[飞凌嵌入式 ] 飞凌嵌入式OK335 xD Win CE学习之使用IIC

只看该作者 · 2014-10-7 14:24

本帖最后由多拉A梦喜欢你于 2014-10-7 14:55 编辑

前几天购买了一套飞凌公司的OK335xD开发板，开发板到手后，首先按照手册做了一遍，整体感觉还可以，出厂默认系统是Linux，由于我一直做ce，而且飞凌公司已经发布了ce6.0的bsp包于是我就下载了一份。貌似飞凌的335x系列开发板已经全部都支持ce6.0了，这在国内只此一家，不信可以上淘宝。真心佩服飞凌的实力。好了废话不多说了，TI的335x芯片号称是史上资料最全的芯片但是网上搜索335的wince资料是真心的少啊，少的可怜，为了方便后人我就把我新作的iic的程序和心得写出来。
IIC的通信原理我就不说了，网上搜索有很多的。我使用的是飞凌公司的OK335xD开发板，IIC芯片为AT24C02，大小是256字节。由于飞凌底板上没有24c02芯片所以我还需要自己亲自动手焊接一个。

                        原理图

一开始我以为原理图画好了，飞凌bsp里面有自带的IIC驱动，我就直接写应用程序就可以了，但是程序写好后，iic始终打不开，难道是驱动没有加载，但是我看了OK335xD的原理图音频芯片也使用了iic通信，为什么音频能使用我的iic设备打不开呢。最后上网查资料，我去原来我需要修改pinmux文件这就是TI和三星的最大的不同了，三星的东西是都在寄存器里面设置好的，然后把各个iic的驱动都一一加载上，但是TI的东西需要先配置引脚如下：
#define I2C2_PADS \
PAD_ENTRY(SPI0_SCLK,  (MODE(2) | RXACTIVE | PULLUDEN | SLEWCTRL)) /* I2C_DATA */  \
PAD_ENTRY(SPI0_D0, (MODE(2) | RXACTIVE | PULLUDEN | SLEWCTRL)) /* I2C_SCLK */  \
配置好引脚后开始做应用程序，应用程序界面如下所示：

测试程序代码如下：
// Forlinx_IICDlg.cpp : 实现文件
//

#include "stdafx.h"
#include "Forlinx_IIC.h"
#include "Forlinx_IICDlg.h"
#include "i2cproxy.h"
#include "sdk_i2c.h"
#include "winioctl.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

#define FILE_DEVICE_UNKNOWN 0x00000022
#define METHOD_BUFFERED 0
#define FILE_ANY_ACCESS 0

//------------------------------------------------------------------------------

#define IOCTL_I2C_SET_SLAVE_ADDRESS    \
CTL_CODE(FILE_DEVICE_UNKNOWN, 0x0200, METHOD_BUFFERED, FILE_ANY_ACCESS)

//------------------------------------------------------------------------------

#define IOCTL_I2C_SET_SUBADDRESS_MODE    \
CTL_CODE(FILE_DEVICE_UNKNOWN, 0x0201, METHOD_BUFFERED, FILE_ANY_ACCESS)

//------------------------------------------------------------------------------

#define IOCTL_I2C_SET_BAUD_INDEX    \
CTL_CODE(FILE_DEVICE_UNKNOWN, 0x0202, METHOD_BUFFERED, FILE_ANY_ACCESS)

#define  PAGE_SIZE 8
#define  SLAVEADDR 0x0

HANDLE IICFILE;
// CForlinx_IICDlg 对话框

CForlinx_IICDlg::CForlinx_IICDlg(CWnd* pParent /*=NULL*/)
      : CDialog(CForlinx_IICDlg::IDD, pParent)
{
      m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CForlinx_IICDlg::DoDataExchange(CDataExchange* pDX)
{
      CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CForlinx_IICDlg, CDialog)
#if defined(_DEVICE_RESOLUTION_AWARE) && !defined(WIN32_PLATFORM_WFSP)
      ON_WM_SIZE()
#endif
      //}}AFX_MSG_MAP
      ON_BN_CLICKED(IDC_BUTTON1, &CForlinx_IICDlg::OnBnClickedButton1)
      ON_BN_CLICKED(IDC_BUTTON2, &CForlinx_IICDlg::OnBnClickedButton2)
      ON_BN_CLICKED(IDC_BUTTON3, &CForlinx_IICDlg::OnBnClickedButton3)
      ON_BN_CLICKED(IDC_BUTTON4, &CForlinx_IICDlg::OnBnClickedButton4)
END_MESSAGE_MAP()

