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Recent content by Encrypted

  1. E

    Impedance matching : Interesting Thomas Lee problem

    Read it again, he's saying that solution A is not optimal. "...engineer A can look forward to a long career at SubOptimal Products, Inc." The match is between a 50+j10 ohm source and 75 ohm load. The 25ohm resistor used by engineer A has been removed. Engineer B uses the -j10 capacitor to...
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    'Hello World' ARM assembly on Keil

    arm assembler hello world You can't use the semihosting SWI calls in the uVision debugger. Take out the SWI instructions and change the AREA sectionname to RESET and your code will build and run in the debugger. You'll see R0 getting loaded and compared, not very interesting but a sort of...
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    LCD without zero-Mikrobasic code for radio frequency control

    Re: LCD without zero Your "0" is getting overwritten by your final LCD_out statement. Try modifying the string txt1 before you output it: bytetostr(ValoreAdc1,txt1) if (ValoreAdc1<10) then txt1[1] = "0" endif LCD_out(1,10,txt1)
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    compile lpc2136 with IAR workbench output error

    error[lp011] The linker is telling you that you have 32Kb of RAM available but your program wants 39Kb of RAM and it wont fit. You need to reduce your RAM usage; check your code for large unnecessary buffers and try reducing your stack and/or heap. Take a look at your MAP file to see what's...
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    CRC-16 Porblem - I'm not getting the correct result

    Re: CRC-16 Porblem OK, your constants are getting placed in RAM and you don't have enough for the large table. You can either tell your compiler not to put constants in RAM or use the modified version of your code below with a shorter table but not as fast. /* CRC16 Definitions */ static const...
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    CRC-16 Porblem - I'm not getting the correct result

    fast crc16 0xa001 Hi, There are many types of CRC. It seems like your trying to generate Modbus CRC-16 but the code your using generates CRC-16 for the Atmel Jtag Mk. II (CRC-CCITT). See: https://www.lammertbies.nl/comm/info/crc-calculation.html?crc=030300050002&method=hex If you change your...
  7. E

    keil c (memcpy and fmod) problems

    keil missing function prototype? memcpy destination and source must be pointers. https://www.keil.com/support/man/docs/c51/c51_memcpy.htm fmod is in the math library, #include <math.h> and both arguments must be floats. https://www.keil.com/support/man/docs/c51/c51_fmod.htm
  8. E

    Sending a WAV file on a Serial Port (Streaming)

    1. 44100 x 16-bit samples each second = 705,600 bits x 2 for stereo = 1,411,200 bits (176,400 bytes) to store 1 second. 2. You can go as fast as you want as long as both ends can keep up, my PC supports 128kbps. 3. See http://www.st.com/stonline/books/pdf/docs/12522.pdf and...
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    Sending a WAV file on a Serial Port (Streaming)

    wav serial port I don't know what you mean by 'digital speaker' but you'll need 350kB of memory to buffer the wav if it's 16-bit stereo. You could send the wav to the uC and have the uC store it on an SD card. For the uC to play the wav you'll read it from the SD card and send it to the DACs...
  10. E

    Nested interrupts in ARM - don't work

    You need to acknowledge the interrupt before re-enabling interrupts. See: https://www.arm.com/support/faqdev/1456.html
  11. E

    not initializeable variable in AVR IAR C

    Define your variable with __no_init prefix.
  12. E

    Help, need LPC23XX evaluation board Schematic!

    lpc2368 schematic Here's the Keil schematic: https://www.keil.com/mcb2300/mcb2300-schematics.pdf
  13. E

    ARM lpc2129...How to useP0.28-P0.30 as GPIO?

    You need to set the PINSEL1 register to configure the pins as I/O, default setting is A/D Converter.
  14. E

    provide more then 32 i/o with 89c51

    i need more io pins You don't need 16 inputs to read your switches, you can do it with 8 i/o pins.
  15. E

    Using 16F877A Timer1 to count in 1 millisecond

    16f877a timer1 coding With a 20MHz clock and without prescaler (1:1), Timer 1 has 200nS resolution. It will have counted to 5000 when a millisecond expires!
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