296 lines
6.2 KiB
C++
296 lines
6.2 KiB
C++
#include "Kernel\Sys.h"
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#include "Kernel\Task.h"
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#include "SerialPort.h"
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#define COM_DEBUG 0
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SerialPort::SerialPort() { Init(); }
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SerialPort::SerialPort(COM index, int baudRate)
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{
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Init();
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Set(index, baudRate);
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}
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// 析构时自动关闭
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SerialPort::~SerialPort()
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{
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delete RS485;
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RS485 = nullptr;
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delete Ports[0];
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Ports[0] = nullptr;
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delete Ports[1];
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Ports[1] = nullptr;
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}
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void SerialPort::Init()
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{
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Index = COM_NONE;
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RS485 = nullptr;
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Error = 0;
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State = nullptr;
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Remap = 0;
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MinSize = 1;
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Pins[0] = Pins[1] = P0;
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Ports[0] = Ports[1] = nullptr;
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_dataBits = 8;
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_parity = 0;
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_stopBits = 1;
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_taskidRx = 0;
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OnInit();
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}
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void SerialPort::Set(COM index, int baudRate)
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{
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Index = index;
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_baudRate = baudRate;
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// 计算字节间隔。字节速度一般是波特率转为字节后再除以2
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//ByteTime = 15000000 / baudRate; // (1000000 /(baudRate/10)) * 1.5
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//ByteTime = 1000000 / (baudRate >> 3 >> 1);
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//ByteTime <<= 1;
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if(baudRate > 9600)
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ByteTime = 1;
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else
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ByteTime = 1000 / (baudRate / 10) + 1; // 小数部分忽略，直接加一
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// 设置名称
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Buffer(Name, 4) = "COMx";
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Name[3] = '0' + Index + 1;
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Name[4] = 0;
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// 根据端口实际情况决定打开状态
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if(OnSet()) Opened = true;
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}
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void SerialPort::Set(byte dataBits, byte parity, byte stopBits)
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{
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_dataBits = dataBits;
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_parity = parity;
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_stopBits = stopBits;
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}
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// 打开串口
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bool SerialPort::OnOpen()
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{
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// 清空缓冲区
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if(Tx.Capacity() == 0) Tx.SetCapacity(256);
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if(Rx.Capacity() == 0) Rx.SetCapacity(256);
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Tx.Clear();
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Rx.Clear();
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debug_printf("Serial%d::Open(%d, %d, %d, %d) TX=P%c%d RX=P%c%d Cache(TX=%d, RX=%d)\r\n", Index + 1, _baudRate, _dataBits, _parity, _stopBits, _PIN_NAME(Pins[0]), _PIN_NAME(Pins[1]), Tx.Capacity(), Rx.Capacity());
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OnOpen2();
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Set485(false);
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return true;
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}
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// 关闭端口
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void SerialPort::OnClose()
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{
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debug_printf("~Serial%d Close\r\n", Index + 1);
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OnClose2();
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}
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// 向某个端口写入数据。如果size为0，则把data当作字符串，一直发送直到遇到\0为止
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bool SerialPort::OnWrite(const Buffer& bs)
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{
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if(!Opened || !bs.Length()) return true;
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/*#if defined(STM32F0) || defined(GD32F150)
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Set485(true);
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// 中断发送过于频繁，影响了接收中断，采用循环阻塞发送。后面考虑独立发送任务
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for(int i=0; i<bs.Length(); i++)
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{
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SendData(bs[i], 3000);
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}
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Set485(false);
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#else*/
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// 如果队列已满，则强制刷出
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//if(Tx.Length() + bs.Length() > Tx.Capacity()) Flush(Sys.Clock / 40000);
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Tx.Write(bs);
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// 打开串口发送
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Set485(true);
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//USART_ITConfig((USART_TypeDef*)State, USART_IT_TXE, ENABLE);
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OnWrite2();
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//#endif
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return true;
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}
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// 刷出某个端口中的数据
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bool SerialPort::Flush(uint times)
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{
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// 打开串口发送
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Set485(true);
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while(!Tx.Empty() && times > 0) times = SendData(Tx.Dequeue(), times);
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Set485(false);
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return times > 0;
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}
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// 从某个端口读取数据
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uint SerialPort::OnRead(Buffer& bs)
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{
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int count = 0;
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int len = Rx.Length();
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// 如果没有数据，立刻返回，不要等待浪费时间