// CForlinx_IICDlg 消息处理程序

BOOL CForlinx_IICDlg::OnInitDialog()
{
      CDialog::OnInitDialog();

      // 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动
      //  执行此操作
      SetIcon(m_hIcon, TRUE);                      // 设置大图标
      SetIcon(m_hIcon, FALSE);             // 设置小图标

      // TODO: 在此添加额外的初始化代码

      return TRUE;  // 除非将焦点设置到控件，否则返回 TRUE
}

#if defined(_DEVICE_RESOLUTION_AWARE) && !defined(WIN32_PLATFORM_WFSP)
void CForlinx_IICDlg::OnSize(UINT /*nType*/, int /*cx*/, int /*cy*/)
{
      if (AfxIsDRAEnabled())
      {
            DRA::RelayoutDialog(
                     AfxGetResourceHandle(),
                     this->m_hWnd,
                     DRA::GetDisplayMode() != DRA::Portrait ?
                     MAKEINTRESOURCE(IDD_FORLINX_IIC_DIALOG_WIDE) :
                     MAKEINTRESOURCE(IDD_FORLINX_IIC_DIALOG));
      }
}
#endif

void CForlinx_IICDlg::OnBnClickedButton1()
{
      // TODO: 在此添加控件通知处理程序代码
         BOOL ret;
DWORD dwSlaveAddr = SLAVEADDR;
DWORD dwSubAddrMode = I2C_SUBADDRESS_MODE_8;
DWORD dwBaud = 1;
// 打开iic驱动 IICFILE
IICFILE = CreateFile(TEXT("I2C3:"), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, 0);
if (IICFILE == INVALID_HANDLE_VALUE)
{
      RETAILMSG(1,(_T("FORLINX: OPEN I2C3 Failed \r\n")));
      return;
}
else {
      RETAILMSG(1,(_T("FORLINX: OPEN I2C3 Sucessed \r\n")));
}

ret = DeviceIoControl(IICFILE,IOCTL_I2C_SET_SLAVE_ADDRESS,&dwSlaveAddr,0,NULL,0,NULL,NULL);
if(!ret) {
      RETAILMSG(1,(_T("FORLINX: OPEN IOCTL_I2C_SET_SLAVE_ADDRESS Failed \r\n")));
      return ;
}

ret = DeviceIoControl(IICFILE,IOCTL_I2C_SET_SUBADDRESS_MODE,&dwSubAddrMode,0,NULL,0,NULL,NULL);
if(!ret) {
RETAILMSG(1,(_T("FORLINX: OPEN IOCTL_I2C_SET_SUBADDRESS_MODE Failed \r\n")));
      return ;
}

ret = DeviceIoControl(IICFILE,IOCTL_I2C_SET_BAUD_INDEX,&dwBaud,0,NULL,0,NULL,NULL);
if(!ret) {
RETAILMSG(1,(_T("FORLINX: OPEN IOCTL_I2C_SET_BAUD_INDEX Failed \r\n")));
      return ;
}
RETAILMSG(1,(_T("FORLINX: OPEN Sucessed \r\n")));
}

void CForlinx_IICDlg::OnBnClickedButton2()
{
      // TODO: 在此添加控件通知处理程序代码
         if (IICFILE != INVALID_HANDLE_VALUE)
{
      CloseHandle(IICFILE);
      IICFILE = INVALID_HANDLE_VALUE;
}
}

