Embedded Artists LPC4357 USB High Speed Issues

lpcware — Wed, 15 Jun 2016 16:42:26 GMT

Content originally posted in LPCWare by GTA on Thu Aug 01 15:49:46 MST 2013
Hello All,

I am using the Embedded Artists LPC4357 dev kit (this: http://embeddedartists.com/products/kits/lpc4357_kit.php) and LPCOpen v1.03 to create a USB High Speed device based on LPCUSBLib. Unfortunately the EA LPC4357 dev kit is not supported by LPCOpen, so I have taken the LPCOpen KEIL LPC4357 dev kit board code (keil_mcb_18574357) and adapted that to contain the minimal necessary setup code to be able to run a USB device (I did follow the LPCOpen board porting guide: http://docs.lpcware.com/lpcopen/v1.03/_l_p_c_o_p_e_n__b_o_a_r_d__p_o_r_t_i_n_g__g_u_i_d_e.html).

When trying to run e.g. the lpcusblib_GenericHIDDevice example code with the default USB High Speed enabled (USB_FORCED_FULLSPEED 0), device enumeration is very unstable and usually does not succeed. I also lose the debug connection (target poll failure). If I however force the device to Full Speed, everything works fine.

I have started to look at the USB clocking config in SystemSetupClocking() (in sysinit....c, where I have cut code from the KEIL template) and HAL_USBInit() (in HAL_LPC18xx.c), but I cannot really see what configuration(s) could cause the USB0 device controller to work fine in Full Speed but not in High Speed.

Any ideas?

topic Embedded Artists LPC4357 USB High Speed Issues in LPC Microcontrollers

Embedded Artists LPC4357 USB High Speed Issues