單片機485通訊的問題只能接收到第一次的數據

ID:226167 · 發表于 2017-11-11 10:43

MCU 用STC15W408AS,接 MAX485，測試485通訊，有 RX_Buffer緩存。
在接收端設置接收數組。只能接收到第一次的數據，后續再次發生送，好像是不接收？
具體原因不詳。測試ing，還請大神指導

// 代碼

/******************************************
***
*PROJICT CODE: STC15
*CREATE DATE : 2017/10/30
*CREATED BY : Chneg
*FUNCTION :
*MODIFY DATE :
*DOCUMENT :
*OTHERS :
******************************************
***/
#include "main.h"
/************* 本地函數聲明 **************/
/************* 外部函數和變量聲明 *****************/
/************* 串口1初始化函數 *****************/
void UART_config(void)
{
COMx_InitDefine COMx_InitStructure; //結構定義
COMx_InitStructure.UART_Mode = UART_8bit_BRTx; //模式, UART_ShiftRight,UART_8bit_BRTx,UART_9bit,UART_9bit_BRTx
COMx_InitStructure.UART_BRT_Use = BRT_Timer2; //使用波特率, BRT_Timer1, BRT_Timer2 (注意: 串口2固定使用BRT_Timer2)
COMx_InitStructure.UART_BaudRate = 9600ul; //波特率, 一般 110 ~ 115200
COMx_InitStructure.UART_RxEnable = ENABLE; //接收允許, ENABLE或DISABLE
COMx_InitStructure.BaudRateDouble = DISABLE; //波特率加倍, ENABLE或DISABLE
COMx_InitStructure.UART_Interrupt = ENABLE; //中斷允許, ENABLE或DISABLE
COMx_InitStructure.UART_Polity = PolityLow; //中斷優先級, PolityLow,PolityHigh
COMx_InitStructure.UART_P_SW = UART1_SW_P30_P31; //切換端口, UART1_SW_P30_P31,UART1_SW_P36_P37,UART1_SW_P16_P17(必須使用內部時鐘)
COMx_InitStructure.UART_RXD_TXD_Short = DISABLE; //內部短路RXD與TXD, 做中繼, ENABLE,DISABLE
USART_Configuration(USART1, &COMx_InitStructure); //初始化串口1 USART1,USART2
PrintString1("STC15 UART1 Test Prgramme!\r\n"); //SUART1發送一個字符串
/**
*RS 485 使能端口
sbit RS485_DIR = P2^0; //RS485方向選擇引腳
RS485_DIR = 0; //RS485設置為接收方向
*/
}
/*************main.c*********************************/
void main()
{
u8 i = 0;
UART_config();
EA = 1;
while(1)
{
RS485_DE = 1;
RS485_RE = 1;
// PrintString1("\r\n");
PrintString1("Is New Over");
for(i = 0;i < 8;i++)
{
TX1_write2buff(0x40 + i);
delay_ms(1000);
RS485_DE = 0;
RS485_RE = 0;
if(RX1_Buffer[1] == 0xAA)
{
RS485_DE = 1;
RS485_RE = 1;
PrintString1("進入中斷");
delay_ms(500);
// RX1_Buffer[1] = 0;
}
RS485_DE = 1;
RS485_RE = 1;
}
} // <-- end while
} // <-- end main

