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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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 Posted: Fri Mar 11, 2011 11:15 am |
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I got microchip application note AN1310 working fine on my 18f87k22 on the picdem pic18 explorer demo board. I can properly enter the bootloader mode by selecting the "break" button in the delivered software which pulls pin B1 to GND. This works well but when I manually hook pin B1 up to GND and reset the PIC, it won't enter the bootloader mode, i'm not getting it! Why does this not work? by pressing the "break" button in the pc software, we're setting the RTS pin which again is connected to reset pin B1....
same manually isn't working - that may also be the reason why I can't get the CCS bootloader working for me... any clues?
Thank you! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Mar 11, 2011 5:36 pm |
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I don't have your PIC, but I was able to make it work with an 18F45K22.
To make it work, I had to do this:
1. Edit Ex_Bootloader.c as shown below in bold:
| Quote: |
#elif defined(__PCH__)
#include <18F45K22.h>
#fuses HSH,NOWDT,NOPROTECT,NOPLLEN
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#endif
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and also in this section:
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#if defined(__PCH__)
#org 0x40,0x9F // *** WAS 0x7F
#else
#org 0x20,0x3F
#endif
void main(void) {
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2. Edit the Ex_Bootload.c file as shown below in bold:
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#elif defined(__PCH__)
#include <18F45K22.h>
#fuses HSH,NOWDT,NOPROTECT,NOPLLEN
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#endif
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(Note: This is a different file than Ex_Bootloader.c)
Then use TeraTerm to follow the instructions in this link exactly:
http://www.ccsinfo.com/forum/viewtopic.php?t=40920&start=1
If it doesn't work, possible reasons are:
1. You forgot to select the correct PIC in the MPLAB Configure/ Select
Device menu, for both programs. In my case, this is 18F45K22.
2. You forgot to add the NOPLLEN setting to the #fuses in both files.
3. You forgot to enable Xon/Xoff in TeraTerm, in the Setup / Serial Port/
Flow Control window. Note: TeraTerm doesn't retain this setting when
you shut down the program, unless you specifically "save" the settings.
It won't work without Xon/Xoff enabled and it is very easy to
shut down TeraTerm, start it back up, and forget to re-enable Xon/Xoff.
4. You forgot to unplug the ICD2 after programming Ex_bootloader.hex
into the PIC, or you forgot to jumper pin B5 to ground, or you forgot to
press the reset button on the board prior to downloading the application
program.
5. You accidently used TeraTerm to send the source file of the application
program, Ex_Bootload.c, instead of the hex file, Ex_Bootload.hex. |
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