8051 embedded code 4 serial comm

[akashexe]

can some one give a code to transmit a byte over the rs232 cable thru the port 0 of 8051.

 

[khongai]

for your reference
https://www.pjrc.com/tech/8051/serial_io.html

 

[akashexe]

well i wanted seperate code to transmit and receive data byte from rs 232 cable
the programming languauge that i expected is embedded c

 

[mondunno]

whatz the purpose? when u have on board uart hardware. ok anyway, configure one timer for the required baud rate, now send a bit(LS, stop bit first) and read the val on receiving port. remember to connect max232 level shifter.

 

[zhanhualiu]

Look at this file.

 

[budhy]

If you use Keil C51, what do you need is call this function :

void initUART(void) {
    SCON=0x53;  //serial port as regular UART
    TH1=0xFD;   //9600 baud with 11.059 MHz xtal
    TL1=0xFD;
    TR1=1;      //start baid rate generator
}

after that you can use these function to do serial I/O :

// serial character input function
char getchar(void);            

// serial character output function
void putchar(char c);          

// serial string output function
void puts(const char *string); 

// serial string input function
char *gets (char *string,     /* string to read             */
            int len);         /* maximum characters to read */

Note : read C:\Keil\C51\HLP\C51lib.chm for more information and samples