PVD(Physical Virtual Device) :绝对值鼠标设计 DF创客社区

zoologist 发表于 2025-1-7 19:05:58

PVD(Physical Virtual Device) :绝对值鼠标设计

我们通常使用的鼠标发送的都是相对坐标，比如：输出X=100,Y=200，意思是通知系统将鼠标从目前的位置移动(100,200)个单位。此外，Windows 还有一个鼠标优化机制，比如，你的鼠标输出范围是 +/- 127, 如果你的屏幕宽度是 1920，经过优化之后无需滑动 1920/127 次才能将鼠标指针从最左边移动到最右边。这次带来的PVD(Physical Virtual Device)是一款绝对值鼠标，它模拟了一个绝对值鼠标，能够将从USB串口输入的数据转化为绝对值鼠标数据发送出来。这样，可以方便的实现鼠标点击屏幕上的任意位置。硬件部分使用和上一次设计相同【参考1】，核心是 WCH出品的 CH554e单片机。代码是Arduino 来实现的，屏幕左上角是(0,0), 输出坐标为 0-32767。实践表明：送出来的数据和屏幕分辨率存在定比例关系。比如，在1920*1024屏幕上，如果想让鼠标移动到(300, 200)的位置，那么需要设备输出(300/1920*32768, 200/1024 *32768)这样的数据。主程序代码如下：#ifndef USER_USB_RAM
#error "This example needs to be compiled with a USER USB setting"
#endif

#include <WS2812.h>
#include "src/CdcHidCombo/USBCDC.h"
#include "src/CdcHidCombo/USBHIDKeyboardMouse.h"

#define NUM_LEDS 1
#define COLOR_PER_LEDS 3
#define NUM_BYTES (NUM_LEDS*COLOR_PER_LEDS)

__xdata uint8_t ledData;

#defineKeyboardReportID0x01
#definerMouseReportID 0x02
#defineaMouseReportID 0x03
#defineOnBoardLED    0x04

// Data format
// Keyboard(Total 9 bytes)： 01(ReportID 01) + Keyboard data (8 Bytes)
// Mouse(Total 5 bytes)： 02(ReportID 02) + Mouse Data (4 Bytes)
uint8_t recvStr;
uint8_t recvStrPtr = 0;
unsigned long Elsp;

void setup() {
USBInit();
Serial0_begin(115200);
delay(1000);
Serial0_print("start");
Elsp=0;
}

void loop() {
while (USBSerial_available()) {
uint8_t serialChar = USBSerial_read();
recvStr = serialChar;
if (recvStrPtr == 10) {
   for (uint8_t i = 0; i < 9; i++) {
   Serial0_write(recvStr);
   }
   if (recvStr == KeyboardReportID) { // Keyboard
   USB_EP3_send(recvStr, 9);
   }
   if (recvStr == rMouseReportID) {
   USB_EP3_send(recvStr, 5); // Relative Mouse
   }
   if (recvStr == aMouseReportID) {
   USB_EP3_send(recvStr, 7); // Absolute Mouse
   }
   if (recvStr == OnBoardLED) {
   set_pixel_for_GRB_LED(ledData, 0, recvStr, recvStr, recvStr);
   neopixel_show_P1_5(ledData, NUM_BYTES);
   }

   recvStrPtr = 0;
}
Elsp=millis();
}
// If there is no data in 100ms, clear the receive buffer
if (millis()-Elsp>100) {
   recvStrPtr = 0;
   Elsp=millis();
}
}
如果USB CDC 收到以 aMouseReportID起始的9个字节，那么会将数据直接转到绝对值鼠标端点然后发送给主机。VS2019 编写一个上位机程序进行测试，代码如下：// CDC_vKBMSTest.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <windows.h>
#include <SetupAPI.h>
#include <tchar.h>
#include <iostream>
#include <cstring>
#include <atlstr.h>

#pragma comment(lib, "Setupapi.lib")

#define MY_USB_PID_VID    _T("VID_1209&PID_C55C")
#define SCREENWIDTH 1920
#define SCREENHEIGHT 1200
int Port;

class ComPortException : public std::exception {
public:
   ComPortException(DWORD errorCode) : errorCode(errorCode) {}

   DWORD getErrorCode() const {
            return errorCode;
   }

private:
   DWORD errorCode;
};

// 对串口portName 发送数据
// 无法打开串口返回 1
// 无法设置串口参数 2
void SendToComPort(const int port, const char* data) {
   int Result = 0;
   HANDLE hCom = INVALID_HANDLE_VALUE;
   TCHAR portName; // 用于存储 "COMp" 字符串

