Decode serial messages

[mmanisse]

Hi,
I'm searching a suggest to implement a decode serial ascii message on my firmware.
I have a modem connect on pic 16f877 uart and i have to decode the answer messages.
Example:
I sent a command to the modem with a printf string 'AT' and i must decode the answer 'OK'.
This message always end with 'return ascii char'

How can i do?
Thank you
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516420

[Mark]

Read the data into a buffer until you recieve the 'return char'. Then process the buffer using a string compare function:

char string1[]="OK";

if (stricmp(buffer, string1) == 0)
{
//The strings are equal so do whatever
}

or

char string1[3]; // This must be big enough including the NULL terminator

strcpy(string1, "OK");
if (stricmp(buffer, string1) == 0)
{
//The strings are equal so do whatever
}

:=Hi,
:=I'm searching a suggest to implement a decode serial ascii message on my firmware.
:=I have a modem connect on pic 16f877 uart and i have to decode the answer messages.
:=Example:
:=I sent a command to the modem with a printf string 'AT' and i must decode the answer 'OK'.
:=This message always end with 'return ascii char'
:=
:=How can i do?
:=Thank you
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516427

[Steve H.]

I have similar code posted on my website at the link below.

Steve H.
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516432

[jpt@tayloredge.com]

<a href="http://www.tayloredge.com/utilities/scmd.c.txt" TARGET="_blank">http://www.tayloredge.com/utilities/scmd.c.txt</a>

from

<a href="http://www.tayloredge.com/utilities/index.html" TARGET="_blank">http://www.tayloredge.com/utilities/index.html</a>

This is my command processor, all interrupt level message decode.
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516450

[mmanisse]

ok Mark
i untherstood what do you mean, but i have a little difficoult to do this.
My strategy to decode message is this:
my modem message always is:
'CR' 'LF' 'MESSAGE' 'CR' 'LF'.
With this information i'm working in this mode:
I'm looking for the CR and LF than i buffered the chars to next CR.
Now i have a buffer, how can i compare it?

Tnx

I'm attach the function:

=============================================================
gsm_rx_string()
//Rx string from gsm: 'CR' 'LF' 'XXXXXXXXXX' 'CR' 'LF'
{
MESSAGE_READ=0;
buffer_gsm=0;

buffer_gsm[0] = getc();
if (buffer_gsm[0] != 'CR') // Find Carriage Return.
goto exit;

buffer_gsm[0] = getc();
if (buffer_gsm[0] != 'LF') // Find Line Feed.
goto exit;


i=0; // Buffered the string to next CR
do {
buffer_gsm[i] = getc();
++i;
} while ((buffer_gsm[i-1] != 'CR') || (i<35));


if ((buffer_gsm[i-1] == 'CR') && (i>0))
{
MESSAGE_READ=1;
i=i-1; // Delete CR from string.
}

exit:

}

=============================================================





:=Read the data into a buffer until you recieve the 'return char'. Then process the buffer using a string compare function:
:=
:=char string1[]="OK";
:=
:=if (stricmp(buffer, string1) == 0)
:={
:= //The strings are equal so do whatever
:=}
:=
:=or
:=
:=char string1[3]; // This must be big enough including the NULL terminator
:=
:=strcpy(string1, "OK");
:=if (stricmp(buffer, string1) == 0)
:={
:= //The strings are equal so do whatever
:=}
:=
:=:=Hi,
:=:=I'm searching a suggest to implement a decode serial ascii message on my firmware.
:=:=I have a modem connect on pic 16f877 uart and i have to decode the answer messages.
:=:=Example:
:=:=I sent a command to the modem with a printf string 'AT' and i must decode the answer 'OK'.
:=:=This message always end with 'return ascii char'
:=:=
:=:=How can i do?
:=:=Thank you
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516588

[Mark]

Try this out:

enum message
{
MSG_OK,
MSG_TEST,
MSG_3,
MSG_4,
MSG_5,
MSG_6,
INVALID_MSG
}
gsm_rx_string()

