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Linus Torvalds
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trunk/Documentation/ABI/testing/sysfs-bus-i2c-devices-hm6352
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Where: /sys/bus/i2c/devices/.../heading0_input | ||
Date: April 2010 | ||
Kernel Version: 2.6.36? | ||
Contact: alan.cox@intel.com | ||
Description: Reports the current heading from the compass as a floating | ||
point value in degrees. | ||
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Where: /sys/bus/i2c/devices/.../power_state | ||
Date: April 2010 | ||
Kernel Version: 2.6.36? | ||
Contact: alan.cox@intel.com | ||
Description: Sets the power state of the device. 0 sets the device into | ||
sleep mode, 1 wakes it up. | ||
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Where: /sys/bus/i2c/devices/.../calibration | ||
Date: April 2010 | ||
Kernel Version: 2.6.36? | ||
Contact: alan.cox@intel.com | ||
Description: Sets the calibration on or off (1 = on, 0 = off). See the | ||
chip data sheet. | ||
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What: /sys/bus/i2c/devices/<busnum>-<devaddr>/pressure0_input | ||
Date: June 2010 | ||
Contact: Christoph Mair <christoph.mair@gmail.com> | ||
Description: Start a pressure measurement and read the result. Values | ||
represent the ambient air pressure in pascal (0.01 millibar). | ||
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Reading: returns the current air pressure. | ||
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What: /sys/bus/i2c/devices/<busnum>-<devaddr>/temp0_input | ||
Date: June 2010 | ||
Contact: Christoph Mair <christoph.mair@gmail.com> | ||
Description: Measure the ambient temperature. The returned value represents | ||
the ambient temperature in units of 0.1 degree celsius. | ||
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Reading: returns the current temperature. | ||
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What: /sys/bus/i2c/devices/<busnum>-<devaddr>/oversampling | ||
Date: June 2010 | ||
Contact: Christoph Mair <christoph.mair@gmail.com> | ||
Description: Tell the bmp085 to use more samples to calculate a pressure | ||
value. When writing to this file the chip will use 2^x samples | ||
to calculate the next pressure value with x being the value | ||
written. Using this feature will decrease RMS noise and | ||
increase the measurement time. | ||
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Reading: returns the current oversampling setting. | ||
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Writing: sets a new oversampling setting. | ||
Accepted values: 0..3. |
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00-INDEX | ||
- This file | ||
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cachefeatures.txt | ||
- Supported cache features. | ||
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Filesystems | ||
- Requirements for mounting the root file system. | ||
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bfin-gpio-note.txt | ||
bfin-gpio-notes.txt | ||
- Notes in developing/using bfin-gpio driver. | ||
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bfin-spi-notes.txt | ||
- Notes for using bfin spi bus driver. |
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SPI Chip Select behavior: | ||
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With the Blackfin on-chip SPI peripheral, there is some logic tied to the CPHA | ||
bit whether the Slave Select Line is controlled by hardware (CPHA=0) or | ||
controlled by software (CPHA=1). However, the Linux SPI bus driver assumes that | ||
the Slave Select is always under software control and being asserted during | ||
the entire SPI transfer. - And not just bits_per_word duration. | ||
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In most cases you can utilize SPI MODE_3 instead of MODE_0 to work-around this | ||
behavior. If your SPI slave device in question requires SPI MODE_0 or MODE_2 | ||
timing, you can utilize the GPIO controlled SPI Slave Select option instead. | ||
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You can even use the same pin whose peripheral role is a SSEL, | ||
but use it as a GPIO instead. |
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