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tagtagtag-ears
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Linux driver for tagtagtag ears
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tagtagtag-ears
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# tagtagtag-ears Linux driver for tagtagtag ears Creates `/dev/ear0` (left) and `/dev/ear1` (right) to drive tagtagtag ears. ## Installation make sudo make install This adds: dtoverlay=tagtagtag-ears to /boot/config.txt reboot ## Usage A single process can open `/dev/ear0` (resp. `/dev/ear1`). Any further access will fail with `EBUSY`. The following commands are accepted: - `'.'` NOP - `'+' <count>` Move ear <count> steps forwards (count from 0 to 255) Example: echo -n -e '+\x03' > /dev/ear0 will move the ear 3 steps forward - `'-' <count>` Move ear <count> steps backwards (count from 0 to 255) Example: echo -n -e '-\x03' > /dev/ear0 will move the ear 3 steps backward - `'>' <position>` Move ear forward until <position> % 17 is reached. If position > 17, perform additional turns. If position is unknown, perform a detection running forward. Example: echo -n -e '>\x03' > /dev/ear0 will move the ear forward to position "3" (3 steps after missing hole). - `'<' <position>` Move ear backward until <position> % 17 is reached. If position > 17, perform additional turns. If position is unknown, perform a detection running backward. Example: echo -n -e '<\x03' > /dev/ear0 will move the ear forward to position "3" (3 steps after missing hole). - `'?'` Get position or -1 if unknown (to be read from device) Example: echo -n -e '>\x03?' > /dev/ear0 && dd if=/dev/ear0 of=/dev/stdout count=1 bs=1 will output '\x03' after ear has been moved to position 3. - `'!'` Get position, running a position detection if required. ## Detecting user moves and blocking I/O Detecting user moves is achieved by reading `/dev/ear*`. Read blocks until ear is moved (it will then return 'm') or a get position command is invoked. Once a 'm' is read, it will block until an additional movement occurs. Any command clears the buffer. Writing will block if the ear is not idle. Most command will set the ear in a non-idle state, thus '.' can be used to block until the command ends. Compare: echo -n -e '+\x0A' > /dev/ear0 with: echo -n -e '+\x0A.' > /dev/ear0 The first line returns immediatly. The second line blocks until the ear moved the requested steps. ## Broken ears Ears are tested on start-up (ears perform a full turn which is also used to determine ear position). If, at any time, no rising GPIO interrupt is received within 3 seconds, the ear is considered broken. Any further write will fail. Reading will return EOF.
