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Add validate function to be use to use the correct trigger. Add an attribute to configure device mode like for quadrature and enable modes Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
155 lines
5.4 KiB
Text
155 lines
5.4 KiB
Text
What: /sys/bus/iio/devices/triggerX/master_mode_available
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KernelVersion: 4.11
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Contact: benjamin.gaignard@st.com
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Description:
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Reading returns the list possible master modes which are:
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- "reset" : The UG bit from the TIMx_EGR register is
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used as trigger output (TRGO).
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- "enable" : The Counter Enable signal CNT_EN is used
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as trigger output.
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- "update" : The update event is selected as trigger output.
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For instance a master timer can then be used
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as a prescaler for a slave timer.
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- "compare_pulse" : The trigger output send a positive pulse
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when the CC1IF flag is to be set.
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- "OC1REF" : OC1REF signal is used as trigger output.
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- "OC2REF" : OC2REF signal is used as trigger output.
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- "OC3REF" : OC3REF signal is used as trigger output.
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- "OC4REF" : OC4REF signal is used as trigger output.
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Additional modes (on TRGO2 only):
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- "OC5REF" : OC5REF signal is used as trigger output.
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- "OC6REF" : OC6REF signal is used as trigger output.
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- "compare_pulse_OC4REF":
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OC4REF rising or falling edges generate pulses.
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- "compare_pulse_OC6REF":
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OC6REF rising or falling edges generate pulses.
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- "compare_pulse_OC4REF_r_or_OC6REF_r":
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OC4REF or OC6REF rising edges generate pulses.
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- "compare_pulse_OC4REF_r_or_OC6REF_f":
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OC4REF rising or OC6REF falling edges generate pulses.
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- "compare_pulse_OC5REF_r_or_OC6REF_r":
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OC5REF or OC6REF rising edges generate pulses.
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- "compare_pulse_OC5REF_r_or_OC6REF_f":
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OC5REF rising or OC6REF falling edges generate pulses.
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+-----------+ +-------------+ +---------+
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| Prescaler +-> | Counter | +-> | Master | TRGO(2)
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+-----------+ +--+--------+-+ |-> | Control +-->
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| | || +---------+
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+--v--------+-+ OCxREF || +---------+
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| Chx compare +----------> | Output | ChX
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+-----------+-+ | | Control +-->
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. | | +---------+
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. | | .
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+-----------v-+ OC6REF | .
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| Ch6 compare +---------+>
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+-------------+
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Example with: "compare_pulse_OC4REF_r_or_OC6REF_r":
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X
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X X
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X . . X
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X . . X
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X . . X
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count X . . . . X
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. . . .
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. . . .
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+---------------+
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OC4REF | . . |
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+-+ . . +-+
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. +---+ .
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OC6REF . | | .
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+-------+ +-------+
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+-+ +-+
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TRGO2 | | | |
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+-+ +---+ +---------+
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What: /sys/bus/iio/devices/triggerX/master_mode
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KernelVersion: 4.11
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Contact: benjamin.gaignard@st.com
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Description:
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Reading returns the current master modes.
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Writing set the master mode
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What: /sys/bus/iio/devices/triggerX/sampling_frequency
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KernelVersion: 4.11
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Contact: benjamin.gaignard@st.com
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Description:
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Reading returns the current sampling frequency.
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Writing an value different of 0 set and start sampling.
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Writing 0 stop sampling.
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What: /sys/bus/iio/devices/iio:deviceX/in_count0_preset
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KernelVersion: 4.12
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Contact: benjamin.gaignard@st.com
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Description:
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Reading returns the current preset value.
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Writing sets the preset value.
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When counting up the counter starts from 0 and fires an
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event when reach preset value.
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When counting down the counter start from preset value
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and fire event when reach 0.
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What: /sys/bus/iio/devices/iio:deviceX/in_count_quadrature_mode_available
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KernelVersion: 4.12
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Contact: benjamin.gaignard@st.com
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Description:
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Reading returns the list possible quadrature modes.
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What: /sys/bus/iio/devices/iio:deviceX/in_count0_quadrature_mode
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KernelVersion: 4.12
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Contact: benjamin.gaignard@st.com
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Description:
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Configure the device counter quadrature modes:
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channel_A:
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Encoder A input servers as the count input and B as
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the UP/DOWN direction control input.
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channel_B:
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Encoder B input serves as the count input and A as
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the UP/DOWN direction control input.
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quadrature:
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Encoder A and B inputs are mixed to get direction
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and count with a scale of 0.25.
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What: /sys/bus/iio/devices/iio:deviceX/in_count_enable_mode_available
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KernelVersion: 4.12
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Contact: benjamin.gaignard@st.com
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Description:
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Reading returns the list possible enable modes.
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What: /sys/bus/iio/devices/iio:deviceX/in_count0_enable_mode
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KernelVersion: 4.12
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Contact: benjamin.gaignard@st.com
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Description:
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Configure the device counter enable modes, in all case
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counting direction is set by in_count0_count_direction
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attribute and the counter is clocked by the internal clock.
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always:
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Counter is always ON.
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gated:
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Counting is enabled when connected trigger signal
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level is high else counting is disabled.
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triggered:
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Counting is enabled on rising edge of the connected
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trigger, and remains enabled for the duration of this
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selected mode.
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What: /sys/bus/iio/devices/iio:deviceX/in_count_trigger_mode_available
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KernelVersion: 4.13
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Contact: benjamin.gaignard@st.com
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Description:
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Reading returns the list possible trigger modes.
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What: /sys/bus/iio/devices/iio:deviceX/in_count0_trigger_mode
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KernelVersion: 4.13
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Contact: benjamin.gaignard@st.com
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Description:
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Configure the device counter trigger mode
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counting direction is set by in_count0_count_direction
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attribute and the counter is clocked by the connected trigger
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rising edges.
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