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  1. Re: HSEROUT of array of data with termination on a null

    Hi Tumbleweed,

    Looking at the DS (Pg 342 / Ex 21-1), the calc, using the crystal on this board:

    (((22,118,400 / 230,400) / 64) - 1) = 0.5

    When sent to the SPBRG, this will result in just 0
    ...
  2. Re: HSEROUT of array of data with termination on a null

    Ok, didn't go for the full 65,536 pages.

    Set initially to transfer 16 pages which brought it down to something considerably less.

    Then upped it to transfer 64 pages which only improved it by...
  3. Re: HSEROUT of array of data with termination on a null

    Quick update - thanks again Tumbleweed. Now running at 230.4k BAUD.

    Time for 256 MB download now at an estimated ~ 11.2 hrs.

    The bottleneck will be the handshake as I'm "requesting" each page...
  4. Re: HSEROUT of array of data with termination on a null

    Hi all again,

    I'll give that a shot Tumbleweed. Was wondering about possibly taking it higher. I'll give those parameters a shot. I'm hooking up to a FT231X chip on a small custom board. The...
  5. Re: HSEROUT of array of data with termination on a null

    Hi all,

    using:




    for cnt = 0 to 255

    while (TXSTA.1 = 0)
  6. Re: HSEROUT of array of data with termination on a null

    To all,

    MANY thanks for all your help with this guys. I have some data recovery to do on another project but will be back on this either tonight or over the next few days.

    I'm running this on...
  7. Re: HSEROUT of array of data with termination on a null

    Update:

    Currently, as a short term solution, outputting the array as 16x HSEROUTs of 16x pairs of hex digits. Crude, but functional, and VB is able to convert this data back to its integer format...
  8. HSEROUT of array of data with termination on a null

    Hi all,

    Having an issue with outputting data from a pic to PC via a USB-serial COM port.

    I have an array of 256 bytes (1048574 of these pages of bytes in fact!)

    What I'd like to do is...
  9. Multiple Block Write SD protocol issue

    1. Hi all,

    I've been working with SD cards for a couple of years now, but only using Single Block Write. I'm trying to get Multiple Block Write to work but it fails after writing the first set.
    ...
  10. Multiple Block Write SD protocol issue

    Hi all,

    I've been working with SD cards for a couple of years now, but only using Single Block Write. I'm trying to get Multiple Block Write to work but it fails after writing the first set.
    ...
  11. Replies
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    4,450

    Re: Overclock RTC?

    Many thanks all. I'll give it a shot when I return to work and see how I get on with this.

    Will let you know my findings. I know how important it is to post any resolutions on forums...

    Kind...
  12. Replies
    6
    Views
    4,450

    Re: Overclock RTC?

    Hi Henrik,

    Thanks for having a think. I have already used code to jump the clock to critical time points (just before a sleep routine/wake-up routine), but it's never a true substitute for...
  13. Replies
    6
    Views
    4,450

    Overclock RTC?

    Hi all,

    I have some circuits that are professionally made using an 18F26J53. I cannot remove the 32 KHz clock that is at the timer1 input pins. The chip's primary oscillator is a 16 MHz crystal....
  14. Re: I2C SDA not going to zero! 3.3V --> 1.14V !

    Many thanks for your reply. I'll try replacing the pull up res' but the sensors/PIC will be tricky. I don't think it's the res as the line is going high to 3.3V. As you rightly point out, there's...
  15. Re: I2C SDA not going to zero! 3.3V --> 1.14V !

    Many thanks for your reply. I'll try some more continuity tests. Not given up on this one yet.
  16. Re: I2C SDA not going to zero! 3.3V --> 1.14V !

    Many thanks for your reply. It's an 18F26J53. It's set for output so should automatically be digital. The firmware works on other board (identical). I may have to start removing components but...
  17. Re: I2C SDA not going to zero! 3.3V --> 1.14V !

    Yup, all components accounted for. I still need to have another good look at it but I've followed the track from PIC to all sensors on that data line through each Via, looking for possible shorts and...
  18. I2C SDA not going to zero! 3.3V --> 1.14V !

    Hi,

    I have a strange one... I have had some boards made up. Some work but one in particular fails to talk to some I2C sensors. The clock line is correctly jumping between 3.3V and 0V but the data...
  19. Re: Timer 3 config for HPWM using remappable pins

    ... perhaps I'm misunderstanding the use of the HPWM command?
    Is 'channel 2' on HPWM the same as using ECCP2?

    - Jimbo -
  20. Timer 3 config for HPWM using remappable pins

    Hi all,

    Hope everyone has their Xmas wishlist prepared for Santa :P

    Quick question... trying to use Timer3 on an 18F26J53 together with HPWM command to make an LED go dim/bright/dim/bright...
  21. Re: Strange I2C and serial behaviour.......

    Hi Dave,

    It's the line with the different variables that's the issue. I essentially just want to use one HSEROUT and output all the variables in one shot and then call the I2C bus and get more,...
  22. Re: Strange I2C and serial behaviour.......

    Edit: PIC18F2620 not 2820!
  23. Strange I2C and serial behaviour.......

    Hi all,

    I am using an 18F2820 clocked at 20 MHz, connected to an ADXL345 accelerometer and reading it as fast as I can and pushing the data out on the USART and looping back for more data. Code...
  24. Re: SD card / SPI. Not going idle after writing a SINGLE_BLOCK

    I'vefound that 1 gig cards will go to idle but 2 gig cards remain at ~7 mA!
  25. SD card / SPI. Not going idle after writing a SINGLE_BLOCK

    Hi,

    I've been playing around with micro SD cards for a few months now. One thing I've noticed now that I've had help getting the CPU to run at minimum speed and properly go to sleep (thanks...
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