#include "dev.h"
#include "usart.h"	
#include "timer.h"
#include "delay.h"

//加入以下代码,支持printf函数,而不需要选择use MicroLIB	  
#if 11
#pragma import(__use_no_semihosting)             
//标准库需要的支持函数                 
struct __FILE 
{ 
	int handle; 
}; 

FILE __stdout;       
//定义_sys_exit()以避免使用半主机模式    
void _sys_exit(int x) 
{ 
	x = x; 
} 

#endif
int fputc(int ch, FILE *f)		//重定义fputc函数 
{ 	
	while((USART1->SR&0X40)==0);//循环发送,直到发送完毕   
	USART1->DR = (uint8_t) ch;      
	return ch;
}
 



void USART1_Config(uint32_t bound)
{
	GPIO_InitTypeDef 	GPIO_InitStructure;
	USART_InitTypeDef 	USART_InitStructure;
	NVIC_InitTypeDef 	NVIC_InitStructure;
	
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); 			//使能GPIOA时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);			//使能USART1时钟
 
	GPIO_PinAFConfig(DBG_RXD_Port,GPIO_PinSource9,GPIO_AF_USART1); 	//GPIOA9复用为USART1
	GPIO_PinAFConfig(DBG_TXD_Port,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10复用为USART1

	GPIO_InitStructure.GPIO_Pin 	= DBG_RXD_Pin | DBG_TXD_Pin; 	//GPIOA9与GPIOA10
	GPIO_InitStructure.GPIO_Mode 	= GPIO_Mode_AF;					//复用功能
	GPIO_InitStructure.GPIO_Speed 	= GPIO_Speed_50MHz;				//速度50MHz
	GPIO_InitStructure.GPIO_OType 	= GPIO_OType_PP; 				//推挽复用输出
	GPIO_InitStructure.GPIO_PuPd 	= GPIO_PuPd_UP; 				//上拉
	GPIO_Init(DBG_RXD_Port,&GPIO_InitStructure); 					//初始化
	
	USART_InitStructure.USART_BaudRate 		= bound;				//波特率设置
	USART_InitStructure.USART_WordLength	= USART_WordLength_8b;	//字长为8位数据格式
	USART_InitStructure.USART_StopBits 		= USART_StopBits_1;		//一个停止位
	USART_InitStructure.USART_Parity 		= USART_Parity_No;		//无奇偶校验位
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
	USART_InitStructure.USART_Mode 			= USART_Mode_Rx | USART_Mode_Tx;	//收发模式
	USART_Init(USART1, &USART_InitStructure); 						//初始化串口1
	
	USART_Cmd(USART1, ENABLE);  									//使能串口1 
	
	USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);					//开启相关中断

	NVIC_InitStructure.NVIC_IRQChannel 					= USART1_IRQn;	//串口1中断通道
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 3;		//抢占优先级3
	NVIC_InitStructure.NVIC_IRQChannelSubPriority 		= 0;		//子优先级3
	NVIC_InitStructure.NVIC_IRQChannelCmd 				= ENABLE;	//IRQ通道使能
	NVIC_Init(&NVIC_InitStructure);									//初始化VIC寄存器	
}




/****************************************************
*@brief:	串口5配置
*@param:	uart		串口指针
*			bound		串口波特率
*@retval：	无返回值			
*****************************************************/
void UART5_Config(uint32_t bound)
{
	GPIO_InitTypeDef 	GPIO_InitStructure;
	USART_InitTypeDef 	USART_InitStructure;
	NVIC_InitTypeDef 	NVIC_InitStructure;
	
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD,ENABLE); 
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5,ENABLE);	

	GPIO_PinAFConfig(U485_RX_Port,GPIO_PinSource2,GPIO_AF_UART5); 
	GPIO_PinAFConfig(U485_TX_Port,GPIO_PinSource12,GPIO_AF_UART5); 
	
	GPIO_InitStructure.GPIO_Pin 	= U485_RX_Pin; 
	GPIO_InitStructure.GPIO_Mode 	= GPIO_Mode_AF;			
	GPIO_InitStructure.GPIO_Speed 	= GPIO_Speed_50MHz;		
	GPIO_InitStructure.GPIO_OType 	= GPIO_OType_PP; 		
	GPIO_InitStructure.GPIO_PuPd 	= GPIO_PuPd_UP; 		
	GPIO_Init(U485_RX_Port,&GPIO_InitStructure); 					
	
