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Tim Radvan f842a40df4 rp2/rp2_pio: Add fifo_join support for PIO. 
The PIO state machines on the RP2040 have 4 word deep TX and RX FIFOs.  If
you only need one direction, you can "merge" them into either a single 8
word deep TX or RX FIFO.

We simply add constants to the PIO object, and set the appropriate bits in
`shiftctrl`.

Resolves #6854.

Signed-off-by: Tim Radvan <tim@tjvr.org>
 		2021-04-17 00:45:38 +10:00
..
_boot.py rp2: Add new port to Raspberry Pi RP2 microcontroller. 2021-01-30 00:42:29 +11:00
rp2.py rp2/rp2_pio: Add fifo_join support for PIO. 2021-04-17 00:45:38 +10:00