Soft Uart transmission in pic18f452

[sobia sarwar]

i wanted to send some data as text through soft uart to pc because i have already used my tx and rx pins.

 

[Magvitron]

you have a very vague question. we all need to know the compiler and other stuffs about your project. if you are using the mikroC compiler, there is a software UART library already included in it. refer its documentation.

 

[sobia sarwar]

i m using Mikroc pro V4 as compiler and proteus V7 as simulation software. i tried the example of soft uart from mikroc pro library but it dosen't work

 

[kripacharya]

i tried the example of soft uart from mikroc pro library but it dosen't work

are you saying that the MiKroC Pro library software & the example are bad pieces of software code ?

If not, then you need to give some details of what actually happens, how you put it together, what code you wrote, what settings etc etc.

 

[sobia sarwar]

this is not what i actually wanted to say. here is he code I tried

char i, error, byte_read;                 // Auxiliary variables

void main(){

  ANSEL  = 0;                             // Configure AN pins as digital I/O
  ANSELH = 0;
  
  TRISB = 0x00;                           // Set PORTB as output (error signalization)
  PORTB = 0;                              // No error

  error = Soft_UART_Init(&PORTC, 7, 6, 14400, 0); // Initialize Soft UART at 14400 bps
  if (error > 0) {
    PORTB = error;                        // Signalize Init error
    while(1) ;                            // Stop program
  }
  Delay_ms(100);

  for (i = 'z'; i >= 'A'; i--) {          // Send bytes from 'z' downto 'A'
    Soft_UART_Write(i);
    Delay_ms(100);
  }
   
  while(1) {                              // Endless loop
    byte_read = Soft_UART_Read(&error);   // Read byte, then test error flag
    if (error)                            // If error was detected
      PORTB = error;                      //   signal it on PORTB
    else
      Soft_UART_Write(byte_read);         // If error was not detected, return byte read
    }      
}

i wanted to know that in

Soft_UART_Init(&PORTC, 7, 6, 14400, 0);

what does &PORTC stands for means which port i have to give there.

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actually i m using PIC18F452 AND I HAVE ALREADY USED TX AND RX PIN OF pic18f452 for serial communication now i just wanted to send some text like

your vote casted

to pc through serial comm and what i read about i have to use soft uart but i m not getting how to use soft uart

 

[jayanth.devarayanadurga]

&PORTC means you are using PORTC for SoftUART in that 7 and 6 pins are used for SoftUART Communication. 14400 is the baudrate. Please check the SoftUART Library. Post your mikroC Project files in a zip file.

 

[kripacharya]

That line is the port on whose pins you have Rx and Tx connected. Then next 2 parameters are the pin numbers for Rx and Tx respectively

Also i believe your interrupts should be disabled.

So what actually does happen then ? At first sight your code looks OK. What have you connected this to ?
Make sure all your parameters match - Start bit/ Stop bit, Parity, inverted/ non-inverted, and of course baudrate

 

[sobia sarwar]

zip file including mikroc pro file and proteus simulation

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i changed the code a little more

char error, byte_read;
int i;
char text[15]="vote casted";  
void Soft_UART_Write_Text(char *text) {
     unsigned int x = 0;
     for(x = 0; x <= strlen(text); x++) {
         Soft_UART_Write(text[x]);
     }
 }               // Auxiliary variables
void main(){

  //ANSEL  = 0;                             // Configure AN pins as digital I/O
  //ANSELH = 0;

  TRISB = 0x00;                           // Set PORTB as output (error signalization)
  PORTB = 0;                              // No error

  error = Soft_UART_Init(&PORTC, 17, 16, 9600, 0); // Initialize Soft UART at 14400 bps
  if (error > 0) {
    PORTB = error;                        // Signalize Init error
    while(1) ;                            // Stop program
  }
  Delay_ms(100);

    Soft_UART_Write_Text(text);
}

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can you please send me simple code for sending a string through soft uart to pc

 

[jayanth.devarayanadurga]

See the attached file it is working.

 

[sobia sarwar]

i implemented some soft uart code in my code and it is transmitting a single character on terminal. i m facing problem in sending a string on terminal
code with simulation attached

 

[jayanth.devarayanadurga]

You have posted the project for control-control but not for ballot. The Proteus Simulation has 2 mcu, So, I need the mikroC Project files for ballot mcu. I have to get the ballot.hex for the other mcu. Without that I can't simulate your project.

 

[kripacharya]

zip file including mikroc pro file and proteus simulation

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i changed the code a little more

char error, byte_read;
int i;
char text[15]="vote casted";  
void Soft_UART_Write_Text(char *text) {
     unsigned int x = 0;
     for(x = 0; x <= strlen(text); x++) {
         Soft_UART_Write(text[x]);
     }
 }               // Auxiliary variables
void main(){

  //ANSEL  = 0;                             // Configure AN pins as digital I/O
  //ANSELH = 0;

  TRISB = 0x00;                           // Set PORTB as output (error signalization)
  PORTB = 0;                              // No error

  error = Soft_UART_Init(&PORTC, [COLOR="#FF0000"]17, 16,[/COLOR] 9600, 0); // Initialize Soft UART at 14400 bps
  if (error > 0) {
    PORTB = error;                        // Signalize Init error
    while(1) ;                            // Stop program
  }
  Delay_ms(100);

    Soft_UART_Write_Text(text);
}

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can you please send me simple code for sending a string through soft uart to pc

seriously ? your pin numbers on PORTC are Tx= 16 and Rx= 17 ?!? You have to pay more attention to such details Sobia, or you will never be a good embedded programmer.


So the question is... did it work ? Even that single character... how did it get through? Was it the correct character ?? wow.

 

[sobia sarwar]

the file of ballot

 

[jayanth.devarayanadurga]

I am not able to compile the code for control-control.c The compiler says not enough RAM. You have to change your PIC.

 

[sobia sarwar]

this seems wierd becuase i m compiling that code and it is not giving any ram issue.

 

[jayanth.devarayanadurga]

What is the problem you are facing in the control-control.c code? What is not working?

 

[sobia sarwar]

soft uart is working properly on proteus means simulation is happening but when i implemented the same circuit on hardware it is giving me garbage values

 

[jayanth.devarayanadurga]

Post your rs232 (max232) circuit. The one in the real hardware.

 

[zia]

hi i am also feeling problem in mikroc pro but it is working for me mikroc