155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
/*
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* File : board.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2009 RT-Thread Develop Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2009-01-05 Bernard first implementation
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* 2013-11-15 bright add RCC initial and print RCC freq function
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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 "usart.h"
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/**
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* @addtogroup STM32
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*/
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/*@{*/
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/*******************************************************************************
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* Function Name : NVIC_Configuration
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* Description : Configures Vector Table base location.
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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 NVIC_Configuration(void)
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{
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// NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
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}
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/**
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* @brief Inserts a delay time.
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* @param nCount: specifies the delay time length.
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* @retval None
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*/
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static void Delay(__IO uint32_t nCount)
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{
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/* Decrement nCount value */
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while (nCount != 0)
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{
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nCount--;
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}
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}
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/**
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* This RCC initial for system.
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* use HSI clock source and pll
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* HSI = 8; sysclk = 8/2 * 12 = 48MHZ
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* sysclk source is pllclk
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* AHB prescaler is 1, HCLK = SYSCKL = SystemCoreClock = 48MHZ
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*/
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static void RCC_Configuration(void)
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{
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RCC_DeInit();
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/* setup HSI */
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RCC_HSICmd(ENABLE);
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/* Configure PLL source is HSI */
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RCC_PLLConfig(RCC_PLLSource_HSI_Div2, RCC_PLLMul_12);
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RCC_PLLCmd(ENABLE);
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/* Configure SYSCLK source is PLL */
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RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
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/* Conigure AHB prescaler value is 1 */
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RCC_HCLKConfig(RCC_SYSCLK_Div1);
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/* Delay for RCC setup */
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Delay(0x3FFFF);
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/* Update SystemCoreClock value from RCC configure */
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SystemCoreClockUpdate();
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}
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#ifdef PRINT_RCC_FREQ_INFO
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/**
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* print RCC freq information
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*
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* for example:
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*
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* SYSCLK_Frequency is 48000000HZ
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* PCLK_Frequency is 48000000HZ
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* HCLK_Frequency is 48000000HZ
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* CECCLK_Frequency is 32786HZ
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* ADCCLK_Frequency is 14000000HZ
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* USART1CLK_Frequency is 48000000HZ
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* I2C1CLK_Frequency is 8000000HZ
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* SystemCoreClock is 48000000HZ
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*
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*/
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void print_rcc_freq_info(void)
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{
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RCC_ClocksTypeDef RCC_ClockFreq;
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RCC_GetClocksFreq(&RCC_ClockFreq);
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rt_kprintf("\nSYSCLK_Frequency is %dHZ", RCC_ClockFreq.SYSCLK_Frequency);
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rt_kprintf("\nPCLK_Frequency is %dHZ", RCC_ClockFreq.PCLK_Frequency);
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rt_kprintf("\nHCLK_Frequency is %dHZ", RCC_ClockFreq.HCLK_Frequency);
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rt_kprintf("\nCECCLK_Frequency is %dHZ", RCC_ClockFreq.CECCLK_Frequency);
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rt_kprintf("\nADCCLK_Frequency is %dHZ", RCC_ClockFreq.ADCCLK_Frequency);
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rt_kprintf("\nUSART1CLK_Frequency is %dHZ", RCC_ClockFreq.USART1CLK_Frequency);
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rt_kprintf("\nI2C1CLK_Frequency is %dHZ", RCC_ClockFreq.I2C1CLK_Frequency);
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rt_kprintf("\nSystemCoreClock is %dHZ\n", SystemCoreClock);
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}
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#endif
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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 initial STM32 board.
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*/
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void rt_hw_board_init()
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{
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/* NVIC Configuration */
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NVIC_Configuration();
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/* Configure the SysTick */
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RCC_Configuration();
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SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
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/* Initial usart deriver, and set console device */
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rt_hw_usart_init();
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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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/* Print RCC freq info */
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#ifdef PRINT_RCC_FREQ_INFO
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print_rcc_freq_info();
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#endif
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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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}
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/*@}*/
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