コード例 #1
0
ファイル: main.c プロジェクト: ctapang/v0_70_01b
int main(void)
{
    /* Disable JTAG to free up PORTA pins */
    DDPCONbits.JTAGEN = 0;

    /* Set the lower 8 bits of PORTA as output (for Explorer-16 LEDs),
       clear the bits to ensure there is no mismatch when they are toggled */
    PLIB_PORTS_DirectionOutputSet(PORTS_ID_0, PORT_CHANNEL_A, (PORTS_DATA_MASK)0x00FF);
    PLIB_PORTS_Clear(PORTS_ID_0, PORT_CHANNEL_A, (PORTS_DATA_MASK)0x00FF);

    /* Enable the DMA module */
    PLIB_DMA_Enable(DMA_ID_0);

    /* Channel is continuously enabled */
    PLIB_DMA_ChannelXAutoEnable(DMA_ID_0, DMA_CHANNEL_0);

    /* Set the source and destinaton addresses (addresses are converted from virtual to physical) */
    PLIB_DMA_ChannelXSourceStartAddressSet(DMA_ID_0, DMA_CHANNEL_0, (uint32_t)LED_pattern);
    PLIB_DMA_ChannelXDestinationStartAddressSet(DMA_ID_0, DMA_CHANNEL_0, (uint32_t)&LATA);

    /* Set the source and destination sizes */
    PLIB_DMA_ChannelXSourceSizeSet(DMA_ID_0, DMA_CHANNEL_0, sizeof(LED_pattern));
    PLIB_DMA_ChannelXDestinationSizeSet(DMA_ID_0, DMA_CHANNEL_0, 1);

    /* Set the number of bytes per transfer */
    PLIB_DMA_ChannelXCellSizeSet(DMA_ID_0, DMA_CHANNEL_0, 1);

    /* DMA transfer to start on Timer 1 interrupt */
    PLIB_DMA_ChannelXTriggerEnable(DMA_ID_0, DMA_CHANNEL_0, DMA_CHANNEL_TRIGGER_TRANSFER_START);
    PLIB_DMA_ChannelXStartIRQSet(DMA_ID_0, DMA_CHANNEL_0, DMA_TRIGGER_TIMER_1);

    /* Setup Timer 1 to trigger an interrupt 10 times a second */
    PLIB_TMR_ClockSourceSelect(TMR_ID_1, TMR_CLOCK_SOURCE_PERIPHERAL_CLOCK);
    PLIB_TMR_PrescaleSelect(TMR_ID_1, TMR_PRESCALE_VALUE_256);
    PLIB_TMR_Counter16BitClear(TMR_ID_1);
    PLIB_TMR_Period16BitSet(TMR_ID_1, 3906);

    /* Enable the Timer 1 interrupt source, set its priority level to 2, set
       its subpriority level to 0 */
    PLIB_INT_SourceEnable(INT_ID_0, INT_SOURCE_TIMER_1);
    PLIB_INT_VectorPrioritySet(INT_ID_0, INT_VECTOR_T1, INT_PRIORITY_LEVEL2);
    PLIB_INT_VectorSubPrioritySet(INT_ID_0, INT_VECTOR_T1, INT_SUBPRIORITY_LEVEL0);

    /* Enable multi-vectored interrupts, enable the generation of interrupts to the CPU */
    PLIB_INT_MultiVectorSelect(INT_ID_0);
    PLIB_INT_Enable(INT_ID_0);

    /* Enable DMA channel 0 */
    PLIB_DMA_ChannelXEnable(DMA_ID_0, DMA_CHANNEL_0);

    /* Start Timer 1 */
    PLIB_TMR_Start(TMR_ID_1);

    /* Stuck in this loop, waiting for interrupts to occur */
    while (1);

    /* Program should not go here during normal operation */
    return EXIT_FAILURE;
}
コード例 #2
0
ファイル: drv_wifi_spi.c プロジェクト: ctapang/v0_70_01b
void IspSpiDMA_Rx(uint8_t *pbuf,uint16_t length)
{
    bool intDisabled;
    unsigned char  txTrash[3000];
    // pbuf points to uint8_t array of data to be received from MRF
    // length indicates number of bytes to read
    intDisabled = WF_EintIsDisabled();
    WF_EintDisable();


    IEC1CLR=0x00030000; // disable DMA channel 0&1 interrupts
    IFS1CLR=0x00030000; // clear existing DMA channel 0&1 interrupt flag


