pic32單片機RS485通信程序

ID:401765 · 發(fā)表于 2018-9-24 11:11

pic32單片機485通信程序分享給大家

pic32源程序如下:

/********************************************************************************************************
*********************************************************************************************************
*
* File : RS485.c
* Hardware Environment: easyPIC pro v2
* Build Environment : MPLAB V8.66 + PIC32 V2.01
* Microcontroller : PIC32MX795F512L
* Version : V1.0
* By : JEFF
* DATE : 20150320
*
* Hardware Connection：
CN5(0~5)-----RB8~RB13, Segment LED Connetion
CN6(0~7)-----RD0~RD7
RE/DE------RB15
RO ------RF4
DI ------RF5
*
*(c) Copyright 2010-2018, Logifind Tech CO.,LTD
*http://www.logifind.com
*All Rights Reserved
*
*********************************************************************************************************
********************************************************************************************************/
//
// 實驗描述：串口助手發(fā)送數(shù)據(jù),接收16 Byte數(shù)據(jù),RS485 發(fā)出16Byte數(shù)據(jù)
// LED及數(shù)碼管顯示緩沖區(qū)數(shù)據(jù).
//
// 頭文件：C:\Program Files\Microchip\MPLAB C32 Suite\pic32-libs\include\proc
//
// 配置位：菜單欄 -> Help -> Topics.. -> PIC32MX Config Setting
//
// 波特率：9600 N 8 1
//
// 注意事項：每次必須累積 16Byte 數(shù)據(jù),單片機才回傳數(shù)據(jù)
//
//-------------------------------------------------------------------------------
#include <plib.h> //調(diào)用通用頭文件
//-------------------------------------------------------------------------------
// POSCMOD = XT, FNOSC = PRIPLL, FWDTEN = OFF
// PLLIDIV = DIV_2, PLLMUL = MUL_20
// PBDIV = 4 (default)
// Main clock = 4MHz /2 * 20 = 40MHz
// Peripheral clock = 40MHz /4 = 10MHz
// SYSCLK = 40 MHz (4MHz Crystal/FPLLIDIV * FPLLMUL / FPLLODIV)
// PBCLK = 10 MHz
#pragma config POSCMOD = XT //主振蕩器
#pragma config FNOSC = PRIPLL //倍頻模式
#pragma config FPLLIDIV = DIV_2 //輸入分頻 1:2
#pragma config FPLLMUL = MUL_20 //PPL 倍頻 1:20
#pragma config FPLLODIV = DIV_1 //輸出分頻 1:1
#pragma config FPBDIV = DIV_4 //外設(shè)時鐘
#pragma config FWDTEN = OFF //關(guān)閉看門狗
//#pragma config ICESEL = ICS_PGx1 //調(diào)試端口1
#pragma config ICESEL = ICS_PGx2 //調(diào)試端口2
#define SysLED _LATB5 //CPU LED
#define SPEKAK _LATD8 //蜂嗚器
#define RELAY _LATD8 //繼電器
#define bctl_485 _LATB15 //485控制端
#define Smg_a 0xFE //定義段碼
#define Smg_b 0xFD
#define Smg_c 0xFB
#define Smg_d 0xF7
#define Smg_e 0xEF
#define Smg_f 0xDF
#define Smg_g 0xBF
#define Smg_dp 0x7F
#define Bmp0Map Smg_a & Smg_b & Smg_c & Smg_d & Smg_e & Smg_f
#define Bmp1Map Smg_b & Smg_c
#define Bmp2Map Smg_a & Smg_b & Smg_d & Smg_e & Smg_g
#define Bmp3Map Smg_a & Smg_b & Smg_c & Smg_d & Smg_g
#define Bmp4Map Smg_b & Smg_c & Smg_f & Smg_g
#define Bmp5Map Smg_a & Smg_c & Smg_d & Smg_f & Smg_g
#define Bmp6Map Smg_a & Smg_c & Smg_d & Smg_e & Smg_f & Smg_g
#define Bmp7Map Smg_a & Smg_b & Smg_c
#define Bmp8Map Smg_a & Smg_b & Smg_c & Smg_d & Smg_e & Smg_f & Smg_g
#define Bmp9Map Smg_a & Smg_b & Smg_c & Smg_d & Smg_f & Smg_g
#define BmpAMap Smg_a & Smg_b & Smg_c & Smg_e & Smg_f & Smg_g
#define BmpBMap Smg_c & Smg_d & Smg_e & Smg_f & Smg_g
#define BmpCMap Smg_a & Smg_d & Smg_e & Smg_f
