Hi Brad,
I think you've figured it out. There are lots of lost bits in my
memory, but reading the comments in the bootloader code it appears
that it expects the application to have put a jump to the start of the
application at address 0x02. That's not how I would have done it
today, but there may be reasons that I've forgotten.
The source for the bootloader is fairly well commented and is
available here:
--- snip ---
;Simple Intel hex loader/programmer.
;
;Programs a line at a time is into flash and then sends a single character
;response (following receipt of a carrage return). Host software must wait
;for the response before sending the next line.
;
;Loader is entered by holding the serial line in a space state while the
;PIC is turned on (or reset). If the serial line is in a mark state
;immediately after reset the normal application code is run.
;
;Modifications to application program to use loader:
; 1. Start startup at address 2 rather than zero.
; 2. Start application code after the end of loader.
; 3. Ensure only addresses below end of loader programmed by hex file
; are 2 (start vector), 3 and 4 (interrupt vector)
;
;Response after receiving a carrage return character:
;'B' - Begin sending (first line, no prior status to report)
;'P' - Programmed data Ok
;'E' - program Error
;'C' - Checksum error
;'S' - Syntax error (non-hex digit received)
;'I' - last record type Ignored
;'F' - Finished ... jumping to application
;'R' - program address out of range (probably the configuration word),
; record ignored.
--- snip ---
Good luck! We're all waiting on the edge of our chairs to hear if it
works or not!
73's Skip WB6YMH
On Mon, Sep 5, 2022 at 1:11 AM Bradley Andrews via groups.io
<kb9bpf@...> wrote:
Skip,
I have a question about programming, but first some background and a progress report:
- A couple weeks ago, after I’d gotten my boards, I programmed a PIC with picldr.hex using my Phyton ChipProg-40 and the DIP-to PLCC adapter. When I tried to connect the PC to upload the rest of the firmware through the Xcat PC software, it didn’t work, getting stuck waiting for the download request from the Xcat.
- So, I’ve built a programming adapter and had a go at it again. The programmer says the PIC programs OK and verifies OK. Then I try a read and it comes back all 0000. A re-verify comes back all 0000.
- I did some more reading, pulling down books that I haven’t looked in for 13 years. So it’s looking like the protect bit is set in the config register. I didn’t find - until just now as I’m thinking better (after some rest) - the place in the Phyton to set the device config.
- I found that the picldr.hex file puts 1F76 in location 2007, the config register, which sets the memory protection. I turned it off in the config and changed location 2007 in the program buffer and could read back the (now modified) picldr.hex code I programmed, but when I put the PIC in the Xcat in the Syntor X, and attempted to use the Xcat PC software to upload the v033 firmware, it still wouldn’t go past the stage of waiting for the download request from the Xcat even after power-cycling the radio.
So now my question to you, Skip, is this: What am I doing incorrectly? To quickly summarize what I’ve been doing: flash the picldr, then attempt to use Xcat PC to upload the v033 firmware.
Oh and FYI, the config bits are not OTP: they can be changed if you run a complete erase. So at least I’m not trashing $9 PICs while I learn.
Once I figure out how to correctly get the PICs programmed, I’ll be able to verify the proper function of the PCB, and then I’ll be able to share the fruits of my labors. I think I’m just missing some small but essential piece of the programming puzzle.
Thank for the help,
Brad KB9BPF
From: [email protected] [mailto:[email protected]] On Behalf Of Bradley Andrews via groups.io
Sent: Saturday, August 20, 2022 10:22 PM
To: [email protected]
Subject: Re: [xcat] DIY Xcats
I was writing the other while you were writing this. Sounds like I may have to build a programming adapter access the appropriate pins on the Xcat, like you did.
I need to have a think on it and do some reading so that I don't bother you or the group with my ignorance When I have more intelligent questions I'll come back. Thanks for your willingness to help!