    PLIB_DMA_Enable(0); // DMACONSET=0x00008000; // enable the DMA controller
    
    
    PLIB_DMA_ChannelXPrioritySelect(0,DMA_CHANNEL_0, DMA_CHANNEL_PRIORITY_3);//DCH0CONSET = 0x3; // channel off, pri 3, no chaining
    PLIB_DMA_ChannelXChainDisable(0,DMA_CHANNEL_0);
    PLIB_DMA_ChannelXPrioritySelect(0,DMA_CHANNEL_1, DMA_CHANNEL_PRIORITY_2);//    DCH1CONSET = 0x03;//0x62;
    PLIB_DMA_ChannelXChainEnable(0,DMA_CHANNEL_1);
    
    DCH0ECONCLR=0xFFFFFFFF; // no start or stop irq?s, no pattern match
    DCH1ECONCLR=0xFFFFFFFF; // no start or stop irq?s, no pattern match

    // program the transfer
    PLIB_DMA_ChannelXSourceStartAddressSet     (0,DMA_CHANNEL_0, ((unsigned long int)txTrash) & 0x1FFFFFFFL);
    PLIB_DMA_ChannelXDestinationStartAddressSet(0,DMA_CHANNEL_1, ((unsigned long int)pbuf)     & 0x1FFFFFFFL);
    
    if( MRF24W_SPI_CHN == 1)
    {
        PLIB_DMA_ChannelXDestinationStartAddressSet(0,DMA_CHANNEL_0, ((unsigned long int)&SPI1BUF) & 0x1FFFFFFFL);
        PLIB_DMA_ChannelXSourceStartAddressSet     (0,DMA_CHANNEL_1, ((unsigned long int)&SPI1BUF) & 0x1FFFFFFFL);
    }
    else if( MRF24W_SPI_CHN == 2) 
    {
        PLIB_DMA_ChannelXDestinationStartAddressSet(0,DMA_CHANNEL_0, ((unsigned long int)&SPI2BUF) & 0x1FFFFFFFL);
        PLIB_DMA_ChannelXSourceStartAddressSet       (0,DMA_CHANNEL_1, ((unsigned long int)&SPI2BUF) & 0x1FFFFFFFL);
    }

    PLIB_DMA_ChannelXSourceSizeSet     (0,DMA_CHANNEL_0,length); 
    PLIB_DMA_ChannelXDestinationSizeSet(0,DMA_CHANNEL_0,1     );
    PLIB_DMA_ChannelXCellSizeSet       (0,DMA_CHANNEL_0,1     );

    PLIB_DMA_ChannelXSourceSizeSet     (0,DMA_CHANNEL_1,1); 
    PLIB_DMA_ChannelXDestinationSizeSet(0,DMA_CHANNEL_1,length);
    PLIB_DMA_ChannelXCellSizeSet       (0,DMA_CHANNEL_1,1     );


    DCH0INTCLR=0x00ff00ff; // clear existing events, disable all interrupts
    DCH1INTCLR=0x00ff00ff; // clear existing events, disable all interrupts

    // initiate a transfer
    PLIB_DMA_ChannelXStartIRQSet(0, DMA_CHANNEL_0, DMA_TRIGGER_SPI_1_TRANSMIT);
    PLIB_DMA_ChannelXTriggerEnable(0, DMA_CHANNEL_0, DMA_CHANNEL_TRIGGER_TRANSFER_START);

    PLIB_DMA_ChannelXStartIRQSet(0, DMA_CHANNEL_1, DMA_TRIGGER_SPI_1_RECEIVE);
    PLIB_DMA_ChannelXTriggerEnable(0, DMA_CHANNEL_1, DMA_CHANNEL_TRIGGER_TRANSFER_START);


    PLIB_DMA_ChannelXEnable(0,DMA_CHANNEL_0);
    PLIB_DMA_ChannelXEnable(0,DMA_CHANNEL_1);
       
//      DCH0ECONSET=0x00000080; // set CFORCE to 1
    // do something else
    // poll to see that the transfer was done
    while(true)
    {
        register int pollCnt; // use a poll counter.
        // continuously polling the DMA controller in a tight
        // loop would affect the performance of the DMA transfer
        int dma0Flags=DCH0INT;
        int dma1Flags = DCH1INT;
        if((dma0Flags&0xb)&&(dma1Flags&0xb))
        {            // one of CHERIF (DCHxINT<0>), CHTAIF (DCHxINT<1>)
                    // or CHBCIF (DCHxINT<3>) flags set
            break;    // transfer completed
        }
        pollCnt=length<<1; // use an adjusted value here
        while(pollCnt--); // wait before reading again the DMA controller
    }


