The user manual of the LPC11U68 indicates that the DMA can be used with the SSP
Table 229: SSP/SPI DMA Control Register (DMACR, address
RXDMAE Receive DMA Enable. When this bit is set to one 1, DMA
for the receive FIFO is enabled, otherwise receive DMA is
1 TXDMAE Transmit DMA Enable. When this bit is set to one 1, DMA
for the transmit FIFO is enabled, otherwise transmit DMA
Can anybody clarify what are the event which trigger the DMA RX and TX requests (Start of transfers) ?