lalindra Jayatilleke

Expert 1445 points

thanks a lot

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DELAY USING TIMER