LPC MicrocontrollersのトピックRe: avoiding LPC51U68 enter to ISP mode

avoiding LPC51U68 enter to ISP mode

gschelotto — Thu, 13 May 2021 15:22:15 GMT

Hi,

I'm afraid my LPC51U68 is entering to ISP mode and I see in the UM the next statement:

How can I do this?

regards,
gaston

Re: avoiding LPC51U68 enter to ISP mode

ZhangJennie — Fri, 14 May 2021 07:03:36 GMT

What specific problem do you have?

Can you access debug via SWD?

Can your board enter ISP mode?

Did you set CRP in source code?

Thanks,

Jun Zhang

Re: avoiding LPC51U68 enter to ISP mode

gschelotto — Thu, 20 May 2021 09:44:50 GMT

Hi,

What specific problem do you have?

Pin2 (PIO0_24) is stuck at 0V after reset and I cannot toggle this digital output to high.

Can you access debug via SWD?

Yes, there is no problem with this.

Can your board enter ISP mode?

I would say no since PI00_31 = 3.3V at Power Up through a 47k pull-up .

Did you set CRP in source code?

regards,
gaston

Re: avoiding LPC51U68 enter to ISP mode

ZhangJennie — Mon, 24 May 2021 09:53:32 GMT

I read your description I wonder the problem is not related with CRP but on your code.

Do you use a custom designed board or NXP demo boa? Could you please try to debug a MCUXpresso SDK demo led_output to check if it can blink a gpio correctly? If you have NXP demo board, it's good to test led_output on demo code as well.

Thanks,

Jun Zhang