223 lines
4.4 KiB
C++
223 lines
4.4 KiB
C++
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#include "Port.h"
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#include "Sys.h"
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#define IIC1 0
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#define IIC2 1
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#define IIC3 2
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class I2C_SimPortPort
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{
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public:
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int Speed; // 速度 单位 bps/s 好像最高400k
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int Retry; // 等待重试次数，默认200
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int Error; // 错误次数
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ushort Address; // 7位地址或10位地址
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bool HasSecAddress; // 设备是否有子地址
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// 使用端口和最大速度初始化，因为需要分频，实际速度小于等于该速度
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I2C_SimPortPort(I2C_TypeDef* iic = I2C1, uint speedHz = 10000);
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virtual ~I2C_SimPortPort();
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void SetPin(Pin acl = P0, Pin sda = P0);
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void GetPin(Pin* acl = NULL, Pin* sda = NULL);
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void Open();
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void Close();
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void Write(byte id=0xffff, byte addr, byte * buf =NULL,int len=0x00);
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byte* Read(byte id=0xffff, byte addr, int len=0X00);
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private:
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byte _index; // IIC
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int _delay; // 根据速度匹配的延时
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Pin Pins[2];
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OutputPort* SCL;
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OutputPort* SDA;
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void Start();
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void Stop();
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void Ack();
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byte ReadData();
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bool WriteData(byte dat);
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bool SetID(byte id, bool tx = true);
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bool WaitForEvent(uint event);
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};
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I2C_SimPortPort::I2C_SimPortPort(byte iic , uint speedHz )
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{
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_index = iic;
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Pin pins[][2] = I2C_PINS;
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Pins[0] = pins[_index][0];
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Pins[1] = pins[_index][1];
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Speed = speedHz;
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_delay = Sys.Clock/speedHz;
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Retry = 200;
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Error = 0;
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Address = 0x00;
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}
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I2C_SimPortPort::~I2C_SimPortPort()
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{
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Close();
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}
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void I2C_SimPortPort::SetPin(Pin acl , Pin sda )
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{
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Pins[0] = acl;
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Pins[1] = sda;
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}
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void I2C_SimPortPort::GetPin(Pin* acl , Pin* sda )
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{
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*acl = Pins[0];
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*sda = Pins[1];
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}
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void I2C_SimPortPort::Open()
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{
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// gpio 复用开漏输出
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SCL = new OutputPort(Pins[0], false, true);
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SDA = new OutputPort(Pins[1], false, true);
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}
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void I2C_SimPortPort::Close()
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{
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if(SCL) delete SCL;
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SCL = NULL;
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if(SDA) delete SDA;
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SDA = NULL;
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}
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/*
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sda ----____
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scl ___-------____
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*/
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void I2C_SimPortPort::Start()
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{
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*SDA=1; //发送起始条件的数据信号
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__nop();
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__nop();
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__nop();
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*SCL=1; //起始条件建立时间大于4.7us,延时
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Sys.Delay(_delay);
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*SDA=0; //发送起始信号
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Sys.Delay(_delay);
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*SCL=0; //钳住I2C总线，准备发送或接收数据
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__nop();
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__nop();
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__nop();
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__nop();
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}
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/*
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sda ____----
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scl ___-------____
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*/
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void I2C_SimPortPort::Stop()
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{
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*SDA=0; //发送结束条件的数据信号
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//发送结束条件的时钟信号
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Sys.Delay(_delay);
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*SCL=1; //结束条件建立时间大于4μ
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Sys.Delay(_delay);
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*SDA=1; //发送I2C总线结束信号
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__nop();
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__nop();
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__nop();
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__nop();
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}
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void I2C_SimPortPort::Ack()
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{
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*SDA=0;
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__nop();
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__nop();
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__nop();
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__nop();
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__nop();
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*SCL=1; //时钟低电平周期大于4μ
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Sys.Delay(_delay);
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*SCL=0; //清时钟线，钳住I2C总线以便继续接收
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__nop();
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__nop();
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__nop();
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__nop();
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}
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byte I2C_SimPortPort::ReadData()
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{
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byte retc=0;
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*SDA=1; // 开
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for(int BitCnt=0;BitCnt<8;BitCnt++)
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{
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Sys.Delay(_delay/2);
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*SCL=0; // 置时钟线为低，准备接收数据位
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Sys.Delay(_delay);
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*SCL=1; // 置时钟线为高使数据线上数据有效
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Sys.Delay(_delay/2);
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retc=retc<<1;
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if(SDA->ReadInput()==1)retc=retc+1; //读数据位,接收的数据位放入retc中
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}
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Sys.Delay(_delay/2);
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*SCL=0;
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__nop();
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__nop();
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__nop();
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return(retc);
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}
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bool I2C_SimPortPort::WriteData(byte dat)
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{
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for(int BitCnt=0;BitCnt<8;BitCnt++) //要传送的数据长度为8位
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{
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if((c<<BitCnt)&0x80)SDA=1; //判断发送位
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else SDA=0;
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__nop();
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*SCL=1; //置时钟线为高，通知被控器开始接收数据位
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Sys.Delay(delay);
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*SCL=0;
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}
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Sys.Delay(delay/2);
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*SDA=1; //8位发送完后释放数据线，准备接收应答位
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__nop();
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__nop();
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__nop();
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__nop();
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__nop();
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*SCL=1;
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Sys.Delay(delay/2);
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if(SDA->ReadInput()==1)ack=0;
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else ack=1; //判断是否接收到应答信号
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SCL=0;
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__nop();
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__nop();
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__nop();
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__nop();
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}
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bool I2C_SimPortPort::SetID(byte id, bool write)
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{
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}
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void I2C_SimPortPort::Write(byte id, byte addr, byte * buf ,int len)
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{
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}
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