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if(!len)
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{
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bs.SetLength(0);
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return 0;
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}
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// 如果有数据变化，等一会
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while(len != count && len < bs.Length())
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{
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count = len;
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// 按照115200波特率计算，传输7200字节每秒，每个毫秒7个字节，大概150微秒差不多可以接收一个新字节
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Sys.Sleep(ByteTime);
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//Sys.Sleep(2);
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len = Rx.Length();
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}
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// 如果数据大小不足，等下次吧
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if(len < MinSize)
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{
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bs.SetLength(0);
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return 0;
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}
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// 从接收队列读取
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count = Rx.Read(bs);
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bs.SetLength(count);
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// 如果还有数据，打开任务
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if(!Rx.Empty()) Sys.SetTask(_taskidRx, true, 0);
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return count;
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}
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void SerialPort::ReceiveTask()
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{
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auto sp = this;
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//!!! 只要注释这一行，四位触摸开关就不会有串口溢出错误
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if(sp->Rx.Length() == 0) return;
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// 从栈分配，节省内存
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byte buf[0x200];
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Buffer bs(buf, ArrayLength(buf));
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int mx = sp->MaxSize;
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if(mx > 0 && mx > bs.Length()) bs.SetLength(mx);
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uint len = sp->Read(bs);
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if(len)
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{
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len = sp->OnReceive(bs, nullptr);
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// 如果有数据，则反馈回去
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if(len) sp->Write(bs);
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}
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}
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void SerialPort::SetBaudRate(int baudRate)
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{
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Set((COM)Index, baudRate);
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}
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void SerialPort::ChangePower(int level)
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{
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// 串口进入低功耗时，直接关闭
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if(level) Close();
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}
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void SerialPort::Register(TransportHandler handler, void* param)
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{
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ITransport::Register(handler, param);
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if(handler)
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{
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// 建立一个未启用的任务，用于定时触发接收数据，收到数据时开启
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if(!_taskidRx)
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{
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//_taskidRx = Sys.AddTask([](void* p){ ((SerialPort*)p)->ReceiveTask(); }, this, -1, -1, "串口接收");
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_taskidRx = Sys.AddTask(&SerialPort::ReceiveTask, this, -1, -1, "串口接收");
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auto tsk = Task::Get(_taskidRx);
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// 串口任务深度设为2，允许重入，解决接收任务内部调用发送然后又等待接收匹配的问题
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//tsk->MaxDeepth = 2;
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_task = tsk;
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}
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/*#if defined(STM32F0) || defined(GD32F150)
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// 打开中断
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byte irq = uart_irqs[Index];
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Interrupt.SetPriority(irq, 0);
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Interrupt.Activate(irq, OnHandler, this);
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#endif*/
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}
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else
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{
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Sys.RemoveTask(_taskidRx);
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}
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}
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extern "C"
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{
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static SerialPort* _printf_sp;
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static bool isInFPutc;
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}
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SerialPort* SerialPort::GetMessagePort()
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{
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auto sp = _printf_sp;
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// 支持中途改变调试口
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if(sp && Sys.MessagePort != sp->Index)
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{
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delete sp;
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_printf_sp = nullptr;
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}
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if(!sp)
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{
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auto idx = (COM)Sys.MessagePort;
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if(idx == COM_NONE) return nullptr;
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if(isInFPutc) return nullptr;
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isInFPutc = true;
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// 打开日志输出口，需要较大发送缓冲区
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sp = _printf_sp = new SerialPort(idx);
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sp->Tx.SetCapacity(512);
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sp->Open();
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isInFPutc = false;
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}
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return sp;
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}
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void SerialPort::Set485(bool flag)
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{
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if(RS485)
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{
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if(!flag) Sys.Sleep(1);
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*RS485 = flag;
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if(flag) Sys.Sleep(1);
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/*if(flag)
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debug_printf("485 高\r\n");
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else
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debug_printf("485 低\r\n");*/
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}
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}
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