topic Re: LP1768 / DP83848 , Hangs on initialization, possible 2 traces flipped. in LPC Microcontrollers

LP1768 / DP83848 , Hangs on initialization, possible 2 traces flipped.

lpcware — Wed, 15 Jun 2016 17:55:34 GMT

Content originally posted in LPCWare by defcon8 on Mon Mar 14 13:37:46 MST 2016
Hi,

I am trying to write software for a new designed board. It has the NXP LPC1768 and DP83848 Phy. The microcontroller crashes when i try to initialize ethernet. Even JTAG connection is lost. I traced it down to this part in code, after the reset method it hangs:

/* Basic Ethernet interface initialization */
void Chip_ENET_Init(LPC_ENET_T *pENET, bool useRMII)
{
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_ENET);
resetENET(pENET);

We use LPCXpresso Pro and LPCOpen. Code is build upon the FreeRTOS_Webserver example. I am not a hardware engineer, the board was made by some other person. When i look at the schematics, i think there are 2 lines flipped.

LPC1768 PIN 43 P1(27)/CLKOUT/USB_OVRCR/CAP0(1) ==> DP83848 PIN 29 RESET
LPC1768 PIN 44 P1(28)/MC2A/PCAP1(0)/MAT0(0) ==> XTAL_OSC_DX057 (50MHz) PIN 1 INH

Since i'm not a hardware engineer, i am not sure this is correct and have my doubts about it. Is there anybody out here that can confirm that this is a hardware design "mistake"? And is there a way to flip these 2 signal pins in software?

This is my first embedded project so any help is appreciated.

Thank you,
Regards,

Bastiaan

Re: LP1768 / DP83848 , Hangs on initialization, possible 2 traces flipped.

lpcware — Wed, 15 Jun 2016 17:55:35 GMT

Content originally posted in LPCWare by defcon8 on Thu Mar 17 10:57:02 MST 2016
Anybody? Can use a bit of help here :(

Re: LP1768 / DP83848 , Hangs on initialization, possible 2 traces flipped.

lpcware — Wed, 15 Jun 2016 17:55:36 GMT

Content originally posted in LPCWare by DF9DQ on Thu Mar 17 19:31:37 MST 2016
This happens if the LPC doesn't get the 50 MHz clock signal.
I guess the "INH" controls the activation of this oscillator, so try changing the level of that signal before attempting Ethernet initialization.

Re: LP1768 / DP83848 , Hangs on initialization, possible 2 traces flipped.

lpcware — Sun, 19 Jun 2016 01:05:07 GMT

bump