mmdolze
c9c3272eba
* Do not include system headers in shared files (stdlib.h). * Don't include lcd.h only once in each driver. * Remove some unnecessary headers from driver (e.g. syslog.h) * Include <poll.h> instead of <sys/poll.h> * Spelling fixes.
139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/** \file server/drivers/hd44780-usbtiny.c
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* \c USBtiny connection type of \c hd44780 driver for Hitachi HD44780 based LCD displays.
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*
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* http://www.xs4all.nl/~dicks/avr/usbtiny/
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*/
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/*-
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* Copyright (C) 2007 Peter Marschall <peter@adpm.de>
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* 2010 Siarhei Herasimchuk <sergby@tut.by>
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*
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* This file is released under the GNU General Public License.
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* Refer to the COPYING file distributed with this package.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include "hd44780-usbtiny.h"
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#include "hd44780-low.h"
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#include "report.h"
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/* connection type specific functions to be exposed using pointers in init() */
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void usbtiny_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch);
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void usbtiny_HD44780_close(PrivateData *p);
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/**
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* Pseudo (empty) uPause function.
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* Override the uPause function as a usbtiny device takes care of timing itself.
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* \param p Pointer to PrivateData structure (unused)
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* \param usecs Number of micro-seconds to sleep (ignored)
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*/
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void
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usbtiny_HD44780_uPause(PrivateData *p, int usecs)
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{
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}
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/**
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* Initialize the driver.
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* \param drvthis Pointer to driver structure.
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* \retval 0 Success.
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* \retval -1 Error.
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*/
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int
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hd_init_usbtiny(Driver *drvthis)
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{
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PrivateData *p = (PrivateData *) drvthis->private_data;
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struct usb_bus *bus;
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p->hd44780_functions->senddata = usbtiny_HD44780_senddata;
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p->hd44780_functions->close = usbtiny_HD44780_close;
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/* try to find USB device */
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usb_init();
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usb_find_busses();
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usb_find_devices();
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p->usbHandle = NULL;
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for (bus = usb_get_busses(); bus != NULL; bus = bus->next) {
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struct usb_device *dev;
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for (dev = bus->devices; dev != NULL; dev = dev->next) {
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/* Check if this device is a usbtiny device */
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if ((dev->descriptor.idVendor == USBTINY_VENDORID) &&
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(dev->descriptor.idProduct == USBTINY_PRODUCTID)) {
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/* USBtiny device found; try to open it */
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p->usbHandle = usb_open(dev);
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if (p->usbHandle == NULL) {
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report(RPT_WARNING, "hd_init_usbtiny: unable to open device");
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/*
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* Do not exit here because other
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* (possibly working) devices may be
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* connected.
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*/
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}
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else {
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report(RPT_INFO, "hd_init_usbtiny: USBtiny device found");
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}
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}
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}
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}
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/* No device found at all */
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if (p->usbHandle == NULL) {
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report(RPT_ERR, "hd_init_usbtiny: no (matching) USBtiny device found");
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return -1;
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}
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common_init(p, IF_4BIT);
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/* replace uPause with empty one after initialization */
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p->hd44780_functions->uPause = usbtiny_HD44780_uPause;
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return 0;
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}
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/**
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* Send data or commands to the display.
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* \param p Pointer to driver's private data structure.
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* \param displayID ID of the display (or 0 for all) to send data to.
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* \param flags Defines whether to end a command or data.
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* \param ch The value to send.
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*/
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void
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usbtiny_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch)
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{
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int type = (flags == RS_DATA) ? USBTINY_DATA : USBTINY_INSTR;
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char buffer[1];
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buffer[0] = (char) ch;
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usb_control_msg(p->usbHandle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_OUT, type, 0, 0, buffer, 1, 1000);
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}
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/**
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* Close the driver (do necessary clean-up).
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* \param p Pointer to driver's private data structure.
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*/
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void
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usbtiny_HD44780_close(PrivateData *p)
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{
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if (p->usbHandle != NULL) {
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usb_close(p->usbHandle);
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p->usbHandle = NULL;
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}
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}
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/* EOF */
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