/*
 * Copyright (C) 2017-2019 Alibaba Group Holding Limited. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */



/******************************************************************************
 * @file     lib.c
 * @brief    source file for the lib
 * @version  V1.0
 * @date     02. June 2017
 ******************************************************************************/
#include <csi_config.h>
#include <stdint.h>
#include <stdarg.h>
#include <stdio.h>
#include "soc.h"
#include "csi_core.h"     //for test
#include "drv_usart.h"

extern uint32_t csi_coret_get_load(void);
extern uint32_t csi_coret_get_value(void);
extern uint32_t csi_coret_get_valueh(void);

extern int32_t csi_usart_putchar(usart_handle_t handle, uint8_t ch);
extern int32_t csi_usart_getchar(usart_handle_t handle, uint8_t *ch);

static void _mdelay(void)
{
    unsigned long long start, cur, delta;
    uint32_t startl = csi_coret_get_value();
    uint32_t starth = csi_coret_get_valueh();
    uint32_t curl, curh;
    uint32_t cnt = (drv_get_sys_freq() / 1000);
    start = ((unsigned long long)starth << 32) | startl;

    while (1) {
        curl = csi_coret_get_value();
        curh = csi_coret_get_valueh();
        cur = ((unsigned long long)curh << 32) | curl;
        delta = cur - start;

        if (delta >= cnt) {
            return;
        }
    }
}

void mdelay(uint32_t ms)
{
    if (ms == 0) {
        return;
    }

    while (ms--) {
        _mdelay();
    }
}