sx key problem/question
stef
Posts: 173
Hi
I'm now playing with the sx tech board an the sx key to program him.
I took the items like diliverd and played with them. I cood program an go into debug mode. Everyting was working fine. The only thing I found a bit fridgile was the wy the key is pligged into th board. So I made a nice metal box to put the sx key in. One the one side I led the DB9 came true so I could plugg in the serial cableand on the other side I extenden the 4 pins with a little cable (+/- 15cm) with a vonnector on I could plug in the pins on the tech board. I can use the same connector when I need to program in cercuit. But then the problems began. I can program the sx. that is no problem but wen I enter debug mode It is always saying "IDLE" and alle the buttons are gray. I now redone everything and now everything is working again. I think it is because I extended the 4 pins.
Is somebody knowing why??? I dond't want to damage my sx key so I want to protekt him with an housing.
If it is not possible, has someone an other idea???
Stef
·
I'm now playing with the sx tech board an the sx key to program him.
I took the items like diliverd and played with them. I cood program an go into debug mode. Everyting was working fine. The only thing I found a bit fridgile was the wy the key is pligged into th board. So I made a nice metal box to put the sx key in. One the one side I led the DB9 came true so I could plugg in the serial cableand on the other side I extenden the 4 pins with a little cable (+/- 15cm) with a vonnector on I could plug in the pins on the tech board. I can use the same connector when I need to program in cercuit. But then the problems began. I can program the sx. that is no problem but wen I enter debug mode It is always saying "IDLE" and alle the buttons are gray. I now redone everything and now everything is working again. I think it is because I extended the 4 pins.
Is somebody knowing why??? I dond't want to damage my sx key so I want to protekt him with an housing.
If it is not possible, has someone an other idea???
Stef
·
Comments
when debugging an SX with the SX-Key, or when you supply a clock frequency from the SX-Key to the SX under test, signal frequencies on the SX-Key OSC1 pin can go up to 50 MHz, or even more but they are always 20 MHz when the SX-Key communicates with the SX under test in debug mode. So an additional extension cable between the SX-Key and the 4-pin header on the device under test may add too much additional capacitive load for the clock signal. While programming, the signal frequencies on the OSC1 and OSC2 pins of the SX-Key are much lower, so this explains why programming with the extension cable works but debugging fails.
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Greetings from Germany,
G
Do not extend the 4 pin header. Make a light adapter for the serial cable. Get rid of the box you put the SX in and make a cable that looks like the one in the photo I have attached. This way you can plug in the SX-Key to the circuit, but only have a small amount of weight hanging onto the SX-Key.
Thanks, PeterM
Thanks. That explais the behaver. I will adjust and get rid of the box.
Best reguards.
Stef