TELINK SEMICONDUCTOR TLSR8232 - Callback Function W

Telink TLSR8232 BLE SDK Developer Handbook
AN-19112700-E1 95 Ver.1.0.0
U16_LO(0x0111), U16_HI(0x0111), // bcdHID (USB HID version)，
0x11,0x01
0x00, // bCountryCode
0x01 // Flags
};
{0, 2, sizeof(hidInformation), sizeof(hidInformation), (u8*)(&hidinformationUUID),
(u8*)(hidInformation), 0,0},
In practical application, the key word “const” can be used to store the read-only 4-byte
hid information “0x01 0x00 0x01 0x11” into Flash. The “pAttrValue” points to the starting
address of hidInformation in Flash, while the “attrLen” is the actual length of
hidInformation. When Master reads this Attribute, “0x01000111” will be returned to
Master correspondingly.
Figure 3-31 shows a packet example captured by BLE sniffer when Master reads this
Attribute. Master uses the “ATT_Read_Req” command to set the target AttHandle as
0x23 (35), corresponding to the hid information in Attribute Table of SDK.
Figure 3-31 BLE Sniffer Packet Sample When Master Reads hidInformation
For Attribute “battery value” with Attribute Handle being 40, related code is as shown
below:
u8 my_batVal[1] = {99};
{0,1,2,1,(u8*)(&my_batCharUUID), (u8*)(my_batVal), 0},
In practical application, the “my_batVal” indicates current battery level and it will be
updated according to ADC sampling result; then Slave will actively notify or Master will
actively read to transfer the “my_batVal” to Master. The starting address of the
“my_batVal” stored in RAM will be pointed by the “pAttrValue”.
3.4.2.5 Callback Function w
The callback function w is a write function, its prototype is:
typedef int (*att_readwrite_callback_t)(void* p);
User must follow the format above to define callback write function. The callback function
w is optional, i.e. for an Attribute, user can select whether to set the callback write
function as needed (null pointer 0 indicates not setting callback write function).
The trigger condition for callback function w is: When Slave receives any Attribute PDU
with Attribute Opcode as shown below, Slave will check whether the callback function w
is set.
1) opcode = 0x12, Write Request, see Core_v5.0.