From 5a6741415b45eaa2f378791a66c2ec586b7713bf Mon Sep 17 00:00:00 2001
From: Markus Gyger <182590275+magy00@users.noreply.github.com>
Date: Thu, 22 May 2025 09:44:03 +0700
Subject: [PATCH] Allow pio_encode_sideset_opt(0, value)

---
 src/rp2_common/hardware_pio/include/hardware/pio_instructions.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/rp2_common/hardware_pio/include/hardware/pio_instructions.h b/src/rp2_common/hardware_pio/include/hardware/pio_instructions.h
index 671145606..53349fee7 100644
--- a/src/rp2_common/hardware_pio/include/hardware/pio_instructions.h
+++ b/src/rp2_common/hardware_pio/include/hardware/pio_instructions.h
@@ -148,7 +148,7 @@ static inline uint pio_encode_sideset(uint sideset_bit_count, uint value) {
  * \return the side set bits to be ORed with an instruction encoding
  */
 static inline uint pio_encode_sideset_opt(uint sideset_bit_count, uint value) {
-    valid_params_if(PIO_INSTRUCTIONS, sideset_bit_count >= 1 && sideset_bit_count <= 4);
+    valid_params_if(PIO_INSTRUCTIONS, sideset_bit_count >= 0 && sideset_bit_count <= 4);
     valid_params_if(PIO_INSTRUCTIONS, value <= ((1u << sideset_bit_count) - 1));
     return 0x1000u | value << (12u - sideset_bit_count);
 }