#define BmpDMap Smg_b & Smg_c & Smg_d & Smg_e & Smg_g
#define BmpEMap Smg_a & Smg_d & Smg_e & Smg_f & Smg_g
#define BmpFMap Smg_a & Smg_e & Smg_f & Smg_g
const unsigned char SegCode[] = //顯示段碼表
{
Bmp0Map,Bmp1Map,Bmp2Map,Bmp3Map,Bmp4Map,Bmp5Map,Bmp6Map,Bmp7Map,
Bmp8Map,Bmp9Map,BmpAMap,BmpBMap,BmpCMap,BmpDMap,BmpEMap,BmpFMap
};
unsigned char DpyNum[6] = {Smg_g,Smg_g,Smg_g,Smg_g,Smg_g,Smg_g}; //顯示緩沖區(qū)
unsigned char RxBuffer[16] = {0,0,0,0}; //串口接收緩沖區(qū)
unsigned char SysTick = 0; //系統(tǒng)時基
unsigned char COM2_RecvCnt = 0; //計數(shù)清零
unsigned char COM2_RecvFlag = 0; //接收標志
unsigned char COM2_SendDatCnt = 0; //發(fā)送計數(shù)
unsigned char COM2_SendDatLength = 0; //發(fā)送長度
//-------------------------------------------------------------------------------
// 延時函數(shù)
//-------------------------------------------------------------------------------
void Delay_xmS(unsigned int i)
{
unsigned int j;
for(;i>0;i--)
{
Nop();
for(j=0;j<255;j++)
{
Nop();
ClearWDT();
}
}
}
//-------------------------------------------------------------------------------
// 串口2初始化函數(shù)
//-------------------------------------------------------------------------------
void UART2_Init(void)
{
bctl_485 = 0; // 接收模式
U2MODEbits.SIDL = 0; // IDLE工作
U2MODEbits.IREN = 0; // 禁止IrDA
U2MODEbits.UEN = 0; // 使能RX TX引腳
U2MODEbits.WAKE = 0; // 禁止喚醒
U2MODEbits.ABAUD = 0; // 禁止自動BUD
U2MODEbits.RXINV = 0; // 空閑狀態(tài)為1
U2MODEbits.BRGH = 0; // 16x標準波特率
U2MODEbits.PDSEL = 0; // 8位無奇偶校驗
U2MODEbits.STSEL = 0; // 1個停止位
U2STAbits.ADM_EN = 0; // 關(guān)自動地址檢測
U2STAbits.UTXISEL1 = 0; // 發(fā)送完所有字符后中斷
U2STAbits.UTXISEL0 = 1;
U2STAbits.UTXINV = 0; // 空閑狀態(tài)為1
U2STAbits.URXEN = 1; // 接收器使能
U2STAbits.UTXBRK = 0; // 禁止發(fā)送間隔位
U2STAbits.UTXEN = 1; // 發(fā)送器使能
U2STAbits.URXISEL1 = 0; // 接收1個字符中斷
U2STAbits.URXISEL0 = 0;
U2BRG = 64; // PBCLK 10MHz N 8 1 9600 BRG = 64;
IPC8bits.U2IP = 4; // 主優(yōu)選級
IPC8bits.U2IS = 1; // 次優(yōu)選級
IEC1bits.U2RXIE = 1; // 接收中斷
IEC1bits.U2TXIE = 0; // 發(fā)送中斷
U2MODEbits.ON = 1; // 串口使能
}
//-------------------------------------------------------------------------------
// 串口2中斷函數(shù) 注意中斷編號
//-------------------------------------------------------------------------------
void __attribute__((vector(32)))__attribute__((interrupt(IPL4)))_UART2Interrupt(void)
{
if(IFS1bits.U2RXIF == 1) //接收中斷
{
RxBuffer[COM2_RecvCnt++] = U2RXREG; //儲存
if(COM2_RecvCnt == 16) //接收計數(shù)
{
COM2_RecvCnt = 0;
COM2_RecvFlag = 1;
}
IFS1bits.U2RXIF = 0;
}
if(IFS1bits.U2TXIF & IEC1bits.U2TXIE) //發(fā)送中斷
{
IFS1bits.U2TXIF = 0; //清中斷標志
if(COM2_SendDatCnt != COM2_SendDatLength) //發(fā)送未完成?
{
U2TXREG = RxBuffer[COM2_SendDatCnt++]; //裝載數(shù)數(shù)據(jù)
}
else //發(fā)送完成
{
if(U2STAbits.TRMT == 1) //移位寄存器空
{
bctl_485 = 0; //接收模式
IEC1bits.U2TXIE = 0; //禁止中斷
}
}
}
}
//---------------------------------------------------------------------------------
// TMR1初始化
//---------------------------------------------------------------------------------
void Timer1_Init(void)
{
T1CON = 0; // Timer1 清零
IFS0bits.T1IF = 0; // Timer1 清除標志位
IEC0bits.T1IE = 1; // Timer1 中斷允許
