/*---------------------------------------
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- github: github.com/WeActTC
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- blog: www.weact-tc.cn
---------------------------------------*/

#include "systick.h"
#include "ch32v10x.h"
#include "ch32v10x_pwr.h"

void SysTick_Handler(void) __attribute__((interrupt("WCH-Interrupt-fast")));

volatile uint32_t _tick = 0;

/*!
    \brief      configure systick
    \param[in]  none
    \param[out] none
    \retval     none
*/
void systick_config(void)
{
    uint32_t ticks = (SystemCoreClock / SysTick_Tick);

    //关闭系统计数器STK，计数器停止计数
    SysTick->CTLR = 0x0000;

    //设置系统计数器寄存器的值

    //系统计数器低位寄存器
    SysTick->CNTL0 = 0;
    SysTick->CNTL1 = 0;
    SysTick->CNTL2 = 0;
    SysTick->CNTL3 = 0;

    //系统计数器高位寄存器
    SysTick->CNTH0 = 0;
    SysTick->CNTH1 = 0;
    SysTick->CNTH2 = 0;
    SysTick->CNTH3 = 0;

    //设置计数比较寄存器的值，主要用于触发STK中断服务函数。当CNT[63:0]与CMP[63:0]值相等时将触发STK中断服务。
    //设置计数比较低位寄存器的值
    SysTick->CMPLR0 = (uint8_t)(ticks & 0xFF);
    SysTick->CMPLR1 = (uint8_t)(ticks >> 8);
    SysTick->CMPLR2 = (uint8_t)(ticks >> 16);
    SysTick->CMPLR3 = (uint8_t)(ticks >> 24);

    //设置计数比较高位寄存器的值
    SysTick->CMPHR0 = 0;
    SysTick->CMPHR1 = 0;
    SysTick->CMPHR2 = 0;
    SysTick->CMPHR3 = 0;
    NVIC_SetPriority(SysTicK_IRQn, 15); //设置SysTick中断优先级
    NVIC_EnableIRQ(SysTicK_IRQn);       //使能开启Systick中断
    SysTick->CTLR = 0x0001;             //启动系统计数器STK（HCLK/8时基） 72000000/8=9000000
}

/*!
    \brief      delay a time in milliseconds
    \param[in]  count: count in milliseconds
    \param[out] none
    \retval     none
*/
void delay(uint32_t count)
{
    uint32_t utick;
    utick = count + systick_get_tick();

    while (systick_get_tick() < utick)
    {
    }
}

/*!
    \brief      delay a time in milliseconds with low power
    \param[in]  count: count in milliseconds
    \param[out] none
    \retval     none
*/
void delay_lp(uint32_t count)
{
    uint32_t utick;
    utick = count + systick_get_tick();

    while (systick_get_tick() < utick)
    {
        PWR_EnterSTANDBYMode();
    }
}

/*!
    \brief      delay decrement
    \param[in]  none
    \param[out] none
    \retval     none
*/
void delay_decrement(void)
{
    _tick++;
}

/*!
    \brief      get systick tick
    \param[in]  none
    \param[out] none
    \retval     none
*/

uint32_t systick_get_tick(void)
{
    return _tick;
}

void systick_DisableIRQ(void)
{
    NVIC_DisableIRQ(SysTicK_IRQn);
}

void systick_EnableIRQ(void)
{
    NVIC_EnableIRQ(SysTicK_IRQn);
}

void systick_Disable(void)
{
    /* Disable SysTick */
    //关闭系统计数器STK，计数器停止计数
    SysTick->CTLR = 0x0000;
}

void systick_Enable(void)
{
    /* Enable SysTick */
    //启动系统计数器STK（HCLK/8时基） 72000000/8=9000000
    SysTick->CTLR = 0x0001;
}

void systick_deinit(void)
{
    //关闭系统计数器STK，计数器停止计数
    SysTick->CTLR = 0x0000;
}

void SysTick_Handler(void)
{
    //设置系统计数器寄存器的值
    //系统计数器低位寄存器
    SysTick->CNTL0 = 0;
    SysTick->CNTL1 = 0;
    SysTick->CNTL2 = 0;
    SysTick->CNTL3 = 0;
    //系统计数器高位寄存器
    SysTick->CNTH0 = 0;
    SysTick->CNTH1 = 0;
    SysTick->CNTH2 = 0;
    SysTick->CNTH3 = 0;

    delay_decrement();
}