topic Re: Help with ISP mode flash in LPC Microcontrollers

Help with ISP mode flash

agonzalez — Fri, 06 Jan 2017 16:40:29 GMT

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.

Re: Help with ISP mode flash

soledad — Wed, 11 Jan 2017 00:45:05 GMT

Hi,

Could you please try the following steps?

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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Re: Help with ISP mode flash

petervangrieken — Sun, 22 Jan 2017 18:46:00 GMT

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.

Re: Help with ISP mode flash

juanabelaira — Thu, 31 Aug 2017 07:46:50 GMT

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