Stellaris LM4f120 launchpad Power on startup problem

prabudda geekiyanage

Other Parts Discussed in Thread: SW-EK-LM4F120XL

I am new to stellaris Launchpad. I wrote a program to blink LEDs and it runs perfectly on ccs debugger mode .But when i power it up separately it doesn't work .Please help me with this.

my code is

int main(void)
{

ROM_FPUEnable();
ROM_FPUStackingEnable();

ROM_SysCtlClockSet(SYSCTL_SYSDIV_5 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ |
SYSCTL_OSC_MAIN);

/************************************************************************************************/
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);

while(1)
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3, 4);
SysCtlDelay(4000000);
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3, 8);
SysCtlDelay(4000000);
}
}

over 12 years ago

0 Greenja over 12 years ago

Guru 22270 points

Hello Prabudda,

Although my LaunchPad are still in the box, I did look through the EK-LM4F120XL-UM-01 SMPU289 LaunchPad User Manual. Inside that it described Projec0.c.

This example shows you how to blink the LEDs. You should download the wiki http://processors.wiki.ti.com/index.php/Stellaris_LM4F120_LaunchPad_Blink_the_RGB

You should also download the the software for it, I'm sure you will find examples and project0.c in there. http://www.ti.com/tool/sw-ek-lm4f120xl

Just I case you are not able to download the software, I found this example that should interest you: http://codeandlife.com/2012/10/16/ti-stellaris-launchpad-test-run/

Good luck!

0 MaciejKucia over 12 years ago

Mastermind 7925 points

How do you power it up separately? What is the reset signal level when you do not use debugger?

Regards,
Maciej

0 prabudda geekiyanage over 12 years ago in reply to MaciejKucia

Prodigy 50 points

I powered it up using standard USB cable. I am not sure about the reset voltage level ,but since i powerd it up using usb i dont think its a voltage level problem.

I think its some thing with my code.

All the sample codes provided by ti works fine even not in debugging mode.

0 prabudda geekiyanage over 12 years ago in reply to MaciejKucia

Prodigy 50 points

I powered it up using standard USB cable. I am not sure about the reset voltage level ,but since i powerd it up using usb i dont think its a voltage level problem.

I think its some thing with my code.

All the sample codes provided by ti works fine even not in debugging mode

0 MaciejKucia over 12 years ago in reply to prabudda geekiyanage

Mastermind 7925 points

The code seems ok and works ok with my launchpad (also without debug).

The only thing I can think of is missing vector table. Can you upload your project?

Regards,
Maciej

0 prabudda geekiyanage over 12 years ago in reply to MaciejKucia

Prodigy 50 points

7288.qs-rgb.zip

above is my project

0 MaciejKucia over 12 years ago in reply to prabudda geekiyanage

Mastermind 7925 points

After few minutes trying to run your project I realized that the problem is:

//SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);

//GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);

This should be not commented out. Uninitialized peripheral can act randomly. In my case setting pin output did not cause FaultISR during debug.

After uncommenting those lines I was able to see LED change colour with and without debugging.

Hope this helps.

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Stellaris LM4f120 launchpad Power on startup problem