IPC1bits.T1IP = 4; // Timer1 中斷優(yōu)選級
IPC1bits.T1IS = 1; // Timer1 次優(yōu)選級
TMR1= 0x0000; // Timer1 給定初值
PR1 = 0x9C3F; // Timer1 周期寄存器
T1CONbits.TON = 1; // Timer1 啟動計數(shù)
}
//---------------------------------------------------------------------------------
// 數(shù)碼管驅(qū)動
//---------------------------------------------------------------------------------
void SegDisplay(void)
{
static unsigned char step = 0;
LATD = (LATD&0xFF00)|DpyNum[step]; //顯示緩沖
switch(step) //片選
{
case 0: _LATB8 = 0;_LATB9 = 1;_LATB10 = 1;_LATB11 = 1;_LATB12 = 1;_LATB13 = 1;break;
case 1: _LATB8 = 1;_LATB9 = 0;_LATB10 = 1;_LATB11 = 1;_LATB12 = 1;_LATB13 = 1;break;
case 2: _LATB8 = 1;_LATB9 = 1;_LATB10 = 0;_LATB11 = 1;_LATB12 = 1;_LATB13 = 1;break;
case 3: _LATB8 = 1;_LATB9 = 1;_LATB10 = 1;_LATB11 = 0;_LATB12 = 1;_LATB13 = 1;break;
case 4: _LATB8 = 1;_LATB9 = 1;_LATB10 = 1;_LATB11 = 1;_LATB12 = 0;_LATB13 = 1;break;
case 5: _LATB8 = 1;_LATB9 = 1;_LATB10 = 1;_LATB11 = 1;_LATB12 = 1;_LATB13 = 0;break;
default:break;
}
if(step < 5) step ++; //掃描
else step = 0;
}
//---------------------------------------------------------------------------------
// TMR1 中斷函數(shù)
//---------------------------------------------------------------------------------
void __attribute__ ((vector(4)))__attribute__((interrupt(IPL4)))_T1Interrupt(void)
{
IFS0bits.T1IF = 0;
SegDisplay(); //數(shù)碼管掃描
SysTick = 1; //系統(tǒng) Tick
}
//---------------------------------------------------------------------------------
// 主函數(shù)
//---------------------------------------------------------------------------------
int main(void)
{
unsigned char temp = 0; //臨時變量
unsigned char Delay = 0;
AD1PCFG = 0xFFFF; //引腳為數(shù)字I/O
TRISB = 0x40DF; //RB5 RB8-RB13輸出
TRISG = 0xFFFF; //G端口輸出
TRISE = 0x0000; //E端口輸出
TRISD = 0xFE00; //RD0-RD7 RD8 輸出
LATD = 0x00FF; //關(guān)閉蜂嗚器
Timer1_Init(); //TMR1初始化
UART2_Init(); //UART初始化
INTEnableSystemMultiVectoredInt(); //使能中斷多向量表
LATE = 0x00FF; //點亮 D0 - D7
Delay_xmS(400);
LATE = 0x0000; //關(guān)閉 D0 - D7
Delay_xmS(400);
LATE = 0x00FF; //點亮 D0 - D7
Delay_xmS(400);
LATE = 0x0000; //關(guān)閉 D0 - D7
Delay_xmS(200);
while(1)
{
//----------------------LCD顯示-------------------------
if(COM2_RecvFlag == 1)
{
bctl_485 = 1; //發(fā)送模式
COM2_RecvFlag = 0; //清標志
COM2_SendDatCnt = 0; //準備發(fā)送
COM2_SendDatLength = 16; //數(shù)據(jù)長度
IEC1bits.U2TXIE = 1; //啟動發(fā)送
}
if(SysTick == 1) //系統(tǒng)顯示延時
{
SysTick = 0;
Delay ++;
}
if(Delay > 120) //刷新顯示
{
Delay = 0;
DpyNum[0] = SegCode[temp/10]; //LCD 分段
DpyNum[1] = SegCode[temp%10];
DpyNum[2] = Smg_g;
DpyNum[3] = Smg_g;
DpyNum[4] = SegCode[RxBuffer[temp]>>4]; //顯示接收數(shù)據(jù)高4位
DpyNum[5] = SegCode[RxBuffer[temp]&0x0F]; //顯示接收數(shù)據(jù)低4位
LATE = RxBuffer[temp]; //LED顯示當(dāng)前數(shù)據(jù)
temp = (temp + 1)&0x0F; //循環(huán)顯示
SysLED = !SysLED; //CPU LED
}
//------------------------------------------------------
}
}
//---------------------------------------------------------------------------------

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RS485.rar (163.55 KB, 下載次數(shù): 38)

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