	GPIO_InitStructure.GPIO_Pin 	= U485_TX_Pin; 
	GPIO_InitStructure.GPIO_Mode 	= GPIO_Mode_AF;			
	GPIO_InitStructure.GPIO_Speed 	= GPIO_Speed_50MHz;		
	GPIO_InitStructure.GPIO_OType 	= GPIO_OType_PP; 		
	GPIO_InitStructure.GPIO_PuPd 	= GPIO_PuPd_UP; 		
	GPIO_Init(U485_TX_Port,&GPIO_InitStructure); 
	
	GPIO_InitStructure.GPIO_Pin 	= EN_485_Pin; 
	GPIO_InitStructure.GPIO_Mode 	= GPIO_Mode_OUT;			
	GPIO_InitStructure.GPIO_Speed 	= GPIO_Speed_50MHz;		
	GPIO_InitStructure.GPIO_OType 	= GPIO_OType_PP; 		
	GPIO_InitStructure.GPIO_PuPd 	= GPIO_PuPd_UP; 		
	GPIO_Init(EN_485_Port,&GPIO_InitStructure); 
	
	UART5_Mode(RS485_READ);
	
	USART_InitStructure.USART_BaudRate 				= bound;				
	USART_InitStructure.USART_WordLength			= USART_WordLength_8b;	
	USART_InitStructure.USART_StopBits 				= USART_StopBits_1;		
	USART_InitStructure.USART_Parity 				= USART_Parity_No;		
	USART_InitStructure.USART_HardwareFlowControl 	= USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode 					= USART_Mode_Rx | USART_Mode_Tx;	
	USART_Init(UART5, &USART_InitStructure); 
	
	USART_Cmd(UART5, ENABLE);  
	
	USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);

	NVIC_InitStructure.NVIC_IRQChannel 					 = UART5_IRQn;	
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 5;			
	NVIC_InitStructure.NVIC_IRQChannelSubPriority 		 = 0;			
	NVIC_InitStructure.NVIC_IRQChannelCmd 				 = ENABLE;		
	NVIC_Init(&NVIC_InitStructure);	
}




u32		UART_RX_CNT						= 0;
u8  	UART_RX_BUF[USART_REC_LEN]		__attribute__ ((at(SRAM_EXT_ADDR)));	//EXTI SRAM 200k
void	UART5_IRQHandler(void)
{
	if(USART_GetITStatus(UART5,USART_IT_RXNE) != RESET)	
	{
		UART_RX_BUF[UART_RX_CNT++] = UART5->DR;
		TIM3->CNT = 0;
		
		TIM_Cmd(TIM3,ENABLE);
		
		if(UART_RX_CNT == USART_REC_LEN)			//防止溢出
		{
			UART_RX_CNT = 0;
		}
	}
	USART_ClearITPendingBit(UART5, USART_IT_RXNE);
}



void UART5_Mode(mode status)
{
	if(status == RS485_WRITE)
	{
		GPIO_SetBits(EN_485_Port,EN_485_Pin);
	}
	else if(status == RS485_READ)
	{
		GPIO_ResetBits(EN_485_Port,EN_485_Pin);
	}
}






/***************************
*
*
*
****************************/
void Clear_Uart5_Cache(void)
{
	memset(UART_RX_BUF,0,UART_RX_CNT);
	UART_RX_CNT = 0;
}



void Uart5_Send(uint8_t *data,uint16_t length)
{
	UART5_Mode(RS485_WRITE);
	Tick_Delay_ms(1);
	uint8_t 	i ; 
	
	for(i=0;i<length;i++)
	{
		USART_SendData(UART5,data[i]);
		while((UART5->SR&0X40)==0);
	}
	
	Tick_Delay_ms(1);
	UART5_Mode(RS485_READ);
}





#if 1
void USART1_IRQHandler(void)                	//串口1中断服务程序
{

	USART_ClearITPendingBit(USART1, USART_IT_RXNE);
} 
#endif