Why does my IF820 EZ-Serial not disconnect from an SPP connection?

Vela IF820

Answer

There are two ways to disconnect from an SPP connection.


  1. Using the CYSPP pin
  2. Using the disconnect command in non-transparent mode


SPP can be controlled through the hardware GPIO on the EZ-Serial firmware platform for Laird Vela IF820 series module. Cyspp pin, which is also used for CYSPP, can be used to control the SPP connection state:

• By default, CYSPP pin is set in HIGH state.

• Once SPP connection is active, CYSPP pin will be set to LOW state.

• If CYSPP pin is set to HIGH by an ex ternal MCU while a SPP connection is active, the SPP connection will be terminated.

Note there is a jumper on the IF820 DVK that may be pulling CYSPP high which needs to be removed before using this method of disconnection.

In non-transparent mode, though SPP is connected, user still can use command mode. Data receive from SPP connection will arrive with event “.SPPD”. See the command protocol_set_parse_mode (SPPM, ID=1/1) to use non-transparent mode. See bt_disconnect (/BTDIS, ID=14/6)