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hd44780/serial: Add support for adjustable backlight. Solve some possible

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problems that may arise by comparing signed and unsigned char values.
This commit is contained in:
mmdolze
2012-03-11 07:32:38 +00:00
parent 1579d452d9
commit dc49e0a96e
3 changed files with 63 additions and 27 deletions
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server/drivers/hd44780-serial.h
+47 -21
View File
@@ -9,29 +9,55 @@
#define SERIALIF_NAME_LENGTH 20
#define DEFAULT_DEVICE "/dev/lcd"
/** Declares one configuration enty in the serial_interfaces table */
/** Declares one configuration entry in the serial_interfaces table */
struct hd44780_SerialInterface {
int connectiontype; /**< Connection type from hd44780 config */
/** Command escape character. This is always sent, even if 0x00 */
char instruction_escape;
/** Data escape character. Only sent if not NUL data is within range
* configure by data_escape_min and data_escape_max. */
char data_escape;
char data_escape_min; /**< Escaped data lower limit (inclusive) */
char data_escape_max; /**< Escaped data upper limit (exclusive) */
unsigned int default_bitrate; /**< Bitrate device is set to by default */
char if_bits; /**< Initialize to 8 or 4 bit interface */
char keypad; /**< Flag: keypad available */
char keypad_escape; /**< Keys are escaped with this character */
char backlight; /**< Flag: backlight available */
/** Escape character to send to indicate a backlight state change */
char backlight_escape;
char backlight_off; /**< Character sent to set display off */
char backlight_on; /**< Character sent to set display on */
int connectiontype; /**< Connection type from hd44780 config */
/** \name Instruction / data escape sequence
* Determines if escape characters have to be sent for instruction or
* data values. The instruction escape character is always sent, even
* if its value is 0x00. The data escape character is only sent it it
* is not NUL and data is within range set by data_escape_min and
* data_escape_max.
*@{*/
unsigned char instruction_escape; /**< Instruction escape character. */
unsigned char data_escape; /**< Data escape character. */
unsigned char data_escape_min; /**< Escaped data lower limit (inclusive) */
unsigned char data_escape_max; /**< Escaped data upper limit (exclusive) */
/**@}*/
unsigned int default_bitrate; /**< Bitrate device is set to by default */
char if_bits; /**< Initialize to 8 or 4 bit interface */
/** \name Keypad settings
*@{*/
char keypad; /**< Flag: keypad available */
unsigned char keypad_escape; /**< Keys are escaped with this character */
/**@}*/
/** \name Backlight options
* The backlight flag determines the type of backlight available.
* If the backlight is just switchable, the backlight_off or
* backlight_on characters are sent according to backlight state.
* If the backlight is switchable, these characters must define a range
* of values that are understood as different brightness levels by
* the display. The 'brightness' and 'offbrightness' values from config
* are used according to the backlight state and mapped to this range.
*@{*/
char backlight; /**< Flag: backlight available
* 0 = none, 1 = switchable, 2 = adjustable */
unsigned char backlight_escape; /**< Escape character to send to indicate
* a backlight state change */
unsigned char backlight_off; /**< Character sent to set display off
* or minimum value if adjustable */
unsigned char backlight_on; /**< Character sent to set display on
* or maximum value if adjustable */
/**@}*/
/** Flag: Device has multiple controllers. If enabled, the displayID
* is added to data escape */
char multiple_displays;
char end_code; /**< Code to send on shutdown */
* is added to data_escape and it is always sent. */
char multiple_displays;
unsigned char end_code; /**< Code to send on shutdown */
};
/**