|
/******************************************************************************
|
* 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;
|
}
|
