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Recent content by vikrant

  1. V

    how to use sprintf in sdcc for folating point variables

    sdcc sprintf hi all, i am doing some floating point calulation in p89v51rd2 uC in sdcc compiler it is happenning properly. But i want to use sprintf for floating point operation. ex. float f1 = 1.23; char buffer[10]; sprintf(buffer,"%f", f1); but buffer...
  2. V

    free Jtag debugger for Keil (Evaluation Version)

    keil evaluation version hi All, I want to develop a project using LPC2138 microcontroller with Keil (Evaluation version) and I am using GNUARM. Since in Keil website they mentioned the Limitations for Evaluation tools, but for ARM Evaluation Tools they mentioned "The GNU ARM tools...
  3. V

    Problem in setting Double Clock using IAP calls

    hi all, I want to program p89v51rd2 to double clock using IAP calls. I am able to do Read , Write and Erase using IAP calls (CALL 01FF0H). But when I want to enable double clock option by setting DPL = 0x05 and R1 = 0x05 and calling CALL 01FF0H control is not coming back after this...
  4. V

    How to implement IAP in p89v51rd2 (8051) microcontroller

    8051 iap hi all, I want to implement IAP(In Application Programming) for p89v51rd2 microcontroller can any one provide me the source code for that.
  5. V

    Problem in communicating with AT88SC0104C (Crypto Memory).

    crytpo at88sc0104c address hi all, i have interfaced p89v51rd2 microcontroller with AT88SC0104C but the device is not responding ACK for 1st Write operation. I m using i2c (synchronou) protocol and trying to Read Config Zone. I checked RST,CLK,IO and GND pins are properly connected and i...
  6. V

    Problem in communicating with AT88SC0104C (Crypto Memory).

    hi all, i have interfaced p89v51rd2 microcontroller with AT88SC0104C but the device is not responding ACK for 1st Write operation. I m using i2c (synchronou) protocol and trying to Read Config Zone. I checked RST,CLK,IO and GND pins are properly connected and i m sending the...
  7. V

    how to use Telepphone API in windows

    hi friends, Can anybody tell me how use TAPI functions lineInitializeEx , lineAnswer and linedrop Regards Vikarnt
  8. V

    how to use sdcc in uC having more than 1K bytes of RAM.

    how to use sdcc hi all, I am using Philips p89v51RD2 microcontroller and SDCC compiler. This controller has 1K of RAM size but still sdcc compiler is giving Error due to overflow of memory size, I think sdcc still taking Maximum RAM size to 128 bytes, Error which is given by sdcc is...
  9. V

    how to set OCR1A in ATmega1280

    ocr1a hi all, I am using ATmega1280 uC. I am configuring timer1 for 1 sec tick but not able to write OCR1A register. actually i tried it in debugging mode using JtagIce mkII . I am writng hex value 0x1C20 to OCR1A register but only OCR1AL is updated with the value 0x20 .the higher...
  10. V

    timer isr for 1 sec tick.

    hi all, I am using ATmega1280 microcontroller with a external crystal of 7.3728 Mhz . IDE which I am using is AVR and WinAVR compiler. I have written a timer ISR for timer1(16-bit), this timer I am using in CTC mode (Clear Timer on Compare Mode). Initial settings are...
  11. V

    Programming utility in IAR Embedded Workbench?

    hi all , I am using IAR Systems Embedded Workbench 4.0 Evaluation version. Can anybody tell me where is the programming utility. If they are in this IDE or I have to install some driver to get programmer software.
  12. V

    atmega1280 timer and interrupt example code

    atmega1280 hi all, I am using ATmega1280 uC and IAR Embedded Workbench IDE for programming and simulation. I have written a LED blink program that is working fine . I have written interrupt based code for USART and Timer but those are not working fine, when i simulated timer is not...
  13. V

    how to display custom character in lcd 16x2

    16x2 lcd custom characters hi friends, I have interfaced hitachi HD44780 lcd (16x2) with AT89s52. I want to display custom character or user defined character ex. ARROW, BOX,SMILEY. Can any body give me the code for that or atleast give me the correct algorithm or seudo code. this...
  14. V

    simulation of lcd on memory in keil

    hi friends, Can any one tell me how to simulate LCD 16x2 in User memory space (U:0x0000 to U:0xFFFF) in keil with the help of .ini file or some configuration file. I know some technique is there but i dont know exactly. plz help me
  15. V

    how to configure a port as i/p or o/p.

    hi friends, I want to know how to make a port as i/p or o/p. its fine that we have to configure the port before using but what is the logic behind assigning values 00H or FFH to make a port as i/p or o/p. I am using a 245 buffer which is interfaced with Port 0 of...
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