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/*
* File : board.c
* This file is part of RT-Thread RTOS
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2017-12-12 Bluebear233 first implementation
*/
#include <rtconfig.h>
#include <rtthread.h>
#include <board.h>
#include <usart.h>
#include <NUC472_442.h>
#ifdef __CC_ARM
extern int Image$$RW_IRAM1$$ZI$$Limit;
#elif __ICCARM__
#pragma section="HEAP"
#else
extern int __bss_end__;
#endif
/**
* This function will initial Clock tree.
*/
void clock_init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Unlock protected registers */
SYS_UnlockReg();
/* Enable External XTAL (4~24 MHz) */
CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);
/* Waiting for 12MHz clock ready */
CLK_WaitClockReady( CLK_STATUS_HXTSTB_Msk);
/* Switch HCLK clock source to HXT */
CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HXT,CLK_CLKDIV0_HCLK(1));
/* Set PLL to power down mode and PLL_STB bit in CLKSTATUS register will be cleared by hardware.*/
CLK->PLLCTL |= CLK_PLLCTL_PD_Msk;
/* Set PLL frequency */
CLK->PLLCTL = CLK_PLLCTL_84MHz_HXT;
/* Waiting for clock ready */
CLK_WaitClockReady(CLK_STATUS_PLLSTB_Msk);
/* Switch HCLK clock source to PLL */
CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_PLL,CLK_CLKDIV0_HCLK(1));
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate SystemCoreClock. */
SystemCoreClockUpdate();
/* Lock protected registers */
SYS_LockReg();
}
/**
* This function will initial NUC472 board.
*/
void rt_hw_board_init(void)
{
clock_init();
#ifdef RT_USING_HEAP
#ifdef __CC_ARM
rt_system_heap_init((void*)&Image$$RW_IRAM1$$ZI$$Limit, (void*)SRAM_END);
#elif __ICCARM__
rt_system_heap_init(__segment_end("HEAP"), (void*)SRAM_END);
#else
/* init memory system */
rt_system_heap_init((void*)&__bss_end__, (void*)SRAM_END);
#endif
#endif /* RT_USING_HEAP */
rt_hw_usart_init();
rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
}
/**
* This is the timer interrupt service routine.
*
*/
void SysTick_Handler(void)
{
/* enter interrupt */
rt_interrupt_enter();
rt_tick_increase();
/* leave interrupt */
rt_interrupt_leave();
}
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