| What: /sys/bus/iio/devices/triggerX/master_mode_available |
| KernelVersion: 4.11 |
| Contact: benjamin.gaignard@st.com |
| Description: |
| Reading returns the list possible master modes which are: |
| - "reset" : The UG bit from the TIMx_EGR register is |
| used as trigger output (TRGO). |
| - "enable" : The Counter Enable signal CNT_EN is used |
| as trigger output. |
| - "update" : The update event is selected as trigger output. |
| For instance a master timer can then be used |
| as a prescaler for a slave timer. |
| - "compare_pulse" : The trigger output send a positive pulse |
| when the CC1IF flag is to be set. |
| - "OC1REF" : OC1REF signal is used as trigger output. |
| - "OC2REF" : OC2REF signal is used as trigger output. |
| - "OC3REF" : OC3REF signal is used as trigger output. |
| - "OC4REF" : OC4REF signal is used as trigger output. |
| Additional modes (on TRGO2 only): |
| - "OC5REF" : OC5REF signal is used as trigger output. |
| - "OC6REF" : OC6REF signal is used as trigger output. |
| - "compare_pulse_OC4REF": |
| OC4REF rising or falling edges generate pulses. |
| - "compare_pulse_OC6REF": |
| OC6REF rising or falling edges generate pulses. |
| - "compare_pulse_OC4REF_r_or_OC6REF_r": |
| OC4REF or OC6REF rising edges generate pulses. |
| - "compare_pulse_OC4REF_r_or_OC6REF_f": |
| OC4REF rising or OC6REF falling edges generate pulses. |
| - "compare_pulse_OC5REF_r_or_OC6REF_r": |
| OC5REF or OC6REF rising edges generate pulses. |
| - "compare_pulse_OC5REF_r_or_OC6REF_f": |
| OC5REF rising or OC6REF falling edges generate pulses. |
| |
| +-----------+ +-------------+ +---------+ |
| | Prescaler +-> | Counter | +-> | Master | TRGO(2) |
| +-----------+ +--+--------+-+ |-> | Control +--> |
| | | || +---------+ |
| +--v--------+-+ OCxREF || +---------+ |
| | Chx compare +----------> | Output | ChX |
| +-----------+-+ | | Control +--> |
| . | | +---------+ |
| . | | . |
| +-----------v-+ OC6REF | . |
| | Ch6 compare +---------+> |
| +-------------+ |
| |
| Example with: "compare_pulse_OC4REF_r_or_OC6REF_r": |
| |
| X |
| X X |
| X . . X |
| X . . X |
| X . . X |
| count X . . . . X |
| . . . . |
| . . . . |
| +---------------+ |
| OC4REF | . . | |
| +-+ . . +-+ |
| . +---+ . |
| OC6REF . | | . |
| +-------+ +-------+ |
| +-+ +-+ |
| TRGO2 | | | | |
| +-+ +---+ +---------+ |
| |
| What: /sys/bus/iio/devices/triggerX/master_mode |
| KernelVersion: 4.11 |
| Contact: benjamin.gaignard@st.com |
| Description: |
| Reading returns the current master modes. |
| Writing set the master mode |
| |
| What: /sys/bus/iio/devices/triggerX/sampling_frequency |
| KernelVersion: 4.11 |
| Contact: benjamin.gaignard@st.com |
| Description: |
| Reading returns the current sampling frequency. |
| Writing an value different of 0 set and start sampling. |
| Writing 0 stop sampling. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_count0_preset |
| KernelVersion: 4.12 |
| Contact: benjamin.gaignard@st.com |
| Description: |
| Reading returns the current preset value. |
| Writing sets the preset value. |
| When counting up the counter starts from 0 and fires an |
| event when reach preset value. |
| When counting down the counter start from preset value |
| and fire event when reach 0. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_count_quadrature_mode_available |
| KernelVersion: 4.12 |
| Contact: benjamin.gaignard@st.com |
| Description: |
| Reading returns the list possible quadrature modes. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_count0_quadrature_mode |
| KernelVersion: 4.12 |
| Contact: benjamin.gaignard@st.com |
| Description: |
| Configure the device counter quadrature modes: |
| channel_A: |
| Encoder A input servers as the count input and B as |
| the UP/DOWN direction control input. |
| |
| channel_B: |
| Encoder B input serves as the count input and A as |
| the UP/DOWN direction control input. |
| |
| quadrature: |
| Encoder A and B inputs are mixed to get direction |
| and count with a scale of 0.25. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_count_enable_mode_available |
| KernelVersion: 4.12 |
| Contact: benjamin.gaignard@st.com |
| Description: |
| Reading returns the list possible enable modes. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_count0_enable_mode |
| KernelVersion: 4.12 |
| Contact: benjamin.gaignard@st.com |
| Description: |
| Configure the device counter enable modes, in all case |
| counting direction is set by in_count0_count_direction |
| attribute and the counter is clocked by the internal clock. |
| always: |
| Counter is always ON. |
| |
| gated: |
| Counting is enabled when connected trigger signal |
| level is high else counting is disabled. |
| |
| triggered: |
| Counting is enabled on rising edge of the connected |
| trigger, and remains enabled for the duration of this |
| selected mode. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_count_trigger_mode_available |
| KernelVersion: 4.13 |
| Contact: benjamin.gaignard@st.com |
| Description: |
| Reading returns the list possible trigger modes. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_count0_trigger_mode |
| KernelVersion: 4.13 |
| Contact: benjamin.gaignard@st.com |
| Description: |
| Configure the device counter trigger mode |
| counting direction is set by in_count0_count_direction |
| attribute and the counter is clocked by the connected trigger |
| rising edges. |