hd44780 driver: new ConnectionType ftdi (Thomas Jarosch)

2007-11-03 17:39:05 +00:00
parent 6af05c509a
commit 46347e8c94
10 changed files with 360 additions and 4 deletions
@@ -0,0 +1,158 @@
+/*
+ * FTDI/USB driver module for Hitachi HD44780 based LCD displays
+ * connected to a FT2232C/D chip in 8 bit mode.
+ *
+ * Copyright (c) 2007, Intra2net AG <opensource@intra2net.com>
+ *
+ * This file is released under the GNU General Public License. Refer to the
+ * COPYING file distributed with this package.
+ *
+ */
+
+#include "hd44780-ftdi.h"
+
+#include "report.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <usb.h>
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+#include <errno.h>
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+// initialize the driver
+int
+hd_init_ftdi(Driver *drvthis)
+{
+    int vendor_id, product_id;
+    int f;
+
+    PrivateData *p = (PrivateData*) drvthis->private_data;
+
+    p->hd44780_functions->senddata = ftdi_HD44780_senddata;
+    p->hd44780_functions->backlight = ftdi_HD44780_backlight;
+    p->hd44780_functions->scankeypad = ftdi_HD44780_scankeypad;
+    p->hd44780_functions->close = ftdi_HD44780_close;
+
+    // Load config
+    vendor_id = drvthis->config_get_int(drvthis->name, "VendorID", 0, 0x0403);
+    product_id = drvthis->config_get_int(drvthis->name, "ProductID", 0, 0x6001);
+
+    p->ftdi_line_RS = drvthis->config_get_int(drvthis->name, "ftdi_line_RS", 0, 0x01);
+    p->ftdi_line_RW = drvthis->config_get_int(drvthis->name, "ftdi_line_RW", 0, 0x02);
+    p->ftdi_line_E = drvthis->config_get_int(drvthis->name, "ftdi_line_E", 0, 0x04);
+    p->ftdi_line_backlight = drvthis->config_get_int(drvthis->name, "ftdi_line_backlight", 0, 0x08);
+
+    // Init 1. channel: data
+    ftdi_init(&p->ftdic);
+    ftdi_set_interface(&p->ftdic, INTERFACE_A);
+    f = ftdi_usb_open(&p->ftdic, vendor_id, product_id);
+    if(f < 0 && f != -5) {
+        report(RPT_ERR, "unable to open ftdi device: %d (%s)", f, ftdi_get_error_string(&p->ftdic));
+        return -1;
+    }
+    debug(RPT_DEBUG, "ftdi open succeeded(channel 1): %d", f);
+
+    debug(RPT_DEBUG, "enabling bitbang mode(channel 1)\n");
+    ftdi_enable_bitbang(&p->ftdic, 0xFF);
+
+    // Init 2. channel: control
+    ftdi_init(&p->ftdic2);
+    ftdi_set_interface(&p->ftdic2, INTERFACE_B);
+    f = ftdi_usb_open(&p->ftdic2, vendor_id, product_id);
+    if(f < 0 && f != -5) {
+        report(RPT_ERR, "unable to open second ftdi device: %d (%s)", f, ftdi_get_error_string(&p->ftdic2));
+        return -2;
+    }
+    debug(RPT_DEBUG, "ftdi open succeeded(channel 2): %d", f);
+
+    debug(RPT_DEBUG, "enabling bitbang mode (channel 2)");
+    ftdi_enable_bitbang(&p->ftdic2, 0xFF);
+
+    // FTDI bug: Sometimes first write gets lost on kernel 2.6, needs investigation.
+    ftdi_HD44780_senddata (p, 0, RS_INSTR, FUNCSET | IF_8BIT);
+    usleep (4100);
+
+    common_init(p, IF_8BIT);
+
+    return 0;
+}
+
+// ftdi_HD44780_senddata
+void
+ftdi_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch)
+{
+    // Output data on first channel
+    int f = ftdi_write_data(&p->ftdic, &ch, 1);
+    if (f < 0) {
+        p->hd44780_functions->drv_report(RPT_ERR, "failed to write: %d (%s). Exiting", f, ftdi_get_error_string(&p->ftdic));
+        exit (-1);
+    }
+
+    // Setup RS and R/W and E
+    ch = p->ftdi_line_E | p->backlight_bit;
+    if (flags == RS_DATA) {
+        ch |= p->ftdi_line_RS;
+    }
+    f = ftdi_write_data(&p->ftdic2, &ch, 1);
+    if (f < 0) {
+        p->hd44780_functions->drv_report(RPT_ERR, "failed to write: %d (%s). Exiting", f, ftdi_get_error_string(&p->ftdic2));
+        exit(-1);
+    }
+
+    // Disable E
+    ch = 0x00 | p->backlight_bit;
+    if (flags == RS_DATA) {
+        ch |= p->ftdi_line_RS;
+    }
+    f = ftdi_write_data(&p->ftdic2, &ch, 1);
+    if (f < 0) {
+        p->hd44780_functions->drv_report(RPT_ERR, "failed to write: %d (%s). Exiting", f, ftdi_get_error_string(&p->ftdic2));
+        exit(-1);
+    }
+}
+
+
+void
+ftdi_HD44780_backlight(PrivateData *p, unsigned char state)
+{
+    int f;
+
+    p->backlight_bit = state ? p->ftdi_line_backlight : 0;
+
+    f = ftdi_write_data(&p->ftdic2, &state, 1);
+    if (f < 0) {
+        p->hd44780_functions->drv_report(RPT_ERR, "failed to write: %d (%s). Exiting", f, ftdi_get_error_string(&p->ftdic2));
+        exit(-1);
+    }
+}
+
+
+unsigned char
+ftdi_HD44780_scankeypad(PrivateData *p)
+{
+    return 0;
+}
+
+
+void
+ftdi_HD44780_close(PrivateData *p)
+{
+    ftdi_disable_bitbang(&p->ftdic);
+    ftdi_usb_close(&p->ftdic);
+    ftdi_deinit(&p->ftdic);
+
+    ftdi_disable_bitbang(&p->ftdic2);
+    ftdi_usb_close(&p->ftdic2);
+    ftdi_deinit(&p->ftdic2);
+}
+
+/* EOF */