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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| [SOLVED] bootloader re-entry |
 Posted: Fri Apr 15, 2011 12:27 pm |
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Hi There,
After long search, I finally got a bootloader for my 16f883. I can download it with MPLAB, then connect with Microchip's boot loader app from AN1310 just fine, download my user app and let it run. But I can't re enter a second time. I'm not getting that going, I have a reset_cpu() code like this in my user app (it is in main()):
| Code: | if (bit_test (RS232_ERRORS, 2) && !input (MCU2_RX)) {
break_cnt++;
if (break_cnt>=5000)
// if FERR bit set and pin C7 been low for about 5 seconds, reset to start bootloader mode !
reset_cpu ();
} |
Does anyone have a clue what my problem could be? I'm not sure what's wrong... :(
Thanks for hints & suggestions,
Ron
Last edited by cerr on Mon Apr 18, 2011 10:24 am; edited 1 time in total |
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| [SOLVED] bootloader re-entry |
| Posted: Mon Apr 18, 2011 10:23 am |
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Ok, I got it figured out, on the 16F pics, reset_cpu() only sets the PC to 0x00 but doesn't reset the registers and because I'm using int_rda in my application, i first have to disable the interrupts before i reset the chip, just to completely "clean up" the chip.
Now it works fine with below code:
| Code: | if (bit_test (RS232_ERRORS, 2) && !input (MCU2_RX)) {
disable_interrupts (int_RDA);
disable_interrupts (GLOBAL);
output_low(PIN_C1);
reset_cpu ();
} |
Using the bootloader from http://www.microchip.com/forums/m347843.aspx that complies with Microchip's AN1310. |
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