From f842a40df4d26bd74b92a3903096fc6b1709222d Mon Sep 17 00:00:00 2001
From: Tim Radvan
Date: Fri, 2 Apr 2021 19:35:18 +0100
Subject: 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>
---
 examples/rp2/pio_uart_rx.py | 1 +
 1 file changed, 1 insertion(+)

(limited to 'examples')

diff --git a/examples/rp2/pio_uart_rx.py b/examples/rp2/pio_uart_rx.py
index 41dfde3da..080b6bd63 100644
--- a/examples/rp2/pio_uart_rx.py
+++ b/examples/rp2/pio_uart_rx.py
@@ -22,6 +22,7 @@ PIO_RX_PIN = Pin(3, Pin.IN, Pin.PULL_UP)
     autopush=True,
     push_thresh=8,
     in_shiftdir=rp2.PIO.SHIFT_RIGHT,
+    fifo_join=PIO.JOIN_RX,
 )
 def uart_rx_mini():
     # fmt: off
-- 
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