VAR-SOM-MX6 Eth IEEE.1588: Difference between revisions
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* Supports hardware- and software-controllable timer synchronization. | * Supports hardware- and software-controllable timer synchronization. | ||
* Provides a 4-channel IEEE 1588 timer. Each channel supports input capture and output compare using the 1588 counter. | * Provides a 4-channel IEEE 1588 timer. Each channel supports input capture and output compare using the 1588 counter. | ||
* Distribution of precise time information over the packetbased network | |||
* Offers high accuracy (sub micro sec) over the network | |||
= Connecting to BLE devices = | = Connecting to BLE devices = | ||
Revision as of 05:49, 15 November 2018
IEE1588 Hardware Timestamp
Overview of IEE1588 Hardware Timestamping
- Allows reference clock to be chosen independently of network speed.
- Software-programmable precise time-stamping of ingress and egress frames
- Timer monitoring capabilities for system calibration and timing accuracy management
- Precise time-stamping of external events with programmable interrupt generation
- Programmable event and interrupt generation for external system control
- Supports hardware- and software-controllable timer synchronization.
- Provides a 4-channel IEEE 1588 timer. Each channel supports input capture and output compare using the 1588 counter.
- Distribution of precise time information over the packetbased network
- Offers high accuracy (sub micro sec) over the network
Connecting to BLE devices
Use gatttool to connect to BLE devices. Pass "-t random" parameter if scan has reported a random MAC address.
root@var-som-mx6:~# gatttool -t random -b 74:B9:AB:CF:13:A9 -I [74:B9:AB:CF:13:A9][LE]> connect Attempting to connect to 74:B9:AB:CF:13:A9 [74:B9:AB:CF:13:A9][LE]> Connection successful Indication handle = 0x0003 value: 01 00 ff ff [74:B9:AB:CF:13:A9][LE]>
Accessing BLE devices
After successful connection BLE device characteristics can be accessed via gatttool. Continuing the example above:
[74:B9:AB:CF:13:A9][LE]> characteristics handle: 0x0002, char properties: 0x20, char value handle: 0x0003, uuid: 00002a05-0000-1000-8000-00805f9b34fb handle: 0x0015, char properties: 0x02, char value handle: 0x0016, uuid: 00002a00-0000-1000-8000-00805f9b34fb handle: 0x0017, char properties: 0x02, char value handle: 0x0018, uuid: 00002a01-0000-1000-8000-00805f9b34fb handle: 0x0019, char properties: 0x02, char value handle: 0x001a, uuid: 00002aa6-0000-1000-8000-00805f9b34fb handle: 0x0029, char properties: 0x12, char value handle: 0x002a, uuid: 00002a19-0000-1000-8000-00805f9b34fb [74:B9:AB:CF:13:A9][LE]> char-read-hnd 0x0002 Characteristic value/descriptor: 20 03 00 05 2a [74:B9:AB:CF:13:A9][LE]> char-read-hnd 0x0015 Characteristic value/descriptor: 02 16 00 00 2a [74:B9:AB:CF:13:A9][LE]> char-read-hnd 0x0017 Characteristic value/descriptor: 02 18 00 01 2a [74:B9:AB:CF:13:A9][LE]> char-read-hnd 0x0019 Characteristic value/descriptor: 02 1a 00 a6 2a [74:B9:AB:CF:13:A9][LE]> char-read-hnd 0x0029 Characteristic value/descriptor: 12 2a 00 19 2a
Receiving notifications from BLE devices
Notifications sent from connected BLE devices can be seen in gatttool. The example below shows notification sent by Android "BLE Peripheral Simulator"
[74:B9:AB:CF:13:A9][LE]> Notification handle = 0x002a value: 08 3c 00 00 [74:B9:AB:CF:13:A9][LE]>