//Rx string from gsm: 'CR' 'LF' 'XXXXXXXXXX' 'CR' 'LF'
{
MESSAGE_READ=0;
buffer_gsm[0]=0;

buffer_gsm[0] = getc();
if (buffer_gsm[0] != '\r') // Find Carriage Return.
return;

buffer_gsm[0] = getc();
if (buffer_gsm[0] != '\n') // Find Line Feed.
return;
i=0;
while(i<35)
{
buffer_gsm[i] = getc();
if (buffer_gsm[i] == '\r')
{
// terminate our string
buffer_gsm[i] = 0
MESSAGE_READ=1;
break;
}
i++;
}
return;
}

enum message Check_GSM_String(char *s1)
{
enum message msg;
char s2[10]; // This must be big enough including the NULL terminator

for (msg=0;msg {
switch (msg)
{
case MSG_OK:
strcpy(s2, "OK");
break;
case MSG_TEST:
strcpy(s2, "TEST");
break;
case MSG_MSG3:
strcpy(s2, "MSG3");
break;
case MSG_MSG4:
strcpy(s2, "MSG4");
break;
case MSG_MSG5:
strcpy(s2, "MSG5");
break;
case MSG_MSG6:
strcpy(s2, "MSG6");
break;
default:
// we shouldn't ever get here! But if we do return invalid message
return(INVALID_MSG);
}
if (stricmp(s1, s2) == 0)
{
//The strings are equal so return which one
return(msg);
}
}
// We didn't find a valid message so return an invalid one
return(INVALID_MSG);
}

:=ok Mark
:=i untherstood what do you mean, but i have a little difficoult to do this.
:=My strategy to decode message is this:
:=my modem message always is:
:='CR' 'LF' 'MESSAGE' 'CR' 'LF'.
:=With this information i'm working in this mode:
:=I'm looking for the CR and LF than i buffered the chars to next CR.
:=Now i have a buffer, how can i compare it?
:=
:=Tnx
:=
:=I'm attach the function:
:=
:==============================================================
:=gsm_rx_string()
:=//Rx string from gsm: 'CR' 'LF' 'XXXXXXXXXX' 'CR' 'LF'
:={
:= MESSAGE_READ=0;
:= buffer_gsm=0;
:=
:= buffer_gsm[0] = getc();
:= if (buffer_gsm[0] != 'CR') // Find Carriage Return.
:= goto exit;
:=
:= buffer_gsm[0] = getc();
:= if (buffer_gsm[0] != 'LF') // Find Line Feed.
:= goto exit;
:=
:=
:= i=0; // Buffered the string to next CR
:= do {
:= buffer_gsm[i] = getc();
:= ++i;
:= } while ((buffer_gsm[i-1] != 'CR') || (i<35));
:=
:=
:= if ((buffer_gsm[i-1] == 'CR') && (i>0))
:= {
:= MESSAGE_READ=1;
:= i=i-1; // Delete CR from string.
:= }
:=
:=exit:
:=
:=}
:=
:==============================================================
:=
:=
:=
:=
:=
:=:=Read the data into a buffer until you recieve the 'return char'. Then process the buffer using a string compare function:
:=:=
:=:=char string1[]="OK";
:=:=
:=:=if (stricmp(buffer, string1) == 0)
:=:={
:=:= //The strings are equal so do whatever
:=:=}
:=:=
:=:=or
:=:=
:=:=char string1[3]; // This must be big enough including the NULL terminator
:=:=
:=:=strcpy(string1, "OK");
:=:=if (stricmp(buffer, string1) == 0)
:=:={
:=:= //The strings are equal so do whatever
:=:=}
:=:=
:=:=:=Hi,
:=:=:=I'm searching a suggest to implement a decode serial ascii message on my firmware.
:=:=:=I have a modem connect on pic 16f877 uart and i have to decode the answer messages.
:=:=:=Example:
:=:=:=I sent a command to the modem with a printf string 'AT' and i must decode the answer 'OK'.
:=:=:=This message always end with 'return ascii char'
:=:=:=
:=:=:=How can i do?
:=:=:=Thank you
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516592

[mmanisse]

Ok Mark,
I have introducted you suggest in my firmware, but the compiler tell me that there is an error on :
'enum message msg;'
It espect a {
This is the first time that i use enum, do you think that there is an error?

