C# wince 蜂鸣器 发声 C#调用设备驱动函数

作者：LoongEmbedded

转自：/article/1440901.html

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Runtime.InteropServices;

using System.Threading;

namespace createfile

{

unsafe public partial class Form1 : Form

{

const UInt32 OPEN_EXISTING = 3;

const UInt32 GENERIC_READ = 0x80000000;

const UInt32 GENERIC_WRITE = 0x40000000;

const Int32 INVALID_HANDLE_VALUE = -1;

private IntPtr hPort;

// PWM的控制字，来源TQ2440/Src/Drivers/PWMDriver/PWMDriver.h文件

const UInt32 IOCTL_PWM_SET_PRESCALER = 1;

const UInt32 IOCTL_PWM_SET_DIVIDER = 2;

const UInt32 IOCTL_PWM_START = 3;

const UInt32 IOCTL_PWM_GET_FREQUENCY = 4;

[DllImport("coredll.dll")]

public static extern IntPtr CreateFile(

String lpFileName,

UInt32 dwDesiredAccess,

UInt32 dwShareMode,

IntPtr lpSecurityAttributes,

UInt32 dwCreationDisposition,

UInt32 dwFlagsAndAttributes,

IntPtr hTemplateFile

);

[DllImport("coredll.dll")]

public static extern bool DeviceIoControl(

IntPtr hDevice,

UInt32 dwIoControlCode,

UInt32[] lpInBuffer,

UInt32 nInBufferSize,

Byte[] lpOutBuffer,

UInt32 nOutBufferSize,

UInt32 lpBytesReturned,

IntPtr lpOverlapped

);

public Form1()

{

InitializeComponent();

hPort = CreateFile("PWM1:", GENERIC_READ | GENERIC_WRITE, 0, IntPtr.Zero, OPEN_EXISTING, 0,

IntPtr.Zero);

if (hPort == (IntPtr)INVALID_HANDLE_VALUE)

{

MessageBox.Show("Open PWM Driver Fail");

}

}

private void button1_Click(object sender, EventArgs e)

{

UInt32[] buff = new UInt32[3] { 0, 488, 244 };//488,244来源

/*int freq = 800; // 工作频率初值

#define S3C2440_PCLK 50000000 // PCLK是50MHz

#define Prescaler0 15 // 预分频

#define MUX0 8 // 定时器分频值

#define TCNTB0 (S3C2440_PCLK/128/freq) // 工作频率

#define TCMPB0 (TCNTB0>>1) // 占空比，默认是50%

BYTE prescale[2] = {0, Prescaler0};

BYTE divider[2] = {0, MUX0};

DWORD buff[3] = {0, TCNTB0, TCMPB0};*/

UInt32[] prescale = new UInt32[2] { 0, 15 };

UInt32[] divider = new UInt32[2] { 0, 8 };

//初始化硬件

DeviceIoControl(hPort, IOCTL_PWM_SET_PRESCALER, prescale, 2, null, 0, 0, IntPtr.Zero);

DeviceIoControl(hPort, IOCTL_PWM_SET_DIVIDER, divider, 2, null, 0, 0, IntPtr.Zero);

//DeviceIoControl(hPort, IOCTL_PWM_START, buff, 3, null, 0, 0, IntPtr.Zero);

Thread t = new Thread(hh);

button2.Enabled = false;

timer1.Enabled = true;

t.Start();

while (button2.Enabled == false) ;

t.Abort();

}

public void hh()

{

UInt32[] buff = new UInt32[3] { 0, 488, 244 };//488,244来源

DeviceIoControl(hPort, IOCTL_PWM_START, buff, 3, null, 0, 0, IntPtr.Zero);

}

private void timer1_Tick(object sender, EventArgs e)

{

button2.Enabled = true;

}

}

}