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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| bootloader<->user application configuration |
 Posted: Mon Jun 06, 2011 3:51 pm |
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Hi There,
I'm using the AN1310 1.05 bootloader from microchip for my application which is running on a PIC18F86K22. Now, the bootloader seems to work fine, i can connect and succesfully download my application. Then when I run it, it seems like the baudrate is messed up, as i can't read anything anymore on my serial console :( How can I make sure that the bootloader doesn't change the settings in my user app or better how can i make sure that my application configuration gets written once the bootloader finishes/my app is launching. It works just great with out a bootloader...
Help, hints and suggestions are appreciated!
Thank you,
Ron
PS: I wrote a little test app to verify that it's not my app that does things crazy. The test app looks like this:
| Code: |
#include <18F86K22.h>
//#device ICD=TRUE
#case
#device adc=16 HIGH_INTS=TRUE
#fuses NOWDT
#fuses HSH //Hi-Speed crystal oscillator
#fuses NOBROWNOUT //No brownout reset
#fuses NOPLLEN //No PLL enabled
#fuses BBSIZ1K //1K words Boot Block size
#fuses NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#fuses PROTECT
#define PC_RX PIN_G2
#define PC_TX PIN_G1
#define BAUDRATE 9600
#use delay(clock=20000000)
#use rs232(baud=BAUDRATE,parity=N,xmit=PC_TX,rcv=PC_RX,UART2,bits=8,stream=PC, ERRORS)
void main (void)
{
while (1) {
fprintf (PC, "Hello World!\r\n");
delay_ms(500);
}
}
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Posted: Mon Jun 06, 2011 4:29 pm |
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I've been trying to figure out what I need to reset from my user app, have tried this so far with no success... :(
| Code: |
#bit PLLCFG = getenv("bit:PLLCFG")
#bit PLLEN = getenv("bit:PLLEN")
#byte SPBRG2 = getenv("sfr:SPBRG2")
#byte SPBRGH2 = getenv("sfr:SPBRGH2")
#byte OSCCON = getenv("sfr:OSCCON")
#byte OSCCON2 = getenv("sfr:OSCCON2")
void main (void)
{
PLLCFG = 0;
PLLEN = 0;
SPBRG2 = 0;
SPBRGH2 = 2;
OSCCON = 104;
OSCCON2 = 0;
...
..
...
}
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Any idea what register I might be missing?
Thanks,
Ron |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Tue Jun 07, 2011 6:58 am |
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| Depending on the bootloader configuration, application #fuse setting may be possibly ignored (e.g. when setting the USE_SOFTCONFIGWP switch). In this case, the fuse-settings of the bootloader would be used and oscillator frequencies can be different from what you expect. You should check this. |
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Posted: Tue Jun 07, 2011 10:37 am |
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| FvM wrote: | | Depending on the bootloader configuration, application #fuse setting may be possibly ignored (e.g. when setting the USE_SOFTCONFIGWP switch). In this case, the fuse-settings of the bootloader would be used and oscillator frequencies can be different from what you expect. You should check this. |
Exactly, that's why I tried to restore the fuse settings in main by using the sfr directives but there must be more than what I have now...and i'm not using the USE_SOFTCONFIGWP switch....  |
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