LCP2134 can't enter bootloader

Victoria-B — Sun, 05 Jun 2022 07:07:19 GMT

I was upgrading the firmware for the LCP2134 on a T962 Reflow Oven and I was having display problems with the new firmware (but that's an issue for another day) so I switched back to what I believed was the original firmware, provided here.

Now when I turn it on normally, it gives off a quick beep and the screen is just blank. Even worse, I'm unable to get back into bootloader mode using the wiki instructions for both manual and button-press methods. In Flash Magic I'm just getting that "Failed to autobaud" message. Crystal frequency is set to 11.059 MHz (and I don't understand if the fact that it automatically cuts it down from 11.0592 is causing problems, but that doesn't seem to affect anyone else).

Symptoms: When I turn on the machine, the screen is just blue and the board's LED is a bright solid red and the electronics fan spins continuously. Once n_RESET is grounded, the red LED becomes dim and the green front lights turn on, along with the oven fan and the heat. I believed that this was my "new original" firmware's bootloader mode, but this didn't work either. And grounding n_ISP doesn't seem to make a visible difference here. Releasing n_RESET brings the red LED bright again and the oven fan/heat/green lights all shut off. None of this seems to change the display.

I'm also trying various combinations of baudrate and erasing "entire device"/"sectors used by file" but the same message appears.

Any ideas on how I can get back into bootloader mode so that I can upload usable firmware?

LPC Microcontrollers中的主题 LCP2134 can't enter bootloader

LCP2134 can't enter bootloader