RE: Problems with IAR and programming

Hi Al

 

My difference in Vcc is very small as noted below. But I agree it is something between the 2 supplies that is causing the problem, as Emmett alluded to. I will try his suggestions and see how it goes. 

 

What is the SBW dongle you refer to in your email? 

 

Thanks

 

Peter

 

From: [email protected] [mailto:[email protected]] 
Sent: Saturday, 21 February 2015 9:55 PM
To: [email protected]
Subject: Re: [msp430] 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