/******************************************************************************
 * Copyright (C) 2014-2015 HangZhou SiZhu Co.,LTD.
 *
 *-----------------------------------------------------------------------------
 * File: 			    RS485.c
 * Description:		RS485 gpio config ,receive and send data code
 * Author:			  Lishoujian (867693272@qq.com)
 * Date:			    Jan 8, 2015
 *****************************************************************************/

/* ----------------------- Platform includes --------------------------------*/
#include "sys.h"		    
#include "rs485.h"	 
#include "delay.h"
#include "stm32f10x_dma.h"
RX_MODBUS_T	rs485_receive_g ; 

u8	share_sendbuf[SEND_MAX_NUM]={0};
/******************************************
 * func:    RS485_ioconfig
 * desc:    config gpio;initialize hardware interface of RS485
 * input:   USARTx - select which USART port to be initialized
 * output:  none
 * return:  none
 *****************************************/

void RS485_Usart_Init(uint32  system_BaudRate)
{  
		USART_InitTypeDef USART_InitStructure;
		DMA_InitTypeDef DMA_InitStructure; 
	
		RCC_APB2PeriphClockCmd(APB_GPIO_GROUP, ENABLE);
		RCC_APB1PeriphClockCmd(RCC_APB_Periph_UART , ENABLE);
		RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);	
			   
		USART_InitStructure.USART_BaudRate = system_BaudRate;
		USART_InitStructure.USART_WordLength = USART_WordLength_8b;//word length 8bit
		USART_InitStructure.USART_StopBits = USART_StopBits_1;//one stopbit
		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(UARTNUM, &USART_InitStructure); //initialize USART

		USART_Cmd(UARTNUM, ENABLE);   
		RS485_EN=0;
		///////////////////////
		/*DMA ½ÓÊÕ³õʼ»¯*/
		/*¿ªÆôDMAʱÖÓ*/
			
		DMA_DeInit(DMA_RS485_Channel); 
		
		/*ÉèÖÃDMAÔ´£º´®¿ÚÊý¾Ý¼Ä´æÆ÷µØÖ·*/
		DMA_InitStructure.DMA_PeripheralBaseAddr =(u32)(&(UARTNUM->DR)) ;	   

		/*ÄÚ´æµØÖ·(Òª´«ÊäµÄ±äÁ¿µÄÖ¸Õë)*/
		DMA_InitStructure.DMA_MemoryBaseAddr = (u32)(rs485_receive_g.RS485_BUF);

		/*·½Ïò£º´ÓË«Ïòµ½ÄÚ´æ*/		
		DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;	

		/*´«Êä´óСDMA_BufferSize=SENDBUFF_SIZE*/	
		DMA_InitStructure.DMA_BufferSize = REC_LENGTH;

		/*ÍâÉèµØÖ·²»Ôö*/	    
		DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; 

		/*ÄÚ´æµØÖ·×ÔÔö*/
		DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;	

		/*ÍâÉèÊý¾Ýµ¥Î»*/	
		DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;

		/*ÄÚ´æÊý¾Ýµ¥Î» 8bit*/
		DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;	 

		/*DMAģʽ£º²»¶ÏÑ­»·*/
		//DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;
		DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;	 

		/*ÓÅÏȼ¶£ºÖÐ*/	
		DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;  

		/*½ûÖ¹ÄÚ´æµ½ÄÚ´æµÄ´«Êä	*/
		DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

			   
		DMA_Init(DMA_RS485_Channel, &DMA_InitStructure); 
			
		USART_DMACmd(UARTNUM, USART_DMAReq_Rx, ENABLE); 

		
		DMA_Cmd(DMA_RS485_Channel, ENABLE);


}

void RS485_TXDMA_Init(u8 *data,u32 lenth)	
{
		DMA_InitTypeDef DMA_InitStructure;
    NVIC_InitTypeDef  NVIC_InitStructure; 
    DMA_DeInit(DMA_RS485_TX_Channel); 
		
		/*ÉèÖÃDMAÔ´£º´®¿ÚÊý¾Ý¼Ä´æÆ÷µØÖ·*/
		DMA_InitStructure.DMA_PeripheralBaseAddr =(u32)(&(UARTNUM->DR)) ;	   

