C# wince 蜂鸣器 发声 C#调用设备驱动函数
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;
}
}
}