Diff: uuid.cpp

Revision:

0:ace2e8d3ce79

diff -r 000000000000 -r ace2e8d3ce79 uuid.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uuid.cpp	Fri Nov 29 14:42:22 2013 +0000
@@ -0,0 +1,177 @@
+#include <stdio.h>
+#include <string.h>
+
+#include "uuid.h"
+
+/**************************************************************************/
+/*!
+    @brief  Creates an empty 128-bit UUID
+            
+    @note   This UUID must be assigned a valid value via the 'update'
+            function before it can be safely used!
+*/
+/**************************************************************************/
+UUID::UUID(void)
+{
+    memset(base, 0, 16);
+    value = 0;
+    type  = UUID_TYPE_SHORT;
+}
+
+/**************************************************************************/
+/*!
+    @brief  Creates a new 128-bit UUID
+            
+    @note   The UUID is a unique 128-bit (16 byte) ID used to identify
+            different service or characteristics on the BLE device.
+            
+    @note   When creating a UUID, the constructor will check if all bytes
+            except bytes 2/3 are equal to 0.  If only bytes 2/3 have a
+            value, the UUID will be treated as a short/BLE UUID, and the
+            .type field will be set to UUID::UUID_TYPE_SHORT.  If any
+            of the bytes outside byte 2/3 have a non-zero value, the UUID
+            will be considered a 128-bit ID, and .type will be assigned 
+            as UUID::UUID_TYPE_LONG. 
+
+    @param[in]  uuid_base
+                The 128-bit (16-byte) UUID value.  For 128-bit values,
+                assign all 16 bytes.  For 16-bit values, assign the
+                16-bits to byte 2 and 3, and leave the rest of the bytes
+                as 0.
+
+    @section EXAMPLE
+
+    @code
+
+    // Create a short UUID (0x180F)
+    uint8_t shortID[16] = { 0, 0, 0x0F, 0x18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+    UUID ble_uuid = UUID(shortID);
+    // ble_uuid.type  = UUID_TYPE_SHORT
+    // ble_uuid.value = 0x180F
+    
+    // Creeate a long UUID
+    uint8_t longID[16] = { 0x00, 0x11, 0x22, 0x33,
+                           0x44, 0x55, 0x66, 0x77, 
+                           0x88, 0x99, 0xAA, 0xBB, 
+                           0xCC, 0xDD, 0xEE, 0xFF };
+    UUID custom_uuid = UUID(longID);
+    // custom_uuid.type  = UUID_TYPE_LONG
+    // custom_uuid.value = 0x3322
+    // custom_uuid.base  = 00 11 22 33 44 55 66 77 88 99 AA BB CC DD EE FF
+   
+    @endcode
+*/
+/**************************************************************************/
+UUID::UUID(uint8_t const uuid_base[16])
+{
+    memcpy(base, uuid_base, 16);
+    value = (uint16_t)((uuid_base[3] << 8) | (uuid_base[2]));
+
+    /* Check if this is a short of a long UUID */
+    if (uuid_base[0]  + uuid_base[1]  +
+        uuid_base[4]  + uuid_base[5]  + uuid_base[6]  + uuid_base[7] +
+        uuid_base[8]  + uuid_base[9]  + uuid_base[10] + uuid_base[11] +
+        uuid_base[12] + uuid_base[13] + uuid_base[14] + uuid_base[15] == 0)
+    {
+        type = UUID_TYPE_SHORT; 
+    }
+    else
+    {
+        type = UUID_TYPE_LONG;
+    }
+}
+
+/**************************************************************************/
+/*!
+    @brief  Creates a short (16-bit) UUID
+
+    @param[in]  ble_uuid
+                The 16-bit BLE UUID value.
+*/
+/**************************************************************************/
+UUID::UUID(uint16_t const ble_uuid)
+{
+    memset(base, 0, 16);
+    memcpy(base+2, (uint8_t *)&ble_uuid, 2);
+    value = ble_uuid;
+    type = UUID_TYPE_SHORT;
+}
+
+/**************************************************************************/
+/*!
+    @brief  UUID destructor
+*/
+/**************************************************************************/
+UUID::~UUID(void)
+{
+}
+
+/**************************************************************************/
+/*!
+    @brief  Updates the value of the UUID
+    
+    @args[in]   uuid_base
+                The 128-bit value to use when updating the UUID.  For
+                16-bit IDs, insert the ID in bytes 2/3 in LSB format.
+                
+    @returns    BLE_ERROR_NONE (0) if everything executed correctly, or an
+                error code if there was a problem
+    @retval     BLE_ERROR_NONE
+                Everything executed correctly
+
+    @section EXAMPLE
+
+    @code
+   
+    @endcode    
+*/
+/**************************************************************************/
+ble_error_t UUID::update(uint8_t const uuid_base[16])
+{
+    memcpy(base, uuid_base, 16);
+    value = (uint16_t)((uuid_base[3] << 8) | (uuid_base[2]));
+
+    /* Check if this is a short of a long UUID */
+    if (uuid_base[0]  + uuid_base[1]  +
+        uuid_base[4]  + uuid_base[5]  + uuid_base[6]  + uuid_base[7] +
+        uuid_base[8]  + uuid_base[9]  + uuid_base[10] + uuid_base[11] +
+        uuid_base[12] + uuid_base[13] + uuid_base[14] + uuid_base[15] == 0)
+    {
+        type = UUID_TYPE_SHORT; 
+    }
+    else
+    {
+        type = UUID_TYPE_LONG;
+    }
+    
+    return BLE_ERROR_NONE;
+}
+
+/**************************************************************************/
+/*!
+    @brief  Updates the value of the UUID
+    
+    @args[in]   ble_uuid
+                The 16-bit value to use when updating the UUID.
+                
+    @returns    BLE_ERROR_NONE (0) if everything executed correctly, or an
+                error code if there was a problem
+    @retval     BLE_ERROR_NONE
+                Everything executed correctly
+
+    @section EXAMPLE
+
+    @code
+   
+    @endcode    
+*/
+/**************************************************************************/
+ble_error_t UUID::update(uint16_t const ble_uuid)
+{
+    memset(base, 0, 16);
+    memcpy(base+2, (uint8_t *)&ble_uuid, 2);
+    value = ble_uuid;
+    type = UUID_TYPE_SHORT;
+    
+    return BLE_ERROR_NONE;
+}