From 3eac707635cc94dfd00afde85a7ea31b48a8c551 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Tue, 8 Oct 2019 15:20:39 +0800
Subject: [PATCH] fix glasgow sample decoding

---
 src/noptica.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/noptica.rs b/src/noptica.rs
index ee20297..b1d9a27 100644
--- a/src/noptica.rs
+++ b/src/noptica.rs
@@ -114,8 +114,8 @@ pub fn sample(command: &str, mut callback: impl FnMut(u8, u8)) {
     let mut last_sample = 0;
     loop {
         reader.read_exact(&mut buffer).unwrap();
-        for shift in [4u8, 0u8].iter() {
-            let sample = (buffer[0] >> shift) & 0x0f;
+        for shift in [2u8, 0u8].iter() {
+            let sample = (buffer[0] >> shift) & 0x03;
             let rising = sample & !last_sample;
             let falling = !sample & last_sample;
             callback(rising, falling);