Do without AVR bootloader

[Ken Forgettable]

With the addition of a single resistor and a short header cable I think it should be possible to ICSP the AVR using USB.

[dmitri]

It should.

[Ken Forgettable]

Well what about one less resistor?
Using Synthex v2 schematic where P - ICSP_18F2550 and A - ICSP_Atmega
+ Cut out R8.

P.1 to A.4
P.4 to A.1
P.5 to A.2
P.6 to A.3

I asked the bus driver - he said it would work

[dmitri]

I asked the bus driver - he said it would work

And I agree with him.

[Ken Forgettable]

And I agree with him.

You speak Polish?

And while we're at it, what about moving LED contol to the PIC

[dmitri]

And I agree with him.

You speak Polish?

Very little.

And while we're at it, what about moving LED contol to the PIC

If there is a reason for this explained in simplified English.

[Ken Forgettable]

If there is a reason for this explained in simplified English.

The PIC does the MIDI and the LED is a MIDI indicator!

But what I'd really like is to get access to is TOSC1 - maybe dump the XTAL parts too?

Sleep on it eh?

[EDITED]
TOSC1 - er, XTAL parts! wrong thread I became deranged!

[dmitri]

Until somebody implements "bit banging" or Atmega SPI protocol in PIC18F2550 firmware, the bootloader stays put and the MIDI LED along with it.

[Ken Forgettable]

[EDITED]

Until somebody implements "bit banging" or Atmega SPI protocol in PIC18F2550 firmware...

Code: Select all

if (msgparsestate==MSG_IDLE){
        ch=uart_getchar(1);
}else{
        ch=uart_getchar(0);
}
// parse message according to appl. note AVR068 table 3-1:
if (msgparsestate==MSG_IDLE && ch == MESSAGE_START){
        msgparsestate=MSG_WAIT_SEQNUM;
        cksum = ch^0;
        continue;
}

More of this clean looking code at http://www.tuxgraphics.org/common/src2/article05101/

[Ken Forgettable]

I wonder what Atmel are up to?

Anyway, I think somebody could implement PS2 'intellimouse' input on the PIC too

Just two buttons and the scroll wheel would be needed from code like http://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2004/jcc72/code.html