Hi,

I start to work on my own board to match my need, i would like to use mbed to build my program and download the bin (after bin2hex) to my board.

Thanks to Martin for is great help !

- On my own board i need more I/O than mBed, i would like to access to P0.20 and P0.21 (for example) of the LPC , how to access to other LPC1768 i/o with mBed compiler ?

- Are you already try an FTDI 232 (Usb/Serial bridge) conected to the TXD0 and RXD0,  DTR to /Reset (pin 17) and RTS to /ISP (P2.10 / pin 53) to access to the ISP with flashmagic  ?

Something like this could be work with LPC1768 ?

Thank you,

Chris

Hi Chris's (Hmm... everyone on this thread is Chris)

I;ve recently added FTDI header and JTAG headers to the reference design :

http://mbed.org/cookbook/Reference-Design

Also, My notebook page covers ome of the issues you might face in bringing up your own PCB.

http://mbed.org/users/chris/notebook/prototype-to-hardware

Hope that helps.. shout if any of that should be revised/improved

Cheers,
Chris

Hi Chris and Chris ;-)

Chris, thank you for your "pins connection defines" ! really nice and very useful for my project.

Chris, thank you too for the reference design !

Only RXD0 and TXD0 with ISP to ground to enter in ISP mode -> really great news

Chris... i have a question : could your really sold the 83848J with hand soldering with ease ? i have not an reflow oven (for the moment).

Thank you again Chris and Chris.

Chris ;-)

Hi Chris,

Hmmm.. I havent actually tried to solder a DP83848J, but if I were doing it i'd use solder paste and a hot air gun. I use a hot air gun to reflow LPC1768s, mainly to remove them from PCBs, but i'd be fairly confident that with a little time and care, it should be possible. Of course, you could always switch to the DP83848C (as used on the original LPC2368 mbed). This is basically the same part, but in a TQFP package, might be easier than the QFN package of the "J" variant.

Hope that helps,

Chris

Hi Chris,

Sorry to hi-jack the thread (temporarily) but it is kind-of related - please feel free to make it into a different thread if that's more suitable!

Are there any other PHY devices that will be supported by the current libraries? If I understood the schematics correctly, you're using the RMII interface so would any other RMII-compliant PHY be suitable?

Or do we need to stick with the Nat Semi device?

We use a Micrel PHY (KSZ8041) on our other LPC2xxx boards and I was hoping that this may be an option for our own LPC176x-based board design (just starting to prototype parts of it with mbed before going to a custom board).

If there are other know options, can these be listed somewhere please? I know it's not a major goal to support other boards at the moment, but it would help to make a very useful development tool even better!

Any info would be most helpful!

Cheers,

    JezC

Chris Styles wrote:

Hi Chris,

Hmmm.. I havent actually tried to solder a DP83848J, but if I were doing it i'd use solder paste and a hot air gun. I use a hot air gun to reflow LPC1768s, mainly to remove them from PCBs, but i'd be fairly confident that with a little time and care, it should be possible. Of course, you could always switch to the DP83848C (as used on the original LPC2368 mbed). This is basically the same part, but in a TQFP package, might be easier than the QFN package of the "J" variant.

Hope that helps,

Chris

 

Hi Chris,

I will update my eagle file to the DP83848C version, thank you for the tips.

TQFP are easy to sold with hand soldering and flux, but i think to buy a pro tool to sold compoment now...

Thank you !

Chris.

Hi Chris,

I just modify your lbr and sch to add the DP83848C device (LQFP-48) and switch from the "J" to "C" version on my eagle scheme, connect an RJ45 connector with built-in transformers and leds (MagJack from Sparkfun lbr).

I need to add signals on the "C" Version : Power_Down (pin 7), RESERVED@6 (pin 20), RESERVED@7 (pin 21), 25Mhz_Out (pin 25), Led_Act (pin 26), IOGND@1 (pin 35).

I try to place new signals to limit the differences beetween the "C" and "J" version.

I could send to you the modified lbr and the .sch, it's an un tested design for the moment, but i hope to start the routing off all my board next week-end ! Hope the "C" version work exactly like the "J" version...

About Leds, why leds signals are routed to the LPC1768 ? mBed use them to check something ? how-to use leds on my RJ45 plug too ? (sorry i'm a mBed rookie).

Chris (the "frenchie").

Hello Chris Styles and Chris The Frog and all other Chris.

Im another Chris (Chris Cuebler from Hungary) :)

I build an own board, and i tryed using DP83848VV (Have JTAG), and the PHY is not work. When i download a sample program with eth specific headers (libs), the software is maybe freez in eth init because the first program code in mian is a serial fprint and that is not received.

the significant difference between C and I version of PHY only the JTAG port, and the power down pin (pin 6..12). (all JTAG pin is disconnected in the board)

can you help me?

thanks..

ps.: Sorry for my hungaryan english.... i still a developing..