STA2500D datasheet(49/57 Pages) STMICROELECTRONICS

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STA2500D

HCI transport layer

Doc ID 16067 Rev 1

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8.2

Enhanced H4 SPI transport layer

This is the default SPI mode.

The enhanced H4 protocol is based on the H4 protocol as defined by the SIG []. In addition

a messaging protocol is defined for controlling the Deep Sleep mode entry and wake-up,

see Section : Deep sleep mode entry and wake-up through enhanced H4 SPI.

Three messages are defined: SLEEP, WAKEUP and WOKEN. More details on the

messages are available upon request.

At SPI level, the default configuration is used:

●

The SPI interface works in half duplex mode

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The data are exchanged in multiple of 16 bits

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The most significant byte first

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The most significant bit first

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There is a read and write command from the Host to access the Bluetooth device

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The Bluetooth device requests a transfer by the activation of the interrupt line

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Flow control on SPI_DO and in a register

8.3

H4 SPI transport layer

As stated in the previous section, the SPI interface is configurable. One possible

configuration is the following, implementing a simple H4 SPI transport layer.

●

The SPI interface works in half duplex mode

●

The data are exchanged in multiples of 8 bits

●

The least significant bit first

●

There is a read and write command from the Host to access the Bluetooth device

●

The Bluetooth device requests a transfer by the activation of the interrupt line

●

Flow control on BT_SPI_DO and in a register

8.4

eSCO over HCI

The STA2500D supports synchronous data packet transfer (eSCO) over HCI.

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