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Simplify and clean up joystick example

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Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson
2016-03-13 22:36:46 +01:00
parent d5d6f9d844
commit 71697266ed
2 changed files with 31 additions and 33 deletions
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README.md
+5 -5
View File
@@ -246,8 +246,7 @@ to act upon joystick input.
switch (e.type) {
case 1:
if (e.value) printf("Button %d pressed\n", e.number);
else printf("Button %d released\n", e.number);
printf("Button %d %s\n", e.number, e.value ? "pressed" : "released");
break;
case 2:
@@ -258,15 +257,16 @@ to act upon joystick input.
int main(void)
{
int fd = open("/dev/input/js1", O_RDONLY, O_NONBLOCK);
uev_t js1_watcher;
int fd;
uev_t watcher;
uev_ctx_t ctx;
fd = open("/dev/input/js1", O_RDONLY, O_NONBLOCK);
if (fd < 0)
errx(errno, "Cannot find a joystick attached.");
uev_init(&ctx);
uev_io_init(&ctx, &js1_watcher, joystick_cb, NULL, fd, UEV_READ);
uev_io_init(&ctx, &watcher, joystick_cb, NULL, fd, UEV_READ);
puts("Starting, press Ctrl-C to exit.");
examples/joystick.c
+6 -8
View File
@@ -1,6 +1,6 @@
/* Simple example of how to use libuEv with Linux joystick API
*
* Copyright (c) 2014-2015 Joachim Nilsson <troglobit()gmail!com>
* Copyright (c) 2014-2016 Joachim Nilsson <troglobit()gmail!com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@@ -30,8 +30,6 @@
#include "uev.h"
#define UNUSED(arg) arg __attribute__ ((unused))
struct js_event {
uint32_t time; /* event timestamp in milliseconds */
int16_t value; /* value */
@@ -39,15 +37,14 @@ struct js_event {
uint8_t number; /* axis/button number */
} e;
static void joystick_cb(uev_t *w, void *UNUSED(arg), int UNUSED(events))
static void joystick_cb(uev_t *w, void *arg, int events)
{
if (read(w->fd, &e, sizeof(e)) < 0)
errx(errno, "Failed reading joystick event");
switch (e.type) {
case 1:
if (e.value) printf("Button %d pressed\n", e.number);
else printf("Button %d released\n", e.number);
printf("Button %d %s\n", e.number, e.value ? "pressed" : "released");
break;
case 2:
@@ -58,10 +55,11 @@ static void joystick_cb(uev_t *w, void *UNUSED(arg), int UNUSED(events))
int main(void)
{
int fd = open("/dev/input/js1", O_RDONLY, O_NONBLOCK);
int fd;
uev_t js1_watcher;
uev_ctx_t ctx;
fd = open("/dev/input/js1", O_RDONLY, O_NONBLOCK);
if (fd < 0)
errx(errno, "Cannot find a joystick attached.");
@@ -75,7 +73,7 @@ int main(void)
/**
* Local Variables:
* compile-command: "gcc -o joystick joystick.c io.o timer.o signal.o main.o"
* compile-command: "make joystick"
* version-control: t
* indent-tabs-mode: t
* c-file-style: "linux"