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;

        }

    }

}