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radiofm
Joined: 12 Jan 2006
Posts: 9
Location: Poland
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| question about command line communication via rs232 |
 Posted: Sat Nov 18, 2006 3:03 pm |
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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
}
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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
probably i must use INTERRUPTS and gets() ?
thanks
Robert |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Nov 19, 2006 1:39 pm |
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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 |
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radiofm
Joined: 12 Jan 2006
Posts: 9
Location: Poland
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| Posted: Sun Nov 19, 2006 4:08 pm |
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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>
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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
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i am using PCM 3.249 version.
(i am totally newbie in programming) |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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radiofm
Joined: 12 Jan 2006
Posts: 9
Location: Poland
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| Posted: Mon Nov 20, 2006 3:11 am |
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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
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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 ... |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Nov 20, 2006 3:27 am |
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| 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. |
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radiofm
Joined: 12 Jan 2006
Posts: 9
Location: Poland
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| Posted: Mon Nov 20, 2006 4:22 am |
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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();
}
}
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but it's not all 
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);
}
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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.) |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Nov 20, 2006 4:46 am |
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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
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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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