// 将整数 p 转换为 "COMp" 字符串
#ifdef UNICODE
   swprintf(portName, 10, _T("\\\\.\\COM%d"), port);
#else
   sprintf(portName, "COM%d", port);
#endif
   try {
            // 打开串口
            hCom = CreateFile(portName,
                     GENERIC_READ | GENERIC_WRITE,
                     0,
                     NULL,
                     OPEN_EXISTING,
                     0,
                     NULL);

            if (hCom == INVALID_HANDLE_VALUE) {
                     throw ComPortException(GetLastError());
            }

            // 设置串口参数
            DCB dcb;
            SecureZeroMemory(&dcb, sizeof(DCB));
            dcb.DCBlength = sizeof(DCB);

            if (!GetCommState(hCom, &dcb)) {
                     throw ComPortException(GetLastError());
            }

            dcb.BaudRate = CBR_115200;// 波特率
            dcb.ByteSize = 8;       // 数据位
            dcb.StopBits = ONESTOPBIT; // 停止位
            dcb.Parity = NOPARITY; // 校验位

            if (!SetCommState(hCom, &dcb)) {
                     throw ComPortException(GetLastError());
            }

            // 设置超时参数
            COMMTIMEOUTS timeouts;
            timeouts.ReadIntervalTimeout = 50;
            timeouts.ReadTotalTimeoutConstant = 50;
            timeouts.ReadTotalTimeoutMultiplier = 10;
            timeouts.WriteTotalTimeoutConstant = 50;
            timeouts.WriteTotalTimeoutMultiplier = 10;

            if (!SetCommTimeouts(hCom, &timeouts)) {
                     throw ComPortException(GetLastError());
            }

            // 发送数据
            DWORD bytesWritten;
            if (!WriteFile(hCom, data, 10, &bytesWritten, NULL)) {
                     std::cerr << "Failed to write to COM port." << std::endl;
            }
            else {
                     std::cout << "Successfully sent data to COM port: [" << port << "]" << std::endl;
            }

            for (int i = 0; i < 10; i++) {
                     printf("%02x ", data&0xFF);
            }
            printf("\n");
            // 关闭串口
            if (hCom != INVALID_HANDLE_VALUE) {
                     CloseHandle(hCom);
            }
   }
   catch (const ComPortException& ex) {
            std::cerr << "Error: " << ex.getErrorCode() << std::endl;
            if (hCom != INVALID_HANDLE_VALUE) {
                     CloseHandle(hCom);
            }
   }

}

/************************************************************************/
/* 根据USB描述信息字符串中读取
/************************************************************************/
int MTGetPortFromVidPid(CString strVidPid)
{
   // 获取当前系统所有使用的设备
   int                                     nPort = -1;
   int                                     nStart = -1;
   int                                     nEnd = -1;
   int                                     i = 0;
   CString                            strTemp, strName;
   DWORD                            dwFlag = (DIGCF_ALLCLASSES | DIGCF_PRESENT);
   HDEVINFO                      hDevInfo = INVALID_HANDLE_VALUE;
   SP_DEVINFO_DATA             sDevInfoData;
   TCHAR                            szDis = { 0x00 };// 存储设备实例ID
   TCHAR                            szFN = { 0x00 };// 存储设备实例属性
   DWORD                            nSize = 0;

   // 准备遍历所有设备查找USB
   hDevInfo = SetupDiGetClassDevs(NULL, L"USB", NULL, dwFlag);
   if (INVALID_HANDLE_VALUE == hDevInfo)
            goto STEP_END;

   // 开始遍历所有设备
   memset(&sDevInfoData, 0x00, sizeof(SP_DEVICE_INTERFACE_DATA));
   sDevInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
   for (i = 0; SetupDiEnumDeviceInfo(hDevInfo, i, &sDevInfoData); i++)
   {
            nSize = 0;

            // 无效设备
            if (!SetupDiGetDeviceInstanceId(hDevInfo, &sDevInfoData, szDis, sizeof(szDis), &nSize))
                     goto STEP_END;

            // 根据设备信息寻找VID PID一致的设备
            strTemp.Format(_T("%s"), szDis);
            strTemp.MakeUpper();
            if (strTemp.Find(strVidPid, 0) == -1)
                     continue;

            // 查找设备属性
            nSize = 0;
            SetupDiGetDeviceRegistryProperty(hDevInfo, &sDevInfoData,
                     SPDRP_FRIENDLYNAME,
                     0, (PBYTE)szFN,
                     sizeof(szFN),
                     &nSize);

