コード例 #1
0
ファイル: twid.c プロジェクト: NissankaW/Mariokart3
//------------------------------------------------------------------------------
/// Interrupt handler for a TWI peripheral. Manages asynchronous transfer
/// occuring on the bus. This function MUST be called by the interrupt service
/// routine of the TWI peripheral if asynchronous read/write are needed.
/// \param pTwid  Pointer to a Twid instance.
//------------------------------------------------------------------------------
void TWID_Handler(Twid *pTwid)
{
    unsigned char status;
    AsyncTwi *pTransfer = (AsyncTwi *) pTwid->pTransfer;
    AT91S_TWI *pTwi = pTwid->pTwi;

    SANITY_CHECK(pTwid);

    // Retrieve interrupt status
    status = TWI_GetMaskedStatus(pTwi);

    // Byte received
    if (TWI_STATUS_RXRDY(status)) {

        pTransfer->pData[pTransfer->transferred] = TWI_ReadByte(pTwi);
        pTransfer->transferred++;

        // Transfer finished ?
        if (pTransfer->transferred == pTransfer->num) {

            TWI_DisableIt(pTwi, AT91C_TWI_RXRDY);
            TWI_EnableIt(pTwi, AT91C_TWI_TXCOMP);
        }
        // Last byte ?
        else if (pTransfer->transferred == (pTransfer->num - 1)) {

            TWI_Stop(pTwi);
        }
    }
    // Byte sent
    else if (TWI_STATUS_TXRDY(status)) {

        // Transfer finished ?
        if (pTransfer->transferred == pTransfer->num) {

            TWI_DisableIt(pTwi, AT91C_TWI_TXRDY);
            TWI_EnableIt(pTwi, AT91C_TWI_TXCOMP);
            TWI_SendSTOPCondition(pTwi);
        }
        // Bytes remaining
        else {

            TWI_WriteByte(pTwi, pTransfer->pData[pTransfer->transferred]);
            pTransfer->transferred++;
        }
    }
    // Transfer complete
    else if (TWI_STATUS_TXCOMP(status)) {

        TWI_DisableIt(pTwi, AT91C_TWI_TXCOMP);
        pTransfer->status = 0;
        if (pTransfer->callback) {
            
            pTransfer->callback((Async *) pTransfer);
        }
        pTwid->pTransfer = 0;
    }
}
コード例 #2
0
ファイル: twid.c プロジェクト: copterpilot/bricklib
/**
 * \brief Interrupt handler for a TWI peripheral. Manages asynchronous transfer
 * occuring on the bus. This function MUST be called by the interrupt service
 * routine of the TWI peripheral if asynchronous read/write are needed.
  * \param pTwid  Pointer to a Twid instance.
 */
void TWID_Handler( Twid *pTwid )
{
    uint8_t status;
    AsyncTwi *pTransfer ;
    Twi *pTwi ;

    assert( pTwid != NULL ) ;

    pTransfer = (AsyncTwi*)pTwid->pTransfer ;
    assert( pTransfer != NULL ) ;
    pTwi = pTwid->pTwi ;
    assert( pTwi != NULL ) ;

    /* Retrieve interrupt status */
    status = TWI_GetMaskedStatus(pTwi);

    /* Byte received */
    if (TWI_STATUS_RXRDY(status)) {

        pTransfer->pData[pTransfer->transferred] = TWI_ReadByte(pTwi);
        pTransfer->transferred++;

        /* check for transfer finish */
        if (pTransfer->transferred == pTransfer->num) {

            TWI_DisableIt(pTwi, TWI_IDR_RXRDY);
            TWI_EnableIt(pTwi, TWI_IER_TXCOMP);
        }
        /* Last byte? */
        else if (pTransfer->transferred == (pTransfer->num - 1)) {

            TWI_Stop(pTwi);
        }
    }
    /* Byte sent*/
    else if (TWI_STATUS_TXRDY(status)) {

        /* Transfer finished ? */
        if (pTransfer->transferred == pTransfer->num) {

            TWI_DisableIt(pTwi, TWI_IDR_TXRDY);
            TWI_EnableIt(pTwi, TWI_IER_TXCOMP);
            TWI_SendSTOPCondition(pTwi);
        }
        /* Bytes remaining */
        else {

            TWI_WriteByte(pTwi, pTransfer->pData[pTransfer->transferred]);
            pTransfer->transferred++;
        }
    }
    /* Transfer complete*/
    else if (TWI_STATUS_TXCOMP(status)) {

        TWI_DisableIt(pTwi, TWI_IDR_TXCOMP);
        pTransfer->status = 0;
        pTwid->pTransfer = 0;
        if (pTransfer->callback) {

            pTransfer->callback((Async *) pTransfer);
        }
    }
}