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samv7: add support for USART TX DMA transfers
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This commit adds support for TX DMA transfers for USART peripheral. Code
refactor in sam_serial.h was also required in order to have correct
defines for all possible cases (both RX and TX DMA used, just one used,
none used).

Signed-off-by: Michal Lenc <[email protected]>
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michallenc committed Mar 4, 2024
1 parent 1eaeef5 commit 263a146
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