From 784790dbec40695bd6d74c862d9e5730e17ba9fd Mon Sep 17 00:00:00 2001
From: Michael Giacomelli <giac2000@hotmail.com>
Date: Mon, 18 Jan 2016 22:35:56 +0100
Subject: [PATCH] Change the clipv2 button driver to use fixed delays rather
 than processor cycle counting.

Also introduce a new delay needed for frequency scaling.

Change-Id: I575a503a8ca44358fcd5512fd951fe9c7bbde31c
---
 firmware/target/arm/as3525/button-clip.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/firmware/target/arm/as3525/button-clip.c b/firmware/target/arm/as3525/button-clip.c
index 35b5e8af5e..c83590a06e 100644
--- a/firmware/target/arm/as3525/button-clip.c
+++ b/firmware/target/arm/as3525/button-clip.c
@@ -118,10 +118,7 @@ bool button_hold(void)
 #ifdef SANSA_CLIPV2
     GPIOA_DIR |= 1<<7;
     GPIOA_PIN(7) = 1<<7;
-
-    int delay = 50;
-    while(delay--)
-        asm("nop");
+    udelay(2);
 #endif
 
     bool hold_button = (GPIOA_PIN(3) != 0);
@@ -129,6 +126,7 @@ bool button_hold(void)
 #ifdef SANSA_CLIPV2
     GPIOA_PIN(7) = 0;
     GPIOA_DIR &= ~(1<<7);
+    udelay(4);
 #endif
 
 #ifndef BOOTLOADER