Re: Problems with IAR and programming

I haven't used a FET board for a while, but I recall thaqt several of 
them used to have this issue if there was a slight difference in Vcc 
levels, very slight. The same doesn't occur with the SBW dongles, they 
live quite happily with joint supplies and a 0.6V differecne in Vcc, 
though I wouldn't recommend this. I can't find my FET documentation at 
the moment, but I seem to recall there was a resistor you could change 
that would allow the FET board to handle this.

Al

On 21/02/2015 3:42 PM, 'Peter Grey' [email protected] [msp430] wrote:
>
>
> I have a target board with a MSP430FR5729. I am using IAR EW6.5 and a 
> MSP430-FETUIF. I have a MSP-TS430PW28 connected to the FET module and 
> 4 wires going to my target board (Vcc, ground, Test, RST). I have used 
> this sort of setup many times. My target board has a 12V input and it 
> generates 11volts to be used on board to generate 3.3V and a few other 
> DC voltages. When I connect the cable from the PW28 board I can 
> program the board and run it. If I connect the 12 volts to my target 
> board the IAR crashes and I have to turn my PC off and on. When the 
> 12V is not on the Vcc is 3.32V and if I have the 12V connected and no 
> FET the Vcc is 3.29V. I cannot see any shorts to ground and the whole 
> target board draws 17mA when no high power devices are connected (3G 
> modem). I can program in a led flash and this will work with no 12V 
> connected. If I remove the FET and apply power the fled will flash. It 
> seems the program runs but it will not download the program when I 
> have the 12V connected. I checked the notes from TI and can see no 
> hints as to what is happening.
>
> Any suggestions?
>
> TIA
>
> Peter
>
>
>
>