mini2440引脚中断输入配置

今天做一个测试软件，需要修改驱动。即把mini2440的GPIO口之GPG1(EINT9)、GPG9(EINT17)、GPG10(EINT18)设置为中断输入，Both edge triggered，参照wince5.0 BSP驱动userkey进行设置。对

IRQ = 36; //IRQ_EINT8; GPG0

if (!KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, &IRQ, sizeof(UINT32), &g_KeySysIntr[0], sizeof(UINT32), NULL)) {

RETAILMSG(1, (TEXT("ERROR: kEYBD: Failed to request sysintr value.\r\n")));

return FALSE;

}

IRQ =36。为什么是36而不是别的，根据我以往的经验，这个肯定在什么地方定义了，在MSDN中查找KernelIoControl，查到末尾也没有结果，因为这个函数调用的最后是不开源的，见不到函数原型。我转而开始查看包含的头文件，终于在s3c2440a_intr.h中找到了定义。

在初始化过程中，需要先把引脚配置成输入，然后配置中断触发方式。

s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 2)) | (0x2 << 2);
// GPG1 == EINT9

s2440IOP->rEXTINT1 = (s2440IOP->rEXTINT1 & ~(0x7<< 4)) | (0x6 << 4);
// Both edge triggered

s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 18)) | (0x2 << 18);
// GPG9 == EINT17

s2440IOP->rEXTINT2 = (s2440IOP->rEXTINT2 & ~(0x7<< 4)) | (0x6 << 4);
// Both edge triggered

s2440IOP->rGPGCON = (s2440IOP->rGPGCON & ~(0x3 << 20)) | (0x2 << 20);
// GPG10 == EINT18

s2440IOP->rEXTINT2 = (s2440IOP->rEXTINT2 & ~(0x7<< 8)) | (0x6 << 8);
// Both edge triggered