From a8822a16b4895e862cf26a3b64863fc082af2888 Mon Sep 17 00:00:00 2001
From: tmk <hasu@tmk-kbd.com>
Date: Wed, 13 May 2015 16:53:32 +0900
Subject: [PATCH] hhkb: Fix scan rate for HHKB JP #203

---
 keyboard/hhkb/matrix.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/keyboard/hhkb/matrix.c b/keyboard/hhkb/matrix.c
index fb969979..14fae0b8 100644
--- a/keyboard/hhkb/matrix.c
+++ b/keyboard/hhkb/matrix.c
@@ -132,7 +132,13 @@ uint8_t matrix_scan(void)
 
             // NOTE: KEY_STATE keep its state in 20us after KEY_ENABLE.
             // This takes 25us or more to make sure KEY_STATE returns to idle state.
+#ifdef HHKB_JP
+            // Looks like JP needs faster scan due to its twice larger matrix
+            // or it can drop keys in fast key typing
+            _delay_us(30);
+#else
             _delay_us(75);
+#endif
         }
         if (matrix[row] ^ matrix_prev[row]) matrix_last_modified = timer_read32();
     }