9 replies to this topic

[Illishar]

Hullo,

I'm trying to create a small native blinking LED sample for the Netduino. It shouldn't be that difficult.

I'm using the Atmel driver package: http://www.atmel.com...sp?tool_id=3759
And I've based the sample on the "getting-started" sample.

The code is simply:

/// Burn off some cpu time
void Wait(unsigned long delay)
{
	volatile unsigned long c = 0;
	volatile unsigned long dummy = 0;
	while( c < delay*1000)
	{
		dummy++;
	}
}

int main(void)
{
    //configure led
    LED_Configure(0);
    
    // Main loop
    while (1)
    {
    	//write
        LED_Toggle(0);

        //wait
        Wait(1000);
    }
}

Where the LED-functions come from Atmel.

I've changed the led-0 to point at PB24. (The LED!)
I've changed the optimization to O0. (Just in case.)(I've also tried Os though.)
I've changed the chip to at91sam7x512.
(That should do it.)
I've tried with the YAGARTO4.4, YAGARTO4.5, CodeSourcery4.2 and CodeSourcery4.4 without succes.


Have anyone tried out the Atmel package or do someone have a small sample for a blinking LED? Or can anyone see the fatal mistake in my code?

Perhaps I need to enable the "peripheral clock" or something???

I've attached the complete project.

Attached Files

•  getting-started-project.zip   183.94KB   2 downloads

[Illishar]

It would be really helpful to have a small sample that works.

[Illishar]

Btw, the code compiles just fine with all compilers.

[CW2]

Or can anyone see the fatal mistake in my code?

Is the LED always on? If yes, are you sure Wait(1000) waits long enough? It takes only 2 instructions to execute the while loop (1 + 3 clock cycles for add/sub and branch), so at 48 MHz it is like 83 ms for the whole Wait(1000).

[CW2]

/// Burn off some cpu time
void Wait(unsigned long delay)
{
	volatile unsigned long c = 0;
	volatile unsigned long dummy = 0;
	while( c < delay*1000)
	{
		dummy++;
	}
}

Or can anyone see the fatal mistake in my code?

I've just realized the loop is wrong, variable c never changes - there is missing increment.

[Illishar]

LOL, that's a rather n00bish error. I started out with a timer based wait function. This one was just a feeble attempt to do something. I think I'll completly remove the wait and main loop. If I can just make the LED turn off ...

[Illishar]

Perhaps I should loose the nice Atmel package at first.

This ought to turn off the LED:

#define LED_A (1 << 24)
/* Configure the pins as outputs */
AT91C_BASE_PIOA->PIO_OER = LED_A;
/* Enable PIOC control on the pins*/
AT91C_BASE_PIOA->PIO_PER = LED_A;
/* Disable pull-ups */
AT91C_BASE_PIOA->PIO_PPUDR = LED_A;
/* Turn LED off */
AT91C_BASE_PIOA->PIO_SODR = LED_A;

Alas, my board is not within reach right now.

[Chris Walker]

Illishar, Be sure to use PB23 for the LED, not PB24. PB24 is the AREF_SOURCE_CONTROL. PB23 is the LED. In your code sample (one post above this one), be sure to use PIOB and not PIOA Chris P.S. this post makes me grateful for how easy it is to get an LED blinking with C# and .NET MF.

[Illishar]

Be sure to use PB23 for the LED

DOH!

[Illishar]

Thanks for the help. I've posted a small Blinking native project: http://forums.netdui...kingled-native/