BLUENRG-2 datasheet(60/190 Pages) STMICROELECTRONICS

60 / 190 page

Functional details

BlueNRG-2

60/190

DocID030675 Rev 2

RXFRM value is dummy AND the written number of frames in RXFRM is

received.

If the TXFIFO is not empty, the master first transmits the data available in the

TXFIFO and receives the data from the slave (like the full duplex mode). The

RXFRM register is not decremented. When all the data available in TXFIFO are

transmitted, the TXFIFO becomes empty (case a), then the dummy character

from the CHN register are transmitted for each frame received. The RXFRM

zero and the written number of frames in RXFRM is received, the interface does

not run anymore. The user has to write the RXFRM (with value greater than zero)

by software to reactivate the interface.

In all cases, the RXFRM is decremented by one only if the TXFIFO is empty. The

RFRM is decremented before the data is sent.

If the software fills the TXFIFO while the SPI is transmitting the dummy character,

then the words of TXFIFO should be ignored and we should not send them in this

mode, only the dummy -character are transmitted.



Combined mode (SPIM = 11b): the sequence of combined mode is:

The software sets the mode to combined mode: (SPIM=11).

The software writes to the WDTXF register the "number of frames to be received

by the slave (a value greater than zero) from TXFIFO master".

If the number of words written in the WDTXF register are sent (WDTXF is equal to zero)

but the RXFRM register is not equal to zero, the master transmits the dummy character

(defined in CHM register) and receives the slave data, decrementing the RXFRM register

by one. Once the RXFRM register is equal to zero and all the data written in RXFRM are

sent, the interface is stopped.

When the RXFRM register is zero and WDTXF is not equal to zero and the TXFIFO of the

master and of slave are not empty, the master transmits the data from TXFIFO and

receives the data from the slave. Before the data is sent from TXFIFO, the WDTXF is

decremented by one. When the WDTXF register is zero and all the numbers written in this

The interface is stopped when:



WDTXF and RXFRM registers are equal to zero.



WDTXF register is not equal to zero and TXFIFO is empty.



RXFRM register is not equal to zero, the WDTXF register is zero and TXFIFO is not

empty.

For each data transmission (TXFIFO data or CHN register data), the data slave is received.

WDTXF is decremented by one only at each data transmission from TXFIFO. The

decrementing is done before the words are sent out.

RXFRM is decremented by one only at each dummy character transmission from the CHN

When we start decrementing one of the registers (RXFRM or WDTXF), we must decrement

until we reach zero and we send the last words before starting the decrement of other

registers (RXFRM or WDTXF).

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