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support getting/setting contrast & brightness for hd44780 lcd2usb connection type (M. Dolze)

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This commit is contained in:
marschap
2007-10-21 19:53:34 +00:00
parent 7ab141d7bc
commit af725ce9cd
5 changed files with 107 additions and 53 deletions
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server/drivers/hd44780-lcd2usb.c
+96 -46
View File
@@ -5,6 +5,7 @@
*/
/* Copyright (C) 2007 Peter Marschall <peter@adpm.de>
* 2007 Markus Dolze
*
* This file is released under the GNU General Public License. Refer to the
* COPYING file distributed with this package.
@@ -28,26 +29,25 @@
static usb_dev_handle *lcd2usb;
// initialize the driver
/**
* Initialize the driver.
* \param drvthis Pointer to driver structure.
* \retval 0 Success.
* \retval -1 Error.
*/
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);
drvthis->set_contrast = lcd2usb_set_contrast;
drvthis->set_brightness = lcd2usb_set_brightness;
/* try to find USB device */
#if 0
@@ -72,22 +72,14 @@ hd_init_lcd2usb(Driver *drvthis)
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';
/* read firmware version */
unsigned char buffer[2];
//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 (usb_control_msg(lcd2usb, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN,
LCD2USB_GET_FWVER, 0, 0, (char *)buffer, sizeof(buffer), 1000) == 2)
report(RPT_INFO, "hd_init_lcd2usb: device with firmware version %d.%02d found", buffer[0], buffer[1]);
}
}
}
@@ -95,7 +87,6 @@ hd_init_lcd2usb(Driver *drvthis)
if (lcd2usb != NULL) {
debug(RPT_DEBUG, "hd_init_lcd2usb: opening device succeeded");
}
else {
report(RPT_ERR, "hd_init_lcd2usb: no (matching) LCD2USB device found");
@@ -104,48 +95,102 @@ hd_init_lcd2usb(Driver *drvthis)
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");
}
/* set contrast: value comes from global hd44780 init */
lcd2usb_set_contrast(drvthis, p->contrast);
return 0;
}
// lcd2usb_HD44780_senddata
/**
* Send data or commands to the display.
* \param p Pointer to driver's data structure.
* \param displayID ID of the display (or 0 for all) to send data to.
* \param flags Defines whether to end a command or data.
* \param ch The value to send.
*/
void
lcd2usb_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch)
{
int type = (flags == RS_DATA) ? LCD2USB_DATA : LCD2USB_CMD;
int id = (displayID == 0) ? LCD2USB_CTRL_BOTH
int type = (flags == RS_DATA) ? LCD2USB_DATA : LCD2USB_CMD;
int id = (displayID == 0) ? LCD2USB_CTRL_BOTH
: ((displayID == 1) ? LCD2USB_CTRL_0 : LCD2USB_CTRL_1);
usb_control_msg(lcd2usb, USB_TYPE_VENDOR, (type | id), ch, 0, NULL, 0, 1000);
usb_control_msg(lcd2usb, USB_TYPE_VENDOR, (type | id), ch, 0, NULL, 0, 1000);
}
/**
* Turn the LCD backlight on or off.
* \param p Pointer to driver's data structure.
* \param state New backlight status.
*/
void
lcd2usb_HD44780_backlight(PrivateData *p, unsigned char state)
{
// Get backlight brightness.
int promille = (state == BACKLIGHT_ON) ? p->brightness : p->offbrightness;
// And set it (converted from [0,1000] -> [0,255]).
usb_control_msg(lcd2usb, USB_TYPE_VENDOR, LCD2USB_SET_BRIGHTNESS,
(promille * 255) / 1000, 0, NULL, 0, 1000);
}
/**
* Change LCD contrast.
* \param drvthis Pointer to driver structure.
* \param promille New contrast value in promille.
*/
void
lcd2usb_set_contrast(Driver *drvthis, int promille)
{
PrivateData *p = drvthis->private_data;
// Check if value within range
if ((promille < 0) || (promille > 1000))
return;
// And set it (converted from [0,1000] -> [0,255]).
// If successful, update the local value.
if (usb_control_msg(lcd2usb, USB_TYPE_VENDOR, LCD2USB_SET_CONTRAST,
(promille * 255) / 1000, 0, NULL, 0, 1000) < 0)
report(RPT_WARNING, "hd_init_lcd2usb: setting contrast failed");
else
p->contrast = promille;
}
/**
* Set on/off brightness.
* The value is not actually transmitted to the display. lcd2usb_hd44780_backlight
* has to be called to do this.
* \param drvthis Pointer to driver structure.
* \param state Brightness state (on/off) for which we want to store the value.
* \param promille New brightness in promille.
*/
void
lcd2usb_set_brightness(Driver *drvthis, int state, int promille)
{
PrivateData *p = drvthis->private_data;
// Check if value within range
if (promille < 0 || promille > 1000)
return;
/* store the software value */
if (state == BACKLIGHT_ON)
p->brightness = promille;
else
p->offbrightness = promille;
}
/**
* Read keypress.
* \param p Pointer to driver's data structure.
* \return Bitmap of the pressed keys.
*/
unsigned char
lcd2usb_HD44780_scankeypad(PrivateData *p)
{
@@ -164,6 +209,11 @@ lcd2usb_HD44780_scankeypad(PrivateData *p)
return '\0';
}
/**
* Close the driver (do necessary clean-up).
* \param p Pointer to driver's data structure.
*/
void
lcd2usb_HD44780_close(PrivateData *p)
{
server/drivers/hd44780-lcd2usb.h
+3 -4
View File
@@ -31,10 +31,6 @@
#define LCD2USB_GET_CTRL (LCD2USB_GET | (2<<3))
#define LCD2USB_GET_RESERVED1 (LCD2USB_GET | (3<<3))
#define DEFAULT_CONTRAST 300
#define DEFAULT_BRIGHTNESS 600
#define DEFAULT_OFFBRIGHTNESS 300
// initialise this particular driver
int hd_init_lcd2usb(Driver *drvthis);
@@ -42,5 +38,8 @@ void lcd2usb_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned
void lcd2usb_HD44780_backlight(PrivateData *p, unsigned char state);
unsigned char lcd2usb_HD44780_scankeypad(PrivateData *p);
void lcd2usb_HD44780_close(PrivateData *p);
void lcd2usb_set_contrast(Driver *drvthis, int promille);
void lcd2usb_set_brightness(Driver *drvthis, int state, int promille);
#endif