GeekIMU/2.Firmware/STM32/Firmware/system/usart/usart.c

/******************** (C) COPYRIGHT 2020 GEEKIMU *******************************
* File Name          : usart.c
* Current Version    : V2.0  & ST 3.5.0
* Author             : zhanli 719901725@qq.com & JustFeng.
* Date of Issued     : 2019.5.26 zhanli : Create
* Comments           : STM32 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>     
********************************************************************************/
#include "sys.h"
#include "usart.h"	  
#include "stm32f10x_gpio.h"
#include "stm32f10x_usart.h"
#include "stm32f10x_rcc.h"

#if 1

#pragma import(__use_no_semihosting)             
//<2F><>׼<EFBFBD><D7BC><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA>֧<EFBFBD>ֺ<EFBFBD><D6BA><EFBFBD>                 
struct __FILE { 
	int handle; 
}; 

FILE __stdout;       
//<2F><><EFBFBD><EFBFBD>_sys_exit()<29>Ա<EFBFBD><D4B1><EFBFBD>ʹ<EFBFBD>ð<EFBFBD><C3B0><EFBFBD><EFBFBD><EFBFBD>ģʽ    
_sys_exit(int x) 
{ 
	x = x; 
} 
//<2F>ض<EFBFBD><D8B6><EFBFBD>fputc<74><63><EFBFBD><EFBFBD> 
int fputc(int ch, FILE *f)
{      
	while((USART1->SR&0X40)==0);//ѭ<><D1AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>,ֱ<><D6B1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>   
    USART1->DR = (u8) ch;      
	return ch;
}
#endif 

#if EN_USART1_RX                    //<2F><><EFBFBD><EFBFBD>ʹ<EFBFBD><CAB9><EFBFBD>˽<EFBFBD><CBBD><EFBFBD>
//ע<><D7A2>,<2C><>ȡUSARTx->SR<53>ܱ<EFBFBD><DCB1><EFBFBD>Ī<EFBFBD><C4AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><C4B4><EFBFBD>   	
u8 USART_RX_BUF[USART_REC_LEN];     //<2F><><EFBFBD>ջ<EFBFBD><D5BB><EFBFBD>,<2C><><EFBFBD><EFBFBD>USART_REC_LEN<45><4E><EFBFBD>ֽ<EFBFBD>.
//<2F><><EFBFBD><EFBFBD>״̬
//bit15<31><35>	<09><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɱ<EFBFBD>־
//bit14<31><34>	<09><><EFBFBD>յ<EFBFBD>0x0d
//bit13~0<><30>	<09><><EFBFBD>յ<EFBFBD><D5B5><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>ֽ<EFBFBD><D6BD><EFBFBD>Ŀ

u16 USART_RX_STA = 0;       //<2F><><EFBFBD><EFBFBD>״̬<D7B4><CCAC><EFBFBD><EFBFBD>	  

/**----------------------------------------------------------------------
* Function    : uart_init
* Description : STM32 <EFBFBD><EFBFBD><EFBFBD><EFBFBD>1<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* Input       : bound : <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* Author      : zhanli&719901725@qq.com
* Date        : 2019/5/26 zhanli
*---------------------------------------------------------------------**/
void uart_init(u32 bound){
	
	//GPIO<49>˿<EFBFBD><CBBF><EFBFBD><EFBFBD><EFBFBD>
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	
	// ʹ<><CAB9>USART1<54><31>GPIOAʱ<41><CAB1>
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
	// <20><>λ<EFBFBD><CEBB><EFBFBD><EFBFBD>1
	USART_DeInit(USART1);  
	
	// USART1_TX PA.9 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	
	GPIO_Init(GPIOA, &GPIO_InitStructure); 

	// USART1_RX PA.10 <20><><EFBFBD>ø<EFBFBD><C3B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
	GPIO_Init(GPIOA, &GPIO_InitStructure);  

	// USART <20><>ʼ<EFBFBD><CABC>,һ<><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ9600;
	USART_InitStructure.USART_BaudRate = bound;
	// <20>ֳ<EFBFBD>Ϊ8λ<38><CEBB><EFBFBD>ݸ<EFBFBD>ʽ
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	// һ<><D2BB>ֹͣλ
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	// <20><><EFBFBD><EFBFBD>żУ<C5BC><D0A3>λ
	USART_InitStructure.USART_Parity = USART_Parity_No;
	// <20><>Ӳ<EFBFBD><D3B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	//<2F>շ<EFBFBD>ģʽ

	// <20><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	USART_Init(USART1, &USART_InitStructure); 
	// <20><><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>
	USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
	// ʹ<>ܴ<EFBFBD><DCB4><EFBFBD> 
	USART_Cmd(USART1, ENABLE);                   

}

/**----------------------------------------------------------------------
* Function    : USART1_IRQHandler
* Description : <EFBFBD><EFBFBD><EFBFBD><EFBFBD>1<EFBFBD>жϷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* Author      : zhanli&719901725@qq.com
* Date        : 2019/5/26 zhanli
*---------------------------------------------------------------------**/
void USART1_IRQHandler(void)
{
	u8 Res;
	//<2F><><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>(<28><><EFBFBD>յ<EFBFBD><D5B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݱ<EFBFBD><DDB1><EFBFBD><EFBFBD><EFBFBD>0x0d 0x0a<30><61>β)
	if(USART_GetITStatus(USART1, USART_IT_RXNE) == RESET)
		return;

	// <20><>ȡ<EFBFBD><C8A1><EFBFBD>յ<EFBFBD><D5B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	Res = USART_ReceiveData(USART1);	
	
	// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	if((USART_RX_STA & 0x8000) != 0)
		return;
	
	//<2F><><EFBFBD>յ<EFBFBD><D5B5><EFBFBD>0x0d
	if(USART_RX_STA & 0x4000)
	{
		if(Res!=0x0a)USART_RX_STA=0;//<2F><><EFBFBD>մ<EFBFBD><D5B4><EFBFBD>,<2C><><EFBFBD>¿<EFBFBD>ʼ
		else USART_RX_STA|=0x8000;	//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 
	}else //<2F><>û<EFBFBD>յ<EFBFBD>0X0D
	{	
		if(Res==0x0d)USART_RX_STA|=0x4000;
		else{
			USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
			USART_RX_STA++;
			// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݴ<EFBFBD><DDB4><EFBFBD>,<2C><><EFBFBD>¿<EFBFBD>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD>	
			if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;  
		}		 
	}
} 

#endif