OMAP L138 McBSP EDMA transmit trigger

Hi,

I'm currently running SYS/BIOS 6.40 and are setting up an outgoing EDMA stream for the McBSP0 device on the OMAP L138 (DSP side). Having set up EDMA for both SPI RX and TX successfully, I would like to have some clarification about what triggers the DMA to start transfers to the McBSP transmit register.

For the SPI peripheral I had to explicitly enable DMA events, but looking at the McBSP register set (unless I am missing it), I am not seeing any explicit DMA event enable bits.

Any help would be appreciated.

Thanks