使用.NET MF 实现数字反射传感器？

Question

我使用带有微控制器和数字反射传感器的.NET MF。我需要在 C# 中实现以下伪代码以从传感器读取数据。我使用 GHIElectronics.NETMF.FEZ 作为输入/输出端口。这是我正在使用的产品 http://www.sparkfun.com/products/9454

int QRE1113_Pin = 2; //connected to digital 2

void setup(){
Serial.begin(9600);
}

void loop(){

int QRE_Value = readQD();
Serial.println(QRE_Value); 

}

int readQD(){
//Returns value from the QRE1113 
//Lower numbers mean more refleacive
//More than 3000 means nothing was reflected.
pinMode( QRE1113_Pin, OUTPUT );
digitalWrite( QRE1113_Pin, HIGH );
delayMicroseconds(10);
pinMode( QRE1113_Pin, INPUT );

long time = micros();

//time how long the input is HIGH, but quit after 3ms as nothing happens after that
while (digitalRead(QRE1113_Pin) == HIGH && micros() - time < 3000);
int diff = micros() - time;

return diff;

编辑：我用来

new InputPort((Cpu.Pin)FEZ_Pin.Digital.IO44, false, Port.ResistorMode.Disabled)

创建输入端口和

new OutputPort((Cpu.Pin)FEZ_Pin.Digital.IO44, false)

创建输出端口，但我不知道如何将引脚模式从输出更改为输入或将引脚设置为高电平