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author | Romain Porte <microjoe@microjoe.org> | 2020-02-08 14:28:16 +0100 |
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committer | Romain Porte <microjoe@microjoe.org> | 2020-02-08 14:28:16 +0100 |
commit | 5b4b95fc25d92615fe2555cac0d53c425e5201b0 (patch) | |
tree | f17c74b1187d03edc8a030200ce107f5321f997e /src/lib.rs | |
parent | 7be6f770263b4a3bbaab32ab4aa7d88ca43089fa (diff) | |
download | charlcd-5b4b95fc25d92615fe2555cac0d53c425e5201b0.tar.gz charlcd-5b4b95fc25d92615fe2555cac0d53c425e5201b0.zip |
add width and height support (hack)
Diffstat (limited to 'src/lib.rs')
-rw-r--r-- | src/lib.rs | 27 |
1 files changed, 27 insertions, 0 deletions
@@ -1,4 +1,5 @@ mod codes; +mod of_node; use std::fs::{File, OpenOptions}; use std::path::Path; @@ -198,4 +199,30 @@ impl FileScreen { pub fn default() -> std::io::Result<FileScreen> { Screen::from_dev_path(&Path::new(DEFAULT_SCREEN_DEV_PATH)) } + + /// Get the width of the screen, in number of characters it can display. + /// + /// **Important note:** The implementation behind this function is + /// currently a hack that will go find the value in the `auxdisplay` + /// platform device tree node in + /// `/sys/devices/platform/auxdisplay/of_node/*`. This is because the + /// `charlcd` driver does not export the screen width nor height to + /// userspace (could be using `ioctl` or `read` syscalls). + /// + pub fn width(&self) -> std::io::Result<u32> { + of_node::display_width_chars() + } + + /// Get the height of the screen, in number of characters it can display. + /// + /// **Important note:** The implementation behind this function is + /// currently a hack that will go find the value in the `auxdisplay` + /// platform device tree node in + /// `/sys/devices/platform/auxdisplay/of_node/*`. This is because the + /// `charlcd` driver does not export the screen width nor height to + /// userspace (could be using `ioctl` or `read` syscalls). + /// + pub fn height(&self) -> std::io::Result<u32> { + of_node::display_height_chars() + } } |