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Recent content by C-Man

  1. C

    Unable to stop Interrupt

    Try the following inside your Interrupt routine: if (INTCONbits.INT0IF && INTCONbits.INT0IE) instead of if (INTCONbits.INT0IF) Reason: the interrupt flag will always be set even if you disallow INT0IE and get into the interrupt routine via your timer interrupt (TMR0IF). I hope this will help...
  2. C

    Why is this code not working ???

    Try the following: printf("AT+CMGS=28\n\r");// this is working Most modems check this number (should be your resulting message lenght in octects). You do not need to care for the OA in your message as this is an ASCII code and not a control code. I hope this solves your problem. best regards
  3. C

    opera 9.25 & Hotmail?

    A friend of mine had the same problem, after installing V 9.51 everything is working again. hope this helps
  4. C

    P89V51RD2 and P89C51RD2 problem

    Hi try switching off the bootrom of 89V51RD2 Definition for FCF (Keil C51) sfr FCF= 0xB1; place this at the start of main() FCF=1; hope this helps
  5. C

    serial flash AT45DB041B

    Take a look at these old posts: maybe they can help you get started best regards
  6. C

    Siemens A52 -- ATMEGA16

    siemens a52 Siemens A series support AT commands but do not support sending SMS via AT commands :cry: best regards
  7. C

    FREE source code of USB 2.0 device driver

    user jjohn has been banned a long time ago
  8. C

    Interface Siemens A50 with Microc.

    at command+a50 @suriadin01 what sense does it make to answer a 2 years old thread??
  9. C

    Does Siemens s35 support AT commands?

    Re: siemens s35 Yes it does but you have to use 19200 baud 8 bit no parity 1 stopbit best regards
  10. C

    Problem with using Siemens C55 mobile with 8051

    Re: help,, siemens C55 Do you mean original Siemens data cable?
  11. C

    Problem with using Siemens C55 mobile with 8051

    siemens serial cable voltage The phones operate at 3 volts. What level converters did you use? You can not directly connect to 5 volts driven lines. Could try using series connectors 22k in each line connected to the phone (except GND). hope this helps and best regards
  12. C

    Using ULN2003 to drive a bipolar stepper motor

    uln2003 example Yes this is OK ULN2003 is open collector driver. Do not forget to use pullup resistors (for example 4K7 to +5V) as 8051 can not source enough current to switch ULN2003 when fully loaded. best regards
  13. C

    Summer Time -- BST=GMT +1

    https://wwp.greenwichmeantime.com/time-zone/rules/eu.htm best regards
  14. C

    Help me creat a 40 bit variable for PIC18LF8722

    Re: 40 bit Variable gravi i do not understand your problem If you add 2 24 bit numbers it can never overflow a 32 bit value. Example: binary 111111111111111111111111 = hex FFFFFF adding 111111111111111111111111 = hex FFFFFF gives hex 1FFFFFFE But this only takes 25 bits of the 32 bit...
  15. C

    Problem with making an array of 256 characters in a PIC877 based unit

    Re: pic ram memory ..... volatile because it is changed from an interrupt function and persistant because i do not need the array initialized to 0 by the startupcode this saves a bit of codespace. You could leave out static but i do not want the buffer to be visible to another program module...
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