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:[email protected]]
> Sent: Tuesday, January 27, 2004 5:35 PM
> To: [email protected]
> 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.
