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Bluetooth Low Energy
Diff: ble/UUID.h
- Revision:
- 1183:1589830dbdb7
- Parent:
- 1179:4ab722f8dca0
--- a/ble/UUID.h Wed Apr 06 19:15:34 2016 +0100
+++ b/ble/UUID.h Wed Apr 06 19:15:36 2016 +0100
@@ -24,9 +24,12 @@
#include "blecommon.h"
/**
- * A trivial converter for single hexadecimal character to unsigned-int.
- * @param c hexadecimal character.
- * @return the corresponding value as unsigned int.
+ * A trivial converter for single hexadecimal character to an unsigned integer.
+ *
+ * @param c
+ * Hexadecimal character.
+ *
+ * @return The corresponding value as unsigned integer.
*/
static uint8_t char2int(char c) {
if ((c >= '0') && (c <= '9')) {
@@ -40,26 +43,47 @@
}
}
+/**
+ * An instance of this class represents a Universally Unique Identifier (UUID)
+ * in the BLE API.
+ */
class UUID {
public:
+ /**
+ * Enumeration of the possible types of UUIDs in BLE with regards to length.
+ */
enum UUID_Type_t {
- UUID_TYPE_SHORT = 0, // Short BLE UUID.
- UUID_TYPE_LONG = 1 // Full 128-bit UUID.
+ UUID_TYPE_SHORT = 0, /**< Short 16-bit UUID. */
+ UUID_TYPE_LONG = 1 /**< Full 128-bit UUID. */
};
/**
- * An enumeration to specify byte ordering of the long version of the UUID.
+ * Enumeration to specify byte ordering of the long version of the UUID.
*/
typedef enum {
- MSB, /*!< Most-significant byte first (at the smallest address) */
- LSB /*!< least-significant byte first (at the smallest address) */
+ MSB, /**< Most-significant byte first (at the smallest address) */
+ LSB /**< least-significant byte first (at the smallest address) */
} ByteOrder_t;
+ /**
+ * Type for a 16-bit UUID.
+ */
typedef uint16_t ShortUUIDBytes_t;
+ /**
+ * Length of a long UUID in bytes.
+ */
static const unsigned LENGTH_OF_LONG_UUID = 16;
+ /**
+ * Type for a 128-bit UUID.
+ */
typedef uint8_t LongUUIDBytes_t[LENGTH_OF_LONG_UUID];
+ /**
+ * Maximum length of a string representation of a UUID not including the
+ * null termination ('\0'): two characters per
+ * byte plus four '-' characters.
+ */
static const unsigned MAX_UUID_STRING_LENGTH = LENGTH_OF_LONG_UUID * 2 + 4;
public:
@@ -83,30 +107,32 @@
size_t baseIndex = 0;
uint8_t tempUUID[LENGTH_OF_LONG_UUID];
- // Iterate through string, abort if NULL is encountered prematurely.
- // Ignore upto four hyphens.
+ /*
+ * Iterate through string, abort if NULL is encountered prematurely.
+ * Ignore upto four hyphens.
+ */
for (size_t index = 0; (index < MAX_UUID_STRING_LENGTH) && (baseIndex < LENGTH_OF_LONG_UUID); index++) {
if (stringUUID[index] == '\0') {
- // error abort
+ /* Error abort */
break;
} else if (stringUUID[index] == '-') {
- // ignore hyphen
+ /* Ignore hyphen */
continue;
} else if (nibble) {
- // got second nibble
+ /* Got second nibble */
byte |= char2int(stringUUID[index]);
nibble = false;
- // store copy
+ /* Store copy */
tempUUID[baseIndex++] = byte;
} else {
- // got first nibble
+ /* Got first nibble */
byte = char2int(stringUUID[index]) << 4;
nibble = true;
}
}
- // populate internal variables if string was successfully parsed
+ /* Populate internal variables if string was successfully parsed */
if (baseIndex == LENGTH_OF_LONG_UUID) {
setupLong(tempUUID, UUID::MSB);
} else {
@@ -119,13 +145,13 @@
/**
* Creates a new 128-bit UUID.
*
+ * @param[in] longUUID
+ * The 128-bit (16-byte) UUID value.
+ * @param[in] order
+ * The bit order of the UUID, MSB by default.
+ *
* @note The UUID is a unique 128-bit (16 byte) ID used to identify
* different service or characteristics on the BLE device.
- *
- * @param longUUID
- * The 128-bit (16-byte) UUID value.
- * @param order
- * The bit order of the UUID, MSB by default.
*/
UUID(const LongUUIDBytes_t longUUID, ByteOrder_t order = UUID::MSB) : type(UUID_TYPE_LONG), baseUUID(), shortUUID(0) {
setupLong(longUUID, order);
@@ -134,9 +160,6 @@
/**
* Creates a new 16-bit UUID.
*
- * @note The UUID is a unique 16-bit (2 byte) ID used to identify
- * different service or characteristics on the BLE device.
- *
* For efficiency, and because 16 bytes would take a large chunk of the
* 27-byte data payload length of the Link Layer, the BLE specification adds
* two additional UUID formats: 16-bit and 32-bit UUIDs. These shortened
@@ -150,34 +173,61 @@
*
* 0000xxxx-0000-1000-8000-00805F9B34FB
*
+ * @param[in] _shortUUID
+ * The short UUID value.
