Hier die Initialisierung des DMA + SPI
1 |
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2 | DmaChannel dmaTxChn=DMA_CHANNEL1;
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3 |
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4 | SpiChannel spiTxChn=SPI_CHANNEL4;
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5 |
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6 | SpiChnOpen(spiTxChn, SPI_OPEN_MSTEN|SPI_OPEN_SMP_END|SPI_OPEN_MODE8, 100);
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7 |
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8 | DmaChnOpen(dmaTxChn, DMA_CHN_PRI2, DMA_OPEN_DEFAULT);
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9 |
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10 | DmaChnSetEventControl(dmaTxChn, DMA_EV_START_IRQ_EN|DMA_EV_START_IRQ(_SPI4_TX_IRQ));
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11 |
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12 | DmaChnSetTxfer(dmaTxChn, dmaBuffer, (void*)&SPI4BUF, sizeof(dmaBuffer), 1, 1);
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13 |
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14 | DmaChnSetEvEnableFlags(dmaTxChn, DMA_EV_BLOCK_DONE);
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15 |
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16 | INTConfigureSystem(INT_SYSTEM_CONFIG_MULT_VECTOR);
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17 | INTEnableInterrupts();
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18 |
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19 | INTSetVectorPriority(INT_VECTOR_DMA(dmaTxChn), INT_PRIORITY_LEVEL_5);
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20 | INTSetVectorSubPriority(INT_VECTOR_DMA(dmaTxChn), INT_SUB_PRIORITY_LEVEL_3);
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21 |
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22 | INTEnable(INT_SOURCE_DMA(dmaTxChn), INT_ENABLED);
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23 |
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24 | DmaTxIntFlag=0;
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Und hier wird das Array gesendet,
1 | if(newPressed){
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2 | dmaBuff[0] = 123;
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3 | dmaBuff[1] = 0xff;
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4 | dmaBuff[2] = pressedKeys;
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5 | for(i=3;i<12;i++)
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6 | dmaBuff[i] = 'U';
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7 | DmaChnStartTxfer(DMA_CHANNEL1, DMA_WAIT_NOT, 0);
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8 | newPressed = 0;
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9 | pressedKeys = 0;
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10 | }
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und noch die ISR
1 |
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2 | void __ISR(_DMA1_VECTOR, ipl5) IpcDmaHandler(void)
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3 | {
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4 | int evFlags; // event flags when getting the interrupt
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5 |
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6 | INTClearFlag(INT_SOURCE_DMA(DMA_CHANNEL1));
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7 | evFlags=DmaChnGetEvFlags(DMA_CHANNEL1);
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8 |
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9 | if(evFlags&DMA_EV_BLOCK_DONE)
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10 | {
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11 | DmaTxIntFlag=1;
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12 |
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13 | DmaChnClrEvFlags(DMA_CHANNEL1, DMA_EV_BLOCK_DONE);
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14 | }
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15 | }
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dmaBuff[0] = 123;
dmaBuff[1] = 0xff; <-----NICHT AUF DEM OSZI ZU SEHEN
dmaBuff[2] = pressedKeys;
