PIC bootloader problem [SOLVED]

Testing/Troubleshooting
1

Hi there.

I have a core board, which if I load the MIDI echo hex file, echo very nicely whatever I send it.

However, if I load the bootloader : bootloader_v1_2b_pic18f452.hex using winpic, I keep getting the following messages on my input :

00000001620872 ms | [90 78 20] Channel 1: Note On C9 velocity: 32

00000001620873 ms | [C8 01 00] Channel 9: Program Change no: 1

00000001620874 ms | [C8 3F 00] Channel 9: Program Change no: 63

00000001620874 ms | [FF] System Reset

00000001620874 ms | [A0 78 20] Channel 1: Aftertouch C9 pressure: 32

00000001622765 ms | [C8 01 00] Channel 9: Program Change no: 1

00000001622766 ms | [C8 3F 00] Channel 9: Program Change no: 63

00000001622766 ms | [FF] System Reset

00000001622766 ms | [A0 78 20] Channel 1: Aftertouch C9 pressure: 32

I expect the sysex message, but dont get it.

Any pointers ?

Thanx

Thys

2

Hi vattern,

it looks like the wrong MIDI baudrate is selected. Maybe the ID header hasn’t been programmed, or some bytes are swapped (see also http://www.midibox.org/dokuwiki/doku.php?id=jdm_with_winpic800)

An “all-zero” ID is a save value

Best Regards, Thorsten.

3

Thanks for the quick response Thorsten

Dumb question , but what should the bits be set to ? (Default config)

I have two config words I can set. when I load the code into the programmer, they show up as FEFF and FFF3.

Is this correct ?

Thanks

Thys

4

no, these are the flags for various hardware options (e.g. oscillator selection, brownout voltage, code protection). These two words should never be changed.

The ID field is a number with 16 digits (8 bytes). It is “all-1” after erase, and if it won’t be programmed, you will notice exactly the described effect.

I just have downloaded WinPIC and searched for a possibility to change the ID field. It seems that the GUI doesn’t allow this. But under “Device->Program ID locations” you can program it, propably with the values which are embedded in the .hex file (and in this file I’ve written the all-zero header)

So, just try this function, hope that it helps.

If not, the “TEST SW2” workaround of the MIDI troubleshooting page could help

Best Regards, Thorsten.

5

Hi Thorsten

I got the problem solved by using ICProg.

In order to use ICProg under XP I had to use porttalk and allowio to get access to the parrallel port.

Thanx

Thys