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question about command line communication via rs232

 
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radiofm



Joined: 12 Jan 2006
Posts: 9
Location: Poland

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question about command line communication via rs232
PostPosted: Sat Nov 18, 2006 3:03 pm     Reply with quote
Hello all

it's my first post
sorry for my poor english

my first project in CCS - C:
Radio FM tuner - i want to control my radio FM tuner via RS232 from command line
i am using TSA5522 PLL chip to control frequency and PIC16F877A

my first test:


Code:

#include <16F877.h>
#use delay(clock=4000000)
#use i2c(Master,sda=PIN_C4,scl=PIN_C3)
#use rs232(baud=19200, xmit=PIN_C6, rcv=PIN_C7, bits=8, parity=N)
#fuses HS,NOWDT,NOPROTECT,NOLVP,DEBUG
long freq,pll;
main ()
{
freq = 935; //manually i set fequency to 93.5 MHz
pll = freq+107; //now i create pll it's becouse we must add to freq 10.7 MHz to p.cz.+ 10.7 MHz
//but it's x 10 becouse i dont like ","
pll= pll/0.05; //now step = 50 KHz
i2c_start();  //start i2c
i2c_write(0xC2); //adress TSA5522 chip
i2c_write(pll/256/10); // DB1
i2c_write(pll/10); // DB2
i2c_write(0x80);  //CB
i2c_write(0x00);  //PB
i2c_stop(); //and radio play at 93.5 MHz
}


and it's working perfectly radio play at 93.5 MHz

ok - now i must wirte communnication with PIC via hyperterminal (rs232)
for example first i want to set via hyperterminal frequency when i am connect to pic
In my program i manualy set 935
Code:

freq = 935;


probably i must use INTERRUPTS and gets() ?


thanks

Robert
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Nov 19, 2006 1:39 pm     Reply with quote
You can define a simple message protocol to send the FM frequency
to the PIC. The message will consist of ASCII characters.

Use one character to indictate the beginning of a message, such as '$'.
Then send three ASCII numbers, which are the FM frequency.
Finally, the end of the message is indicated by a carriage return (0x0D)
or a carriage return and Linefeed (0x0D 0x0A). Example:

"$935" (followed by 0x0D)

Then use the code in the CCS example file, Ex_Sisr.c, to create an
interrupt-driven receive buffer. In a while() loop in main(), call
the bkbhit() function to see if a character is in the buffer. Read
characters and thrown them away, until you get a '$' character.
This indicates the start of a message. Then read the next three
characters. Check if they are ASCII numbers. If not, then the
message is not valid, so go back to waiting for a '$' again.

When you get each ASCII number ('9' '3' '5'), put them into an array,
sequentially. When you have all three numbers, write a 0x00 byte
at the end. This makes it into a string. Now use the atol() function
to convert the numeric ASCII string into a long integer. Put the
result into the 'freq' variable. Then use the frequency in the rest of
your program.

--------------

Or, if you don't want to use interrupts, then a more simple method
would be to use the get_string() function. Get the string, then use
the atol() function to convert it to a long, and put the result in 'freq'.
The get_string() function is safer to use than gets(), because it allows
you to set a limit on the number of characters that can be entered,
so the user doesn't type beyond the end of the input array.
Look in this file for get_string():
c:\program files\picc\drivers\input.c
radiofm



Joined: 12 Jan 2006
Posts: 9
Location: Poland

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PostPosted: Sun Nov 19, 2006 4:08 pm     Reply with quote
hello
thanks for answer probably it will be better for me used a input.c driver but:
when i include input.c driver
Code:

#include <16F877A.h>
#use delay(clock=4000000)
#use i2c(Master,sda=PIN_C4,scl=PIN_C3)
#use rs232(baud=19200, xmit=PIN_C6, rcv=PIN_C7, bits=8, parity=N)
#include <input.c>


i recived error:

Code:

Executing: "C:\Program files\Picc\CCSC.exe" "INPUT.C" +FM +DF +LN +T -A +M +Z +Y=9 +EA
*** Error 128 "C:\Program Files\PICC\Drivers\INPUT.C" Line 13(1,2): A #DEVICE required before this line
      1 Errors,  0 Warnings.
Halting build on first failure as requested.
BUILD FAILED: Sun Nov 19 23:03:43 2006


i am using PCM 3.249 version.


