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Direct Memory Access (DMA)

TMS320F2837xD Microcontroller Workshop - Direct Memory Access 8 - 13

DMA Trigger Source Selection Registers

 Selects the Trigger Source for each DMA channel

 Each channel can be triggered by up to 256 interrupt sources

 Select ‘no peripheral’ if trigger is generated by software

 Default value = 0x00

 See “Peripheral Interrupt Trigger Sources” table on next slide

CH4

31 - 24 7 - 0

CH3 CH2 CH1

23 - 16 15 - 8

DmaClaSrcSelRegs.DMACHSRCSEL1

reserved

31 - 24 7 - 0

reserved CH6 CH5

23 - 16 15 - 8

DmaClaSrcSelRegs.DMACHSRCSEL2

Note: DMACHSRCSELLOCK register can be used to lock above registers (lock bit for each register)

Peripheral Interrupt Trigger Sources

0 No Peripheral 13 ADCCINT3 36 EPWM1SOCA 49 EPWM7SOCB 70 TINT2 109 SPITXDMAA

1 ADCAINT1 14 ADCCINT4 37 EPWM1SOCB 50 EPWM8SOCA 71 MXEVTA 110 SPIRXDMAA

2 ADCAINT2 15 ADCCEVT 38 EPWM2SOCA 51 EPWM8SOCB 72 MREVTA 111 SPITXDMAB

3 ADCAINT3 16 ADCDINT1 39 EPWM2SOCB 52 EPWM9SOCA 73 MXEVTB 112 SPIRXDMAB

4 ADCAINT4 17 ADCDINT2 40 EPWM3SOCA 53 EPWM9SOCB 74 MREVTB 113 SPITXDMAC

5 ADCAEVT 18 ADCDINT3 41 EPWM3SOCB 54 EPWM10SOCA 95 SD1FLT1 114 SPIRXDMAC

6 ADCBINT1 19 ADCDINT4 42 EPWM4SOCA 55 EPWM10SOCB 96 SD1FLT2 131 USBA_EPx_RX1

7 ADCBINT2 20 ADCDEVT 43 EPWM4SOCB 56 EPWM11SOCA 97 SD1FLT3 132 USBA_EPx_TX1

8 ADCBINT3 29 XINT1 44 EPWM5SOCA 57 EPWM11SOCB 98 SD1FLT4 133 USBA_EPx_RX2

9 ADCBINT4 30 XINT2 45 EPWM5SOCB 58 EPWM12SOCA 99 SD2FLT1 134 USBA_EPx_TX2

10 ADCBEVT 31 XINT3 46 EPWM6SOCA 59 EPWM12SOCB 100 SD2FLT2 135 USBA_EPx_RX3

11 ADCCINT1 32 XINT4 47 EPWM6SOCB 68 TINT0 101 SD2FLT3 136 USBA_EPx_TX3

12 ADCCINT2 33 XINT5 48 EPWM7SOCA 69 TINT1 102 SD2FLT4

// Set DMA Channel 2 to trigger on EPWM1SOCA

DmaClaSrcSelRegs.DMACHSRCSEL1.bit.CH2 = 36;

Note: values not shown in table are reserved

Texas Instruments TMS320F2837 D Series Workshop Guide And Lab Manual

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