topic Re: Migrating from LPC11U68 to LPC54114: What's different with USB? in LPC Microcontrollers

Migrating from LPC11U68 to LPC54114: What's different with USB?

dean_sands — Fri, 06 Oct 2023 14:49:57 GMT

I'm porting our existing code from the LPC11U68 to the LPC54114.

Here's what I have so so far:

Changed the ROM ptr to 0x03000200 so USBD_API will work.
Enabled the VBUS
Setup the USB parameters and descriptors
Initialized via USBD_API->hw->init()
Setup the CDC parameters and descriptors
Initialized via USBD_API->cdc->init()
Enabled the USB IRQ via NVIC_Enable

It's not working yet, and I don't know why.

Two things I noticed after my coworker took back the board is that I wasn't setting the USB IRQ priority and that USB_IRQHandler() changed to USB0_IRQHandler().

I'll try it again when I'm set back up.

Update: Still not working, but I've also disabled the power-down with POWER_DisablePD().

I'm working through the lpcxpresso54114_rom_dev_cdc_bm example and it's way easier to understand than the weight scale example I started with.

Re: Migrating from LPC11U68 to LPC54114: What's different with USB?

xiangjun_rong — Mon, 09 Oct 2023 07:21:56 GMT

Hi,

If you want to usb port for LPC54114, you have to enable the usb clock.

1)pls use the code to enable usb clock

SYSCON->AHBCLKCTRL1|=1<<25;

2)you have to set up the USB clock to be 48Mhz before you call the usb code in ROM

Pls have a check.

XiangJun Rong

Re: Migrating from LPC11U68 to LPC54114: What's different with USB?

dean_sands — Mon, 09 Oct 2023 21:38:51 GMT

Thanks for the response. It turns out that our board is using the other VUSB pin. After modifying the code to use Pin 1.11, the firmware works and I can use the USB device.