(i am totally newbie in programming)
PCM programmer



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Posts: 21708

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PostPosted: Sun Nov 19, 2006 4:37 pm     Reply with quote
Quote:
A #DEVICE required before this line

http://www.ccsinfo.com/forum/viewtopic.php?t=22611
http://www.ccsinfo.com/forum/viewtopic.php?t=17303&start=1
radiofm



Joined: 12 Jan 2006
Posts: 9
Location: Poland

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PostPosted: Mon Nov 20, 2006 3:11 am     Reply with quote
hello

now i create something like that:
Code:


#include <16F877A.h>
#use delay(clock=4000000)
#use i2c(Master,sda=PIN_C4,scl=PIN_C3)
#use rs232(baud=19200, xmit=PIN_C6, rcv=PIN_C7, bits=8, parity=N, stream=RS232)
#include <input.c>
#include <string.h>
#include <stdlib.h>
#define  STRING_SIZE  20
#define MAX_BUFFER 10
char string[MAX_BUFFER]; 
long pll,freq;

main ()
{
while(1)
{
    printf("\r\nset freq: ");

    // Wait for a key press
    while(!kbhit());
 
    get_string(string, MAX_BUFFER);
   //printf("\r\n%s\r\n",string);


strcpy(string,freq);

freq = atol(string);
pll = freq+107; 
pll= pll/0.05; //step = 50 KHz
i2c_start();  //start i2c
i2c_write(0xC2); //adres
i2c_write(pll/256/10); // DB1
i2c_write(pll/10); // DB2
i2c_write(0x80);  //CB
i2c_write(0x00);  //PB
i2c_stop();
}
}




Code:

BUILD SUCCEEDED: Mon Nov 20 10:20:32 2006



also i can connect with PIC via rs232

for example in hyperterminal:

set freq :

i write:

930 and presss enter

but radio don't play ...
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Nov 20, 2006 3:27 am     Reply with quote
Quote:
{
printf("\r\nset freq: ");

// Wait for a key press
while(!kbhit());

get_string(string, MAX_BUFFER);
//printf("\r\n%s\r\n",string);

strcpy(string,freq);

freq = atol(string);
pll = freq+107;
pll= pll/0.05; //step = 50 KHz
i2c_start(); //start i2c
i2c_write(0xC2); //adres
i2c_write(pll/256/10); // DB1
i2c_write(pll/10); // DB2
i2c_write(0x80); //CB
i2c_write(0x00); //PB
i2c_stop();
}
}

but don't working....

Look at the strcpy() line. It's not necessary. Also, the parameters
are not correct. It wouldn't work, even if it was needed. Delete it.
radiofm



Joined: 12 Jan 2006
Posts: 9
Location: Poland

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PostPosted: Mon Nov 20, 2006 4:22 am     Reply with quote
hello

thanks !!!!!

in this configurtion working !

Code:

#include <16F877A.h>
#use delay(clock=4000000)
#use i2c(Master,sda=PIN_C4,scl=PIN_C3)
#use rs232(baud=19200, xmit=PIN_C6, rcv=PIN_C7, bits=8, parity=N)
#include <input.c>
 
