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pau
Joined: 18 Nov 2008
Posts: 8
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| Tiny bootloader problem |
 Posted: Thu Sep 03, 2009 3:11 am |
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I use Tiny for programming the PIC18F452 and it works when I use a crystal of 4 Mhz, but I've tried with a 10 Mhz crystal and it doesn't work.
I've changed the xtal line, in the bootloader file, like this:
| Code: | ;xtal EQU 4000000
xtal EQU 10000000 |
I've programmed it, but when I try to send the hex file with the bootloader, it sometimes says that doesn't find the pic, just when I power up the device, and others ones says:
pic sending unknown data: "K" <> 0h=
Check baudrate & Start Write while PIC is not sending serial data (e.g. in reset)
ERROR!
I think I don't have to change the line of the oscillator type, is it true? Because a 10 Mhz crystal is also a HS oscillator.
Thanks |
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pau
Joined: 18 Nov 2008
Posts: 8
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| Posted: Fri Sep 04, 2009 1:58 am |
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I can't believe nobody use tiny bootloader.
In this case, do you use any other bootloader for PIC18F452? |
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meereck
Joined: 09 Nov 2006
Posts: 173
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| Posted: Fri Sep 04, 2009 9:59 am |
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When compiling the tiny bootloader, the following has to be modified according to your needs:
LIST P=18F2420 ; change also: Configure->SelectDevice from Mplab
xtal EQU 20000000 ;
baud EQU 115200 ; the desired baud rate
do not also forget to modify fuses
CONFIG OSC = HS, FCMEN = ON, IESO = ON, PWRT = ON, BOREN = OFF, WDT = OFF, MCLRE = ON, LPT1OSC = OFF
CONFIG PBADEN = OFF, CCP2MX = PORTC, STVREN = ON, XINST = OFF, DEBUG = OFF, LVP=OFF
Use OSC = HS for crystals >4Mhz
OSC = XT for crystals <=4Mhz
cheers |
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