1. Verifying Bandwidth on CC2650 BLE
Min-ju Kang
RTLAB

2. Contents Introduction GATT_write_ API Test & Result Conclusion
Further Work

3. Introduction Goal : Send Voice data over BLE on CC2650
 Verify Bandwidth 1Mbps
Peripheral
Server
Central
Client
BLE

4. GATT_write_ API GATT_writeCharValue GATT_writeNoRsp
GATT_writeLongCharValue

5. Sequence
GATT_writeCharValue
GATT_writeLongCharValue
GATT_writeNoRsp

6. Code – GATT_writeCharValue
MAX : 19Byte
//Use characteristic 6 UUID
attWriteReq_t req;
req.pValue = GATT_bm_alloc(connHandle, ATT_WRITE_REQ, SIMPLEPROFILE_CHAR6_LEN, NULL);
if(req.pValue != NULL) {
req.handle = charHd;
req.len = SIMPLEPROFILE_CHAR6_LEN;
memcpy(req.pValue, pSendDataChar6, SIMPLEPROFILE_CHAR6_LEN);
req.pValue[0] = sendCount; //0~53
req.sig = 0;
req.cmd = 0;
Status = GATT_WriteCharValue(connHandle, &req, selfEntity); }
Client

7. Code – GATT_writeNoRsp
MAX : 19Byte
//Use characteristic 6 UUID
attWriteReq_t req;
req.pValue = GATT_bm_alloc(connHandle, ATT_WRITE_REQ, SIMPLEPROFILE_CHAR6_LEN, NULL);
if(req.pValue != NULL) {
req.handle = charHd;
req.len = SIMPLEPROFILE_CHAR6_LEN;
memcpy(req.pValue, pSendDataChar6, SIMPLEPROFILE_CHAR6_LEN);
req.pValue[0] = sendCount; //0~53
req.sig = 0;
req.cmd = 1;
Status = GATT_WriteNoRsp(connHandle, &req); }
Client

8. Code – GATT_writeLongCharValue
MAX : 90Byte
//Use characteristic 7 UUID
attPrepareWriteReq_t preReq;
preReq.pValue = GATT_bm_alloc(connHandle, ATT_PREPARE_WRITE_REQ, SIMPLEPROFILE_CHAR7MAX_LEN, NULL);
if(preReq.pValue != NULL) {
preReq.handle = charHd;
preReq.len = SIMPLEPROFILE_CHAR7MAX_LEN;
memcpy(preReq.pValue, pPreSendDataChar7, SIMPLEPROFILE_CHAR7MAX_LEN);
preReq.pValue[0] = sendCount; //1~11
preReq.offset = 0;
longStatus = GATT_WriteLongCharValue(connHandle, &preReq, selfEntity); }
Client

9. Code - simpleProfile_WriteAttrCB
case SIMPLEPROFILE_CHAR7_UUID:
if ( status == SUCCESS ) {
uint8 *pCurValue = (uint8 *)pAttr->pValue;
memcpy( pCurValue, pValue, SIMPLEPROFILE_UNIT_LEN );
memcpy( simpleProfileTotal+totalLen, pCurValue, SIMPLEPROFILE_UNIT_LEN);
if(pAttr->pValue == simpleProfileChar7)
notifyApp = SIMPLEPROFILE_CHAR7;
totalLen += SIMPLEPROFILE_UNIT_LEN;
if(pAttr->pValue[0] == 12)
compareLen = SIMPLEPROFILE_CHAR7LAST_LEN;
if(totalLen >= compareLen)
totalLen = 0; }
break;
MAX : 18Byte
// Simple Char or Without Rsp
case SIMPLEPROFILE_CHAR6_UUID:
//Write the value
if ( status == SUCCESS ) {
uint8 *pCurValue = (uint8 *)pAttr->pValue;
memcpy( pCurValue, pValue, SIMPLEPROFILE_CHAR6_LEN );
if(pAttr->pValue == simpleProfileChar6)
notifyApp = SIMPLEPROFILE_CHAR6; }
break;
MAX : 19Byte
Server

10. Test & Result

11. Test & Result Test Stationary Condition Total data : 1026 byte
Connection interval : 8.75ms
GATT_
MAX Data
Send Count
writeCharValue
19 Byte 54
writeNoRsp
writeLongCharValue
90 Byte
(Unit : 18 Byte)
(36Byte)

12. Test & Result – GATT_writeCharValue
Total Time
: seconds
Bandwidth
: 13 Kbps (bits/sec)

13. Test & Result – GATT_writeNoRsp
Total Time
: seconds
Bandwidth
: Kbps

14. Test & Result – GATT_writeLongCharValue
90 Byte * 11번
+ 36 Byte
= 1026 Byte

15. Test & Result – GATT_writeLongCharValue
90 Byte * 11번
+ 36 Byte
= 1026 Byte
Total Time
: seconds
Bandwidth
: 8.21Kbps

16. Conclusion

17. Automatically divide data
Conclusion
Total Data : 1KByte
GATT_
Unit Data
Time [sec]
Bandwidth [Kbps]
Pros and Cons
Usage
writeCharValue
19 Byte 13
Basic
Critical Data
writeNoRsp
31.38
Without response
Voice Data
writeLongCharValue
90 Byte
8.21
Automatically divide data
Execute Write
Req & Rsp

18. Further Work Find How to use Voice data file.
Define Protocol and Data.
Test for sending Voice data.