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  1. Re: 12C fails on first attempt, then works fine...

    I don't think it is the resistors. I've used 100k before and it's been OK. I also tried different values in parallel with the 22k resistors to bring the pullup values down. Issue remains.

    I've...
  2. Re: 12C fails on first attempt, then works fine...

    I have 22K pull-ups in place. I know that value is a bit high, but slowing down the transmission rate does not help.
  3. 12C fails on first attempt, then works fine...

    I'm trying to communicate with a Micro Crystal RV-1805-C3 real time clock using a PIC12LF1840. This RTC has a high impedance pin that can be employed to switch off everything but the clock and then...
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    Re: SDHC (FAT32 for SD cards)

    But what about the posts above. Looks like some folks had a FAT32 library working. Am I missing something?
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    Re: SDHC (FAT32 for SD cards)

    I'm having the same problem described at the end of this (dead?) thread. Was there ever a solution? BTW, I had it working for FAT16 - so hardware is probably OK.

    Thx
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    Re: HPWM on PIC18F125K22

    Thanks Henrik. Following your suggestions, I got it to work on PORTB.3. The crucial thing I was missing was the CCP2MX bit.
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    HPWM on PIC18F125K22

    I've got an existing/working device on which I need to implement a simple temporary pulse series using the hardware PWM. I'm trying to use the HPWM command to no avail. The device is a 28-pin...
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    Re: PIC18f25k22 help with OSC configs

    Not sure what you are getting at, Wayne. Yes, all the code is there. The 1 Mhz default condition might explain why the PIC seemed to operate at 1 Mhz when I specified the wrong OSC configuration (XT...
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    Re: PIC18f25k22 help with OSC configs

    Nevermind. Figured it out 5 minutes later. I needed to specify a high speed, high power oscillator and I had to turn off the clock multiplier thingy. In other words:


    _CONFIG _CONFIG1H,...
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    PIC18f25k22 help with OSC configs

    This is a case of trying too many new things at once. I'm using a PIC18f25k22 (a new device for me) with a standalone, 3-pin 20 Mhz oscillator (also new to me - see photo), and PBP 3 (new to...
  11. um...can I delete this thread?

    So I just discovered that I was displaying data incorrectly. I should have been using REV 8 to flip each byte around so the entire bit sequence would be ordered correct. I did this and found that...
  12. Reading in Biphase - I thought this would be easy

    Long ago I made a simple PIC based RFID reader that used an atmel u2270b front end for the RFID communication. This device works quite well for EM4001 RFID tags which produce a manchester output...
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    Thanks Darrel

    Thank you Darrel. I still cannot figure out the CRC process, but I had no trouble getting your subroutine to work. So I am just going to purloin what you have written and stop thinking about it for...
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    Help with CRC checksums

    OK. It's almost 3 am, and I am stuck. Anybody familiar with CRC error checking?

    I have data coming into a PIC-based RFID reader, and I am trying to work out a way to do error checking using the...
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    Acknowledge polling

    tenaja,

    I looked into acknowledge polling. I get the concept, but it seems way more expensive than a pause. You gotta have a loop with a shiftin or I2Cwrite command right? Is there a cheap way to...
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    Good advice

    Thanks for the tips guys.

    Brian, I did some testing a long time ago and got the impression that the PIC10 did not retain RAM in deep sleep (WDT disabled etc). The drain from the EEPROM was a...
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    Pushing the limits of a PIC10F222

    I am working on some tiny dataloggers--these things weigh less than a raisin--and I have had great success with several PICs (12Fs and 16F688). To miniaturize things even more, I've been trying to...
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    Not everything works

    Hey Charles. Thanks, but I don't think it is that simple. I have a 'no name' serial to USB cable that works with other devices, but not with the PIC/MAX232 setup. One of my collaborators reported...
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    cables ordered

    Well, I'm not attempting bootloading, just serin and serout. I'm just gonna buy a few cables and see what works. The option I will put forth to users first is to get a PC card with a com port....or...
  20. Hmmm...Ok but.....

    Thanks for the heads up, Mtripoli. I haven't yet done this simultaneous programming (5 devices only) extensively, but it has worked about 20 times in a row with no problems. Although I have verified...
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    Serial to USB cable - varying results

    I would like to use a Serial to USB cable to communicate with a PiC16F688 which is running through an RS232 type level converter (actually an ICL2323). If I do straight serial communication with a...
  22. Yahoo!!!

    Thanks everyone. That was just the help I needed. Based on your stories, I built a jig that parallels the output of a pickit 2 to 5 PIC16F688s. Works great. Thanks for adding years to my life.
  23. Simultaneous programming of multiple pics - is it possible?

    I've found myself in a position where I will often need to program up to several hundred pics. This is not enough to purchase them preprogrammed but enough to make for considerable tedium. Does...
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    Code explosion

    Thanks Dave. I think that may have been the problem. Unfortunately, when I added those line (using GPIO instead of PORTA) the size of the compiled program increased quite a bit. Too much for me to...
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    I2C with a PIC10F222 - is it possible

    I've been trying to implement I2C communication with a PIC10F222 and an EEPROM with no success. I've reached the end of my mental resources (it was a short trip), and hope that someone in...
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