In our appliance, we need some way to access the buttons near our lcd
display. Luckily, we found that in drv_HD_LCM162_timer, there is already
some checking done fore keypresses. So all I needed to to was to call a
function which sends some udp packages. Obviously, this only works on
LCM162 devices. Oh well...
The patch I use for that is included below. There are some unresolved
problems with it:
- the portnumber (and perhaps the hostname) should be configurable
- the format string could be configurable
- documentation is lacking
what do you think about this patch? perhaps it could be integrated
better with the GPIO or some other driver, but I don't understand the
code enough.
As said, we needed a simple solution for accessing the buttons on our
LCM162 display. would be great if this patch could be merged in a more
generic form...
=== modified file 'drv_HD44780.c'
--- drv_HD44780.c 2006-08-10 20:40:46 +0000
+++ drv_HD44780.c 2006-10-02 12:34:14 +0000
@@ -316,6 +316,13 @@
#include "drv_generic_i2c.h"
#endif
+
+/* extra includes for sending udp */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+
static char Name[] = "HD44780";
static int Bus;
@@ -1197,6 +1204,42 @@
}
+static void send_keypress_via_udp(int keynum, int updown) {
+ int sock;
+ struct sockaddr_in name;
+ struct hostent *hostinfo;
+ char *msg[16];
+
+ /* Create the socket. */
+ sock = socket (PF_INET, SOCK_DGRAM, 0);
+ if (sock < 0) {
+ debug("fail to setup sockent: %m");
+ return;
+ }
+
+ name.sin_family = AF_INET;
+ name.sin_port = htons (11223);
+ name.sin_addr.s_addr = htonl(INADDR_ANY);
+ hostinfo = gethostbyname("localhost");
+
+ if (hostinfo == NULL) {
+ debug ("gethostbyname on localhost failed. WTF?!");
+ return;
+ }
+
+ snprintf((char *)msg, 16, "key %d state %d\n", keynum, updown);
+
+ name.sin_addr = *(struct in_addr *) hostinfo->h_addr;
+ sendto(sock, msg, 16, 0,
+ (struct sockaddr *) &name, sizeof name);
+
+ close(sock);
+
+ return;
+}
+
+
+
static void drv_HD_LCM162_timer(void __attribute__ ((unused)) * notused)
{
static unsigned char data = 0x00;
@@ -1222,10 +1265,10 @@
updown = (data & mask6 ? 1 : 0);
debug("key %d press %d", keynum, updown);
+ send_keypress_via_udp(keynum, updown);
}
}
-
static int drv_HD_start(const char *section, const int quiet)
{
char *model, *size, *bus;
--
Gruesse/greetings,
Reinhard Tartler, KeyID 945348A4
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