Andy Green wrote: > I don't know what all the constraints were for making that external jack > method in the first place,
I have yet to see a good reason for it :-) > but it would be far simpler if we can communicate with the GSM chip > UART fully internally somehow Way too sophisticated :-) There's exactly one time in the life of the phone when this interface is used, and that's during calibration at the factory. We can use test points on the PCB and a fixture with the corresponding pogo pins. > We should not connect JTAG to MSP430 and just have JTAG on CPU. We can > program the MSP430 using a UART connection. Hmm, I'm curious what made you change your mind on that. To me this looks like we're planting a big fat wart on a previously beautiful solution. I guess Milosch must have told you something scary ... :-( > Well we can make a debug connector how we like for the prototype, but > what we need is the FTDI chip on there with USB connection of its own to > drive the CPU JTAG and provide console. Yup. I don't think we want to invent any new debug connector. If there's anything else we need, we're better off if this goes to test points and then a fixture. We should develop these fixtures (Milosch's design that can be easily produced in small series) in parallel to the main PCB. - Werner
