mirror of
https://github.com/goodtft/LCD-show.git
synced 2024-12-03 23:24:16 +01:00
79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
#include <linux/input.h> // input_event
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#include <fcntl.h> // O_RDONLY, O_NONBLOCK
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#include <stdio.h> // printf
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#include <stdint.h> // uint64_t
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#include "config.h"
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#include "keyboard.h"
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#include "util.h"
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#include "tick.h"
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#if defined(BACKLIGHT_CONTROL_FROM_KEYBOARD) && defined(TURN_DISPLAY_OFF_AFTER_USECS_OF_INACTIVITY)
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#define READ_KEYBOARD_ENABLED
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#endif
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int key_fd = -1;
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void OpenKeyboard()
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{
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#ifdef READ_KEYBOARD_ENABLED
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key_fd = open(KEYBOARD_INPUT_FILE, O_RDONLY|O_NONBLOCK);
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if (key_fd < 0) printf("Warning: cannot open keyboard input file " KEYBOARD_INPUT_FILE "! Try double checking that it exists, or reconfigure it in keyboard.cpp, or remove line '#define BACKLIGHT_CONTROL_FROM_KEYBOARD' in config.h if you do not want keyboard activity to factor into backlight control.\n");
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#endif
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}
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int ReadKeyboard()
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{
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#ifdef READ_KEYBOARD_ENABLED
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if (key_fd < 0) return 0;
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struct input_event ev;
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ssize_t bytesRead = -1;
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int numRead = 0;
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do
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{
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bytesRead = read(key_fd, &ev, sizeof(struct input_event));
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if (bytesRead >= sizeof(struct input_event))
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{
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if (ev.type == 1 && ev.code != 0) // key up or down
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{
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// printf("time: %d %d type: %d, code: %d, value: %d\n", ev.time.tv_sec, ev.time.tv_usec, ev.type, ev.code, ev.value);
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++numRead;
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}
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}
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} while(bytesRead > 0);
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return numRead;
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#else
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return 0;
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#endif
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}
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void CloseKeyboard()
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{
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#ifdef READ_KEYBOARD_ENABLED
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if (key_fd >= 0)
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{
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close(key_fd);
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key_fd = -1;
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}
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#endif
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}
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static uint64_t lastKeyboardPressTime = 0;
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static uint64_t lastKeyboardPressCheckTime = 0;
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uint64_t TimeSinceLastKeyboardPress(void)
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{
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#ifdef READ_KEYBOARD_ENABLED
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uint64_t now = tick();
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if (now - lastKeyboardPressCheckTime >= 250000) // ReadKeyboard() takes about 8 usecs on Pi 3B, so 250msecs poll interval should be fine
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{
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lastKeyboardPressCheckTime = now;
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if (ReadKeyboard())
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lastKeyboardPressTime = now;
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}
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return now - lastKeyboardPressTime;
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#else
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return 0;
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#endif
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}
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