NUS send very slow.

RE: NUS send very slow.

ell_pass — Fri, 07 Oct 2022 12:28:29 GMT

Yes

[quote userid="4240" url="~/f/nordic-q-a/92346/nus-send-very-slow/389661"]And are you relaying data received on the UART interface like in the original sample?[/quote]

But in your project, "bt_nus_send"works well.

[quote userid="4240" url="~/f/nordic-q-a/92346/nus-send-very-slow/389661"]But how do you determine that the speed is limited by the Bluetooth connection and not the rate at which the send function is being called (bt_nus_send) ?[/quote]

RE: NUS send very slow.

Vidar Berg — Thu, 06 Oct 2022 14:14:11 GMT

But how do you determine that the speed is limited by the Bluetooth connection and not the rate at which the send function is being called (bt_nus_send) ? And are you relaying data received on the UART interface like in the original sample?

RE: NUS send very slow.

ell_pass — Thu, 06 Oct 2022 11:40:58 GMT

My project is used to send data to the phone as a slave. Each time it sends with a fixed packet length and counts the number received in 10s to calculate the speed. But the transfer speed is only about 2kbps.

RE: NUS send very slow.

Vidar Berg — Thu, 06 Oct 2022 11:10:43 GMT

1000 kbps is pretty good. What do you measure with your project for comparison?

RE: NUS send very slow.

ell_pass — Thu, 06 Oct 2022 11:06:15 GMT

Hello,

When phy is set to 2M(1M), the transfer speed is about 1Mkbps(500kbps)

RE: NUS send very slow.

Vidar Berg — Thu, 06 Oct 2022 09:28:37 GMT

Hello,

OK, what transfer speed were you able to get with my peripheral_uart_throughput_test.zip example (you can use JLink RTT Viewer to view the logs)?

RE: NUS send very slow.

ell_pass — Wed, 05 Oct 2022 13:08:32 GMT

Hello,

It didn't seem to work.

RE: NUS send very slow.

Vidar Berg — Wed, 05 Oct 2022 11:47:56 GMT

Hello,

[quote user="ell_pass"]I'm not sure what configuration file you provided[/quote]

I meant the 'nrf5340dk_nrf5340_cpunet.conf' file in child_image directory.

[quote user="ell_pass"]This is my prj.conf:[/quote]

You have selected CONFIG_BT_USER_DATA_LEN_UPDATE and CONFIG_BT_USER_PHY_UPDATE, but you have not added any code in main.c to initiate these procedures.

Please de-select these settings symbols to let the Bluetooth host initiate the procedures and see if that improves the throughput.

RE: NUS send very slow.

ell_pass — Wed, 05 Oct 2022 09:30:53 GMT

Hello,

I'm not sure what configuration file you provided, but I tried to modify my project.

After a pristine build(build/hci_rpmsg/zephyr):

in hci_rpmsg/boards:

What I do is just copied Kconfig and prj.conf from the "0285.peripheral_uart_throughput_test" into my project.

This is my Kconfig:

source "Kconfig.zephyr"

menu "Nordic UART BLE GATT service sample"

config BT_NUS_THREAD_STACK_SIZE
	int "Thread stack size"
	default 1024
	help
	  Stack size used in each of the two threads

config BT_NUS_UART_BUFFER_SIZE
	int "UART payload buffer element size"
	default 40
	help
	  Size of the payload buffer in each RX and TX FIFO element

config BT_NUS_SECURITY_ENABLED
	bool "Enable security"
	default y
	select BT_SMP
	help
	  "Enable BLE security for the UART service"

config BT_NUS_UART_DEV
	string "UART device name"
	default "UART_0"
	help
	  Name of the used UART device. The sample uses uart0 by default.
	  The UART device should not be used as logger backend.

config BT_NUS_UART_RX_WAIT_TIME
	int "Timeout for UART RX complete event"
	default 50
	help
	  Wait for RX complete event time in milliseconds

config BT_NUS_UART_ASYNC_ADAPTER
	bool "Enable UART async adapter"
	select SERIAL_SUPPORT_ASYNC
	help
	  Enables asynchronous adapter for UART drives that supports only
	  IRQ interface.

endmenu

This is my prj.conf:

#
# Copyright (c) 2018 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# Enable the UART driver
CONFIG_UART_ASYNC_API=y
CONFIG_NRFX_UARTE0=y
CONFIG_SERIAL=y

CONFIG_GPIO=y

# Make sure printk is printing to the UART console
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y

CONFIG_HEAP_MEM_POOL_SIZE=2048

CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="Nordic_UART_Service"
CONFIG_BT_DEVICE_APPEARANCE=833
CONFIG_BT_MAX_CONN=1
CONFIG_BT_MAX_PAIRED=1

# Enable the NUS service
CONFIG_BT_NUS=y

# Enable bonding
CONFIG_BT_SETTINGS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_NVS=y
CONFIG_SETTINGS=y

# Enable DK LED and Buttons library
CONFIG_DK_LIBRARY=y

# This example requires more workqueue stack
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

# Config logger
CONFIG_LOG=y
CONFIG_LOG2_MODE_IMMEDIATE=y
CONFIG_LOG_BACKEND_UART=y

CONFIG_ASSERT=y

CONFIG_BT_USER_DATA_LEN_UPDATE=y
CONFIG_BT_USER_PHY_UPDATE=y

CONFIG_BT_BUF_ACL_RX_SIZE=251
CONFIG_BT_GATT_CLIENT=y
CONFIG_BT_ATT_PREPARE_COUNT=2
CONFIG_BT_L2CAP_TX_MTU=247
CONFIG_BT_BUF_ACL_TX_COUNT=10
CONFIG_BT_BUF_ACL_TX_SIZE=251

Still, the speed has not accelerated at all.

