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ecap inputs in f28m35h52f1problem

Tsfania Tsalisher
Prodigy 170 points

using pins 6,8,32,43,45 as ecap input in coresponding to ecap6,ecap5,ecap3,ecap1,ecap2 i cane musure 5 diferent PWM inputs. the mesuerment is very exact.

However, the signals are coming from radio transmiter and if the antena is close to the board (1 meter) the 5 ecaps show 0. when i look at the input signals on the ecap pins i see them clean and nice like ttl signals shuld be. (1-2 milisecond Hight 70 herz signals)

the signals are entering to the board via 74lcx244 buffer.

need advice since it is amazing.

Tsfania

  • 0
    Guru 20525 points

    Hi, Tsfania.

    Tsfania Tsalisher said:

    However, the signals are coming from radio transmiter and if the antena is close to the board (1 meter) the 5 ecaps show 0. 

    It sounds as if the board was at the minimum of a diffraction Fresnel zone ;-). Clarify, please, how you check your eCAPs (where you see "0", with what tool?), i.e. what do you mean under "the 5 ecaps show 0"?

    Regards,

    Igor