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DMA and SSP in LPC11Uxx

Question asked by pberna on Aug 2, 2016
Latest reply on Aug 8, 2016 by Kerry Zhou

Dear All,

 

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

 

disabled.

 

0

 

1 TXDMAE Transmit DMA Enable. When this bit is set to one 1, DMA

 

for the transmit FIFO is enabled, otherwise transmit DMA

 

is disabled

 

Can anybody clarify what are the event which trigger the DMA RX and TX requests (Start of transfers) ?

 

Thanks

 

 

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