topic Re: LPC11U35 flashing in LPC Microcontrollers

LPC11U35 flashing

jakobberglund — Mon, 05 Jun 2017 11:08:04 GMT

Hi, I have an LPC11U35 with an bug in the firmware that have made the device stop responding. Now I need to find a way to flash the device again. The problem is that it's already an mass produced item but I do have all documentations for the pcb. Is there anything I can do to make it appear as a MSD? Or a way to connect SWD or JTAG to it?

If I have to solder to the chip that is okey.

Br,

Jakob

Re: LPC11U35 flashing

jeremyzhou — Tue, 06 Jun 2017 01:36:43 GMT

Hi Jakob Berglund,

Thank you for your interest in NXP Semiconductor products and

the opportunity to serve you.

The LPC11U3x series support USB ISP and UART ISP modes, if enters the USB ISP mode, the MCU will be enumerated as a Mass Storage Class Device when USB port connects a USB host interface.

You can also use the Flash Magic to program the LPC11U3x when choose the UART ISP modes, and you can learn the more detailed information via the link below.

Flash Magic - Welcome

Have a great day,

TIC

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Re: LPC11U35 flashing

jakobberglund — Wed, 07 Jun 2017 07:08:56 GMT

Hi thanks for your quick answer!

I installed the Flash Magic program. But I do not understand if I need any additional hardware or if I should be able to flash it over USB. And if it should be possible to flash it over USB what interface should i use?

As I said the chip is already installed in a product. So if I could flash over only USB that would be very good. But if not what hardware to I need and how can I connect it to my chip. The designer of the PCB did not add easy connections for SWD or JTAG :smileysad: but I could probably solder it in anyway if needed.

Jakob

Re: LPC11U35 flashing

jeremyzhou — Wed, 07 Jun 2017 08:54:29 GMT

Hi Jakob Berglund,

As you mentioned above, your board doesn't have the SWD or JTAG interface, however the USB port is available.

So you can follow the these steps to program the flash.

1. First, force the MCU enter the USB ISP by referring to the LPC reference manual, and the chip will be enumerated as a driver.

2. Double click the driver, you will find a bin file whose name is firmware, then copying a new application executable file to the driver after deletes the firmware file. After that, the chip is programmed by the new executable file.

Have a great day,
TIC

Re: LPC11U35 flashing

jakobberglund — Wed, 07 Jun 2017 09:13:30 GMT

I have tried to force the MCU into USB ISP by looking at this manual http://www.nxp.com/documents/user_manual/UM10462.pdf. But I do not understand what I have to do. I have looked at page 396 of that manual and I know pin PIO0_3 is high. But I think it ends up in executing code because it think that the code is valid.

Have I misunderstood something? I am new to the LPC chips.

Re: LPC11U35 flashing

jeremyzhou — Thu, 08 Jun 2017 03:11:38 GMT

Hi Jakob Berglund,

Thanks for your reply.

You need to pull the PIO0_1 low and pull the PIO_3 high to force the MCU enter the USB ISP, then you can update the application code via the demonstrated steps above.

Hope it helps.
Have a great day,
TIC

Re: LPC11U35 flashing

jakobberglund — Thu, 08 Jun 2017 08:41:19 GMT

Thanks a lot for your help! I managed to fixed my broken devices now :smileyhappy: You saved me a lot of money and time.