TM4C129DNCPDT: TI RTOS

Hello Charles,

Thank you for your prompt response.

We have done the initialization.

SysCtlPeripheralEnable( SYSCTL_PERIPH_GPION );
while(!SysCtlPeripheralReady(SYSCTL_PERIPH_GPION))
{

}
GPIOPinTypeGPIOOutput(GPIO_PORTN_BASE,
GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2|GPIO_PIN_1|GPIO_PIN_0);

Sorry but still getting same problem.

Regards,
Archie A.

Hi,

  I just modify the stock TI-RTOS gpiointerrupt example for Tiva. I added the line highlighted in red. I don't see any bus fault. Why don't you try it first? Perhaps show your code too. 

/*
* ======== gpiointerrupt.c ========
*/

/* XDCtools Header files */
#include <xdc/std.h>
#include <xdc/runtime/System.h>

/* BIOS Header files */
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Task.h>

/* TI-RTOS Header files */
#include <ti/drivers/GPIO.h>

/* Example/Board Header files */
#include "Board.h"

//------------------------------------------
// TivaWare Header Files
//------------------------------------------
#include <stdint.h>
#include <stdbool.h>

#include "inc/hw_types.h"
#include "inc/hw_memmap.h"
#include "driverlib/sysctl.h"
#include "driverlib/gpio.h"

/* variable to be read by GUI Composer */
int count = 0;

/*
* ======== gpioButtonFxn0 ========
* Callback function for the GPIO interrupt on Board_BUTTON0.
*/
void gpioButtonFxn0(unsigned int index)
{
/* Clear the GPIO interrupt and toggle an LED */
GPIO_toggle(Board_LED0);

if (count++ == 100) {
count = 0;
}
}

/*
* ======== gpioButtonFxn1 ========
* Callback function for the GPIO interrupt on Board_BUTTON1.
* This may not be used for all boards.
*/
void gpioButtonFxn1(unsigned int index)
{
/* Clear the GPIO interrupt and toggle an LED */
GPIO_toggle(Board_LED1);

if (count++ == 100) {
count = 0;
}
}

/*
* ======== main ========
*/
int main(void)
{
/* Call board init functions */
Board_initGeneral();
Board_initGPIO();
Board_initUART();

/* Turn on user LED */
GPIO_write(Board_LED0, Board_LED_ON);

SysCtlPeripheralEnable( SYSCTL_PERIPH_GPION );
while(!SysCtlPeripheralReady(SYSCTL_PERIPH_GPION))
{

}
GPIOPinTypeGPIOOutput(GPIO_PORTN_BASE,
GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2|GPIO_PIN_1|GPIO_PIN_0);
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2|GPIO_PIN_1|GPIO_PIN_0,
GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2|GPIO_PIN_1|GPIO_PIN_0);

System_printf("Starting the GPIO Interrupt example\nSystem provider is set"
" to SysMin. Halt the target to view any SysMin contents in"
" ROV.\n");
/* SysMin will only print to the console when you call flush or exit */
System_flush();

/* install Button callback */
GPIO_setCallback(Board_BUTTON0, gpioButtonFxn0);

/* Enable interrupts */
GPIO_enableInt(Board_BUTTON0);

/*
* If more than one input pin is available for your device, interrupts
* will be enabled on Board_BUTTON1.
*/
if (Board_BUTTON0 != Board_BUTTON1) {
/* install Button callback */
GPIO_setCallback(Board_BUTTON1, gpioButtonFxn1);
GPIO_enableInt(Board_BUTTON1);
}

/* Start BIOS */
BIOS_start();

return (0);
}

Thank you, Charles.

We have observed one thing if GPIOWrite instruction is just after initialization then it has no issue. But in real scenario it is not possible.

// *****************No issue
SysCtlPeripheralEnable( SYSCTL_PERIPH_GPION );
while(!SysCtlPeripheralReady(SYSCTL_PERIPH_GPION))
{
}
GPIOPinTypeGPIOOutput(GPIO_PORTN_BASE,
GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2|GPIO_PIN_1|GPIO_PIN_0);
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2|GPIO_PIN_1|GPIO_PIN_0,
GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2|GPIO_PIN_1|GPIO_PIN_0);

//****************with issue

SysCtlPeripheralEnable( SYSCTL_PERIPH_GPION );
while(!SysCtlPeripheralReady(SYSCTL_PERIPH_GPION))
{
}
GPIOPinTypeGPIOOutput(GPIO_PORTN_BASE,
GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2|GPIO_PIN_1|GPIO_PIN_0);
// some others instructions then Gpio write instruction

GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2|GPIO_PIN_1|GPIO_PIN_0,
GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2|GPIO_PIN_1|GPIO_PIN_0);

Regards,
Archie A.

Hi,

  so where exactly in your code that fails? Is it on GPIOPinWrite or inside your some other instructions before the GPIO write. What are these some other instructions? Can you do a single step?