From 2c19e5772dbc885e3342dea7263dc1a5978258a0 Mon Sep 17 00:00:00 2001
From: sekigon-gonnoc <43873124+sekigon-gonnoc@users.noreply.github.com>
Date: Sat, 24 Aug 2024 18:53:51 +0900
Subject: [PATCH] Fix pre-encoded data buffer overflow

---
 src/pio_usb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/pio_usb.c b/src/pio_usb.c
index 27407da..e84b6fa 100644
--- a/src/pio_usb.c
+++ b/src/pio_usb.c
@@ -458,12 +458,13 @@ uint8_t __no_inline_not_in_flash_func(pio_usb_ll_encode_tx_data)(
   encoded_data[byte_idx] |= PIO_USB_TX_ENCODED_DATA_COMP;
   bit_idx++;
 
+  // terminate buffers with K
   do {
     byte_idx = bit_idx >> 2;
     encoded_data[byte_idx] <<= 2;
     encoded_data[byte_idx] |= PIO_USB_TX_ENCODED_DATA_K;
     bit_idx++;
-  } while (bit_idx & 0x07);
+  } while (bit_idx & 0x03);
 
   byte_idx = bit_idx >> 2;
   return byte_idx;