I have counted the {} but all opened are closed.
Can you help me?

:=Try this out:
:=
:=enum message
:={
:= MSG_OK,
:= MSG_TEST,
:= MSG_3,
:= MSG_4,
:= MSG_5,
:= MSG_6,
:= INVALID_MSG
:=}
:=gsm_rx_string()
:=
:=//Rx string from gsm: 'CR' 'LF' 'XXXXXXXXXX' 'CR' 'LF'
:={
:= MESSAGE_READ=0;
:= buffer_gsm[0]=0;
:=
:= buffer_gsm[0] = getc();
:= if (buffer_gsm[0] != '\r') // Find Carriage Return.
:= return;
:=
:= buffer_gsm[0] = getc();
:= if (buffer_gsm[0] != '\n') // Find Line Feed.
:= return;
:= i=0;
:= while(i<35)
:= {
:= buffer_gsm[i] = getc();
:= if (buffer_gsm[i] == '\r')
:= {
:= // terminate our string
:= buffer_gsm[i] = 0
:= MESSAGE_READ=1;
:= break;
:= }
:= i++;
:= }
:= return;
:=}
:=
:=enum message Check_GSM_String(char *s1)
:={
:= enum message msg;
:= char s2[10]; // This must be big enough including the NULL terminator
:=
:= for (msg=0;msg := {
:= switch (msg)
:= {
:= case MSG_OK:
:= strcpy(s2, "OK");
:= break;
:= case MSG_TEST:
:= strcpy(s2, "TEST");
:= break;
:= case MSG_MSG3:
:= strcpy(s2, "MSG3");
:= break;
:= case MSG_MSG4:
:= strcpy(s2, "MSG4");
:= break;
:= case MSG_MSG5:
:= strcpy(s2, "MSG5");
:= break;
:= case MSG_MSG6:
:= strcpy(s2, "MSG6");
:= break;
:= default:
:= // we shouldn't ever get here! But if we do return invalid message
:= return(INVALID_MSG);
:= }
:= if (stricmp(s1, s2) == 0)
:= {
:= //The strings are equal so return which one
:= return(msg);
:= }
:= }
:= // We didn't find a valid message so return an invalid one
:= return(INVALID_MSG);
:=}
:=
:=:=ok Mark
:=:=i untherstood what do you mean, but i have a little difficoult to do this.
:=:=My strategy to decode message is this:
:=:=my modem message always is:
:=:='CR' 'LF' 'MESSAGE' 'CR' 'LF'.
:=:=With this information i'm working in this mode:
:=:=I'm looking for the CR and LF than i buffered the chars to next CR.
:=:=Now i have a buffer, how can i compare it?
:=:=
:=:=Tnx
:=:=
:=:=I'm attach the function:
:=:=
:=:==============================================================
:=:=gsm_rx_string()
:=:=//Rx string from gsm: 'CR' 'LF' 'XXXXXXXXXX' 'CR' 'LF'
:=:={
:=:= MESSAGE_READ=0;
:=:= buffer_gsm=0;
:=:=
:=:= buffer_gsm[0] = getc();
:=:= if (buffer_gsm[0] != 'CR') // Find Carriage Return.
:=:= goto exit;
:=:=
:=:= buffer_gsm[0] = getc();
:=:= if (buffer_gsm[0] != 'LF') // Find Line Feed.
:=:= goto exit;
:=:=
:=:=
:=:= i=0; // Buffered the string to next CR
:=:= do {
:=:= buffer_gsm[i] = getc();
:=:= ++i;
:=:= } while ((buffer_gsm[i-1] != 'CR') || (i<35));
:=:=
:=:=
:=:= if ((buffer_gsm[i-1] == 'CR') && (i>0))
:=:= {
:=:= MESSAGE_READ=1;
:=:= i=i-1; // Delete CR from string.
:=:= }
:=:=
:=:=exit:
:=:=
:=:=}
:=:=
:=:==============================================================
:=:=
:=:=
:=:=
:=:=
:=:=
:=:=:=Read the data into a buffer until you recieve the 'return char'. Then process the buffer using a string compare function:
:=:=:=
:=:=:=char string1[]="OK";
:=:=:=
:=:=:=if (stricmp(buffer, string1) == 0)
:=:=:={
:=:=:= //The strings are equal so do whatever
:=:=:=}
:=:=:=
:=:=:=or
:=:=:=
:=:=:=char string1[3]; // This must be big enough including the NULL terminator
:=:=:=
:=:=:=strcpy(string1, "OK");
:=:=:=if (stricmp(buffer, string1) == 0)
:=:=:={
:=:=:= //The strings are equal so do whatever
:=:=:=}
:=:=:=
:=:=:=:=Hi,
:=:=:=:=I'm searching a suggest to implement a decode serial ascii message on my firmware.
:=:=:=:=I have a modem connect on pic 16f877 uart and i have to decode the answer messages.
:=:=:=:=Example:
:=:=:=:=I sent a command to the modem with a printf string 'AT' and i must decode the answer 'OK'.
:=:=:=:=This message always end with 'return ascii char'
:=:=:=:=
:=:=:=:=How can i do?
:=:=:=:=Thank you
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516620

