From b0dd645e27219f8a593f7c5af1339cebffeebfe8 Mon Sep 17 00:00:00 2001
From: Scott Shawcroft <scott@tannewt.org>
Date: Tue, 7 Aug 2018 16:58:37 -0700
Subject: [PATCH] Retune neopixel timings on SAMD51. They were too slow.

Fixes #1083
---
 ports/atmel-samd/common-hal/neopixel_write/__init__.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/ports/atmel-samd/common-hal/neopixel_write/__init__.c b/ports/atmel-samd/common-hal/neopixel_write/__init__.c
index 5530d04085..31de2c207a 100644
--- a/ports/atmel-samd/common-hal/neopixel_write/__init__.c
+++ b/ports/atmel-samd/common-hal/neopixel_write/__init__.c
@@ -111,14 +111,14 @@ void common_hal_neopixel_write(const digitalio_digitalinout_obj_t* digitalinout,
         #ifdef SAMD51
         delay_cycles(3);
         #endif
-        if(p & bitMask) {
+        if((p & bitMask) != 0) {
             // This is the high delay unique to a one bit.
             // For the SK6812 its 0.3us
             #ifdef SAMD21
             asm("nop; nop; nop; nop; nop; nop; nop;");
             #endif
             #ifdef SAMD51
-            delay_cycles(11);
+            delay_cycles(3);
             #endif
             *clr = pinMask;
         } else {
@@ -140,7 +140,7 @@ void common_hal_neopixel_write(const digitalio_digitalinout_obj_t* digitalinout,
             asm("nop; nop; nop; nop; nop;");
             #endif
             #ifdef SAMD51
-            delay_cycles(20);
+            delay_cycles(4);
             #endif
         } else {
             if(ptr >= end) break;
@@ -151,7 +151,7 @@ void common_hal_neopixel_write(const digitalio_digitalinout_obj_t* digitalinout,
             // above operations take.
             // For the SK6812 its 0.6us +- 0.15us
             #ifdef SAMD51
-            delay_cycles(15);
+            delay_cycles(3);
             #endif
         }
     }