If you haven't already, you can verify the Palm is connection with your
device by using a program like SimpleTerm.
Make sure the API calls return correctly. You are not checking SerOpen's
return value or SerReceive's. Also look at the serial port sample code
available from the various Palm web sites. Get Neil Rhodes book (I guess
Glenn Bachman's will work also)
-----Original Message-----
From: Allen Yang <[EMAIL PROTECTED]>
To: '[EMAIL PROTECTED]' <[EMAIL PROTECTED]>
Date: Friday, August 27, 1999 12:47 PM
Subject: RE: Please help with serial communication
>hi, Dave:
>Thanks again for your help.
>In fact, I did declare memory for buffer.
>What I did was that
>
>unsigned char x_source[512]; //declare x as memory for data
>
>And in function
>static void do_channel() //in the function, I was calling for getting data
>from PC
>{
> Err serror;
>// unsigned int x;
> unsigned char COMM_REQUEST;
> unsigned char SAMPLE_READY_FLAG;
> UInt temp = 0;
>
> SysLibFind("Serial Library",&SerL);
> SerOpen(SerL,0,4800);
> for (temp = 0; temp<2; temp++)
> {
>
> // SerReceiveFlush(serial_lib,0);
> if (temp == 0) {
> Get_Buffer_Data(1,25,x); // x is passed to function
> SAMPLE_READY_FLAG = 0;
> SerReceiveFlush(serial_lib,0);
> }
> else
> Get_Buffer_Data(1,25,x);
>
> }
>
> Handle_Old_MF_Data();
>
> SerSend(serial_lib,"LDUOK",5,&serror);
>}
>
>static Boolean Get_Buffer_Data (unsigned char buffer_num,unsigned int
>num_bytes , void * buf )
>{
> Err serror;
> unsigned char buffer_sent;
> char* bufchar;
> num_bytes = 25;
>
>
> SerReceive(serial_lib,buf,num_bytes,SERIAL_TIMEOUT,&serror);
> SAMPLE_READY_FLAG = 1;
>
> bufchar=buf;
>
>
> StrPrintF(reading_buf,"%s",bufchar);
> fieldptr_ldu_ch3v = FrmGetObjectPtr(FrmGetActiveForm(),
>FrmGetObjectIndex(FrmGetActiveForm(), fieldID_ldu_ch3v));
> FldSetTextPtr(fieldptr_ldu_ch3v, reading_buf);
> FldRecalculateField(fieldptr_ldu_ch3v, true);
>
> return 1;
>}
>
>Rignt now there is one strange thing happen. No matter what kind of data I
>type into PC (letters or numbers), there is number "1" which always appear
>in the field I define. I don't understand at all, and I don't know what is
>happening when I try to pass character or number to palm pilot.
>
>Would you mind give me some hint for this??
>
>Thank you
>
>Allen
>
>-----Original Message-----
>From: Dave Lippincott [mailto:[EMAIL PROTECTED]]
>Sent: Friday, August 27, 1999 11:47 AM
>To: [EMAIL PROTECTED]
>Subject: Re: Please help with serial communication
>
>
>>static Boolean Get_Buffer_Data (unsigned char buffer_num,unsigned int
>num_bytes , void * buf )
>The pointer passed as buf must point to memory, not just another pointer.
>
>Good:
>char MyBuffer[128];
>
>Get_Buffer_Data(x,127,MyBuffer);
>
>Bad:
>char *MyBuffer;
>
>Get_Buffer_Data(x,127,MyBuffer);
>
>
>If buf points to a pointer without enough memory allocated, the best you
>could hope for is strange results, the worse would be a program that
crashes
>constantly.
>
>
>-----Original Message-----
>From: Allen Yang <[EMAIL PROTECTED]>
>To: '[EMAIL PROTECTED]' <[EMAIL PROTECTED]>
>Date: Friday, August 27, 1999 10:36 AM
>Subject: RE: Please help with serial communication
>
>
>>Hi,Dave:
>>Thank you for your email. I am not sure how to find the memory? Would you
>>mind explain to me more?
>>
>>Thank you.
>>
>>Allen
>>
>>-----Original Message-----
>>From: Dave Lippincott [mailto:[EMAIL PROTECTED]]
>>Sent: Friday, August 27, 1999 9:03 AM
>>To: [EMAIL PROTECTED]
>>Subject: Re: Please help with serial communication
>>
>>
>>Another thing to look at: you buffer variable...where are you allocating
>>memory for it? The buffer is not allocated memory by SerReceive.
>>
>>-----Original Message-----
>>From: Allen Yang <[EMAIL PROTECTED]>
>>To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
>>Date: Thursday, August 26, 1999 8:18 PM
>>Subject: Please help with serial communication
>>
>>
>>>Hi,
>>>I tried to get some data from PC. And my code just won't work. anyone can
>>>help me with it?
>>>
>>>static void do_channel()
>>>{
>>> Err serror;
>>>// unsigned int x;
>>> unsigned char COMM_REQUEST;
>>> unsigned char SAMPLE_READY_FLAG;
>>> UInt temp = 0;
>>>
>>> for (temp = 0; temp<2; temp++)
>>> {
>>>
>>> if (temp == 0) {
>>> Get_Buffer_Data(1,25,x); // this is the function for
>>>getting data
>>> SAMPLE_READY_FLAG = 0;
>>> SerReceiveFlush(serial_lib,0);
>>> }
>>> else
>>> Get_Buffer_Data(1,25,x);
>>>
>>> }
>>>}
>>>
>>>static Boolean Get_Buffer_Data (unsigned char buffer_num,unsigned int
>>>num_bytes , void * buf )
>>>{
>>> Err serror;
>>> unsigned char buffer_sent;
>>> char* bufchar;
>>> num_bytes = 25;s
>>>
>>>
>>>
>>> SerReceive(serial_lib,buf,num_bytes,SERIAL_TIMEOUT,&serror);
>>> SAMPLE_READY_FLAG = 1;
>>>
>>> bufchar=buf;
>>>
>>> StrPrintF(reading_buf,bufchar);
>>> fieldptr_ldu_ch3v = FrmGetObjectPtr(FrmGetActiveForm(),
>>>FrmGetObjectIndex(FrmGetActiveForm(), fieldID_ldu_ch3v));
>>> FldSetTextPtr(fieldptr_ldu_ch3v, reading_buf);
>>> FldRecalculateField(fieldptr_ldu_ch3v, true);
>>>
>>> return 1;
>>>}
>>>
>>>I really don't know what is wrong with my code, and what is the problem ?
>>>
>>>Please help me out.
>>>
>>>Thanks ad advance.
>>>
>>>Allen
>>>
>>
>>
>>
>
>
>
