13.5.3.1 Fixed channel arbitration
In this mode, the channel service request from the highest priority channel is selected to
execute.
13.5.3.2 Round-robin channel arbitration
Channels are serviced starting with the highest channel number and rotating through to
the lowest channel number without regard to the channel priority levels.
13.5.4 Performing DMA transfers
This section presents examples on how to perform DMA transfers with the eDMA.
13.5.4.1 Single request
To perform a simple transfer of n bytes of data with one activation, set the major loop to
one (TCDn_CITER = TCDn_BITER = 1). The data transfer begins after the channel
service request is acknowledged and the channel is selected to execute. After the transfer
is complete, the TCDn_CSR[DONE] bit is set and an interrupt generates if properly
enabled.
For example, the following TCD entry is configured to transfer 16 bytes of data. The
eDMA is programmed for one iteration of the major loop transferring 16 bytes per
iteration. The source memory has a byte wide memory port located at 0x1000. The
destination memory has a 32-bit port located at 0x2000. The address offsets are
programmed in increments to match the transfer size: one byte for the source and four
bytes for the destination. The final source and destination addresses are adjusted to return
to their beginning values.
TCDn_CITER = TCDn_BITER = 1
TCDn_NBYTES = 16
TCDn_SADDR = 0x1000
TCDn_SOFF = 1
TCDn_ATTR[SSIZE] = 0
TCDn_SLAST = -16
TCDn_DADDR = 0x2000
TCDn_DOFF = 4
TCDn_ATTR[DSIZE] = 2
TCDn_DLAST_SGA= –16
TCDn_CSR[INT_MAJ] = 1
TCDn_CSR[START] = 1 (Should be written last after all other fields have been initialized)
All other TCDn fields = 0
Initialization/application information
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