復制代碼

/******************************************
***
*PROJICT CODE: 串口程序
*CREATE DATE : 2017/10/20
*CREATED BY : CHneg
*FUNCTION : 初始化數據發送數據接收
*MODIFY DATE : /
*DOCUMENT : STC DataSheet
*OTHERS : /
******************************************
***/
#include "main.h"
COMx_Define COM1;
u8 idata TX1_Buffer[COM_TX1_Lenth]; //發送緩沖
u8 idata RX1_Buffer[COM_RX1_Lenth]; //接收緩沖
u8 ExtsAddr = 0x00;
u8 DestAddr = 0x01;
u8 RTUOverFlag=0,RTUStartFlag=0,UART_R_RTU[20],RTUFunc,
RTUPst,RTUDataLen,UARTRTUDataCheckedFlag=0;
u8 USART_Configuration(u8 UARTx, COMx_InitDefine *COMx)
{
u8 i;
u32 j;
if(UARTx == USART1)
{
COM1.id = 1;
COM1.TX_read = 0;
COM1.TX_write = 0;
COM1.B_TX_busy = 0;
COM1.RX_Cnt = 0;
COM1.RX_TimeOut = 0;
COM1.B_RX_OK = 0;
for(i=0; i<COM_TX1_Lenth; i++) TX1_Buffer[i] = 0;
for(i=0; i<COM_RX1_Lenth; i++) RX1_Buffer[i] = 0;
if(COMx->UART_Mode > UART_9bit_BRTx) return 1; //模式錯誤
if(COMx->UART_Polity == PolityHigh) PS = 1; //高優先級中斷
else PS = 0; //低優先級中斷
SCON = (SCON & 0x3f) | COMx->UART_Mode;
if((COMx->UART_Mode == UART_9bit_BRTx) ||(COMx->UART_Mode == UART_8bit_BRTx)) //可變波特率
{
j = (MAIN_Fosc / 4) / COMx->UART_BaudRate; //按1T計算
if(j >= 65536UL) return 2; //錯誤
j = 65536UL - j;
if(COMx->UART_BRT_Use == BRT_Timer1)
{
TR1 = 0;
AUXR &= ~0x01; //S1 BRT Use Timer1;
TMOD &= ~(1<<6); //Timer1 set As Timer
TMOD &= ~0x30; //Timer1_16bitAutoReload;
AUXR |= (1<<6); //Timer1 set as 1T mode
TH1 = (u8)(j>>8);
TL1 = (u8)j;
ET1 = 0; //禁止中斷
TMOD &= ~0x40; //定時
INT_CLKO &= ~0x02; //不輸出時鐘
TR1 = 1;
}
else if(COMx->UART_BRT_Use == BRT_Timer2)
{
AUXR &= ~(1<<4); //Timer stop
AUXR |= 0x01; //S1 BRT Use Timer2;
AUXR &= ~(1<<3); //Timer2 set As Timer
AUXR |= (1<<2); //Timer2 set as 1T mode
TH2 = (u8)(j>>8);
TL2 = (u8)j;
IE2 &= ~(1<<2); //禁止中斷
AUXR &= ~(1<<3); //定時
AUXR |= (1<<4); //Timer run enable
}
else return 2; //錯誤
}
else if(COMx->UART_Mode == UART_ShiftRight)
{
if(COMx->BaudRateDouble == ENABLE) AUXR |= (1<<5); //固定波特率SysClk/2
else AUXR &= ~(1<<5); //固定波特率SysClk/12
}
else if(COMx->UART_Mode == UART_9bit) //固定波特率SysClk*2^SMOD/64
{
if(COMx->BaudRateDouble == ENABLE) PCON |= (1<<7); //固定波特率SysClk/32
else PCON &= ~(1<<7); //固定波特率SysClk/64
}
if(COMx->UART_Interrupt == ENABLE) ES = 1; //允許中斷
else ES = 0; //禁止中斷
if(COMx->UART_RxEnable == ENABLE) REN = 1; //允許接收
else REN = 0; //禁止接收
P_SW1 = (P_SW1 & 0x3f) | (COMx->UART_P_SW & 0xc0); //切換IO
if(COMx->UART_RXD_TXD_Short == ENABLE) PCON2 |= (1<<4); //內部短路RXD與TXD, 做中繼, ENABLE,DISABLE
else PCON2 &= ~(1<<4);
return 0;
}
return 3; //其它錯誤
}
/*************** 裝載串口發送緩沖 *******************************/
void TX1_write2buff(u8 dat) //寫入發送緩沖，指針+1
{
TX1_Buffer[COM1.TX_write] = dat; //裝發送緩沖
if(++COM1.TX_write >= COM_TX1_Lenth) COM1.TX_write = 0;
if(COM1.B_TX_busy == 0) //空閑
{
COM1.B_TX_busy = 1; //標志忙
TI = 1; //觸發發送中斷
}
}
void PrintString1(u8 *puts) // 發送字符串
{
for (; *puts != 0; puts++)
TX1_write2buff(*puts); //遇到停止符0結束
}
void MovCharSBuffer(unsigned char c) // 數據幀定義及中斷函數
{
SBUF=c;
while(TI!=1);
TI=0;
}
/**************發送數據幀函數***********************/
void Send_RTU(unsigned char DestAddr,unsigned char S_RTUFunc,unsigned char S_RTUDataLen,unsigned char *S_RTUData)
{
unsigned char i,S_RTUCheck;
ES=0;
EA=0;
REN=0;
//RTUDataLen=0x00;
delay_ms(1);
S_RTUCheck=0;
MovCharSBuffer(FrameHead); // 0x40 @ /1 幀頭
MovCharSBuffer(DestAddr); // 0x01 /2
S_RTUCheck=S_RTUCheck+DestAddr; // 0+ 0x01
MovCharSBuffer(S_RTUFunc); // 0x11 /3
S_RTUCheck=S_RTUCheck+S_RTUFunc; // 0x01 +0x11
MovCharSBuffer(S_RTUDataLen); // 0x07 /4
S_RTUCheck=S_RTUCheck+S_RTUDataLen; // 0x12 +0x07 = 0x19
if(S_RTUDataLen!=0)
{
for(i=0;i<S_RTUDataLen;i++)
{
MovCharSBuffer(*S_RTUData); // /N* 數據
S_RTUCheck=S_RTUCheck+*S_RTUData;
S_RTUData++;
}
}
MovCharSBuffer(S_RTUCheck); // /7
MovCharSBuffer(0x23); // /8
ES=1;
EA=1;
REN=1;
}
/********************* UART1中斷函數************************/
void UART1_int (void) interrupt UART1_VECTOR
{
if(RI)
{
RI = 0;
if(COM1.B_RX_OK == 0)
{
if(COM1.RX_Cnt >= COM_RX1_Lenth)
COM1.RX_Cnt = 0;
RX1_Buffer[COM1.RX_Cnt++] = SBUF;
COM1.RX_TimeOut = TimeOutSet1;
}
}
if(TI)
{
TI = 0;
if(COM1.TX_read != COM1.TX_write)
{
SBUF = TX1_Buffer[COM1.TX_read];
if(++COM1.TX_read >= COM_TX1_Lenth)
COM1.TX_read = 0;
}
else COM1.B_TX_busy = 0;
}
}

復制代碼

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單片機485通訊的問題 只能接收到第一次的數據

單片機485通訊的問題只能接收到第一次的數據