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

[dean_sands]

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.

[xiangjun_rong · Accepted solution]

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.

BR

XiangJun Rong

[dean_sands]

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.