mini2440 ce6.0 bsp
LEDdriver
leddriver.cpp
以下2个函数调用了GPIO设置函数LEDGpioInit()；现在在下面函数中注释掉LEDGpioInit()；
也就是说没有对相应管脚初始化，管脚处于默认状态，查看数据手册，默认状态GPBCON为0x0,默认为输入状态，
修改后编译下载NK.nb0到内存中运行，然后用提供的LED测试程序发现依然可以点亮LED.这应该不正常。请问各位怎么回事啊？
BOOL LEDGpioInit()
{
RETAILMSG(1,(TEXT("LED_Gpio_Setting----\r\n")));
s2440IOP->rGPBCON = (s2440IOP->rGPBCON &~(3 << 10)) | (1<< 10); // GPB5 == OUTPUT.
s2440IOP->rGPBCON = (s2440IOP->rGPBCON &~(3 << 12)) | (1<< 12); // GPB6 == OUTPUT.
s2440IOP->rGPBCON = (s2440IOP->rGPBCON &~(3 << 14)) | (1<< 14); // GPB7 == OUTPUT.
s2440IOP->rGPBCON = (s2440IOP->rGPBCON &~(3 << 16)) | (1<< 16); // GPB8 == OUTPUT.
return TRUE;
}
/*初始化设备，在设备被加载时调用*/
DWORD LED_Init(DWORD dwContext)
{
RETAILMSG(1,(TEXT("LED_Init----\r\n")));
// 1. Virtual Alloc
Virtual_Alloc();
//LEDGpioInit();
mInitialized = TRUE;
return TRUE;
}
//-----------------------------------------------------------------------------
/*对设备发送控制命令*/
//-----------------------------------------------------------------------------
BOOL LED_IOControl(DWORD hOpenContext,
DWORD dwCode,
PBYTE pBufIn,
DWORD dwLenIn,
PBYTE pBufOut,
DWORD dwLenOut,
PDWORD pdwActualOut)
{
//LEDGpioInit();
switch(dwCode)
{
case IO_CTL_LED_1_ON:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT&~(0x1<<5);
break;
case IO_CTL_LED_2_ON:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT&~(0x1<<6);
break;
case IO_CTL_LED_3_ON:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT&~(0x1<<7);
break;
case IO_CTL_LED_4_ON:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT&~(0x1<<8);
break;
case IO_CTL_LED_ALL_ON:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT&~(0xF<<5);
break;
case IO_CTL_LED_1_OFF:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT|(0x1<<5);
break;
case IO_CTL_LED_2_OFF:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT|(0x1<<6);
break;
case IO_CTL_LED_3_OFF:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT|(0x1<<7);
break;
case IO_CTL_LED_4_OFF:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT|(0x1<<8);
break;
/*case IO_CTL_LED_ALL_OFF:
s2440IOP->rGPBDAT=s2440IOP->rGPBDAT|(0xF<<5);
break;*/
default:
break;
}
RETAILMSG(1,(TEXT("LED:Ioctl code = 0x%x\r\n"), dwCode));
return TRUE;
}
