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標(biāo)題: 關(guān)于89C52單片機(jī)串行通信的數(shù)據(jù)定時發(fā)送要怎么實(shí)現(xiàn)呢？ [打印本頁]

作者: 文子路 時間: 2018-3-23 21:02
標(biāo)題: 關(guān)于89C52單片機(jī)串行通信的數(shù)據(jù)定時發(fā)送要怎么實(shí)現(xiàn)呢？
我是進(jìn)行了一點(diǎn)基礎(chǔ)學(xué)習(xí)的單片機(jī)的小白一枚，但是現(xiàn)在有項目急需使用到單片機(jī)的串行通信。想請教各位數(shù)據(jù)定時發(fā)送要怎樣在單片機(jī)中實(shí)現(xiàn)呢？
是使用串口通信中斷實(shí)現(xiàn)還是直接用定時器中斷就能實(shí)現(xiàn)呢？定時的要求比較高，每10ms能從串口發(fā)送一次數(shù)據(jù)出去。各位大佬支支招！

作者: zhangxiaozi 時間: 2018-3-23 22:41
每10MS發(fā)一次數(shù)據(jù)，當(dāng)然用定時器中斷了

作者: oohoh 時間: 2018-3-23 23:10
既然定時要求高當(dāng)然要用定時器，在中斷代碼中發(fā)串口數(shù)據(jù)

#include "reg51.h"
#include "intrins.h"

sfr T2CON  = 0xC8;       //timer2 control register
sfr RCAP2L = 0xCA;
sfr RCAP2H = 0xCB;
sfr TL2 = 0xCC;
sfr TH2 = 0xCD;

typedef unsigned char BYTE;
typedef unsigned int WORD;

#define FOSC 18432000L    //System frequency
#define BAUD 115200    //UART baudrate

/*Define UART parity mode*/
#define NONE_PARITY    0 //None parity
#define ODD_PARITY    1 //Odd parity
#define EVEN_PARITY    2 //Even parity
#define MARK_PARITY    3 //Mark parity
#define SPACE_PARITY 4 //Space parity

#define PARITYBIT EVEN_PARITY //Testing even parity

sbit bit9 = P2^2;          //P2.2 show UART data bit9
bit busy;

void SendData(BYTE dat);
void SendString(char *s);

void main()
{
#if (PARITYBIT == NONE_PARITY)
SCON = 0x50;          //8-bit variable UART
#elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
SCON = 0xda;          //9-bit variable UART, parity bit initial to 1
#elif (PARITYBIT == SPACE_PARITY)
SCON = 0xd2;          //9-bit variable UART, parity bit initial to 0
#endif

TL2 = RCAP2L = (65536-(FOSC/32/BAUD)); //Set auto-reload vaule
TH2 = RCAP2H = (65536-(FOSC/32/BAUD)) >> 8;
T2CON = 0x34;          //Timer2 start run
ES = 1;                //Enable UART interrupt
EA = 1;                //Open master interrupt switch

SendString("STC89-90xx\r\nUart Test !\r\n");
while(1);
}

/*----------------------------
UART interrupt service routine
----------------------------*/
void Uart_Isr() interrupt 4 using 1
{
if (RI)
{
      RI = 0;          //Clear receive interrupt flag
      P0 = SBUF;       //P0 show UART data
      bit9 = RB8;       //P2.2 show parity bit
}
if (TI)
{
      TI = 0;          //Clear transmit interrupt flag
      busy = 0;          //Clear transmit busy flag
}
}

/*----------------------------
Send a byte data to UART
Input: dat (data to be sent)
Output:None
----------------------------*/
void SendData(BYTE dat)
{
while (busy);          //Wait for the completion of the previous data is sent
ACC = dat;             //Calculate the even parity bit P (PSW.0)
if (P)                //Set the parity bit according to P
{
#if (PARITYBIT == ODD_PARITY)
      TB8 = 0;          //Set parity bit to 0
#elif (PARITYBIT == EVEN_PARITY)
      TB8 = 1;          //Set parity bit to 1
#endif
}
else
{
#if (PARITYBIT == ODD_PARITY)
      TB8 = 1;          //Set parity bit to 1
#elif (PARITYBIT == EVEN_PARITY)
      TB8 = 0;          //Set parity bit to 0
#endif
}
busy = 1;
SBUF = ACC;          //Send data to UART buffer
}

/*----------------------------
Send a string to UART
Input: s (address of string)
Output:None
----------------------------*/
void SendString(char *s)
{
while (*s)             //Check the end of the string
{
      SendData(*s++);    //Send current char and increment string ptr
}
}

作者: 文子路 時間: 2018-3-25 15:05

zhangxiaozi 發(fā)表于 2018-3-23 22:41
每10MS發(fā)一次數(shù)據(jù)，當(dāng)然用定時器中斷了

那數(shù)據(jù)發(fā)送要怎么實(shí)現(xiàn)呢？

歡迎光臨 (http://www.raoushi.com/bbs/)