[Mark]

Typo, you need a ; after the }
enum message
{
MSG_OK,
MSG_TEST,
MSG_3,
MSG_4,
MSG_5,
MSG_6,
INVALID_MSG
};

:=Ok Mark,
:=I have introducted you suggest in my firmware, but the compiler tell me that there is an error on :
:='enum message msg;'
:=It espect a {
:=This is the first time that i use enum, do you think that there is an error?
:=
:=I have counted the {} but all opened are closed.
:=Can you help me?
:=
:=:=Try this out:
:=:=
:=:=enum message
:=:={
:=:= MSG_OK,
:=:= MSG_TEST,
:=:= MSG_3,
:=:= MSG_4,
:=:= MSG_5,
:=:= MSG_6,
:=:= INVALID_MSG
:=:=}
:=:=gsm_rx_string()
:=:=
:=:=//Rx string from gsm: 'CR' 'LF' 'XXXXXXXXXX' 'CR' 'LF'
:=:={
:=:= MESSAGE_READ=0;
:=:= buffer_gsm[0]=0;
:=:=
:=:= buffer_gsm[0] = getc();
:=:= if (buffer_gsm[0] != '\r') // Find Carriage Return.
:=:= return;
:=:=
:=:= buffer_gsm[0] = getc();
:=:= if (buffer_gsm[0] != '\n') // Find Line Feed.
:=:= return;
:=:= i=0;
:=:= while(i<35)
:=:= {
:=:= buffer_gsm[i] = getc();
:=:= if (buffer_gsm[i] == '\r')
:=:= {
:=:= // terminate our string
:=:= buffer_gsm[i] = 0
:=:= MESSAGE_READ=1;
:=:= break;
:=:= }
:=:= i++;
:=:= }
:=:= return;
:=:=}
:=:=
:=:=enum message Check_GSM_String(char *s1)
:=:={
:=:= enum message msg;
:=:= char s2[10]; // This must be big enough including the NULL terminator
:=:=
:=:= for (msg=0;msg :=:= {
:=:= switch (msg)
:=:= {
:=:= case MSG_OK:
:=:= strcpy(s2, "OK");
:=:= break;
:=:= case MSG_TEST:
:=:= strcpy(s2, "TEST");
:=:= break;
:=:= case MSG_MSG3:
:=:= strcpy(s2, "MSG3");
:=:= break;
:=:= case MSG_MSG4:
:=:= strcpy(s2, "MSG4");
:=:= break;
:=:= case MSG_MSG5:
:=:= strcpy(s2, "MSG5");
:=:= break;
:=:= case MSG_MSG6:
:=:= strcpy(s2, "MSG6");
:=:= break;
:=:= default:
:=:= // we shouldn't ever get here! But if we do return invalid message
:=:= return(INVALID_MSG);
:=:= }
:=:= if (stricmp(s1, s2) == 0)
:=:= {
:=:= //The strings are equal so return which one
:=:= return(msg);
:=:= }
:=:= }
:=:= // We didn't find a valid message so return an invalid one
:=:= return(INVALID_MSG);
:=:=}
:=:=
:=:=:=ok Mark
:=:=:=i untherstood what do you mean, but i have a little difficoult to do this.
:=:=:=My strategy to decode message is this:
:=:=:=my modem message always is:
:=:=:='CR' 'LF' 'MESSAGE' 'CR' 'LF'.
:=:=:=With this information i'm working in this mode:
:=:=:=I'm looking for the CR and LF than i buffered the chars to next CR.
:=:=:=Now i have a buffer, how can i compare it?
:=:=:=
:=:=:=Tnx
:=:=:=
:=:=:=I'm attach the function:
:=:=:=
:=:=:==============================================================
:=:=:=gsm_rx_string()
:=:=:=//Rx string from gsm: 'CR' 'LF' 'XXXXXXXXXX' 'CR' 'LF'