            // "XXX Virtual Com Port (COM7)"
            strName.Format(_T("%s"), szFN);
            _tprintf(_T("%s"), szFN);
            if (strName.IsEmpty())
                     //goto STEP_END;
                     continue;

            // 寻找串口信息
            nStart = strName.Find(_T("(COM"), 0);
            nEnd = strName.Find(_T(")"), 0);
            if (nStart == -1 || nEnd == -1)
                     //goto STEP_END;
                     continue;

            strTemp = strName.Mid(nStart + 4, nEnd - nStart - 4);
            nPort = _ttoi(strTemp);

   }
STEP_END:

   // 关闭设备信息集句柄
   if (hDevInfo != INVALID_HANDLE_VALUE)
   {
            SetupDiDestroyDeviceInfoList(hDevInfo);
            hDevInfo = INVALID_HANDLE_VALUE;
   }

   return nPort;
}

int ScreenX2Abs(int X) {
   return (X* 32768 / SCREENWIDTH);
}
int ScreenY2Abs(int Y) {
   return (Y* 32768 / SCREENHEIGHT);
}

void ChangeColor(
   int X,
   int Y
) {
   char Data;

   memset(Data, 0, sizeof(Data));
   Data = 3; // 绝对值鼠标
   Data = 1; // 点击
   Data = ScreenX2Abs(X) & 0xFF;
   Data = (ScreenX2Abs(X) >> 8) & 0xFF;
   Data = ScreenY2Abs(Y) & 0xFF;
   Data = (ScreenY2Abs(Y) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);
   memset(Data, 0, sizeof(Data));
   Data = 3; // 绝对值鼠标
   Data = 0; // 点击
   Data = ScreenX2Abs(X) & 0xFF;
   Data = (ScreenX2Abs(X) >> 8) & 0xFF;
   Data = ScreenY2Abs(Y) & 0xFF;
   Data = (ScreenY2Abs(Y) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);
}

void LedColor(
   int Color
) {
   char Data;

   memset(Data, 0, sizeof(Data));
   Data = 4; // LED
   Data = Color&0xFF; // 点击
   Data = (Color>>8) & 0xFFF;
   Data = (Color >>16) & 0xFF;

   SendToComPort(Port, (char*)&Data);
}

void DrawRect(
   int StartX,
   int StartY,
   int Width,
   int Height,
   int Dx,
   int Dy
) {
   char Data;

   //从左到右横线
   //line(StartX, StartY, StartX + Width, StartY);
   memset(Data, 0, sizeof(Data));
   Data = 3; // 绝对值鼠标
   Data = 1; // 点击
   Data = ScreenX2Abs(StartX) & 0xFF;
   Data = (ScreenX2Abs(StartX) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY) & 0xFF;
   Data = (ScreenY2Abs(StartY) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);

   Data = 3; // 绝对值鼠标
   Data = 1; // 点击
   Data = ScreenX2Abs(StartX+Width) & 0xFF;
   Data = (ScreenX2Abs(StartX+Width) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY) & 0xFF;
   Data = (ScreenY2Abs(StartY) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);

   Data = 3; // 绝对值鼠标
   Data = 0; // 抬起
   Data = ScreenX2Abs(StartX + Width) & 0xFF;
   Data = (ScreenX2Abs(StartX + Width) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY) & 0xFF;
   Data = (ScreenY2Abs(StartY) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);

   //从上到下，竖线
   //line(StartX + Width, StartY,StartX+Width,StartY+Height);
   memset(Data, 0, sizeof(Data));
   Data = 3; // 绝对值鼠标
   Data = 1; // 点击
   Data = ScreenX2Abs(StartX+Width) & 0xFF;
   Data = (ScreenX2Abs(StartX + Width) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY) & 0xFF;
   Data = (ScreenY2Abs(StartY) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);

   Data = 3; // 绝对值鼠标
   Data = 1; // 点击
   Data = ScreenX2Abs(StartX + Width) & 0xFF;
   Data = (ScreenX2Abs(StartX + Width) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY+Height) & 0xFF;
   Data = (ScreenY2Abs(StartY+Height) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);

   Data = 3; // 绝对值鼠标
   Data = 0; // 抬起
   Data = ScreenX2Abs(StartX + Width) & 0xFF;
   Data = (ScreenX2Abs(StartX + Width) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY + Height) & 0xFF;
   Data = (ScreenY2Abs(StartY + Height) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);

