How to erase flash on LPC1549?

[agonzalez]

Hi, 

So I recently programmed an LPC1549 and somewhere along the way it's causing hangups to I can't write over it.

I'm fairly certain this line of code is what caused the issue: 

LPC_SWM->PINASSIGN9 &= 0x1301FF00;

 Specifically "0x13." I've tried changing it back to anything else, but I get the following error message:

So I'm resorting to erase the flash memory on the 1549, but there's no clear instructions that I've found so far. 
Can someone help me to simply erase the memory so I can just start with a blank slate again and reprogram the device? 

[soledad]

Hi,

Could you please try the following steps?

1. Power off first
   2. Connect ISP pin to GND
   3. Connect RST pin to GND
   4. Power ON
   5. Wait 5~10 sec
   6. Disconnect ISP pin to GND ----> Keep power ON
   7. Disconnect RST pin to GND ----> Keep power ON
   8. Programming ----> Still power ON

Please let me know if this helps!

Have a great day,
Sol

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[converse]

Read this: https://community.nxp.com/message/630748?sr=search&searchId=2c80c229-9681-45e5-869e-6fff6d0d73ad&sea... 

[agonzalez]

Thanks for replying, Con Verse.

I've read that, as well as ISP Reset over debug. According to that page:

The LPC-Link2 ISP Reset functionality does not work with LPCXpresso1549 Rev. B boards. It does work with Rev. C boards.

A debug ISP Reset will not be able to recover a system in Deep power down mode.

I just happen to be using the 1549 rev B board. There's 3 boards with me that have all been locked because of this.

Is there an alternative to recover from here? I've also tried vector catch but that didn't do it.

[converse]

Use reset and isp buttons, if present. If not, you will need to get access to the pins on the chip...

[agonzalez]

Could you please elaborate? I understand pressing and releasing reset while ISP0 and 1 are held down, but then what? I've attempted using flashmagic and lpcxpresso to erase but neither responded. I got the same error. "ee(36)Could not connect to core."