Greatings,

A month ago I was playing with a costum PCB for the lpc11u24. I did not have any time so I droped the project for a while. Now I am working on it again. I bought a QFN64 PCB and soldered a lpc11u24 on it like this :

Than I connected the pins to my mbed 11u24 like this,

MBED       ==connected to==  IC
#################################################
p30(isp)   ==connected to==  PIO0_1 (pin 5)
p29(reset) ==connected to==  RESET/PIO0_0 (pin 4)
p9(TX)     ==connected to==  RXD/PIO0_18 (pin 61)
p10(RX)    ==connected to==  TXD/PIO0_19 (pin 62)
GND        ==connected to==  (pin 19)
VOUT       ==connected to==  (pin 10) 
GND        ==connected to==  (pin 7)

and upload the code from http://mbed.org/users/chris/notebook/prototype-to-hardware/ while carefully changing the pins if necessary. I double checked everything. For now I am only trying to get the synchronized message from the lpc11u24 without succes. I did not use any capacitors because I am powering the lpc11u24 directly from the MBED (I guess it is safe...).

For now it is not working. I guess I am missing something important...

any hint would be great.

Thanks.

From the photo i cannot see, BUT, have you fitted a 12.00MHz crystal, with its own caps (12pF * 2)

I have been promising myself to do this with LPC11U24,

But i did make this one earlier. (in true blue peter fashion)

Ceri

Hi Ceri,

thanks for your reply. I am glad to see that you have made a similar board. To answer your question, I did not use a crystal because this is only for usb porgramming (as far as I understand) and I am trying to use the ISP.

By the way, tell me Ceri, it seems like you are not using caps on your board (so do I for now because I just want to test...) It seems like, there is no big problem... Isn't it?

thanks.

you should always. use caps

probably. not too clear but they. are there

but they. are there look at the second photo the blobs that look like shorts... actually 0402 Caps. B-)

I think USB Programing needs a crystal, serial programing might not ???

I think there's. another thread with details of it

hope this is usefull!

Ceri