分享模拟串口RS485代码【YS8156B氨气传感器等】MODBUS 协议（RTU 方式）

2019-07-20 01:35发布

本帖最后由 lengjingzju 于 2016-4-22 17:10 编辑

适用于某些工业级O2/CO2/NH3等测量传感器

///////////////
////crc16.c////
///////////////

//CRC16校验

const unsigned char auchCRCHi[] = {
      0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
      0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
      0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
      0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
      0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
      0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
      0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
      0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
      0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
      0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
      0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
      0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
      0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
      0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
      0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
      0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
      0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
      0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
      0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
      0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
      0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
      0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
      0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
      0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
      0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
      0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
} ;

const unsigned char auchCRCLo[] = {
      0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06,
      0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD,
      0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,
      0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A,
      0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4,
      0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
      0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3,
      0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4,
      0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A,
      0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29,
      0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED,
      0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
      0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60,
      0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67,
      0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F,
      0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68,
      0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E,
      0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
      0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71,
      0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92,
      0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,
      0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B,
      0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B,
      0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
      0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42,
      0x43, 0x83, 0x41, 0x81, 0x80, 0x40
} ;

unsigned short crc16(unsigned char *puchMsg, unsigned short usDataLen){
unsigned char uchCRCHi = 0xFF ;
unsigned char uchCRCLo = 0xFF ;
unsigned int uIndex ;

while (usDataLen--){
      uIndex = uchCRCHi ^ *puchMsg++ ;
      uchCRCHi = uchCRCLo ^ auchCRCHi[uIndex] ;
      uchCRCLo = auchCRCLo[uIndex] ;
}
return (uchCRCHi << 8 | uchCRCLo) ;
}

///////////////////
////CO2_RS485.h////
///////////////////

#ifndef __CO2_RS485_H
#define __CO2_RS485_H

#include "stm32f4xx_conf.h"
#include "sys.h"
#include "delay.h"
#include "usart.h"

//如果使用ucos,则包括下面的头文件即可.
#if SYSTEM_SUPPORT_OS
#include "includes.h"  //ucos 使用
#endif

#define CO2_RS485_RX       PAin(3)
#define CO2_RS485_TX       PAout(2)
#define CO2_RS485_TX_EN    PGout(8) //485模式控制.0,接收;1,发送.
#define BOUND_TIME_DIV2  52  //9600波特率延时为104us，可能需要修改，因为时钟选取的HSE的频率可能有偏移

extern u8 CO2_RS485_RX_BUF[7];    //接收缓冲,7个字节
extern u8 CO2_RS485_RX_LEN;    //接收到的数据长度

void CO2_RS485_init(void);
void CO2_RS485_sendInstruction(void);
void CO2_RS485_getOneByte(void);
u16  CO2_RS485_getValue(void);//实际值单位ppm(百万分之一)
unsigned short crc16(unsigned char *puchMsg, unsigned short usDataLen);

#endif

///////////////////
////CO2_RS485.c////
///////////////////

#include "CO2_RS485.h"
u8 CO2_RS485_RX_BUF[7];    //接收缓冲,7个字节
u8 CO2_RS485_RX_LEN=0;    //接收到的数据长度

void CO2_RS485_init(void){
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA |RCC_AHB1Periph_GPIOG,ENABLE);//使能GPIOK时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能SYSCFG时钟

//GPIO初始化
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_OUT;    //普通输出模式
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;    //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;  //100MHz
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;    //上拉
GPIO_Init(GPIOG, &GPIO_InitStructure);             //初始化

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_Init(GPIOA, &GPIO_InitStructure);             //初始化

//CO2_RS485_TX_EN=0;//设置为接收模式

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//普通输入模式
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化

//配置 GPIO 与中断线的映射关系
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource3);//PK3 连接到中断线3

//配置EXTI_Line3
EXTI_InitStructure.EXTI_Line = EXTI_Line3;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//中断事件
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//下降沿触发
EXTI_InitStructure.EXTI_LineCmd = ENABLE;//中断线使能
EXTI_Init(&EXTI_InitStructure);//配置

//配置中断分组（ NVIC），并使能中断
NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;//外部中断3
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;//抢占优先级2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;//子优先级2
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道
NVIC_Init(&NVIC_InitStructure);//配置

}

//已在头文件定义
//#define CO2_RS485_RX       PKin(3)
//#define BOUND_TIME_DIV2  52  //9600波特率延时为104us
//u8 CO2_RS485_RX_BUF[7];    //接收缓冲,7个字节
//u8 CO2_RS485_RX_LEN=0;    //接收到的数据长度
//外部中断3服务程序
//符合标准MODBUS 协议（RTU 方式），通讯波特率固定为9600，1个起始位，8个数据位，无效验位，1个停止位。//

void EXTI3_IRQHandler(void){

#if SYSTEM_SUPPORT_OS //如果SYSTEM_SUPPORT_OS为真，则需要支持OS.
OSIntEnter();
#endif
NVIC_DisableIRQ(EXTI3_IRQn);//中断除能

   CO2_RS485_getOneByte();

NVIC_EnableIRQ(EXTI3_IRQn);//中断使能
   EXTI_ClearITPendingBit(EXTI_Line3);//清除LINE3上的中断标志位

#if SYSTEM_SUPPORT_OS //如果SYSTEM_SUPPORT_OS为真，则需要支持OS.
OSIntExit();
#endif
}

//已在头文件定义
//#define CO2_RS485_RX       PKin(3)
//#define CO2_RS485_TX       PKout(4)
//#define CO2_RS485_TX_EN    PKout(5) //485模式控制.0,接收;1,发送.

void CO2_RS485_getOneByte(void){
u8 i;
delay_us(BOUND_TIME_DIV2);delay_us(BOUND_TIME_DIV2);
//8个数据位，低位在前

for(i=0;i<8;i++){
      delay_us(BOUND_TIME_DIV2);
      CO2_RS485_RX_BUF[CO2_RS485_RX_LEN] = (CO2_RS485_RX_BUF[CO2_RS485_RX_LEN] & (u8)(~(1<<i))) | (u8)CO2_RS485_RX<<i;
      //if(CO2_RS485_RX) buf=1;
      //else buf=0;
      delay_us(BOUND_TIME_DIV2);
}
//无奇偶校验位
//1个停止位
delay_us(BOUND_TIME_DIV2);delay_us(BOUND_TIME_DIV2);
CO2_RS485_RX_LEN++;
}

void CO2_RS485_sendInstruction(void){