My project is attached here.

devzone.nordicsemi.com/.../3513.peripheral_5F00_uart.zip

RE: NUS send very slow.

Vidar Berg — Tue, 04 Oct 2022 08:08:29 GMT

Hello,

To maximize throughput, you need to change the default Bluetooth controller settings on the network core (i.e. kconfig settings for hci_rpmsg). And to change those configurations, you have to include the configuration file I provided.

Configurations settings for hci_rpmsg to support 251 byte Radio packets:

- CONFIG_BT_BUF_ACL_TX_SIZE=251

- CONFIG_BT_BUF_ACL_RX_SIZE=251

- CONFIG_BT_CTLR_DATA_LENGTH_MAX=251

And the configurations from your current build (copied from the .config file in your build/hci_rpmsg/zephyr folder):

CONFIG_BT_CTLR_LE_ENC=y
CONFIG_BT_CTLR_EXT_REJ_IND=y
CONFIG_BT_CTLR_LE_PING=y
CONFIG_BT_CTLR_DATA_LENGTH=y
CONFIG_BT_CTLR_DATA_LENGTH_MAX=27
CONFIG_BT_CTLR_PHY=y
CONFIG_BT_CTLR_CONN_RSSI=y
CONFIG_BT_CTLR_CHECK_SAME_PEER_CONN=y
CONFIG_BT_CTLR_FILTER_ACCEPT_LIST=y
CONFIG_BT_CTLR_PRIVACY=y
CONFIG_BT_CTLR_FAL_SIZE=8
CONFIG_BT_CTLR_RL_SIZE=8
CONFIG_BT_CTLR_EXT_SCAN_FP=y
CONFIG_BT_CTLR_PHY_2M=y
CONFIG_BT_CTLR_PHY_CODED=y
CONFIG_BT_CTLR_CHAN_SEL_2=y

CONFIG_BT_BUF_ACL_TX_SIZE=27
CONFIG_BT_BUF_ACL_TX_COUNT=7
CONFIG_BT_BUF_ACL_RX_SIZE=27
CONFIG_BT_BUF_ACL_RX_COUNT=6

RE: NUS send very slow.

ell_pass — Tue, 04 Oct 2022 07:08:47 GMT

Hello，

Let me tell this story from the beginning. We tried to use nrf5340 to achieve high-speed transceiver function, but the speed has been very slow, only up to 2kbps. We tried to modify the relevant configuration (Kconfig, prj, boards) in our program according to the official sample.I noticed that my program is missing a file（as in the conversation above）, so I think this may be affecting the speed.But in the end, I failed.

The program is attached here.

/cfs-file/__key/communityserver-discussions-components-files/4/4762.peripheral_5F00_uart.zip

I hope to get your help, thanks a lot !

RE: NUS send very slow.

Vidar Berg — Mon, 03 Oct 2022 06:02:46 GMT

Hello,

I'm not sure I understand what happened. A pristine build is like a clean build and it should not alter source files or project configurations.

Can you show a screenshot of what changed in your project after the pristine build?

RE: NUS send very slow.

ell_pass — Mon, 03 Oct 2022 04:35:03 GMT

Hello,

The pristine build works well.But I found that the original bluetooth sending and receiving function of my program was gone, after I copied that file to my project and did a pristine build.

RE: NUS send very slow.

Vidar Berg — Fri, 30 Sep 2022 12:41:56 GMT

Hello,

Have you tried to do a pristine build too? This should ensure that the change gets picked up by the build system.

RE: NUS send very slow.

ell_pass — Fri, 30 Sep 2022 09:30:53 GMT

Hello,

I did follow this(child_image->hci_rpmsg->boards). But when I paste "nrf5340dk_nrf5340_cpunet" in /boards, it still doesn't work. According to you, should I still do something after copying this file to make it work? Sorry, I don't quite understand the meaning in that URL.

RE: NUS send very slow.

Vidar Berg — Thu, 29 Sep 2022 13:54:47 GMT

Hello,

The file contain configuration settings which will override the default ones for the HCI RPMsg (architecture) child image.

[quote user="ell_pass"]I don't know what role this missing file plays in the whole project. I tried to paste this file into my project, but it doesn't work.[/quote]

Did you keep the same folder structure (child_image->hci_rpmsg->boards)?

How it settings are applied to child images: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_multi_image.html#image-specific-variables

RE: NUS send very slow.

ell_pass — Thu, 29 Sep 2022 11:13:56 GMT

Hello,

The sample you provided do get faster transfer speeds. But what confuses me is that there is a document missing in my project. As shown in the figure below.

I don't know what role this missing file plays in the whole project. I tried to paste this file into my project, but it doesn't work.

Looking for your help,thanks!

RE: NUS send very slow.

Vidar Berg — Tue, 27 Sep 2022 08:58:28 GMT

Hello,

Please try the attached sample and see if you get better results. Notice I have added the CONFIG_BT_CTLR_* settings to the hci_rpmsg child image in /child_image/hci_rpmsg/boards.

devzone.nordicsemi.com/.../0285.peripheral_5F00_uart_5F00_throughput_5F00_test.zip

Best regards,

Vidar