Set the id by a code on unused GPIO (if any). 5 spare bits will give you 32
ID's. So the devices location on the board defines it's id.
Dan Miner wrote:
Yes, this sounds like it will work for me. Thanks for the
information.
I'll need 2 or 3 connectors but that's lots better than 16 to 20
of them. FYI - I found the gang programmer specification here:
http://focus.ti.com/lit/ug/slau101a/slau101a.pdf
I haven't had time to read it all yet (I'll do that tomorrow).
But after a quick look, it seems that the same program image
needs to go to all devices. I was hoping to have a different
image for each device. Specifically, 99% of the code is the
same with a device ID in Flash or EEPROM. I need to have each
device know which one it is on the board.
Any ideas on that? If the programmer can't support it
directly, I'm sure I'll think of something...
- Dan Miner
-----Original Message-----
From: Steve Underwood [mailto:ste...@coppice.org]
Sent: Tuesday, January 27, 2004 5:35 PM
To: mspgcc-users@lists.sourceforge.net
Subject: Re: [Mspgcc-users] Programming multiple MSP430's on a board
Hi Dan,
TI sell a gang programmer which does basically what you want for
production. It keeps most of the JTAG lines common for up ro
8 devices,
and uses just one special wire for each device to select
which one gets
programmed. This idea could be extended to a greater number
of devices.
The development tools, on the other hand, do not currently
support this
type of operation. They are designed for one-to-one
connections between
the JTAG tool and the device. If you can live with a
connector per MCU
for development, naybe this will work out OK for you.
Regards,
Steve
Dan Miner wrote:
I have an application where I'll have multiple MSP430's on
the same board. Since the programming interface is JTAG it
should be a trivial matter to daisy chain the chips together
so they can all be programmed from a single connector.
I don't have the space for one connecter per MSP.
However the word I got from TI is that their software doesn't
support this. Does anyone know a way to do this? Does the
mspgcc tool set support this? If not, can someone add this
functionality to the tool set?
I'll have prototype hardware in a week or two. For software
development, we added a connector per MSP, but we'll need to
get rid of those for production.
FYI - The production boards will have 16 to 20 MSP430's on
them so the connectors take up a LOT of space.
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