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