+ *
* @note Shortening is not available for UUIDs that are not derived from the
* Bluetooth Base UUID. Such non-standard UUIDs are commonly called
* vendor-specific UUIDs. In these cases, you’ll need to use the full
* 128-bit UUID value at all times.
*
- * @note We don't yet support 32-bit shortened UUIDs.
+ * @note The UUID is a unique 16-bit (2 byte) ID used to identify
+ * different service or characteristics on the BLE device.
+ *
+ * @note We do not yet support 32-bit shortened UUIDs.
*/
UUID(ShortUUIDBytes_t _shortUUID) : type(UUID_TYPE_SHORT), baseUUID(), shortUUID(_shortUUID) {
/* Empty */
}
+ /**
+ * Copy constructor.
+ *
+ * @param[in] source
+ * The UUID to copy.
+ */
UUID(const UUID &source) {
type = source.type;
shortUUID = source.shortUUID;
memcpy(baseUUID, source.baseUUID, LENGTH_OF_LONG_UUID);
}
+ /**
+ * The empty constructor.
+ *
+ * @note The type of the resulting UUID instance is UUID_TYPE_SHORT and the
+ * value BLE_UUID_UNKNOWN.
+ */
UUID(void) : type(UUID_TYPE_SHORT), shortUUID(BLE_UUID_UNKNOWN) {
/* empty */
}
/**
- * Fill in a 128-bit UUID; this is useful when the UUID isn't known at the time of the object construction.
+ * Fill in a 128-bit UUID; this is useful when the UUID is not known at the
+ * time of the object construction.
+ *
+ * @param[in] longUUID
+ * The UUID value to copy.
+ * @param[in] order
+ * The byte ordering of the UUID at @p longUUID.
*/
void setupLong(const LongUUIDBytes_t longUUID, ByteOrder_t order = UUID::MSB) {
type = UUID_TYPE_LONG;
if (order == UUID::MSB) {
- // Switch endian. Input is big-endian, internal representation is little endian.
+ /*
+ * Switch endian. Input is big-endian, internal representation
+ * is little endian.
+ */
std::reverse_copy(longUUID, longUUID + LENGTH_OF_LONG_UUID, baseUUID);
} else {
std::copy(longUUID, longUUID + LENGTH_OF_LONG_UUID, baseUUID);
@@ -186,8 +236,23 @@
}
public:
- UUID_Type_t shortOrLong(void) const {return type; }
- const uint8_t *getBaseUUID(void) const {
+ /**
+ * Check whether this UUID is short or long.
+ *
+ * @return UUID_TYPE_SHORT if the UUID is short, UUID_TYPE_LONG otherwise.
+ */
+ UUID_Type_t shortOrLong(void) const {
+ return type;
+ }
+
+ /**
+ * Get a pointer to the UUID value based on the current UUID type.
+ *
+ * @return A pointer to the short UUID if the type is set to
+ * UUID_TYPE_SHORT. Otherwise, a pointer to the long UUID if the
+ * type is set to UUID_TYPE_LONG.
+ */
+ const uint8_t *getBaseUUID(void) const {
if (type == UUID_TYPE_SHORT) {
return (const uint8_t*)&shortUUID;
} else {
@@ -195,11 +260,33 @@
}
}
- ShortUUIDBytes_t getShortUUID(void) const {return shortUUID;}
- uint8_t getLen(void) const {
+ /**
+ * Get the short UUID.
+ *
+ * @return The short UUID.
+ */
+ ShortUUIDBytes_t getShortUUID(void) const {
+ return shortUUID;
+ }
+
+ /**
+ * Get the length (in bytes) of the UUID based on its type.
+ *
+ * @retval sizeof(ShortUUIDBytes_t) if the UUID type is UUID_TYPE_SHORT.
+ * @retval LENGTH_OF_LONG_UUID if the UUID type is UUID_TYPE_LONG.
+ */
+ uint8_t getLen(void) const {
return ((type == UUID_TYPE_SHORT) ? sizeof(ShortUUIDBytes_t) : LENGTH_OF_LONG_UUID);
}
+ /**
+ * Overload == operator to enable UUID comparisons.
+ *
+ * @param[in] other
+ * The other UUID in the comparison.
+ *
+ * @return true if this == @p other, false otherwise.
+ */
bool operator== (const UUID &other) const {
if ((this->type == UUID_TYPE_SHORT) && (other.type == UUID_TYPE_SHORT) &&
(this->shortUUID == other.shortUUID)) {
@@ -214,14 +301,31 @@
return false;
}
+ /**
+ * Overload != operator to enable UUID comparisons.
+ *
+ * @param[in] other
+ * The other UUID in the comparison.
+ *
+ * @return true if this != @p other, false otherwise.
+ */
bool operator!= (const UUID &other) const {
return !(*this == other);
}
private:
- UUID_Type_t type; // UUID_TYPE_SHORT or UUID_TYPE_LONG
- LongUUIDBytes_t baseUUID; // The long UUID
- ShortUUIDBytes_t shortUUID; // 16 bit UUID
+ /**
+ * The UUID type. Refer to UUID_Type_t.
+ */
+ UUID_Type_t type;
+ /**
+ * The long UUID value.
+ */
+ LongUUIDBytes_t baseUUID;
+ /**
+ * The short UUID value.
+ */
+ ShortUUIDBytes_t shortUUID;
};
#endif // ifndef __UUID_H__
\ No newline at end of file