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ADC sample time varies whle using USB HID rpotocol

Question asked by kamran sial on Apr 2, 2014
Latest reply on Apr 8, 2014 by CarlosCasillas

I am using Kiel uvision for arm bare metal example project of  usb device with K20 72 Mhz.I have configured hid to 1 endpoint to send adc data to PC. hid binterval time is 1ms after every 1 ms the PC sends in token to kinetis controller and controller sends 64 bytes of adc data to pc. I have set adc on continuous conversion in interupt mode if i do not connect controller to pc the sample time of adc remains constant but when i connect controller to pc the samples time varies about 10 usec. i want a constant sample time of adc and usb communication in hid

mode together.