LAUNCHXL-CC26X2R1: What's interval of MAC retries?

Lawrence Lin

Part Number: LAUNCHXL-CC26X2R1
Other Parts Discussed in Thread: Z-STACK

Hi TI team,

I knew TI's Z-stack will take care of retries and the default is MAC acks.

Could I know what the interval of retries are for MAC acks? The interval means that how long the Z-stack will do retires.

Thanks

over 6 years ago

0 YiKai Chen over 6 years ago

Guru 735545 points

If you mean to know how long a nwk message would wait for an mac ack, it's defined by macAckWaitDuration which is 54 symbol periods (0.864 ms).

0 Lawrence Lin over 6 years ago in reply to YiKai Chen

Genius 4755 points

Hi YK,
I checked my macAckWaitDuration is 0x40. How to calculate this Hex into ms?
By the way, the interval means that next retries after I send a data and I do not receive any mac acks.
Thanks

0 YiKai Chen over 6 years ago in reply to Lawrence Lin

Guru 735545 points

If I am not wrong, z-stack use "{offsetof(macPib_t, ackWaitDuration), sizeof(uint8), 54, 54}, /* MAC_ACK_WAIT_DURATION */" in hmac_global.c for MAC_ACK_WAIT_DURATION

0 Ryan Brown1 over 6 years ago in reply to Lawrence Lin

TI__Guru**** 209097 points

Hi Lawrence,

The data rate for 2.4 GHz operation is 250 kbps. Four data bits are transferred during each symbol period. A symbol period is, therefore, 16 microseconds. 54 * 16 = 864. Internal Stack timing is based off of the symbol period. This value is defined in the IEEE 802.15.4 Standard and should not be altered.

Regards,
Ryan

0 Lawrence Lin over 6 years ago in reply to Ryan Brown1

Genius 4755 points

Hi Ryan,

It means if I do not receive any MAC acks within the time of 864ms after I send a data, the TI's Z-stack will retry to send the data again?? Am I right?

Thanks

0 YiKai Chen over 6 years ago in reply to Lawrence Lin

Guru 735545 points

For MAC retres, that's correct.

0 Lawrence Lin over 6 years ago in reply to YiKai Chen

Genius 4755 points

HI YK,
Noted.
Thanks

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LAUNCHXL-CC26X2R1: What's interval of MAC retries?