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+--- Thread: 18F25K20 again ? (/showthread.php?tid=2250)
18F25K20 again ? - Mr_Booo - 2014-06-06
I am stumped.
I got this bootloader going on a 16F887 and a 18F14K22.
I have been struggling with the 18F25K20 for 3 days now. The GUI simply does not recognise the chip. I checked weather PLL was enabled but it seems not to be the case. I used an osciloscope to chect the tx output but I cant make sense of it.
None of the previous posts on the same chip has helped.
What am I missing ?
Thanks for a great bootloader.
RE: 18F25K20 again ? - Mikael Gustavsson - 2014-06-07
I cannot spot any problem with your code. I assume that the uart is working in your application. Try these changes:
1.
-change baud rate to 9600
2.
-enable brg16
3.
-change baud rate to 9600
-enable auto baud rate detectio in both fw and gui
4. Check oscillator frequency. Test code is available in ds30loader.s:
Code:
; Toggle pin, frequency on pin = PIC frequency / 16
if 0
bcf TRISx, TRISxx
tsfloop bsf LATx, LATxx
bcf LATx, LATxx
bra tsfloop
endifRE: 18F25K20 again ? - Mr_Booo - 2014-06-08
Hi.
I feel kinda stupid, but I have to say a BIG THANKS Mikael.
It turnes out that the MAX3232 chip I was using simly looped back EVERYTHING sent to it from the terminal. So everytime I do a loopback to test the serial port by shorting out TX and RX on the 3232 it would work and I would asume everything is ok.
I wrote a program for the pic to send acending numbers to the terminal and when that did not work I found the problem with the 2323.
Thanks again for a great bootloader, your advice and support.
RE: 18F25K20 again ? - Mikael Gustavsson - 2014-06-09
Hi,
Thank you for the update and feedback.