4.1 Bluetooth Low Energy Status Indication Pin 1 (PB3) and Pin 2 (PB7)
Use both pins to indicate Bluetooth Low Energy connection: Bluetooth Low Energy UART transparent service status and MCU DFU status.
| BT_Status_Ind1 (PB3) | BT_Status_Ind2 (PB7) | RNBD451 Status |
|---|---|---|
| Low | Low | Bluetooth® Low Energy is disconnected |
| Data transmission channel is closed | ||
| High | Low | Bluetooth Low Energy is connected |
| Data transmission channel is closed | ||
| High | High | Bluetooth Low Energy is connected |
| Data transmission channel is opened | ||
| Low | High | MCU DFU mode (local or over OTAPC) |
Note: By default, the Bluetooth Status Indication feature is disabled
in the firmware. Enable this feature via
SR, <hex16> command
(SR,1000). For more details, refer to 5.2.15 Set Application Options (SR,<hex16>).