73
Brad KB9BPF
On Saturday, August 20, 2022, 10:06:42 PM CDT, Skip Hansen <skip@...> wrote:
Hi Bradley,
It should be possible to combine the two hex files by just deleting
the end of file line in one and then appending the contents of the
other. On the other hand, just flashing both of them sequentially is
probably way easier than screwing around combining the files. Just
make sure you aren't doing a whole chip erase twice (grin).
The bootrom's hex file should contain the values for the PICs
configuration bits as well as the code. The configuration bits are
one time programmable if I remember correctly and they are not in the
application image. If the configuration bits aren't correct the
oscillator won't even startup.
73's Skip
On Sat, Aug 20, 2022 at 7:24 PM Bradley Andrews via groups.io
<kb9bpf@...> wrote:
Hi Skip, and thanks for the tips.
Yes, I did include the extra SIP resistor network. I also changed the two smaller SIPs to a single SOIC resistor network, included a couple extra bypass caps, and scooted things around slightly for space. And I changed the resonator to an SMT.
I'm attempting to attach a PDF of the schematic and the artwork for perusal. Only when I have confirmed that the circuit boards work will I post the ExpressPCB files. I don’t remember of this group allows attachments or not, but I'll try it.
Regarding programming, when you say "The two steps aren't necessary; you can flash everything in one go if you combine the hex files. I did it that way to test the serial port." Do you mean an overlay of the two? I haven't looked at PIC programming for a long time, and only did a couple easy things when I did do it. Back then I used a serial programmer from MBasic, if I remember correctly, and it used standard DIP sockets. I thought I'd use the Phyton because it I have a PLCC adapter for it, but it's made for the ZIF DIP socket on the Phyton, not regular DIP sockets. I'll have to get out the PIC docs again and study up on programming requirements before I waste a lot of people's time and patience asking questions I should figure out on my own.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Skip Hansen
Sent: Saturday, August 20, 2022 7:45 PM
To: [email protected]
Subject: Re: [xcat] DIY Xcats
On Sat, Aug 20, 2022 at 4:53 PM Bradley Andrews via groups.io
<kb9bpf@...> wrote:
Hi Skip,
Thank you for giving your blessing to those of us who are brave/crazy in this way. I’ve wanted to do this for some time but didn’t want to step on your (or Lee’s) toes.
Would you mind answering a couple questions for me?
1. How did you guys program your PICs? Did you do it in a stand-alone programmer before soldering to the PCB, or did you do it via the RS232 serial port on the Xcat?
Neither. The programming pins are available via a combination of the
accessory cable and the connector normally connected to the Syntor. I
connected the necessary pins to a PIC programmer and programmed the
bootloader. Once the bootloader has been programmed I flashed the
application firmware via the serial port. The two steps aren't
necessary; you can flash everything in one go if you combine the hex
files. I did it that way to test the serial port.
2. Regarding the Xcat firmware, xcat_v033/xcat.hex, if I wanted to program it in my standalone programmer before soldering, would I use ‘Standard/Extended Intel HEX (*.hex, *.mcs)’ whose checksum comes to 001EA2F4, or force it to read in Binary whose checksum is 000CF1CF? I don’t want to do it incorrectly and not find out until the PIC is soldered in place.
You need to program the bootloader first. In addition to the
bootloader itself there are configuration bits which are needed.
FYI, my programmer is a Phyton ChipProg-40.
I don't recall what my programmer was. It wasn't a Microchip product
and the company that made it when out of business long ago. If your
programmer supports the chip it should be fine.
I like ExpressPCB and that’s what I used to lay out my Xcat ‘clone’ boards. If it works, and I expect it will, I’ll have some spares available if anyone is interested in obtaining them (at my cost) and using them to assemble their own. I’ll also be happy to upload the ExpressPCB .sch and .pcb files to the file section of this group, if you give that your blessing, Skip. I’d be willing to provide programmed PICs for those who are interested, as well as the other parts, but only with your blessing, Skip.
That would be EXCELLENT !
Hopefully you've added the pullup resistors that we forgot !
73's Skip WB6YMH
