Ezurio BISM2 Guide de l'utilisateur télécharger pdf (Page 32)

9. Miscellaneous Features

This chapter describes various features which cannot be categorized appropriately.

9.1 RI dependent Start-up Mode

The UART_RI line can be configured as an input and on power its state can be used to force the

device into one of two modes. See description for S Registers 565 to 569 inclusive for more

details.

For example, the feature could allow a device to make an outgoing connection if RI is in one state,

and be ready for an incoming connection in the other.

9.2 Pulse a GPIO pin

To flash a GPIO pin, set it as an output using S reg 610 and then use S reg 585 to 587 inclusive to

set the pin, period and duty cycle respectively.

9.3 Flash LED on Connectable Mode

S reg 534 now takes a value up to 2. A value of 2 configures it so that it will blink when the

module is in connectable mode.

9.4 Reset via BREAK

The module can be reset by sending a BREAK signal. A BREAK signal exists when the module’s

UART_RX input is in a non-idle state (0v) for more that 125 milliseconds.

9.5 Digital I/O Cable Replacement

The module has a number of general purpose digital I/O pins. The direction of these are specified

via S Reg 610.

When S Reg 531 is set to 4 at both ends of the connection, then on connection, any changes in the

states of the inputs at one end will be transmitted to the peer, which will then reflect those states

on the appropriate I/O pins if they have been configured as outputs.

It is recommended that the value of S Reg 610 at one end be the one’s complement of the other

end. That way, inputs at one end are mirrored at the other end and vice versa.

Note that due to inherent latency of Bluetooth transmission, expect the change of state to be

delayed. This value is typically 100ms and can be much more if the quality of the link is bad which

results in many retries.

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Ezurio BISM2 Guide de l'utilisateur Page 32