Timer won't start

Vincent St-Pierre

Other Parts Discussed in Thread: SYSBIOS

Hi all,

I'm trying to create a timer with sysbios 6 (6.32.05.24) with the LogicPD SOM OMAP l138. I want to create a timer that will call a function every 1us. I will use this function to create a delay in us.

var ADC_timerParams = new Timer.Params();
ADC_timerParams.instance.name = "ADC_timer";
ADC_timerParams.period = 1;
ADC_timerParams.startMode = xdc.module("ti.sysbios.interfaces.ITimer").StartMode_AUTO;
ADC_timerParams.arg = "&NULL";
Program.global.ADC_timer = Timer.create(0, "&Delay_us", ADC_timerParams);

The Delay_us function just increment a global variable. The problem is that the variable never increment. I post you my main:

void main(void)
{
	
	PSCModuleControl(SOC_PSC_1_REGS, HW_PSC_GPIO, PSC_POWERDOMAIN_ALWAYS_ON,PSC_MDCTL_NEXT_ENABLE);

	//setup the mux for GPIO
	GPIOMuxSetup();
	GPIODirSetup();


	//setup a on board mux
	GPIOPinWrite(SOC_GPIO_0_REGS,GPIO_MUX3_A0,GPIO_PIN_LOW);
	GPIOPinWrite(SOC_GPIO_0_REGS,GPIO_MUX3_A1,GPIO_PIN_LOW);
	GPIOPinWrite(SOC_GPIO_0_REGS,GPIO_MUX4_A0,GPIO_PIN_HIGH);

	Timer_start(ADC_timer);

	BIOS_start();								// start the sysBIOS
}

I'm probably missing something but i can'T see it...

thanks

Vince

over 13 years ago

0 ToddMullanix over 13 years ago

TI__Guru* 96960 points

Hi Vince,

Since you have the timer as StartMode_AUTO, you do not need to call Timer_start. Please remove the call and see if that helps. Also, it looks like you do not need ADC_timerParams.arg. You can just remove that line and take the default (which is null).

Todd

0 Vincent St-Pierre over 13 years ago in reply to ToddMullanix

Intellectual 605 points

Hi Todd,

it's not working...

I try to blink a led using the timer to make a delay, here is my code:

uint8_t ADC_delay_us(uint32_t usec)
{
	if(ADC_delay==usec)
	{
		ADC_delay=0;
		return TRUE;
	}
	else
	{
		return FALSE;
	}
}

The function Delay_us is call by the timer:

void Delay_us(void)
{
	ADC_delay++;
}

The following function it's a task, the task work fine without the ADC_delay_us but with it nothing work....

void test(void)
{
	ADC_delay=0;
	while(1)
	{
		// Sets the GP0[0] to low.
		GPIOPinWrite(SOC_GPIO_0_REGS, 1,GPIO_PIN_LOW);
		while(!(ADC_delay_us(6)));
		// Sets the GP0[0] to high.
		GPIOPinWrite(SOC_GPIO_0_REGS, 1,GPIO_PIN_HIGH);
		while(!(ADC_delay_us(6)));

		Task_sleep(200);
	}
}

0 ToddMullanix over 13 years ago in reply to Vincent St-Pierre

TI__Guru* 96960 points

What does the timers look like in ROV?

Does the Task just get stuck in the first ADC_delay_us?

Is the Timer used by SYSBIOS working? You by looking at the Clock's module ROV page. The ticks should be increasing.

Todd

0 Vincent St-Pierre over 13 years ago in reply to ToddMullanix

Intellectual 605 points

i find why its doesn't work, i can't put "==" in this if(ADC_delay==usec), because the timer is too fast for the function so the variable was greater than usec and its never go in the if...

thanks

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Timer won't start