92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
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/*
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* Copyright (c) 2006-2019, RT-Thread Development Team
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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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* 2017-07-24 Tanek the first version
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* 2018-11-12 Ernest Chen modify copyright
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*/
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#include <stdint.h>
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#include <rthw.h>
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#include <rtthread.h>
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#define _SCB_BASE (0xE000E010UL)
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#define _SYSTICK_CTRL (*(rt_uint32_t *)(_SCB_BASE + 0x0))
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#define _SYSTICK_LOAD (*(rt_uint32_t *)(_SCB_BASE + 0x4))
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#define _SYSTICK_VAL (*(rt_uint32_t *)(_SCB_BASE + 0x8))
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#define _SYSTICK_CALIB (*(rt_uint32_t *)(_SCB_BASE + 0xC))
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#define _SYSTICK_PRI (*(rt_uint8_t *)(0xE000ED23UL))
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// Updates the variable SystemCoreClock and must be called
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// whenever the core clock is changed during program execution.
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extern void SystemCoreClockUpdate(void);
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// Holds the system core clock, which is the system clock
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// frequency supplied to the SysTick timer and the processor
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// core clock.
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extern uint32_t SystemCoreClock;
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static uint32_t _SysTick_Config(rt_uint32_t ticks)
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{
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if ((ticks - 1) > 0xFFFFFF)
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{
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return 1;
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}
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_SYSTICK_LOAD = ticks - 1;
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_SYSTICK_PRI = 0xFF;
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_SYSTICK_VAL = 0;
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_SYSTICK_CTRL = 0x07;
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return 0;
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}
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#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
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#define RT_HEAP_SIZE 1024
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static uint32_t rt_heap[RT_HEAP_SIZE]; // heap default size: 4K(1024 * 4)
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RT_WEAK void *rt_heap_begin_get(void)
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{
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return rt_heap;
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}
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RT_WEAK void *rt_heap_end_get(void)
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{
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return rt_heap + RT_HEAP_SIZE;
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}
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#endif
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/* This function will initial your board. */
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void rt_hw_board_init()
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{
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/* System Clock Update */
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SystemCoreClockUpdate();
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/* System Tick Configuration */
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_SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
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/* Call components board initial (use INIT_BOARD_EXPORT()) */
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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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//#ifdef RT_USING_CONSOLE
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// rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
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//#endif
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#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
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rt_system_heap_init(rt_heap_begin_get(), rt_heap_end_get());
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#endif
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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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