I2C總線的模擬器的.Net Micro Framework實現
I2C以前沒有怎么接觸過，所以做它的模擬功能，只能靠著感覺走，有不妥之處，還望方家指正。做出了spi相關的模擬功能，做I2C相對也就不難了，只不過用戶操作I2C總線讀寫數據的時候要稍微麻煩一點。
測試程序運行界面：
模擬器中的I2C總線的相關代碼如下：
public class I2CComponent : I2cDevice
{
public byte[] bytData = new byte[8];
protected override void DeviceRead(byte[] data)
{
try
{
for (int i = 0; i < data.Length; i++)
{
if (i < bytData.Length) data[i] = bytData[i];
}
}
catch { }
base.DeviceRead(data);
}
protected override void DeviceWrite(byte[] data)
{
try
{
for (int i = 0; i < data.Length; i++)
{
if (i < bytData.Length) bytData[i] = data[i];
}
}
catch { }
base.DeviceWrite(data);
}
protected override void DeviceBeginTransaction()
{
base.DeviceBeginTransaction();
}
protected override void DeviceEndTransaction()
{
base.DeviceEndTransaction();
}
}
測試代碼如下（還是在原來程序的基礎上進行擴充）：
static SPI _spi;
public static void Main()
{
OutputPort[] output = new OutputPort[8];
InputPort[] input = new InputPort[8];
//葉帆模擬器GPIO的pin定義
Cpu.Pin[] pin_I = new Cpu.Pin[8] { (Cpu.Pin)10, (Cpu.Pin)11, (Cpu.Pin)12, (Cpu.Pin)13, (Cpu.Pin)14,(Cpu.Pin)15, (Cpu.Pin)16, (Cpu.Pin)17 };
Cpu.Pin[] pin_Q = new Cpu.Pin[8] { (Cpu.Pin)20, (Cpu.Pin)21, (Cpu.Pin)22, (Cpu.Pin)23, (Cpu.Pin)24, (Cpu.Pin)25, (Cpu.Pin)26, (Cpu.Pin)27 };
//SPI的pin定義
_spi=new SPI(new SPI.Configuration((Cpu.Pin)30, true, 0, 0, false, false, 4000, SPI.SPI_module.SPI1));
//I2C定義 模擬器I2C地址為100 時鐘速度不要設置太小否則會有問題
I2CDevice I2CBus = new I2CDevice(new I2CDevice.Configuration(100, 200));
for (int i = 0; i < 8; i++)
{
input[i] = new InputPort(pin_I[i], false, Port.ResistorMode.PullDown);
output[i] = new OutputPort(pin_Q[i], false);
}
int intNum = 0;
while (true)
{
output[intNum].Write(!output[intNum].Read());
Debug.Print("I : "+input[0].Read().ToString() + " " + input[1].Read().ToString() + " " + input[2].Read().ToString() + " " + input[3].Read().ToString() + " " + input[4].Read().ToString()+ " " + input[5].Read().ToString() + " " + input[6].Read().ToString() + " " + input[7].Read().ToString());
Debug.Print("AD : "+ReadWriteAD((Int16)intNum).ToString() + " " + intNum.ToString());
//---------------------------------------
//I2C讀寫
byte[] bytRData = new byte[8];
byte[] bytWData = new byte[3];
bytWData[0] = (byte)intNum;
bytWData[1] = (byte)(intNum * 2);
bytWData[2] = (byte)(intNum * 3);
I2CDevice.I2CTransaction[] i2c = new I2CDevice.I2CTransaction[2];
i2c[0]=I2CBus.CreateReadTransaction(bytRData);
i2c[1] = I2CBus.CreateWriteTransaction(bytWData);
I2CBus.Execute(i2c, 100); //執行
Debug.Print("I2C : " + bytRData[0].ToString() + " " + bytRData[1].ToString() + " " + bytRData[2].ToString() + " " + bytRData[3].ToString() + " " + bytRData[4].ToString() + " " + bytRData[5].ToString() + " " + bytRData[6].ToString() + " " + bytRData[7].ToString());
//---------------------------------------
if (++intNum > 7) intNum = 0;
Thread.Sleep(800);
}
}
public static Int16 ReadWriteAD(Int16 value)
{
byte[] bout = new byte[2];
byte[] bin = new byte[2];
bout[0] = (byte)(value >> 8);
bout[1] = (byte)(value & 0xff);
_spi.WriteRead(bout, bin);
Int16 aw0=(Int16)((bin[0] << 8) + bin[1]);
return aw0;
}
}
好了，模擬器的工作暫時告一個段落，有時間把該模擬器完善一下，給感興趣的網友共享，這樣就不用購買硬件就可以測試一些有意思的代碼和功能了（一個測試板卡要好幾百美元呢!）。
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