about tx and rx in uart application

[DevineFelix]

HI,I am using 51822 to realize a double-direction uart link with a ble client and a server chip.Now the double-direction link is established and each side can receive packet from peer. But data rate is not of satisfication, especially for the direction from client to server. I read some post as follows: devzone.nordicsemi.com/.../ devzone.nordicsemi.com/.../ I imitated the method for data transfer from server to client in the case from client to server. but find no queued effect of data transfer. I think there must be some mistake in the tx characteristic setting or parameter setting such as ble_gattc_write_params_t . Can you give me some advice about above? Program example is better, because there are so few examples for client to server transfer to start with. Thank you.

[Stefan Birnir Sverrisson]

Hi

Are you writing with a write command or a write request? Writing with write command is much faster than write request as write request requires acknowledgement for each sent packet

[DevineFelix]

I tried both write command and write request, but found few differences. Write command is carried out some times until BLE_ERROR_NO_TX_BUFFERS is received. The procedure is implemented in a timer handler executed periodically in a poll mode with a condition that BLE_EVT_TX_COMPLETE is received. Number of packets per event With regard to number of packets per connection eventmentioned in devzone.nordicsemi.com/questi... is only 1. what shall i do to enlarge the throughput by increasing the Number of packets per event? thank you

[DevineFelix]

please forget about write command and write request. Now my problem is about the tx buffer count. thank you.

[DevineFelix]

I used the api sd_ble_tx_buffer_count_get(),and get the count of buffer is 1. Can it be changed to 6?

[DevineFelix]

Ok,after i read the S120 softdevice specification v1.0, i get to know that there can be only one packet per connection event in transmission and reception. My question update now- is there also only 1 packet per connection event when S110 and S120 communiate between each other ? thank you.

[DevineFelix]

Luckily the thoughput S120 can afford to offer can fullfill my application.