[新增] 华清 源码

examples/ex3/test.c

@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <linux/input.h>
+
+
+#define KEY_DEV_PATH "/dev/input/event0"
+
+int fs4412_get_key(void)
+{
+	int fd; 
+	struct input_event event;
+
+	fd = open(KEY_DEV_PATH, O_RDONLY);
+	if(fd == -1) {
+		perror("fskey->open");
+		return -1;
+	}
+
+	while (1) {
+		if(read(fd, &event, sizeof(event)) == sizeof(event)) {
+			if (event.type == EV_KEY && event.value == 1) {
+				close(fd);
+				return event.code;
+			} else
+				continue;
+		} else {
+			close(fd);
+			fprintf(stderr, "fskey->read: read failed\n");
+			return -1;
+		}
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	while (1)
+		printf("key value: %d\n", fs4412_get_key());
+}