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楼主 |
发表于 2019-1-16 16:47:59
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这是485的初始化函数：
#include "sys.h"
#include "rs485.h"
#include "delay.h"
//////////////////////////////////////////////////////////////////////////////////
//±¾3ìDòÖ»1©Ñ§Ï°ê1óÃ￡¬Î′¾-×÷ÕßDí¿é￡¬2»μÃóÃóúÆäËüèÎoÎóÃí¾
//ALIENTEKÕ½½￠STM32¿a·￠°å
//RS485Çy¶ˉ ′úÂë
//ÕyμãÔ-×ó@ALIENTEK
//¼¼êõÂÛì3:www.openedv.com
//DT¸ÄèÕÆú:2012/9/9
//°æ±¾￡oV1.0
//°æè¨ËùóD￡¬μá°æ±Ø¾¿¡￡
//Copyright(C) 1ãÖYêDDÇòíμç×ó¿Æ¼¼óDÏT1«Ë¾ 2009-2019
//All rights reserved
//////////////////////////////////////////////////////////////////////////////////
#ifdef EN_USART2_RX //èç1ûê1Äüá˽óêÕ
//½óêÕ»o′æÇø
u8 RS485_RX_BUF[64]; //½óêÕ»o3å,×î′ó64¸ö×Ö½ú.
//½óêÕμ½μÄêy¾Y3¤¶è
u8 RS485_RX_CNT=0;
void USART2_IRQHandler(void)
{
u8 res;
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) //½óêÕμ½êy¾Y
{
res =USART_ReceiveData(USART2); //¶á衽óêÕμ½μÄêy¾Y
if(RS485_RX_CNT<64)
{
RS485_RX_BUF[RS485_RX_CNT]=res; //¼Ç¼½óêÕμ½μÄÖμ
RS485_RX_CNT++; //½óêÕêy¾YÔö¼ó1
}
}
}
#endif
//3õê¼»ˉIO ′®¿ú2
//pclk1 CLK1ê±ÖóÆμÂê(Mhz)
//bound:2¨ìØÂê
void RS485_Init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//ê1ÄüGPIOA,Dê±Öó
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);//ê1ÄüUSART2ê±Öó
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //PD7¶Ë¿úÅäÖÃ
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF_PP ; //íÆíìêä3ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA2
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF_PP ; //¸′óÃíÆíì
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //¸¡¿Õêäèë
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,ENABLE);//¸′λ′®¿ú2
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,DISABLE);//í￡Ö1¸′λ
#ifdef EN_USART2_RX //èç1ûê1Äüá˽óêÕ
USART_InitStructure.USART_BaudRate = bound;//2¨ìØÂêéèÖÃ
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//8λêy¾Y3¤¶è
USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí￡Ö1λ
USART_InitStructure.USART_Parity = USART_Parity_No;///ÆæżD￡Ñéλ
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//êÕ·￠Ä￡ê½
USART_Init(USART2, &USART_InitStructure); ; //3õê¼»ˉ′®¿ú
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; //ê1Äü′®¿ú2ÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; //ÏèÕ¼óÅÏ輶2¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //′óóÅÏ輶2¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //ê1Äüía2¿ÖD¶Ïí¨μà
NVIC_Init(&NVIC_InitStructure); //¸ù¾YNVIC_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèNVIC¼Ä′æÆ÷
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//¿aÆôÖD¶Ï
USART_Cmd(USART2, ENABLE); //ê1Äü′®¿ú
#endif
RS485_TX_EN=0; //ĬèÏÎa½óêÕÄ￡ê½
}
//RS485·￠Ëílen¸ö×Ö½ú.
//buf:·￠ËíÇøê×μØÖ·
//len:·￠ËíμÄ×Ö½úêy(ÎaáËoí±¾′úÂëμĽóêÕÆ￥Åä,Õaàｨòé2»òa3¬1y64¸ö×Ö½ú)
void RS485_Send_Data(u8 *buf,u8 len)
{
u8 t;
RS485_TX_EN=1; //éèÖÃÎa·￠ËíÄ￡ê½
for(t=0;t<len;t++) //Ñ-»··￠Ëíêy¾Y
{
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
USART_SendData(USART2,buf[t]);
}
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
RS485_RX_CNT=0;
RS485_TX_EN=0; //éèÖÃÎa½óêÕÄ￡ê½
}
//RS4852éÑˉ½óêÕμ½μÄêy¾Y
//buf:½óêÕ»o′æê×μØÖ·
//len:¶áμ½μÄêy¾Y3¤¶è
void RS485_Receive_Data(u8 *buf,u8 *len)
{
u8 rxlen=RS485_RX_CNT;
u8 i=0;
*len=0; //ĬèÏÎa0
delay_ms(10); //μè′y10ms,á¬Dø3¬1y10msûóD½óêÕμ½ò»¸öêy¾Y,ÔòèÏÎa½óêÕ½áêø
if(rxlen==RS485_RX_CNT&&rxlen)//½óêÕμ½áËêy¾Y,Çò½óêÕíê3éáË
{
for(i=0;i<rxlen;i++)
{
buf=RS485_RX_BUF;
}
*len=RS485_RX_CNT; //¼Ç¼±¾′Îêy¾Y3¤¶è
RS485_RX_CNT=0; //Çåáã
}
}
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发表于 2019-1-16 15:57:22
