new ConnectionType ethlcd for hd44780 (Mariusz Bialonczyk)

2008-09-17 13:28:17 +00:00
parent 8c8e12364d
commit 0497178706
12 changed files with 240 additions and 1 deletions
@@ -0,0 +1,154 @@
+/** \file hd44780-ethlcd.c
+ * \c ethlcd connection type of \c hd44780 driver for Hitachi HD44780 based LCD displays.
+ */
+
+/*
+ * ethlcd ethernet driver module for Hitachi HD44780 based LCD displays
+ * ethlcd is an opensource project based on atmel's atmega microcontroller
+ * and enc28j60 ethernet device. The device is connected via ethernet, has own
+ * IP address and is available via TCP protocol. More info at project homepage:
+ * http://manio.skyboo.net/ethlcd/
+ *
+ * Copyright (c) 2008  Mariusz Bialonczyk <manio@skyboo.net>
+ *
+ * This file is released under the GNU General Public License. Refer to the
+ * COPYING file distributed with this package.
+ *
+ */
+
+#include "hd44780-ethlcd.h"
+#include "hd44780-low.h"
+#include "../../shared/sockets.h"
+#include "report.h"
+ 
+#include <stdio.h>
+#include <string.h>
+#include <bits/local_lim.h>
+#include <fcntl.h>
+
+
+void ethlcd_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch);
+unsigned char ethlcd_HD44780_scankeypad(PrivateData *p);
+void ethlcd_HD44780_backlight(PrivateData *p, unsigned char state);
+void ethlcd_HD44780_close(PrivateData *p);
+// fake pause function (pausing is handled by ethlcd device itself)
+void ethlcd_HD44780_uPause(PrivateData *p, int usecs) {}
+
+
+// initialisation function
+int hd_init_ethlcd(Driver *drvthis)
+{
+	char hostname[HOST_NAME_MAX];
+	long flags;
+
+	PrivateData *p = (PrivateData*) drvthis->private_data;
+	HD44780_functions *hd44780_functions = p->hd44780_functions;
+
+	hd44780_functions->senddata = ethlcd_HD44780_senddata;
+	hd44780_functions->backlight = ethlcd_HD44780_backlight;
+	hd44780_functions->scankeypad = ethlcd_HD44780_scankeypad;
+	hd44780_functions->uPause = ethlcd_HD44780_uPause;
+	hd44780_functions->close = ethlcd_HD44780_close;
+
+	//reading configuration file
+	strncpy(hostname, drvthis->config_get_string(drvthis->name, "Device", 0, "ethlcd"), sizeof(hostname));
+
+	p->sock = sock_connect(hostname, DEFAULT_ETHLCD_PORT);
+	if (p->sock < 0) {
+		report(RPT_ERR, "Connecting to %s:%d failed", hostname, DEFAULT_ETHLCD_PORT);
+		return -1;
+	}
+
+	//we need to have a blocking read back again:
+	if (fcntl(p->sock, F_GETFL, &flags) < 0)
+	{
+		report(RPT_ERR, "Cannot set the socket to blocking mode");
+		return -1;
+	}
+	flags &= ~O_NONBLOCK;
+	fcntl(p->sock, F_SETFL, flags);
+
+	// Set up two-line, small character (5x8) mode
+	hd44780_functions->senddata(p, 0, RS_INSTR, FUNCSET | IF_4BIT | TWOLINE | SMALLCHAR);
+
+	common_init(p, IF_4BIT);
+
+	if (p->have_keypad) {
+		// Remember which input lines are stuck
+		p->stuckinputs = 0;
+	}
+
+	return 0;
+}
+
+
+// ethlcd_HD44780_senddata
+void ethlcd_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch)
+{
+	static char buff[2];
+
+	if (flags == RS_INSTR)
+		buff[0] = ETHLCD_SEND_INSTR;
+	else //if (flags == RS_DATA)
+		buff[0] = ETHLCD_SEND_DATA;
+	buff[1] = ch;
+
+	sock_send(p->sock, buff, 2);	//send data to device
+	sock_recv(p->sock, &buff, 1);	//wait for reply
+}
+
+
+unsigned char ethlcd_HD44780_scankeypad(PrivateData *p)
+{
+	unsigned char readval;
+	static char buff[2];
+
+	buff[0] = ETHLCD_GET_BUTTONS;
+
+	sock_send(p->sock, buff, 1);	//send data to device
+	sock_recv(p->sock, &buff, 2);	//wait for answer
+
+	if (buff[0] != ETHLCD_GET_BUTTONS)  //check if this is true reply for our packet
+		return 0;
+	//answer should be in second byte on bits 0-6 in negative logic:
+	readval = buff[1];
+
+	readval = ~readval & 0x3F;	//reverse logic
+	switch (readval)
+	{
+		case 1:  return(0x34);	//C
+		case 2:  return(0x24);	//B
+		case 4:  return(0x14);	//A
+		case 8:  return(0x25);  //F
+		case 16: return(0x15);	//E
+		case 32: return(0x44);	//D
+		default: return('\0');
+	}
+}
+
+
+void ethlcd_HD44780_backlight(PrivateData *p, unsigned char state)
+{
+	static char buff[2];
+
+	buff[0] = ETHLCD_SET_BACKLIGHT;
+
+	if (state == BACKLIGHT_ON)
+	{
+		if (p->brightness >= 500)
+			buff[1] = ETHLCD_BACKLIGHT_ON;
+		else
+			buff[1] = ETHLCD_BACKLIGHT_HALF;
+	}
+	else
+		buff[1] = ETHLCD_BACKLIGHT_OFF;
+
+	sock_send(p->sock, buff, 2);	//send data to device
+	sock_recv(p->sock, &buff, 1);	//wait for reply
+}
+
+
+void ethlcd_HD44780_close(PrivateData *p)
+{
+	sock_close(p->sock);
+}