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