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serial comminication
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MCUprogrammer



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serial comminication
PostPosted: Fri Oct 06, 2023 5:01 am     Reply with quote

Hello
I am sending 5 bytes of data from PIC to PC. There is no problem. But I am sending 66bytes of data from my PC. I want to print that incoming data to the screen. It didn't work I send 66byte hex code from PC, for example ff 0d
Code:

#include <18F47Q83.h>
#use delay(crystal = 16MHz)

#pin_select U1TX=PIN_C6
#pin_select U1RX=PIN_C7
#use rs232(UART1, baud=9600, receive_buffer=256, parity=N, stop=1)

#define LCD_ENABLE_PIN  PIN_D2
#define LCD_RS_PIN      PIN_D0
#define LCD_RW_PIN      PIN_D1

#define LCD_DATA4       PIN_D4
#define LCD_DATA5       PIN_D5
#define LCD_DATA6       PIN_D6
#define LCD_DATA7       PIN_D7

#include <lcd.c>

#define SEND_DATA_SIZE 5
#define RECEIVE_DATA_SIZE 66

void SendTask(void)
{
   unsigned int8 i;
   char sendDataHEX[SEND_DATA_SIZE] = {0x1B, 0xE7, 0x01, 0x03, 0x0D};
   
   for(i=0;i<SEND_DATA_SIZE;i++)
   {
      putc(sendDataHEX[i]);
   }
}

void main()
{
  lcd_init();

    int1 doSend = TRUE;
   char receivedData[RECEIVE_DATA_SIZE];
   
   while(TRUE)
   {

      if(doSend)
      {
          SendTask();
         
          doSend = FALSE;
      }
     
     
      // PC'den gelen veriyi al
      for (int8 i = 0; i < RECEIVE_DATA_SIZE; i++)
      {
         output_high(PIN_C5);
         receivedData[i] = getc();
         lcd_gotoxy(i,1);printf("%02X ", receivedData[i]);
         output_low(PIN_C5);
         
      }
      doSend = TRUE;
     
   }
}

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MCUprogrammer
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Ttelmah



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Posts: 19145

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PostPosted: Fri Oct 06, 2023 5:23 am     Reply with quote

One key thing. You need enable_interrupts(GLOBAL); at the start of your
main, or the receive buffer will not be working.
Can your LCD show this much?. You are printing 3 characters for each one
received, so the display would need 198 columns!....
MCUprogrammer



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PostPosted: Fri Oct 06, 2023 5:34 am     Reply with quote

Yes I know. I fixed it. I press the PC screen. Or when I press the LCD, the character is printed in type T. 4x20 character LCD works fine. Now I corrected what you said. So why doesn't it run the SendTask() function after the er transaction? after for loop doSend = TRUE; I'm doing it.
Code:

#include <18F47Q83.h>
#use delay(crystal = 16MHz)

#pin_select U1TX=PIN_C6
#pin_select U1RX=PIN_C7
#use rs232(UART1, baud=9600, receive_buffer=256, parity=N, stop=1)

#define LCD_ENABLE_PIN  PIN_D2
#define LCD_RS_PIN      PIN_D0
#define LCD_RW_PIN      PIN_D1

#define LCD_DATA4       PIN_D4
#define LCD_DATA5       PIN_D5
#define LCD_DATA6       PIN_D6
#define LCD_DATA7       PIN_D7

#include <lcd.c>

#define SEND_DATA_SIZE 5
#define RECEIVE_DATA_SIZE 66

void SendTask(void)
{
   unsigned int8 i;
   char sendDataHEX[SEND_DATA_SIZE] = {0x1B, 0xE7, 0x01, 0x03, 0x0D};
   
   for(i=0;i<SEND_DATA_SIZE;i++)
   {
      putc(sendDataHEX[i]);
   }
}

void main()
{
  lcd_init();

    int1 doSend = TRUE;
   char receivedData[RECEIVE_DATA_SIZE];
   enable_interrupts(GLOBAL);
   
   while(TRUE)
   {

      if(doSend)
      {
          SendTask();
         
          doSend = FALSE;
      }
     
     
      // PC'den gelen veriyi al
      for (int8 i = 0; i < RECEIVE_DATA_SIZE; i++)
      {
         output_high(PIN_C5);
         receivedData[i] = getc();
         printf("%02X ", receivedData[i]);
         output_low(PIN_C5);
         
      }
     
      doSend = TRUE;
     
   }
}

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MCUprogrammer



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PostPosted: Fri Oct 06, 2023 5:40 am     Reply with quote

