hi, we desing custom pcb with k64, we are trying to communite via usb, when usb disk attached, i get USB_HostEventEnumerationFail, when i examine the signal with oscilloscope, i get such a signal. Do you have any idea about this problem ? ide : McuXpresso sdk : 2.8.2
已解决! 转到解答。
mcu : 144pin, MK64FN1M0VLQ12
we use external clock for usb and mcu. usb clk in : 47 - PTE26
we are only testing usb msd example.first we tested the code without any change on our circuit but did not work,
second we created a clean project for out 144 pin mcu and tested again(usb msd) but not a chance.
example working on nxp development board but not working our board. i want to know, is this usb signal correct ?
it works until this function( USB_HostEvent() ) and i get enumeration error.