#include <stdlib.h>
#define  STRING_SIZE  20
#define MAX_BUFFER 10
char string[MAX_BUFFER]; 
long pll,freq;

main ()
{
while(1)
{
    printf("\r\nset freq: ");


    while(!kbhit());

    get_string(string, MAX_BUFFER);

freq = atol(string);
pll = freq+107; 
pll= pll/0.05; //step = 50 KHz
i2c_start();  //start i2c
i2c_write(0xC2); //adres
i2c_write(pll/256/10); // DB1
i2c_write(pll/10); // DB2
i2c_write(0x80);  //CB
i2c_write(0x00);  //PB
i2c_stop();
}
}


but it's not all Smile

i want create a few command to communicte with my radio for example:

when i type in hyperterminal :

setfreq930

i want to change freq to 93mhz

maybe command:
setlch10
set left chanel volume to 10 - i want to use a digital potentiometers ... etc..

my question is:

is it possible to add "setfreq" and when i add this programm know that must set frequency..


i am a technican and i work in radio station - i want to bulid remonte control fm tuner i using DIGI CONNECT MODULES rs232 to ethernet controllers

now i create to test other module to remonte temperature and voltage control
a simple programm i (found simple ccs ds1621 example in internet)

this send me information about temperature in (C) and about voltage(in mV - to 5012 mV) (it's measure a pic voltage)


Code:

#include <16F877A.h>
#device adc=10
#fuses HS, NOWDT, NOPROTECT
#use delay(clock=8000000)
#use rs232(baud=19200, xmit=PIN_C1, rcv=PIN_C2, bits=8, parity=N, STREAM=COM_B) //future
#use rs232(baud=19200, xmit=PIN_C6, rcv=PIN_C7, bits=8, parity=N, STREAM=COM_A)
#use i2c(sda=PIN_C4,scl=PIN_C3)

void temp_config(byte data)
{

   i2c_start();
   i2c_write(0x90);
   i2c_write(0xac);
   i2c_write(data);
   i2c_stop();
   delay_ms(11);
}


void init_program()
{
   i2c_start(0);
   i2c_write(0x90);
   i2c_write(0xee);
   i2c_stop();
   temp_config(8);

   setup_adc(ADC_CLOCK_INTERNAL);
   setup_adc_ports(ALL_ANALOG);
   set_adc_channel(0);
}


byte read_temp()
 {       
   byte datah,datal;
   long data;

   i2c_start();
   i2c_write(0x90);
   i2c_write(0xaa);
   i2c_start();
   i2c_write(0x91);
   datah=i2c_read();
   datal=i2c_read(0);
   i2c_stop();
   data=datah;
   datal=data;
   return(datal);

 
}

main()

{
   byte value;
   int value2;

    init_program();
 do
{
   value = read_temp();
   // value2 = ((Read_ADC())*49)/10;


   fprintf(COM_A,"\n\r\@TEMP1=%u",value);
   delay_ms(1000);
    fprintf(COM_A,"\n\r\@V1=%Lu",((Read_ADC())*49)/10);
   delay_ms(1000);
   
   }
   while (TRUE);
   }


i want to set fm tuner near FM transmitter and remonte test some parametrs and also i want to control this tuner set to other freq using DIGI CONNECT MODULES

exaple with temperature and voltage working perfectly - i can monitor tempertaure where my fm transmiiter is installed..


sorry for my bad english ;)
regards

Robert.

p.s. when i finish a hardware i i want to publish this for other people (schematics etc.)
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Nov 20, 2006 4:46 am     Reply with quote
You need to design a simple command protocol, in which each command
is a single ASCII letter. Then the numbers associated with the command
will come after the letter.
Code:

Example of commands:
F:  set frequency
L:  set left channel volume
R:  set right channel volume.

Example of use:
F935
L10
R15


After you get the command string (for example, "L10"), use the first
character in the buffer as the parameter for a switch-case statement.
Each command will be a different 'case' in the switch-case statement.

Code:
int16 command_value;

// Get the number which comes after the command letter.
command_value = atol(&buffer[1]);

// Take action based upon the command letter.
switch(buffer[0])
  {
    case 'F':
       // Put code to here to set the frequency.
       break;

    case 'L':
       // Put code here to set left volume.
       break;


     default:
  }

This is a very simple example. It's enough to get you started.
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