RTOS/TMDSEVM572X: 0.1µs timer

Anjana Pathak0

Expert 2205 points

Part Number: TMDSEVM572X
Other Parts Discussed in Thread: SYSBIOS

Tool/software: TI-RTOS

Hi,

EVM: GP Evm AM572x.

TIRTOS: processor_sdk_rtos_am57xx_3_02_00_05

I am using 1 microsecond timer isr. How can i make it to 0.1 microsecond timer?

My current code for timer initialization is

void TimerInitialization()
{
Timer_Params timerParams;
Timer_Handle myTimer;
Error_Block eb;
Error_init(&eb);
Timer_Params_init(&timerParams);
timerParams.period = 1;
timerParams.periodType = Timer_PeriodType_MICROSECS;
timerParams.arg = 1;
timerParams.startMode = Timer_StartMode_AUTO;

myTimer = Timer_create(Timer_ANY, myIsr, &timerParams, &eb);
if (myTimer == NULL) {
System_abort("Timer create failed");
}

}

Thanks,

Anjana Pathak

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The RTOS team have been notified. They will respond here.

0 lding over 8 years ago in reply to Biser Gatchev-XID

TI__Guru* 95265 points

Hi,

From SYSBIOS, software-dl.ti.com/.../Timer.html

typedef enum Timer_PeriodType {
Timer_PeriodType_MICROSECS,
Timer_PeriodType_COUNTS
} Timer_PeriodType;

You can use Timer_PeriodType_COUNTS and specify number of counts for 0.1us.

Regards, Eric

0 Anjana Pathak0 over 8 years ago in reply to lding

Expert 2205 points

Thanks a lot...
If i select the period type as Timer_PeriodType_COUNTS and period = 1, then the timer isr will call at every tick. Core frequency is set to OPP_NOM so runs at 1000MHz. one tick time is 1/1000MHz = 0.001us. To call isr at 0.1us the Period should be set to 10.

Is this correct?Please let me know.

Anjana Pathak

0 lding over 8 years ago in reply to Anjana Pathak0

TI__Guru* 95265 points

Hi,

Please check the AM572x TRM, Chapter 22. The timer clock:
Each timer (except TIMER12) can be clocked from the system clock (19.2, 20, or 27 MHz) or the 32-kHz
clock. The selection of clock source is made at the power, reset, and clock management (PRCM) module
level. TIMER12 can be clocked only from the internal oscillator (on-die oscillator). For more information,
see Section 3.6.3.1, PRM Clock Source.

Then Table 3-41. CM_CORE_AON_TIMER Clock Division and Muxing Control, check the default clock input for the timer you want to use. If it is sys_clk1, then it is 20MHz on TI AM572x GP EVM. That is 50 ns, if you want 0.1us = 100 ns, the count would be 2.

Regards, Eric

0 Anjana Pathak0 over 8 years ago in reply to lding

Expert 2205 points

Hi,

As per the file attached all timers are set to default SYS_CLK1. this is what i understood after going through TRM.cslr_l4per_cm_core_component.h

And i created timer using below function

myTimer = Timer_create(Timer_ANY, myIsr, &timerParams, &eb);

Thanks,

Anjana Pathak

0 Anjana Pathak0 over 8 years ago in reply to lding

Expert 2205 points

But when i set Period to 2 my TCPIP communication hangs on ....
For Period = 5 and 10 it works..

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RTOS/TMDSEVM572X: 0.1µs timer