stm32f10x_usart.c

来自「STM32 USB HID」· C语言 代码 · 共 45 行

#include"stm32f10x_rcc.h"
#include"stm32f10x_gpio.h"
#include"stm32f10x_nvic.h"
//-----------------------------------------------------------------------------
#include"stm32f10x_usart.h"
//-----------------------------------------------------------------------------
void USART1_Configuration(void)
{
	//相应时钟使能
	RCC_APB2ENR_BITS[GPIOA_EN] =1;
	//相应引脚配置																	
	{	//复用功能(推挽)输出模式
		GPIOA_CRH_BITS[CNF9_1] =1;
		GPIOA_CRH_BITS[CNF9_0] =0;
		//最大速度50MHz
		GPIOA_CRH_BITS[MODE9_1]=1;
		GPIOA_CRH_BITS[MODE9_0]=1;
	}
																									
	//相应时钟使能
	RCC_APB2ENR_BITS[USART1_EN]=1;
	{	//USART_1
		USART1_BRR=0x00000271;	// 72M晶振
		{
			USART1_CR1_BITS[USART_EN]=1;
			USART1_CR1_BITS[RX_IE]   =1;
			USART1_CR1_BITS[TX_EN]   =1;
			USART1_CR1_BITS[RX_EN]   =1;
	 	}
	}

	//相应中断使能
	NVIC_SETENA1|=EN_UART1;
}
//-----------------------------------------------------------------------------
unsigned int usart1_command;
//-----------------------------------------------------------------------------
void USART1_IRQHandler(void);
//-----------------------------------------------------------------------------
void USART1_IRQHandler(void)
{ 
	if(USART1_SR_BITS[RX_NE])
		usart1_command=USART1_DR;
}