diff options
Diffstat (limited to 'Documentation/ABI/testing/sysfs-bus-iio-timer-stm32')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 | 71 |
1 files changed, 67 insertions, 4 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 index 6534a60037ff..230020e06677 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 +++ b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 @@ -3,11 +3,15 @@ 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. + - "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. + 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. @@ -27,3 +31,62 @@ 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. |