Diego Fainstein

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8 years ago.

Why USBHID doesn't work with FRDM-K64F?

I switched from a FRDM-KL25Z to a FRDM-K64F to try the mbed-cli and started experimenting with a blinky program. When I add a USBHID device, the blinky stops working. At first I thought it was a problem with the mbed-cli, but then I realized that with the online compiler the program also fails. Is the FRDM-K64F incompatible with the (USBDevice) USBHID library?

The program is:

testing USBHID on a Blinky

#include "mbed.h"
#include "USBDevice/USBHID/USBHID.h"

DigitalOut red(LED1);
USBHID hid(8,8);

int main() {

  while(1) {
    red = 0;
    wait(0.5);
    red = 1;
    wait(0.5);
  }
}

When I comment line 5 (the USBHID one) the program works. The program also works if I change the line to:

USBHID hid();

---- Edit:

It seems that the USBDevice library is only compatible with FRDM-KL25Z, LPC1768 and LPC11U24 according to https://developer.mbed.org/handbook/USBDevice. How are we supposed to use the USB on the FRDM-K64F?

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