mangavalk/lcdproc
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Add a flush method to the hardware depended functions. It is called whenever

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a sequence of characters or commands have to be terminated (common_init,
position, flush).  Modify the lcd2usb subdriver to implement a small command
buffer and implement flush().
This commit is contained in:
mmdolze
2010-01-23 17:48:00 +00:00
parent 287b933e79
commit c9623a72da
5 changed files with 58 additions and 28 deletions
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server/drivers/hd44780-lcd2usb.c
+42 -28
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@@ -31,6 +31,12 @@ void lcd2usb_HD44780_backlight(PrivateData *p, unsigned char state);
unsigned char lcd2usb_HD44780_scankeypad(PrivateData *p);
void lcd2usb_HD44780_close(PrivateData *p);
void lcd2usb_HD44780_set_contrast(PrivateData *p, unsigned char value);
void lcd2usb_HD44780_flush(PrivateData *p);
/* small data buffer */
unsigned char buffer[LCD2USB_MAX_CMD];
int buffer_current_type_id = -1;
int buffer_current_use = 0;
/**
@@ -63,6 +69,7 @@ hd_init_lcd2usb(Driver *drvthis)
p->hd44780_functions->scankeypad = lcd2usb_HD44780_scankeypad;
p->hd44780_functions->close = lcd2usb_HD44780_close;
p->hd44780_functions->set_contrast = lcd2usb_HD44780_set_contrast;
p->hd44780_functions->flush = lcd2usb_HD44780_flush;
/* try to find USB device */
#if 0
@@ -116,9 +123,9 @@ hd_init_lcd2usb(Driver *drvthis)
return 0;
}
/**
* Send data or commands to the display.
* Send data or command to the display. The data/command is internally
* queued.
* \param p Pointer to driver's private 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.
@@ -131,9 +138,41 @@ lcd2usb_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char
int id = (displayID == 0) ? LCD2USB_CTRL_BOTH
: ((displayID == 1) ? LCD2USB_CTRL_0 : LCD2USB_CTRL_1);
usb_control_msg(p->usbHandle, USB_TYPE_VENDOR, (type | id), ch, 0, NULL, 0, 1000);
/* flush current buffer if target or command type are different */
if ((buffer_current_type_id >= 0) && (buffer_current_type_id != (type | id)))
lcd2usb_HD44780_flush(p);
/* add new item to buffer */
buffer_current_type_id = (type | id);
buffer[buffer_current_use++] = ch;
/* flush buffer if it's full */
if (buffer_current_use == LCD2USB_MAX_CMD)
lcd2usb_HD44780_flush(p);
}
/**
* Actually send data or command to the display.
* \param p Pointer to driver's private data structure.
*/
void
lcd2usb_HD44780_flush(PrivateData *p)
{
/* only if some data available */
if (buffer_current_use == 0)
return;
/* construct and send message */
usb_control_msg(p->usbHandle, USB_TYPE_VENDOR,
buffer_current_type_id | (buffer_current_use - 1),
buffer[0] | (buffer[1] << 8),
buffer[2] | (buffer[3] << 8),
NULL, 0, 1000);
/* buffer is now free again. Not necessary to clear what's in it. */
buffer_current_type_id = -1;
buffer_current_use = 0;
}
/**
* Turn display backlight on or off.
@@ -171,31 +210,6 @@ lcd2usb_HD44780_set_contrast(PrivateData *p, unsigned char value)
}
/**
* 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 private data structure.