BOOL WriteData(HANDLE hI2C,UINT8 offset, UINT32 *psendbuff, USHORT len)
{
// BOOL    ret ;
DWORD  bRet;
UINT32 ulAlign,ulWriteLen,ulWritedNum;
DWORD writelen;    //成功写入的长度
DWORD I2c_addr = SLAVEADDR;
ulWritedNum = 0;                                                    /* 初始化已经写入的个数为0    */

if((offset + len) > 256){                                           /* 写入的有效性             */
      return -1;
}
while(1){
      if(len > 0){
         ulAlign = offset % PAGE_SIZE;                      /* 计算要写入的地址是否页对齐  */
         if (ulAlign == 0) {
            if (len > PAGE_SIZE) {                         /* 如果长度大于1页          */
                  ulWriteLen = PAGE_SIZE;
            }
            else {
                  ulWriteLen = len;
            }
         }else {
            if(len > (PAGE_SIZE - ulAlign)) {
                  ulWriteLen = PAGE_SIZE - ulAlign;
            }else {
                  ulWriteLen = len;
            }
         }


         bRet = DeviceIoControl(hI2C,IOCTL_I2C_SET_SLAVE_ADDRESS,&I2c_addr,0,NULL,0,NULL,NULL);
         if(!bRet) {
            RETAILMSG(1,(_T("AT24C02-WriteData :IOCTL_I2C_SET_SLAVE_ADDRESS Failed .....................\r\n")));
            return FALSE;
         }
         bRet = SetFilePointer(hI2C,(BYTE)offset,NULL,FILE_BEGIN);
         //bRet = DeviceIoControl(hI2C,IOCTL_I2C_SET_SUBADDRESS,&offset,0,NULL,0,NULL,NULL);
         if(!bRet) {
            RETAILMSG(1,(_T("AT24C02-WriteData :SetFilePointer Failed .....................\r\n")));
            return FALSE;
         }

         bRet = WriteFile(hI2C,psendbuff,ulWriteLen,&writelen,NULL);
         if(writelen!=ulWriteLen) {
            RETAILMSG(1,(_T("AT24C02-WriteData :Write Data Failed ..................... bRet = %d  writelen = %d\r\n"),bRet,writelen));
            return FALSE;
         }
         Sleep(10);                                           /* 延时10ms                   */

         offset    +=  ulWriteLen;
         ulWritedNum  +=  ulWriteLen;
         len       -=  ulWriteLen;
         psendbuff += ulWriteLen;
      }else{
         break;
      }
}
return TRUE;

}

void CForlinx_IICDlg::OnBnClickedButton3()
{
      // TODO: 在此添加控件通知处理程序代码
      DWORD  bRet;
DWORD offset = 0;
DWORD I2c_addr = SLAVEADDR;
UINT32 prcvbuff;
DWORD dwLength = 32;
DWORD dwLengthRcv;
CString str;

bRet = DeviceIoControl(IICFILE,IOCTL_I2C_SET_SLAVE_ADDRESS,&I2c_addr,0,NULL,0,NULL,NULL);
if(!bRet) {
      RETAILMSG(1,(_T("AT24C02-WriteData :IOCTL_I2C_SET_SLAVE_ADDRESS Failed .....................\r\n")));
      return ;
}
bRet = SetFilePointer(IICFILE,(BYTE)offset,NULL,FILE_BEGIN);
//bRet = DeviceIoControl(IICFILE,IOCTL_I2C_SET_SUBADDRESS,&offset,0,NULL,0,NULL,NULL);
if(!bRet) {
      RETAILMSG(1,(_T("AT24C02-WriteData :SetFilePointer Failed .....................\r\n")));
      return ;
}

      ReadFile(IICFILE, &prcvbuff, dwLength, &dwLengthRcv, NULL);
      RETAILMSG(1,(_T("prcvbuff =")));
// for (i=0;i<255;i++)
// {
// RETAILMSG(1,(_T(" %d"),prcvbuff));
// }
      str.Format(_T("%d"),prcvbuff);
GetDlgItem(IDC_EDIT1)->SetWindowText(str);
         RETAILMSG(1,(_T("\r\n dwLengthRcv = %d"),dwLengthRcv));
}

void CForlinx_IICDlg::OnBnClickedButton4()
{
      // TODO: 在此添加控件通知处理程序代码
      //  UCHAR psendbuff[32];
  //  int i;
  //  for (i=0;i<255;i++)
  //  {
// psendbuff = i;
  //  }
      UINT32 pInBuffer = 0x00;
      pInBuffer = GetDlgItemInt(IDC_EDIT2);

WriteData(IICFILE,0,&pInBuffer,32);
}