new ConnectionType lcd2usb in hd44780 driver

2007-03-31 12:43:27 +00:00
parent 9f70890432
commit 4839321569
12 changed files with 301 additions and 33 deletions
@@ -0,0 +1,160 @@
+/* driver module for Hitachi HD44780 based LCD displays
+ * connected to using the lcd2usb interface
+ * (http://www.harbaum.org/till/lcd2usb)
+ *
+ * Copyright (C) 2007 Peter Marschall <peter@adpm.de>
+ *
+ * This file is released under the GNU General Public License. Refer to the
+ * COPYING file distributed with this package.
+ */
+
+#include "hd44780-lcd2usb.h"
+
+#include "report.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <usb.h>
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+
+/* USB device handle & interface index we write to */
+static usb_dev_handle *lcd2usb;
+
+
+// initialize the driver
+int
+hd_init_lcd2usb (Driver *drvthis)
+{
+  PrivateData *p = (PrivateData*) drvthis->private_data;
+
+  struct usb_bus *bus;
+  //char device_manufacturer[LCD_MAX_WIDTH+1] = "";
+  int contrast = -1;	/* illegal contrast value (to detect errors) */
+  int brightness = -1;	/* illegal brightness value (to detect errors) */
+
+  p->hd44780_functions->senddata = lcd2usb_HD44780_senddata;
+  p->hd44780_functions->backlight = lcd2usb_HD44780_backlight;
+  p->hd44780_functions->scankeypad = lcd2usb_HD44780_scankeypad;
+  p->hd44780_functions->close = lcd2usb_HD44780_close;
+
+  /* Read config file's contents: contrast */
+
+  contrast = drvthis->config_get_int(drvthis->name, "Contrast", 0, DEFAULT_CONTRAST);
+  brightness = drvthis->config_get_int(drvthis->name, "Brightness", 0, DEFAULT_BRIGHTNESS);
+
+  /* try to find USB device */
+#if 0
+  usb_debug = 2;
+#endif
+
+  usb_init();
+  usb_find_busses();
+  usb_find_devices();
+
+  lcd2usb = NULL;
+  for (bus = usb_get_busses(); bus != NULL; bus = bus->next) {
+    struct usb_device *dev;
+
+    for (dev = bus->devices; dev != NULL; dev = dev->next) {
+
+      /* Check if this device is a LCD2USB device */
+      if ((dev->descriptor.idVendor == LCD2USB_VENDORID) &&
+	  (dev->descriptor.idProduct == LCD2USB_PRODUCTID)) {
+
+        /* LCD2USB device found; try to find its description */
+        lcd2usb = usb_open(dev);
+        if (lcd2usb == NULL) {
+          report(RPT_WARNING, "hd_init_lcd2usb: unable to open device");
+          // return -1;                /* it's better to continue */
+        }
+        else {
+          /* get device information & check for serial number */
+          //if (usb_get_string_simple(lcd2usb, dev->descriptor.iManufacturer,
+          //                          manufacturer, LCD_MAX_WIDTH) <= 0)
+          //  *manufacturer = '\0';
+          //manufacturer[sizeof(manufacturer)-1] = '\0';
+
+          //if (usb_get_string_simple(lcd2usb, dev->descriptor.iProduct,
+          //                          product, LCD_MAX_WIDTH) <= 0)
+          //  *product = '\0';
+          //product[sizeof(product)-1] = '\0';
+
+          //usb_close(lcd2usb);
+          //lcd2usb = NULL;
+        }
+      }
+    }
+  }
+
+  if (lcd2usb != NULL) {
+    debug(RPT_DEBUG, "hd_init_lcd2usb: opening device succeeded");
+
+  }
+  else {
+    report(RPT_ERR, "hd_init_lcd2usb: no (matching) LCD2USB device found");
+    return -1;
+  }
+
+  common_init(p, IF_4BIT);
+
+  /* set contrast */
+  if ((0 <= contrast) && (contrast <= 1000)) {
+    int res = usb_control_msg(lcd2usb, USB_TYPE_VENDOR, LCD2USB_SET_CONTRAST,
+                              (contrast * 255) / 1000, 0, NULL, 0, 1000);
+    if (res < 0)
+      report(RPT_WARNING, "hd_init_lcd2usb: setting contrast failed");
+  } else {
+    report(RPT_INFO, "hd_init_lcd2usb: Using default contrast value");
+  }
+
+  /* set brightness */
+  if ((0 <= brightness) && (brightness <= 1000)) {
+    int res = usb_control_msg(lcd2usb, USB_TYPE_VENDOR, LCD2USB_SET_BRIGHTNESS,
+                              (brightness * 255) / 1000, 0, NULL, 0, 1000);
+    if (res < 0)
+      report(RPT_WARNING, "hd_init_lcd2usb: setting brightness failed");
+  } else {
+    report(RPT_INFO, "hd_init_lcd2usb: Using default brightness value");
+  }
+
+  return 0;
+}
+
+
+// lcd2usb_HD44780_senddata
+void
+lcd2usb_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch)
+{
+int type = (flags == RS_DATA) ? (LCD2USB_DATA | LCD2USB_CTRL_0) : (LCD2USB_CMD | LCD2USB_CTRL_0);
+
+    usb_control_msg(lcd2usb, USB_TYPE_VENDOR, type, ch, 0, NULL, 0, 1000);
+}
+
+
+void
+lcd2usb_HD44780_backlight(PrivateData *p, unsigned char state)
+{
+}
+
+
+unsigned char
+lcd2usb_HD44780_scankeypad(PrivateData *p)
+{
+  return 0;
+}
+
+void
+lcd2usb_HD44780_close(PrivateData *p)
+{
+  if (lcd2usb != NULL) {
+    usb_close(lcd2usb);
+    lcd2usb = NULL;
+  }
+}
+
+/* EOF */