:=:=:={
:=:=:= MESSAGE_READ=0;
:=:=:= buffer_gsm=0;
:=:=:=
:=:=:= buffer_gsm[0] = getc();
:=:=:= if (buffer_gsm[0] != 'CR') // Find Carriage Return.
:=:=:= goto exit;
:=:=:=
:=:=:= buffer_gsm[0] = getc();
:=:=:= if (buffer_gsm[0] != 'LF') // Find Line Feed.
:=:=:= goto exit;
:=:=:=
:=:=:=
:=:=:= i=0; // Buffered the string to next CR
:=:=:= do {
:=:=:= buffer_gsm[i] = getc();
:=:=:= ++i;
:=:=:= } while ((buffer_gsm[i-1] != 'CR') || (i<35));
:=:=:=
:=:=:=
:=:=:= if ((buffer_gsm[i-1] == 'CR') && (i>0))
:=:=:= {
:=:=:= MESSAGE_READ=1;
:=:=:= i=i-1; // Delete CR from string.
:=:=:= }
:=:=:=
:=:=:=exit:
:=:=:=
:=:=:=}
:=:=:=
:=:=:==============================================================
:=:=:=
:=:=:=
:=:=:=
:=:=:=
:=:=:=
:=:=:=:=Read the data into a buffer until you recieve the 'return char'. Then process the buffer using a string compare function:
:=:=:=:=
:=:=:=:=char string1[]="OK";
:=:=:=:=
:=:=:=:=if (stricmp(buffer, string1) == 0)
:=:=:=:={
:=:=:=:= //The strings are equal so do whatever
:=:=:=:=}
:=:=:=:=
:=:=:=:=or
:=:=:=:=
:=:=:=:=char string1[3]; // This must be big enough including the NULL terminator
:=:=:=:=
:=:=:=:=strcpy(string1, "OK");
:=:=:=:=if (stricmp(buffer, string1) == 0)
:=:=:=:={
:=:=:=:= //The strings are equal so do whatever
:=:=:=:=}
:=:=:=:=
:=:=:=:=:=Hi,
:=:=:=:=:=I'm searching a suggest to implement a decode serial ascii message on my firmware.
:=:=:=:=:=I have a modem connect on pic 16f877 uart and i have to decode the answer messages.
:=:=:=:=:=Example:
:=:=:=:=:=I sent a command to the modem with a printf string 'AT' and i must decode the answer 'OK'.
:=:=:=:=:=This message always end with 'return ascii char'
:=:=:=:=:=
:=:=:=:=:=How can i do?
:=:=:=:=:=Thank you
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516623

[mmanisse]

There is another compiler error

enum message Check_GSM_String(char *s1)
{
enum message msg; //Compiler error espect {????

char s2[10];
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516661

[Mark]

Look at the for statement. This board doesn't like the less than sign it should read

for(msg=0;msg "less than" INVALID_MSG;msg++)


Also note that there are some typo's in the switch statement. For example, MSG_MSG3 should have been MSG_3 but it doesn't really matter since you are writing your own enums. There was another ';' missing in there also.

Regards
Mark



:=There is another compiler error
:=
:=enum message Check_GSM_String(char *s1)
:={
:= enum message msg; //Compiler error espect {????
:=
:= char s2[10];
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516663