    PLIB_DMA_Disable(0);

    if(!intDisabled)
    {
        WF_EintEnable();
    }
}
コード例 #3
0
ファイル: sys_dma.c プロジェクト: TheThingsProducts/gateway
void SYS_DMA_ChannelSetup
(
    SYS_DMA_CHANNEL_HANDLE handle,
    SYS_DMA_CHANNEL_OP_MODE modeEnable,
    DMA_TRIGGER_SOURCE eventSrc
)
{

    SYS_DMA_CHANNEL_OBJECT *chanObj;
    DMA_CHANNEL channelNumber;

    chanObj = (SYS_DMA_CHANNEL_OBJECT *) handle;
    channelNumber = (chanObj  - (SYS_DMA_CHANNEL_OBJECT *) &gSysDMAChannelObj[0]);

    /* Setup the channel modes */
    /* Basic mode, nothing specifically needs to be set */
    if(SYS_DMA_CHANNEL_OP_MODE_BASIC & modeEnable)
    {
        /* Do nothing */
        ;
    }

    /* Pattern match Abort */
    if(SYS_DMA_CHANNEL_OP_MODE_MATCH_ABORT & modeEnable)
    {
        PLIB_DMA_ChannelXTriggerEnable( DMA_ID_0, channelNumber,
                                        DMA_CHANNEL_TRIGGER_PATTERN_MATCH_ABORT);
    }

    /* Channel chaining mode */
    if(SYS_DMA_CHANNEL_OP_MODE_CHAIN_HIGH & modeEnable)
    {
        PLIB_DMA_ChannelXChainEnable( DMA_ID_0, channelNumber);
        PLIB_DMA_ChannelXChainToHigher(DMA_ID_0, channelNumber);
        PLIB_DMA_ChannelXDisabledEnablesEvents(DMA_ID_0, channelNumber);
    }
    else if(SYS_DMA_CHANNEL_OP_MODE_CHAIN_LOW & modeEnable)
    {
        PLIB_DMA_ChannelXChainEnable( DMA_ID_0, channelNumber);
        PLIB_DMA_ChannelXChainToLower(DMA_ID_0, channelNumber);
        PLIB_DMA_ChannelXDisabledEnablesEvents(DMA_ID_0, channelNumber);
    }
    else
    {
        ;
    }

    /* Auto Enable mode */
    if(SYS_DMA_CHANNEL_OP_MODE_AUTO & modeEnable)
    {
        PLIB_DMA_ChannelXAutoEnable( DMA_ID_0, channelNumber);
    }

    /* CRC Enable */
    if(SYS_DMA_CHANNEL_OP_MODE_CRC & modeEnable)
    {
            PLIB_DMA_CRCEnable( DMA_ID_0);
    }


    /* Setup the DMA Trigger Source and Enable it */
    if(DMA_TRIGGER_SOURCE_NONE == eventSrc)
    {
        /* This is polling mode of Implementation */
        PLIB_DMA_ChannelXINTSourceEnable(DMA_ID_0, channelNumber,
                                            DMA_INT_BLOCK_TRANSFER_COMPLETE);
        PLIB_DMA_ChannelXINTSourceEnable(DMA_ID_0, channelNumber,
                                            DMA_INT_ADDRESS_ERROR);
    }
    else
    {
        PLIB_DMA_ChannelXStartIRQSet( DMA_ID_0, channelNumber, eventSrc);
        PLIB_DMA_ChannelXTriggerEnable( DMA_ID_0, channelNumber, DMA_CHANNEL_TRIGGER_TRANSFER_START);

        /* We need to notify the user on the completion of a transfer request.
         * Setting the DMA block completion transfer interrupt. */
        PLIB_DMA_ChannelXINTSourceEnable(DMA_ID_0, channelNumber,
                                                DMA_INT_BLOCK_TRANSFER_COMPLETE);
        PLIB_DMA_ChannelXINTSourceEnable(DMA_ID_0, channelNumber,
                                            DMA_INT_ADDRESS_ERROR);
    }
    return;
}