你好，
回答你的问题
1.作为Master的时候，最大的连接个数有没有不同？
CC2540最大3个 CC2640最大8个
2.连接上多个之后是同时进行数据交换还是轮流进行？这两种芯片在这个地方有什么不一样吗？
轮流进行，这个和蓝牙相关，和芯片无关。
3.CC2540有Dongle的例程，CC2640有吗？
CC2540作为dongle主要是CC2540带USB接口，如果你要做CC6240的dongle，可以加一个USB转串口芯片+CC2640.CC2640烧录hosttest的程序，可能需要你做少许修改。
4.其他比较重要的不同？
CC254x只支持BT4.1的协议栈，CC2640现在支持BT4.2协议栈。
蓝牙4.2的三大特性：
LE Secure Connections
Based on Diffie-Hellman Key Exchange, similar to the Secure Simple Pairing feature in classic Bluetooth
Closes the well-known security holes in BLE that exist in the BT 4.0/4.1 specs
LE Privacy 1.2
Keeps BLE devices from being tracked
Significant improvement over the confusing and little-used privacy features in BT 4.0/4.1 (which are being deprecated)
LE Data Length Extension
Increases data throughput by up to 2.5x by increasing the packet capacity by 10x
Michael Qian
你好，
回答你的问题
1.作为Master的时候，最大的连接个数有没有不同？
CC2540最大3个 CC2640最大8个
2.连接上多个之后是同时进行数据交换还是轮流进行？这两种芯片在这个地方有什么不一样吗？
轮流进行，这个和蓝牙相关，和芯片无关。
3.CC2540有Dongle的例程，CC2640有吗？
CC2540作为dongle主要是CC2540带USB接口，如果你要做CC6240的dongle，可以加一个USB转串口芯片+CC2640.CC2640烧录hosttest的程序，可能需要你做少许修改。
4.其他比较重要的不同？
CC254x只支持BT4.1的协议栈，CC2640现在支持BT4.2协议栈。
蓝牙4.2的三大特性：
LE Secure Connections
Based on Diffie-Hellman Key Exchange, similar to the Secure Simple Pairing feature in classic Bluetooth
Closes the well-known security holes in BLE that exist in the BT 4.0/4.1 specs
LE Privacy 1.2
Keeps BLE devices from being tracked
Significant improvement over the confusing and little-used privacy features in BT 4.0/4.1 (which are being deprecated)
LE Data Length Extension
Increases data throughput by up to 2.5x by increasing the packet capacity by 10x
Michael Qian
举报