   //从右到左，横线
   //line(StartX + Width, StartY + Height,StartX+Dx,StartY+Height);
   memset(Data, 0, sizeof(Data));
   Data = 3; // 绝对值鼠标
   Data = 1; // 点击
   Data = ScreenX2Abs(StartX + Width) & 0xFF;
   Data = (ScreenX2Abs(StartX + Width) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY+Height) & 0xFF;
   Data = (ScreenY2Abs(StartY+Height) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);

   Data = 3; // 绝对值鼠标
   Data = 1; // 点击
   Data = ScreenX2Abs(StartX + Dx) & 0xFF;
   Data = (ScreenX2Abs(StartX + Dx) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY + Height) & 0xFF;
   Data = (ScreenY2Abs(StartY + Height) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);

   Data = 3; // 绝对值鼠标
   Data = 0; // 抬起
   Data = ScreenX2Abs(StartX + Dx) & 0xFF;
   Data = (ScreenX2Abs(StartX + Dx) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY + Height) & 0xFF;
   Data = (ScreenY2Abs(StartY + Height) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);

   //从下到上竖线
   //line(StartX + Dx, StartY + Height, StartX + Dx, StartY + Dy);
   memset(Data, 0, sizeof(Data));
   Data = 3; // 绝对值鼠标
   Data = 1; // 点击
   Data = ScreenX2Abs(StartX + Dx) & 0xFF;
   Data = (ScreenX2Abs(StartX + Dx) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY + Height) & 0xFF;
   Data = (ScreenY2Abs(StartY + Height) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);

   Data = 3; // 绝对值鼠标
   Data = 1; // 点击
   Data = ScreenX2Abs(StartX + Dx) & 0xFF;
   Data = (ScreenX2Abs(StartX + Dx) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY + Dy) & 0xFF;
   Data = (ScreenY2Abs(StartY + Dy) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);

   Data = 3; // 绝对值鼠标
   Data = 0; // 抬起
   Data = ScreenX2Abs(StartX + Dx) & 0xFF;
   Data = (ScreenX2Abs(StartX + Dx) >> 8) & 0xFF;
   Data = ScreenY2Abs(StartY + Dy) & 0xFF;
   Data = (ScreenY2Abs(StartY + Dy) >> 8) & 0xFF;
   SendToComPort(Port, (char*)&Data);
   Sleep(100);
}

int main()
{

   printf("%d[%x]%d[%x]\n", ScreenX2Abs(100), ScreenX2Abs(100), ScreenY2Abs(300), ScreenY2Abs(300));
   printf("Virutal KB MS Test\n");
   Port = MTGetPortFromVidPid(MY_USB_PID_VID);
   if (Port == -1) {
            printf("No device is found\n");
            goto EndProgram;
   }
   else {
            printf("Found COM%d\n",Port);
   }
   Sleep(5000);
   for (int i = 0; i < 8; i++) {
            DrawRect(100+20*i, 300+20*i, SCREENWIDTH - 200-20*i*2, SCREENHEIGHT - 500-20*i*2, 20, 20);
            if ((i % 3) == 0) {
                     LedColor(0x01);
            }
            if ((i % 3) == 1) {
                     LedColor(0x0100);
            }
            if ((i % 3) == 2) {
                     LedColor(0x010000);
            }
   }

   ChangeColor(1329,125);
   for (int i = 8; i < 18; i++) {
            DrawRect(100 + 20 * i, 300 + 20 * i, SCREENWIDTH - 200 - 20 * i * 2, SCREENHEIGHT - 500 - 20 * i * 2, 20, 20);
            if ((i % 3) == 0) {
                     LedColor(0x01);
            }
            if ((i % 3) == 1) {
                     LedColor(0x0100);
            }
            if ((i % 3) == 2) {
                     LedColor(0x010000);
            }
   }

EndProgram:
   printf("End\n");
   getchar();
}
这个代码的作用是在画笔中绘制蛇形线，在绘制过程中还有更换颜色的动作。工作的视频：【PVD 计划：绝对值鼠标测试】https://www.bilibili.com/video/BV1JyrPY9EQo/?share_source=copy_web&vd_source=5ca375392c3dd819bfc37d4672cb6d54
参考：
1. https://mc.dfrobot.com.cn/thread-323494-1-1.html

zoologist 发表于 2025-1-7 19:07:54

本文提到的Arduino 代码：

页: [1]

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PVD(Physical Virtual Device) :绝对值鼠标设计