topic Re: LPC54608 usb_device_msc_sdcard_lite in the usb_examples has some questions in LPC Microcontrollers

LPC54608 usb_device_msc_sdcard_lite in the usb_examples has some questions

zhixiangzeng — Mon, 07 Aug 2017 06:14:18 GMT

Hi，friends。when I running the usb examples --usb_device_msc_sdcard_lite.In the "usb_device_config.h" , there are some configuration definitions of USB device config are not very clear.

1. what does the " LPCIP3511 "mean?
#define USB_DEVICE_CONFIG_KHCI (0U)
#define USB_DEVICE_CONFIG_EHCI (0U)
#define USB_DEVICE_CONFIG_LPCIP3511FS (1U)
#define USB_DEVICE_CONFIG_LPCIP3511HS (0U)

2.in the usb_device_msc_sdcard_lite demo ,about the sd clk config is

CLOCK_SetClkDiv(kCLOCK_DivSdioClk, 2U, true);
BOARD_BootClockFROHF96M();

but in the sd_fatfs demo about the sd clk config is

CLOCK_SetClkDiv(kCLOCK_DivSdioClk, 1U, true);
BOARD_BootClockFROHF48M();

I think this is all about SD card reading and writing, why is the clock configuration different？

Re: LPC54608 usb_device_msc_sdcard_lite in the usb_examples has some questions

soledad — Tue, 08 Aug 2017 21:07:15 GMT

Hi,

The USB controller driver implements the real send/receive function. Implementations are different
for different controllers. The supported controller drivers are KHCI, EHCI, IP3511HS and IP3511FS.

You can find more information about these controller drivers in the USB Stack Host Reference Manual and USB Stack Device Reference Manual, these document are located, after install MCUXpresso SDK at the path:

<LPCXpresso54608>\docs\usb

Have a great day,
Sol

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Re: LPC54608 usb_device_msc_sdcard_lite in the usb_examples has some questions

arno1 — Tue, 15 Jan 2019 12:11:46 GMT

Does anyone know where I can find the latest version of this document (USB Stack Device Reference Manual)?
I can't seem to find it in the MCUXpresso SDK I downloaded.

Re: LPC54608 usb_device_msc_sdcard_lite in the usb_examples has some questions

soledad — Tue, 15 Jan 2019 23:17:36 GMT

Hello,

There is a separate folder that you need to download from the SDK link,

Re: LPC54608 usb_device_msc_sdcard_lite in the usb_examples has some questions

arno1 — Wed, 16 Jan 2019 08:49:27 GMT

Thanks. I totally skipped that link because the SDK downloaded automatically.