		/*ÄÚ´æµØÖ·(Òª´«ÊäµÄ±äÁ¿µÄÖ¸Õë)*/
		DMA_InitStructure.DMA_MemoryBaseAddr = (u32)(data);

		/*·½Ïò£º´ÓË«Ïòµ½ÄÚ´æ*/		
		DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;	

		/*´«Êä´óСDMA_BufferSize=SENDBUFF_SIZE*/	
		DMA_InitStructure.DMA_BufferSize = lenth;

		/*ÍâÉèµØÖ·²»Ôö*/	    
		DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; 

		/*ÄÚ´æµØÖ·×ÔÔö*/
		DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;	

		/*ÍâÉèÊý¾Ýµ¥Î»*/	
		DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;

		/*ÄÚ´æÊý¾Ýµ¥Î» 8bit*/
		DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;	 

		/*DMAģʽ£º²»¶ÏÑ­»·*/
		DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;
	//	DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;	 

		/*ÓÅÏȼ¶£ºÖÐ*/	
		DMA_InitStructure.DMA_Priority = DMA_Priority_High;  

		/*½ûÖ¹ÄÚ´æµ½ÄÚ´æµÄ´«Êä	*/
		DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

			   
		DMA_Init(DMA_RS485_TX_Channel, &DMA_InitStructure); 
			
		USART_DMACmd(UARTNUM, USART_DMAReq_Tx, ENABLE); 	
	
//	  DMA_ITConfig(DMA2_Channel5,DMA_IT_TC, ENABLE);

            
//		 NVIC_InitStructure.NVIC_IRQChannel= DMA2_Channel4_5_IRQn;   
//		 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 2;   
//		 NVIC_InitStructure.NVIC_IRQChannelSubPriority= 1;   
//		 NVIC_InitStructure.NVIC_IRQChannelCmd= ENABLE;   
//		 NVIC_Init(&NVIC_InitStructure);  

}
/******************************************
 * func:    RS485_Send_Data
 * desc:    send data by RS485
 * input:   USARTx - select USART port , buf - send buffer , len - data length
 * output:  none
 * return:  none
 *****************************************/
void RS485_Send_Data(uint8 *buf,uint16 len)
{
	uint16 t;
     
	RS485_EN = 1;   //send mode

			
 	for(t=0;t<len;t++)		  //send data
	{		   
		while(USART_GetFlagStatus(UARTNUM, USART_FLAG_TC) == RESET);	  
		USART_SendData(UARTNUM,buf[t]);
	}	 
 
	while(USART_GetFlagStatus(UARTNUM, USART_FLAG_TC) == RESET);		
	RS485_EN = 0;

}

/******************************************
 * func:    RS485_Receive_Data
 * desc:    get received data from RS485
 * input:   buf - receive buffer,len - data length
 * output:  none
 * return:  none
 *****************************************/

void RS485_Receive_Data(uint8 * recbuf, uint8 *rec485buffer, uint8 len)
{
	uint8 i=0;
				              
	//delay_ms(10);	               	
	
	for(i = 0;i < len;i ++)
	{
		recbuf[i] = rec485buffer[i];	
	}		

}


void DMA2_Channel4_5_IRQHandler(void)
{
	DMA_ClearFlag(DMA2_FLAG_TC5);
	DMA_Cmd(DMA_RS485_TX_Channel, DISABLE);
	
	delay_us(300);
	
   RS485_EN = 0;
}

//======================================================================================
// ´®¿Ú·¢Ë͵÷ÊÔÐÅÏ¢   RS485·¢Ë͵÷ÊÔÐÅÏ¢
void UartDebugFun(char *str)
{
	unsigned char len ;
//	unsigned char i ;
	
  RS485_EN=1;
	
	len = strlen(str);  //¼ÆËãµ÷ÊÔÐÅÏ¢µÄ³¤¶È
// 	for(i=0;i<len;i++)
// 	{
// 		Uart4SendByte(USART3,*str);
// 		str ++ ;	
// 	}
	RS485_Send_Data((u8 * )str,len);
	delay_ms(1);
		
	RS485_EN=0;
}