0001 What: /sys/bus/iio/devices/triggerX/master_mode_available
0002 KernelVersion: 4.11
0003 Contact: benjamin.gaignard@st.com
0004 Description:
0005 Reading returns the list possible master modes which are:
0006
0007
0008 - "reset"
0009 The UG bit from the TIMx_EGR register is
0010 used as trigger output (TRGO).
0011 - "enable"
0012 The Counter Enable signal CNT_EN is used
0013 as trigger output.
0014 - "update"
0015 The update event is selected as trigger output.
0016 For instance a master timer can then be used
0017 as a prescaler for a slave timer.
0018 - "compare_pulse"
0019 The trigger output send a positive pulse
0020 when the CC1IF flag is to be set.
0021 - "OC1REF"
0022 OC1REF signal is used as trigger output.
0023 - "OC2REF"
0024 OC2REF signal is used as trigger output.
0025 - "OC3REF"
0026 OC3REF signal is used as trigger output.
0027 - "OC4REF"
0028 OC4REF signal is used as trigger output.
0029
0030 Additional modes (on TRGO2 only):
0031
0032 - "OC5REF"
0033 OC5REF signal is used as trigger output.
0034 - "OC6REF"
0035 OC6REF signal is used as trigger output.
0036 - "compare_pulse_OC4REF":
0037 OC4REF rising or falling edges generate pulses.
0038 - "compare_pulse_OC6REF":
0039 OC6REF rising or falling edges generate pulses.
0040 - "compare_pulse_OC4REF_r_or_OC6REF_r":
0041 OC4REF or OC6REF rising edges generate pulses.
0042 - "compare_pulse_OC4REF_r_or_OC6REF_f":
0043 OC4REF rising or OC6REF falling edges generate
0044 pulses.
0045 - "compare_pulse_OC5REF_r_or_OC6REF_r":
0046 OC5REF or OC6REF rising edges generate pulses.
0047 - "compare_pulse_OC5REF_r_or_OC6REF_f":
0048 OC5REF rising or OC6REF falling edges generate
0049 pulses.
0050
0051 ::
0052
0053 +-----------+ +-------------+ +---------+
0054 | Prescaler +-> | Counter | +-> | Master | TRGO(2)
0055 +-----------+ +--+--------+-+ |-> | Control +-->
0056 | | || +---------+
0057 +--v--------+-+ OCxREF || +---------+
0058 | Chx compare +----------> | Output | ChX
0059 +-----------+-+ | | Control +-->
0060 . | | +---------+
0061 . | | .
0062 +-----------v-+ OC6REF | .
0063 | Ch6 compare +---------+>
0064 +-------------+
0065
0066 Example with: "compare_pulse_OC4REF_r_or_OC6REF_r"::
0067
0068 X
0069 X X
0070 X . . X
0071 X . . X
0072 X . . X
0073 count X . . . . X
0074 . . . .
0075 . . . .
0076 +---------------+
0077 OC4REF | . . |
0078 +-+ . . +-+
0079 . +---+ .
0080 OC6REF . | | .
0081 +-------+ +-------+
0082 +-+ +-+
0083 TRGO2 | | | |
0084 +-+ +---+ +---------+
0085
0086 What: /sys/bus/iio/devices/triggerX/master_mode
0087 KernelVersion: 4.11
0088 Contact: benjamin.gaignard@st.com
0089 Description:
0090 Reading returns the current master modes.
0091 Writing set the master mode
0092
0093 What: /sys/bus/iio/devices/iio:deviceX/in_count0_preset
0094 KernelVersion: 4.12
0095 Contact: benjamin.gaignard@st.com
0096 Description:
0097 Reading returns the current preset value.
0098 Writing sets the preset value.
0099 When counting up the counter starts from 0 and fires an
0100 event when reach preset value.
0101 When counting down the counter start from preset value
0102 and fire event when reach 0.
0103
0104 What: /sys/bus/iio/devices/iio:deviceX/in_count_enable_mode_available
0105 KernelVersion: 4.12
0106 Contact: benjamin.gaignard@st.com
0107 Description:
0108 Reading returns the list possible enable modes.
0109
0110 What: /sys/bus/iio/devices/iio:deviceX/in_count0_enable_mode
0111 KernelVersion: 4.12
0112 Contact: benjamin.gaignard@st.com
0113 Description:
0114 Configure the device counter enable modes, in all case
0115 counting direction is set by in_count0_count_direction
0116 attribute and the counter is clocked by the internal clock.
0117
0118 always:
0119 Counter is always ON.
0120
0121 gated:
0122 Counting is enabled when connected trigger signal
0123 level is high else counting is disabled.
0124
0125 triggered:
0126 Counting is enabled on rising edge of the connected
0127 trigger, and remains enabled for the duration of this
0128 selected mode.
0129
0130 What: /sys/bus/iio/devices/iio:deviceX/in_count_trigger_mode_available
0131 KernelVersion: 4.13
0132 Contact: benjamin.gaignard@st.com
0133 Description:
0134 Reading returns the list possible trigger modes.
0135
0136 What: /sys/bus/iio/devices/iio:deviceX/in_count0_trigger_mode
0137 KernelVersion: 4.13
0138 Contact: benjamin.gaignard@st.com
0139 Description:
0140 Configure the device counter trigger mode
0141 counting direction is set by in_count0_count_direction
0142 attribute and the counter is clocked by the connected trigger
0143 rising edges.
