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/*
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-10-30 DongBowen first version
*/
#include <rthw.h>
#include <rtthread.h>
#include "board.h"
#include "hc32l196_sysctrl.h"
#include "hc32l196_flash.h"
/**
* @brief BSP clock initialize.
* Set board system clock to PLL@48MHz by RCH
* @param None
* @retval None
*/
void rt_hw_board_clock_init(void)
{
stc_sysctrl_pll_cfg_t stcPLLCfg;
Sysctrl_SetHCLKDiv(SysctrlHclkDiv1);
Sysctrl_SetPCLKDiv(SysctrlPclkDiv1);
/* switch clock to RCL before changing RCH */
Sysctrl_SetRCLTrim(SysctrlRclFreq32768);
Sysctrl_SetRCLStableTime(SysctrlRclStableCycle64);
Sysctrl_ClkSourceEnable(SysctrlClkRCL, TRUE);
Sysctrl_SysClkSwitch(SysctrlClkRCL);
/* set RCH to 4MHz */
Sysctrl_SetRCHTrim(SysctrlRchFreq4MHz);
Sysctrl_ClkSourceEnable(SysctrlClkRCH, TRUE);
stcPLLCfg.enInFreq = SysctrlPllInFreq4_6MHz;
stcPLLCfg.enOutFreq = SysctrlPllOutFreq36_48MHz;
stcPLLCfg.enPllClkSrc = SysctrlPllRch; /* input clock: RCH */
stcPLLCfg.enPllMul = SysctrlPllMul12; /* 4MHz x 12 = 48MHz */
Sysctrl_SetPLLFreq(&stcPLLCfg);
/*
* When the used clock source HCLK is greater than 24M,
* set the FLASH read wait cycle to 1 cycle.
*/
Flash_WaitCycle(FlashWaitCycle1);
/* enable PLL */
Sysctrl_ClkSourceEnable(SysctrlClkPLL, TRUE);
/* switch clock to PLL */
Sysctrl_SysClkSwitch(SysctrlClkPLL);
}
/*******************************************************************************
* Function Name : SysTick_Configuration
* Description : Configures the SysTick for OS tick.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void SysTick_Configuration(void)
{
rt_uint32_t cnts;
cnts = Sysctrl_GetHClkFreq() / RT_TICK_PER_SECOND;
SysTick_Config(cnts);
}
/**
* This is the timer interrupt service routine.
*
*/
void SysTick_Handler(void)
{
/* enter interrupt */
rt_interrupt_enter();
rt_tick_increase();
/* leave interrupt */
rt_interrupt_leave();
}
/**
* This function will initialize HC32 board.
*/
void rt_hw_board_init()
{
/* Configure the System clock */
rt_hw_board_clock_init();
/* Configure the SysTick */
SysTick_Configuration();
#ifdef RT_USING_HEAP
rt_system_heap_init((void *)HEAP_BEGIN, (void *)HEAP_END);
#endif
#ifdef RT_USING_COMPONENTS_INIT
rt_components_board_init();
#endif
#if defined(RT_USING_CONSOLE) && defined(RT_USING_DEVICE)
rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
#endif
}
void rt_hw_us_delay(rt_uint32_t us)
{
uint32_t start, now, delta, reload, us_tick;
start = SysTick->VAL;
reload = SysTick->LOAD;
us_tick = SystemCoreClock / 1000000UL;
do
{
now = SysTick->VAL;
delta = start > now ? start - now : reload + start - now;
}
while (delta < us_tick * us);
}
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