cdclinecoding.c

AT91SAM9263的USB Device端口驱动

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/*
    Title: CDCLineCoding

    About: Purpose
        Implementation of the CDCLineCoding class.
*/

//------------------------------------------------------------------------------
//         Headers
//------------------------------------------------------------------------------

#include "CDCLineCoding.h"
#include <utility/assert.h>

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------
/*
    Function: CDCLineCoding_Initialize
        Initializes the bitrate, number of stop bits, parity checking and
        number of data bits of a CDCLineCoding object.

    Parameters:
        lineCoding - Pointer to a CDCLineCoding instance.
        bitrate - Bitrate of the virtual COM connection.
        stopbits - Number of stop bits (see <Stop bits>).
        parity - Parity check type (see <Parity checking>).
        databits - Number of data bits.
*/
void CDCLineCoding_Initialize(CDCLineCoding *lineCoding,
                              unsigned int bitrate,
                              unsigned char stopbits,
                              unsigned char parity,
                              unsigned char databits)
{
    ASSERT(stopbits <= CDCLineCoding_TWOSTOPBITS,
           "CDCLineCoding_Initialize: Invalid stopbits value (%d)\n\r",
           stopbits);
    ASSERT(parity <= CDCLineCoding_SPACEPARITY,
           "CDCLineCoding_Initialize: Invalid parity value (%d)\n\r",
           parity);
    ASSERT(((databits >= 5) && (databits <= 8)) || (databits == 16),
           "CDCLineCoding_Initialize: Invalid databits value (%d)\n\r",
           databits);

    lineCoding->dwDTERate = bitrate;
    lineCoding->bCharFormat = stopbits;
    lineCoding->bParityType = parity;
    lineCoding->bDataBits = databits;
}