7 Dec
2008
7 Dec
'08
3:26 p.m.
Tony Duell wrote:
AVR will quite happily send you several kilos of dead trees detailing
all this and more, if you ask them. I find that since I'm generally
carrying several kilos of laptop already, the PDF editions will suffice.
On 6 Dec 2008
at 14:33, Kevin Schoedel wrote:
Can you program and debug either or both of these chips without
propietary hardware or software. In other words, is documentation for the
following availalbe (without signing an NDA, etc )
1) How to send/receive words to the chip (what lines to wiggle and how,
what voltages to apply, etc)
2) The binary instruction set
3) THe debugging commands/responses I don't know PIC, but for the AVR equivalent
the host requirements are an
RS-232 port and the ability to run gdb.
Later PICs have on-chip breakpoint debug
communication via ICD (a 3-
wire interface)--and there is the ability to run ICE4000.
There is at least one AVR open-source debug package that operates
through the SPI programming interface--using the same tool to program
and debug. Could I, if I wanted, make the programmer and write
the software from
scratch?
Since avr-gcc and avrdude are already available under the GPL and fully
documented, there's no real need to reinvent that particular wheel.
In short - if you wanted to program an AVR the "oldskool EPROM" way by
setting lines by hand and toggling VPP with a push switch, you could
(and I have seen this done!). It may be slightly more worth your time
and effort to learn how to use the existing tools ;-)
Gordon