And I also want to check if the RX is no longer receiving data, that is, if the data reception bus is empty. Is there such a flag? He did the retrieval. finished. I'll check it later.,
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Ttelmah



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PostPosted: Fri Oct 06, 2023 6:13 am     Reply with quote

kbhit tells you if there are any characters waiting to be read.
rcv_buffer_bytes() returns how many characters are in the receive buffer
at any time. Look in the manual for both.
dyeatman



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PostPosted: Fri Oct 06, 2023 7:07 am     Reply with quote

#use rs232 is also missing ERRORS
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MCUprogrammer



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PostPosted: Fri Oct 06, 2023 8:06 am     Reply with quote

well I use gets and puts to receive and send strings. But I couldn't get it to work.
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MCUprogrammer



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PostPosted: Fri Oct 06, 2023 9:40 am     Reply with quote

So, can I use 2 rs232() streams in the PIC? For example.
#pin_select U1TX=PIN_C6
#pin_select U1RX=PIN_C7
#use rs232(UART1, baud=9600, receive_buffer=256, parity=N, stop=1,bits=8,ERRORS)
I will use it. This way I will press the screen on the PIC. I will push the other one to siow.exe for control purposes. If I make it #use rs232(ICD, baud=9600), will it work?
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Ttelmah



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PostPosted: Fri Oct 06, 2023 1:35 pm     Reply with quote

Yes, BUT.

You chip has multiple hardware UART's, so 'yes'.

BUT. There are hardware restrictions on which pins can be used.
You need to read the data sheet. In particular Table 21-1, and the rest
of that section about the PPS. This shows which pins each port can
be allocated to.
You show just one #use RS232. You need to setup a second, and use
stream names for each. Then use getc and putc _with these names_.
MCUprogrammer



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PostPosted: Fri Oct 06, 2023 11:32 pm     Reply with quote

I will take into account what you said and try it.

I am very sorry. I examined the lcd.c library. But when I added this code #define LCD_DATA_PORT getenv("SFR:PORTD") I connected it to D4-D4,D5-D5,D6-D6,D7-D7. But I didn't understand where to connect the RS, RW, and E pins. Where is it written. By the way, if I write as follows, the LCD works and there is no problem. But it seems better to write one line instead of defining them one by one.
Code:

#define LCD_ENABLE_PIN  PIN_D2
#define LCD_RS_PIN      PIN_D0
#define LCD_RW_PIN      PIN_D1

#define LCD_DATA4       PIN_D4
#define LCD_DATA5       PIN_D5
#define LCD_DATA6       PIN_D6
#define LCD_DATA7       PIN_D7

#include <lcd.c>

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Ttelmah



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PostPosted: Sat Oct 07, 2023 4:17 am     Reply with quote

I suggest you foget the lcd.c library!....
Instead goto the code library here and get PCM_programmers flex_lcd
driver. This is vastly more flexible, and works really well. Much more
capable than the CCS supplied driver.
MCUprogrammer



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PostPosted: Wed Oct 11, 2023 6:30 am     Reply with quote

Could there be a situation where the RX terminal times out? Data is coming to the PC. But when I try to read it with the processor, I cannot receive the data. RX seems like it can't receive data. It's like it's locked.
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temtronic



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PostPosted: Wed Oct 11, 2023 6:39 am     Reply with quote

You really need to post your current code as there can be several reasons why it may not work.

I always code/compile/test a simple 'PC ECHO' program when needing 'serial communications. I use the CCS supplied ex_sisr.c code and type in a PC terminal program, which sends bytes to PIC, the PIC then returns them to the PC screen. This is a simple test to confirm the hardware is correct as well as basic PIC C code functions as it should.
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PostPosted: Wed Oct 11, 2023 6:44 am     Reply with quote

I am using the 3.3v ethernet kit. There is a stereo jack on the rs232 part. When sending data, for example, I send characters with putc. Shouldn't I see a signal at the TX end? Also, I should see a signal at the RC end when receiving data. Is it true?
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temtronic



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PostPosted: Wed Oct 11, 2023 7:38 am     Reply with quote

no......
'RS-232' historically had +-12 volt signals ,over the years it's been 'modified' several times and today's PC don't have 'RS-232' comm ports

I suspect your PC has some form of USB serial interface ?? Some 'module' ?? Post that...it could be USB<> TTL or USB<>RS232 they are not the same....

That 'mini phone jack' isn't 'RS-232' by definition either........
then there's the '3.3v ethernet kit'... sigh... ethernet isn't 'RS-232' so now you're really confusing an old guy like me !!
You should post that product info as well,or a link to it....
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