From 9a32a7b40442e54ee6d8e2403e0f9a154dc4c77f Mon Sep 17 00:00:00 2001 From: Michael Sevakis Date: Sat, 18 Feb 2012 04:50:33 -0500 Subject: Split CPU-optimized beep code into the firmware/asm tree. For now due to current lack of an apps/asm, place the ASM/generic code in the firmware/asm directory. Additionally, make generic beep code more generic. Change-Id: I4a69b6ffcbb97d9e6dfde2209c5a118de19e5638 --- firmware/asm/arm/beep.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 firmware/asm/arm/beep.c (limited to 'firmware/asm/arm/beep.c') diff --git a/firmware/asm/arm/beep.c b/firmware/asm/arm/beep.c new file mode 100644 index 0000000000..f3c3e2e0d2 --- /dev/null +++ b/firmware/asm/arm/beep.c @@ -0,0 +1,39 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (c) 2011 Michael Sevakis + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ + +/* Actually output samples into beep_buf */ +static FORCE_INLINE void beep_generate(uint32_t *out, int count, + int32_t *phase, uint32_t step, + uint32_t amplitude) +{ + uint32_t s; + + asm volatile ( + "1: \n" + "eor %3, %5, %1, asr #31 \n" + "subs %2, %2, #1 \n" + "str %3, [%0], #4 \n" + "add %1, %1, %4 \n" + "bgt 1b \n" + : "+r"(out), "+r"(*phase), "+r"(count), + "=&r"(s) + : "r"(step), "r"(amplitude)); +} -- cgit v1.2.3