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BLE Command Format

• This section explains the general command format, commands should be sent to the module in the specified format.
• Format is same for both Classic and LE modes.
• Commands are sent to the module and responses are read from the module using frame write/ frame read (as mentioned in the preceding sections), these commands are called as command frames.
• The format of the command frames are divided into two parts:
  • Frame descriptor (16 bytes)
  • Frame Body / Payload (multiples of 4 bytes)

The Command frame format is shown below. This description is for a Little Endian System.

Figure 1 - Command Frame Format

The following table provides the general description of the frame descriptor.

Frame Descriptor

Three types of frames will get exchanged between the module and the host.

1. Request/Command Frames - These are sent from Host to Module. Each Request/ Command has an associated response with it.

2. Response Frames – These are sent from Module to Host. These are given in response to the previous Request/Command from the Host. Each command has a single response.

3. Event Frames – These are sent from Module to Host. These are given when there are multiple responses for a particular Request/Command frame. There is an Asynchronous message to be sent to host.

The following are the types of frame requests and responses and the corresponding codes. The commands are different for both Classic and LE modes. The below Table lists the Command, Response and Event frames in LE mode.

In both the modes, the corresponding code is to be filled in W1 [15:0] mentioned in the Table above.

Frame Request Types and Responses together with corresponding Codes

Response IDs in BLE Mode

Event IDs in BLE Mode