/******************************************************************************
 * The MIT License
 *
 * Copyright (c) 2010 Perry Hung.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *****************************************************************************/

/**
 *  @brief Delay implementation.
 */

#include "libmaple.h"
#include "systick.h"
#include "time.h"

void delay(unsigned long ms) {
    uint32 i;
    for (i = 0; i < ms; i++) {
        delayMicroseconds(1000);
    }
}

void delayMicroseconds(uint32 us) {
    /* So (2^32)/12 micros max, or less than 6 minutes */
    us *= 12;

    /* fudge for function call overhead  */
    us--;
    asm volatile("   mov r0, %[us]          \n\t"
                 "1: subs r0, #1            \n\t"
                 "   bhi 1b                 \n\t"
                 :
                 : [us] "r" (us)
                 : "r0");
}