Help with ISP mode flash

[agonzalez]

Hello, I am trying to regain access to target MCU. I've read this: 

Regaining debug access to target MCU &  ISP Reset over debug.

I know that the 1549 is in ISP mode because I'm monitoring the signal activity on the pins and everything goes quiet after pressing and releasing Reset while holding ISP0 & 1. So I get that far. But while entering a debug or flash session I still don't get anywhere.

Debug error: 

Flash Error:

Any help with regaining access would be appreciated. There's 3 boards that are locked up from this same error and I've really been spinning my wheels on this for some time now.

[petervangrieken]

When keeping ISP0/1 both low, the LPC1549 uses the uart for programming. You should use flashmagic (Flash Magic - Welcome ) to download you hex file over the uart using an usb-serial convertor.

[juanabelaira]

Thanks to this, I saved a board and potentially others. I wonder why it's so relatively easy to brick them

[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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