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Patrick De Groote
03/06/07 11:07
Read: 1172 times

#134396 - partial answers
Responding to: Eugene Yong's previous message
Eugene Yong said:

2. If i am to use ASM to send out a byte of data out from the TxD (P3.1) to a modem.For e.g : i want to send the character "A" to a modem, does the command needed to be sent this looks like this?


euuh, no....


would be more appropriate, and don't forget to initialise your UART properly

If yes, how does the C Code counterpart of this line looks like? I can't think of it no matter how hard i tried, i already even googled for few hours but it's no avail.

Just read the manual of your C-compiler.

what about

sfr at 0x99 SBUF;

again, don't forget to initialize
(the above would be for the SDCC compiler)

3. If i were able to send out a byte of character successfully to the modem, let's advance the problem to next stage. This time i need to send a string of command to the modem to instruct it to dial a number instead of a single character. For e.g : "ATD1234567" where 1234567 is the telephone number. Can i use the similiar line:

MOV SBUF, #ATD1234567 ?

What's your prior exposure to programming of microcontrollers?

did you check on the definition of the MOV instruction?

if so, how many bytes can the instruction be?
How many bytes would "#ATD1234567" be?

Even in 'C' we are talking low level, byte oriented stuff.

That is all i need to know for now to kick off with my coding.

I don't think so :-)
You will need to get some basics first..

Read the tutorials on this site.



List of 72 messages in thread
Serial Communication Related Problem        Eugene Yong      03/06/07 10:49      
   partial answers      Patrick De Groote      03/06/07 11:07      
      Oh yeah, i forgot about that      Eugene Yong      03/06/07 12:09      
   FIRST, THEN, THEN, THEN      Erik Malund      03/06/07 11:10      
      A little bit of sarcasm as usual but often helpful      Eugene Yong      03/06/07 12:25      
         Proper baud rate...      Dave Brooks      03/06/07 12:52      
            baud rate      Erik Malund      03/06/07 13:01      
               calculator      Dave Brooks      03/06/07 13:11      
            modem is autobauding      Jan Waclawek      03/06/07 16:04      
               Noted      Eugene Yong      03/06/07 21:00      
   Some answers      Lynn Reed      03/06/07 11:14      
      Thanks for a patience reply      Eugene Yong      03/06/07 12:33      
   Nothing to add, but ...      Joseph Hebert      03/06/07 11:29      
      i second(ed) that motion      Erik Malund      03/06/07 11:44      
         My location profile?      Eugene Yong      03/06/07 12:38      
            with this known, it would do no good ...      Erik Malund      03/06/07 12:40      
               Radio Shack      Lynn Reed      03/06/07 12:45      
                  Even so      Neil Kurzman      03/06/07 20:44      
                     I can buy it from the local electronic shop      Eugene Yong      03/06/07 20:52      
            Sarcasm      Neil Kurzman      03/06/07 20:52      
               I agree      Eugene Yong      03/06/07 20:57      
      Thanks for understanding and recommendation! - NT      Eugene Yong      03/06/07 12:35      
      More info      Russell Bull      03/06/07 22:28      
         you need to understand the parameters.      Mike Stegmaier      03/07/07 06:28      
            "more valid" evidently means invalid      Erik Malund      03/07/07 07:04      
            not quite      Patrick De Groote      03/07/07 07:29      
               What a wonderful example that when total crap is s      Erik Malund      03/07/07 07:44      
                  lesson      Patrick De Groote      03/07/07 11:43      
            No, it doesn't      Andy Neil      04/03/07 00:37      
   TxD pin to TxD pin?      Eugene Yong      03/07/07 15:31      
      dte-dce-dce-dte      Patrick De Groote      03/07/07 16:00      
         Noted! Thanks!      Eugene Yong      03/07/07 16:20      
            same request question      Jecksons Ben      03/07/07 21:38      
      Meaning of "Transmit"      Andy Neil      04/03/07 04:37      
   same request question 2      Jecksons Ben      03/07/07 21:54      
   Initial command sending code; help me take a look!      Eugene Yong      03/09/07 01:50      
      Make it simple for yourself      Russell Bull      03/09/07 02:50      
         Why the need of circular buffer? Receiving?      Eugene Yong      03/09/07 04:05      
            polling versus interrupt      Patrick De Groote      03/09/07 05:17      
               Check OK string at RXD or DCD at interupt?      Jecksons Ben      03/09/07 21:27      
                  no good      Patrick De Groote      03/10/07 02:14      
                     Voice mode only! No data communication.      Eugene Yong      03/10/07 04:09      
                        you are missing the basics      Patrick De Groote      03/10/07 04:26      
                           NO carrier sent after DCD didn't found      Jecksons Ben      03/11/07 19:54      
                              I do not agree      Patrick De Groote      03/12/07 00:37      
                                 Interupt DCD signal for clear transmission      Jecksons Ben      03/15/07 01:15      
                        For Voice Dialling      Muhammad Fauzan      03/19/07 12:33      
                           and by the way      Muhammad Fauzan      03/19/07 12:36      
                           Sorry for multiposting      Muhammad Fauzan      03/19/07 12:58      
                           The ";" works but...      Eugene Yong      03/22/07 19:46      
                              ";" to return to idle state      Muhammad Fauzan      03/24/07 16:48      
                              +++ with 3 seconds no modem activity      Charles Bannister      03/25/07 03:41      
                                 +++ escape sequence      Andy Neil      03/25/07 07:07      
                                    Monkey See. Monkey Do.      Charles Bannister      03/25/07 08:14      
                                       Now monkey also understand?      Andy Neil      03/26/07 00:26      
                                 Are you mistaken?      Eugene Yong      03/25/07 23:36      
                                    I think so      Andy Neil      03/26/07 00:24      
            Circular buffers      Russell Bull      03/23/07 00:42      
               Initial code for receiving modem response      Eugene Yong      03/26/07 10:38      
                  don't fiddle with the timer, let it run      Erik Malund      03/26/07 10:43      
                     Understood, will run TR1 in global init, thx! - NT      Eugene Yong      03/26/07 10:48      
                  check this out, Eugene...      Dave Brooks      03/26/07 10:52      
                     Ah! Didn't know that! Thanks! -NT      Eugene Yong      03/26/07 11:09      
                     Code; modem commands & responses      Andy Neil      03/26/07 11:23      
   V.250 (formerly V.25-ter) - get it free!      Andy Neil      03/26/07 14:28      
   code,modem command and response      Jecksons Ben      04/01/07 20:20      
   system froze when connected to hyperterminal      Eugene Yong      04/02/07 13:39      
      Your code...      Russell Bull      04/02/07 23:48      
         It should not be a hardware problem since..      Eugene Yong      04/03/07 01:43      
            Not necessarily      Andy Neil      04/03/07 02:42      
      Just taking a stab at it...      Chris Singer      04/03/07 10:22      
         two 'ugly' guesses      Erik Malund      04/03/07 10:44      

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