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eVC - EIOTest.exe (BitsyPlus EIO: Driver sample)

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ctacke

877 Posts

Posted - 26 Feb 2003 : 15:13:19

EIOTest.exe

EIOTest.exe demonstrates the use of the Extended IO (EIO) WinCE Port of the ADS BitsyPlus.

The EIO can be controlled bitwise, each having a state (1=high, 0=low) and a direction (1=output, 0=input). EIOTest opens the port, sets half of the bits as inputs, half as outputs, then writes a test pattern across all lines.

EIO Read/Write Tests

EIOWriteTest and EIOReadTest are useful for testing the digital I/Os without a display. EIOWriteTest runs a walking-ones test on the EIOn outputs and reports stuck bits, while EIOReadTest simply reads from the ports. Both display output on the debug port.

Sample output from EIOWriteTest:

EIOWriteTest 720020-11561:
Runs walking-ones test on EIO outputs.
Bit #:  9 8 7 6 5 4 3 2 1 0
    /   0 0 0 0 0 0 0 0 1 0  (out=0x002)

Key APIs Used

CreateFile
WriteFile
ReadFile
DeviceIoControl

Lines of Code: 239

Source Download
EIOTest, Rev. 1 - 26feb03 (14k zip)
EIOReadTest, Rev. 1 - 28aug03 (52k zip)
EIOWriteTest, Rev. 1 - 29aug03 (14k zip)

modified March 31, 02 (ctacke) - added key APIs and LOC
Edited by akidder 29-Aug-2003: Add EIOReadTest and EIOWriteTest.

akidder

1519 Posts

Posted - 11 Mar 2003 : 13:59:23

Here's a quick overview of how to use the EIO1: driver (set/get the direction mask, read/write port):


// Open the driver
  HANDLE hEIO = CreateFile( TEXT("EIO1:"), 
                            GENERIC_READ | GENERIC_WRITE, 
                            FILE_SHARE_READ,
                            NULL, 
                            OPEN_EXISTING, 
                            FILE_ATTRIBUTE_NORMAL, 
                            NULL);
//
// Set direction mask so bits 0-3 are outputs, others are inputs
//
  DWORD NumberOfBytes;
  DWORD mask = 0x000F;
  DeviceIoControl ( hEIO, 
                    IOCTL_EIO_CONFIG_PORTS,
                    &mask, 
                    sizeof(DWORD), 
                    NULL, 
                    0, 
                    &NumberOfBytes, 
                    NULL );
//
// Read the direction mask currently set
//
  DeviceIoControl ( hEIO, 
                    IOCTL_EIO_READ_CONFIG,
                    NULL,
                    0,
                    &mask,
                    sizeof(DWORD), 
                    &NumberOfBytes, 
                    NULL );
//
// Write to the port
//
  DWORD state = 0x0000; // all off
  WriteFile(hEIO, &state, sizeof(DWORD), &NumberOfBytes, NULL))
//
//
// Read from the port
//
  ReadFile(hEIO, state, sizeof(DWORD), &NumberOfBytes, NULL))