Hallo
Im trying to get the USB Host on the LPC2478 to work. Im using the USBHOst lite sample from NXP.
I cant get the USB Host clock started.
Im setting the bit in USBClkCtrl register to start the clock. Then I poll the USBClkSt to see if the clock starts. It never does.
I have verified that the USB clock is at 48 MHz (Verified with the Peripheral->Clocking and Power control->Clock dividers.) The CPU clk is 72 MHz (Above the required 18 MHz for correct USB function). PCONP is set to enable the USB.
I have read the UM several time recarding the USB in the LPC2478.
Could it be any external HW thing? (Some signal missing to switch to USB Host mode?) Schouldnt the USB clock start any way?
/Thomas