1What: /sys/bus/iio/devices/triggerX/master_mode_available 2KernelVersion: 4.11 3Contact: benjamin.gaignard@st.com 4Description: 5 Reading returns the list possible master modes which are: 6 - "reset" : The UG bit from the TIMx_EGR register is 7 used as trigger output (TRGO). 8 - "enable" : The Counter Enable signal CNT_EN is used 9 as trigger output. 10 - "update" : The update event is selected as trigger output. 11 For instance a master timer can then be used 12 as a prescaler for a slave timer. 13 - "compare_pulse" : The trigger output send a positive pulse 14 when the CC1IF flag is to be set. 15 - "OC1REF" : OC1REF signal is used as trigger output. 16 - "OC2REF" : OC2REF signal is used as trigger output. 17 - "OC3REF" : OC3REF signal is used as trigger output. 18 - "OC4REF" : OC4REF signal is used as trigger output. 19 20What: /sys/bus/iio/devices/triggerX/master_mode 21KernelVersion: 4.11 22Contact: benjamin.gaignard@st.com 23Description: 24 Reading returns the current master modes. 25 Writing set the master mode 26 27What: /sys/bus/iio/devices/triggerX/sampling_frequency 28KernelVersion: 4.11 29Contact: benjamin.gaignard@st.com 30Description: 31 Reading returns the current sampling frequency. 32 Writing an value different of 0 set and start sampling. 33 Writing 0 stop sampling. 34 35What: /sys/bus/iio/devices/iio:deviceX/in_count0_preset 36KernelVersion: 4.12 37Contact: benjamin.gaignard@st.com 38Description: 39 Reading returns the current preset value. 40 Writing sets the preset value. 41 When counting up the counter starts from 0 and fires an 42 event when reach preset value. 43 When counting down the counter start from preset value 44 and fire event when reach 0. 45 46What: /sys/bus/iio/devices/iio:deviceX/in_count_quadrature_mode_available 47KernelVersion: 4.12 48Contact: benjamin.gaignard@st.com 49Description: 50 Reading returns the list possible quadrature modes. 51 52What: /sys/bus/iio/devices/iio:deviceX/in_count0_quadrature_mode 53KernelVersion: 4.12 54Contact: benjamin.gaignard@st.com 55Description: 56 Configure the device counter quadrature modes: 57 channel_A: 58 Encoder A input servers as the count input and B as 59 the UP/DOWN direction control input. 60 61 channel_B: 62 Encoder B input serves as the count input and A as 63 the UP/DOWN direction control input. 64 65 quadrature: 66 Encoder A and B inputs are mixed to get direction 67 and count with a scale of 0.25. 68