辛勤的工程师及各位大神好：
小弟最近在用omapl138学习6748，想利用板子上的button实现一个外部中断，结合starterware中的一些例程写好了程序，但是中断不运行，一直摸不着头脑，请各位大神指导。
#include "gpio.h"
#include "psc.h"
#include "interrupt.h"
#include "soc_C6748.h"
#include "lcdkC6748.h"
/****************************************************************************/
/* LOCAL FUNCTION PROTOTYPES */
/****************************************************************************/
static void ConfigureInt(void);
static void ButtonTriggerLED(void);
static void GPIOIsr(void);
static void Delay(volatile unsigned int delay);
/****************************************************************************/
/* GLOBAL VARIABLES */
/****************************************************************************/
volatile unsigned char flag = 0;
/****************************************************************************/
/* LOCAL FUNCTION DEFINITIONS */
/****************************************************************************/
void main(void)
{
/* The Local PSC number for GPIO is 3. GPIO belongs to PSC1 module.*/
PSCModuleControl(SOC_PSC_1_REGS, HW_PSC_GPIO, PSC_POWERDOMAIN_ALWAYS_ON, PSC_MDCTL_NEXT_ENABLE);
/* Pin Multiplexing of pin 12 & 13 of GPIO Bank 6.*/
GPIOBank6Pin12PinMuxSetup();
GPIOBank6Pin13PinMuxSetup();
GPIOBank2Pin4PinMuxSetup();
GPIOBank2Pin5PinMuxSetup();
/* Sets the pin 109 (GP6[12]) & 110 (GP6[13]) as output.*/
GPIODirModeSet(SOC_GPIO_0_REGS, 109, GPIO_DIR_OUTPUT);
GPIODirModeSet(SOC_GPIO_0_REGS, 110, GPIO_DIR_OUTPUT);
/* Sets the pin 37 (GP2[4]) & 38 (GP2[5]) as input.*/
GPIODirModeSet(SOC_GPIO_0_REGS, 37, GPIO_DIR_INPUT);
GPIODirModeSet(SOC_GPIO_0_REGS, 38, GPIO_DIR_INPUT);
/* Configure rising edge trigger on pin 37 (GP2[4]) & 38 (GP2[5]) to generate an interrupt.*/
GPIODirModeSet(SOC_GPIO_0_REGS, 37, GPIO_INT_TYPE_RISEDGE);
//GPIODirModeSet(SOC_GPIO_0_REGS, 38, GPIO_INT_TYPE_RISEDGE);
/*Enable interrupts for Bank 2.*/
GPIOBankIntEnable(SOC_GPIO_0_REGS, 2);
ConfigureInt();
while(1)
{
if(flag == 1)
{
ButtonTriggerLED();
}
}
}//end of main
/*
** \brief This function sets up the status of interrupt.
**
*/
static void ConfigureInt(void)
{
IntDSPINTCInit(); //initialize the interrupt controller
IntGlobalEnable(); //enable DSP CPU interrupts globally
IntRegister(C674X_MASK_INT4, GPIOIsr); //register the ISR in the interrupt vector table
IntEventMap(C674X_MASK_INT4, SYS_INT_GPIO_B2INT); //map the system event GPIO_Bank2(BUTTON) to CPU INT4
IntEnable(C674X_MASK_INT4); //enable the CPU masked INT4
IntEventSet(SYS_INT_GPIO_B2INT); //set the EVTFLAG register of GPIO_Bank2
}
/*
** \brief Interrupt Service Routine to be executed on GPIO interrupts.
** This disables the bank interrupts, clears the system interrupt
** status and pin interrupt status. This also sets flag as 1.
*/
static void GPIOIsr(void)
{
/* Disable the interrupts for pins of bank 2 in GPIO.*/
GPIOBankIntDisable(SOC_GPIO_0_REGS, 2);
/* Clear the system interrupt status in the DSPINTC*/
IntEventClear(SYS_INT_GPIO_B2INT);
/* Clears the Interrupt Status of GP2[4] in GPIO.*/
GPIOPinIntClear(SOC_GPIO_0_REGS, 37);
flag = 1;
}
/*
** \brief This function can respond the interrupt.
*/
static void ButtonTriggerLED(void)
{
Delay(0x1FFF);
IntGlobalDisable(); //disable DSP CPU interrupts globally
/* Clear the system interrupt status in the DSPINTC*/
IntEventClear(SYS_INT_GPIO_B2INT);
/* Clears the Interrupt Status of GP2[4] in GPIO.*/
GPIOPinIntClear(SOC_GPIO_0_REGS, 37);
if(GPIOPinRead(SOC_GPIO_0_REGS, 37))
{
GPIOPinWrite(SOC_GPIO_0_REGS, 109, GPIO_PIN_HIGH);
GPIOPinWrite(SOC_GPIO_0_REGS, 110, GPIO_PIN_LOW);
Delay(1000000);
GPIOPinWrite(SOC_GPIO_0_REGS, 109, GPIO_PIN_LOW);
GPIOPinWrite(SOC_GPIO_0_REGS, 110, GPIO_PIN_HIGH);
Delay(1000000);
}
else
{
GPIOPinWrite(SOC_GPIO_0_REGS, 109, GPIO_PIN_LOW);
GPIOPinWrite(SOC_GPIO_0_REGS, 110, GPIO_PIN_LOW);
}
flag = 0;
/*Enable interrupts for Bank 2.*/
GPIOBankIntEnable(SOC_GPIO_0_REGS, 2);
}
/*
** \brief This function can be called to generate a delay.
*/
static void Delay(volatile unsigned int delay)
{
while(delay--);
}
/*****************************END OF FILE************************************/
