AM3358 EVM - SIMPLE CODE TO TOGGLE J16 (MAVRK CONNECTOR) GPIO1_D0 PIN (AM335X_GPMC_A0) USING SYS/BIOS

Rob,

I haven’t found any GPIO toggle examples using SYS/BIOS on AM335x.  You said you tried PINMUX programs with no success.  Can you please describe what you did and what didn’t work?  It may be best to get that working before trying with SYS/BIOS...

Thanks,
Scott

I'm surprised at the lack of documentation for this processor. I'm simply trying to use it like a micro-controller that has a high speed response to to pulses on the GPIO using a RTOS to detect the starting edges    - Its kind of unique in the industry. I don't really need the more advanced features of the chip at this time.

I'm able to start a BIOS typical project project and run it using XDS200 Debugger.. I'm able to ad a HWI in the app.cfg screen using GPIO1A interrupt number 19 (20 is used for GPIO1_B). I would simply like to detect the edged based on this HWI and start a timer/ counter to count pulses on another digital in. I was hoping to use something like the following code (which is a combination of the sample program with the added GPIOINIT(). GPIO1Afn() is the function to handle the HWI for GPIO1_A interrupt 19. (there is no specific pinmux for this code):

*  ======== main.c ========

*/

//#include <gpio.h>

#include <gpio_v2.h>

#include <hw_gpio_v2.h>

#include <xdc/std.h>

#include <hw_control_AM335x.h>

#include <hw_usbOtg_AM335x.h>

#include <soc_AM335x.h>

#include <xdc/runtime/Error.h>

#include <xdc/runtime/System.h>

#include <ti/sysbios/BIOS.h>

#include <ti/sysbios/knl/Task.h>

/*

*  ======== taskFxn ========

*/

Void taskFxn(UArg a0, UArg a1)

{

   System_printf("enter taskFxn()\n");

   Task_sleep(10);

   System_printf("exit taskFxn()\n");

   System_flush(); /* force SysMin output to console */

}

void GPIOInit()

{

/*GPIOModuleEnable();

GPIOModuleReset();

GPIODirModeSet();

GPIODebounceFuncControl();

GPIODebounceTimeConfig();

GPIOIntTypeSet();

GPIOPinIntEnable();

GPIOPinWrite();

*/

/* Enabling functional clocks for GPIO1 instance. */

   GPIO1ModuleClkConfig();

   /* Selecting GPIO1[23] pin for use. */

   GPIO1Pin23PinMuxSetup();

   /* Enabling the GPIO module. */

   GPIOModuleEnable(GPIO_INSTANCE_ADDRESS);

   /* Resetting the GPIO module. */

   GPIOModuleReset(GPIO_INSTANCE_ADDRESS);

   /* Setting the GPIO pin as an output pin. */

   GPIODirModeSet(GPIO_INSTANCE_ADDRESS,

                  GPIO_INSTANCE_PIN_NUMBER,

                  GPIO_DIR_OUTPUT);

}

}

int GPIO1Afn()

{

int result1 = 0;

return(result1);

}

/*

*  ======== main ========

*/

Int main()

{

GPIOInit();

   Task_Handle task;

   Error_Block eb;

   System_printf("enter main()\n");

   Error_init(&eb);

   task = Task_create(taskFxn, NULL, &eb);

   if (task == NULL) {

       System_printf("Task_create() failed!\n");

       BIOS_exit(0);

   }

   BIOS_start();    /* does not return */

   return(0);

}