453-00172-K1 Development Kit

The Vela  IF820 DVK uses a RP2040 to provide UART com ports for the DVK.

You can check the version of RP2040 firmware using the following, which assumes you have Python and pyocd installed.

pyocd list -v -v -v

which should return the RP2040 firmware of all boards currently connected which should look something like this

PS C:\Python311> pyocd list -v -v -v

0000733 D Project directory: C:\Python311 [session]

0001190 D CMSIS-DAP v2 probe E6620CD64F488232: firmware version 1.3.0+1694472875, protocol version 2.1.1 [dap_access_cmsis_dap]

0001280 D CMSIS-DAP v2 probe E6625C05E767202F: firmware version 1.3.0+1694472875, protocol version 2.1.1 [dap_access_cmsis_dap]

0001358 D CMSIS-DAP v2 probe E6625C05E789602C: firmware version 1.3.0+1694472875, protocol version 2.1.1 [dap_access_cmsis_dap]

  #   Probe/Board                              Unique ID          Target

------------------------------------------------------------------------------

  0   Ezurio (formerly Laird Connectivity) DVK Probe CMSIS-DAP   E6620CD64F488232   ✔︎ cortex_m

      Ezurio                       Module

  1   Ezurio DVK Probe CMSIS-DAP   E6625C05E767202F   n/a

  2   Ezurio DVK Probe CMSIS-DAP   E6625C05E789602C   n/a

PS C:\Python311>

If the IF820 flasher GUI or CLI utility does not detect the IF820 DVK it may be that the RP2040 used for providing serial/debug ports on the Vela IF820 may need updating. 

Please contact a Laird FAE via support@lairdconnect.com for more details

To use UWTerminalX with the Vela IF820 it is recommended to use the following settings

• Tick DTR
• Untick BREAK
• Untick Localecho
• Untick linemode
• baud rate 115200
• parity none
• stop bits 1
• data bits 8
• handshaking none
• Terminal select  CR
• use UART 1

On booting the Vela IF820, if all is good you should see the EZ-Serial boot message something like this, note the @E indicates an event, in this case boot.

@E,0074,BOOT,E=01040808,S=03010000,P=0104,H=23,C=00,A=E0984030FB5D,F=EZ-Serial-CYBT_243053_02 V1.4.8.8 Jun  9 2023 10:03:25

To confirm two way communications send/type the following followed by carriage return

/ping

To which the module should respond with somthing like the following, note the @R indicates a response, in this case to the /ping command. The /PING,0000 indicates the command was successful

@R,001D,/PING,0000,R=0000007F,F=F218

No, the beacon and data rates can be different but at the time of writing there is no benefit from the two data rates being different. If in doubt set them to the same data rate,

The Vela IF820 exposes to UARTS.

• UART 0 also known as the HCI UART
• UART 1the EZ-Serial UART (115200,8N1 no flow control)

On booting a Vela IF820 loaded with EZ-Serial Firmware a boot message will be sent on UART 1 and will look something like this

@E,0074,BOOT,E=01040808,S=03010000,P=0104,H=23,C=00,A=E77BCEF68661,F=EZ-Serial-CYBT_243053_02 V1.4.8.8 Jun  9 2023 10:03:25

Firmware updates should be performed on UART 0

Firmware and flashing tools can be downloaded from https://github.com/LairdCP/Vela_IF820_Firmware/releases

The Vela IF820 is preloaded with EZ-Serial firmware which can be used in one of two modes

• Text API
• Binary API

Text mode API provides human readable commands that can be sent to the module over the UART, typically from a microcontroller or from a PC terminal program during development.

Commands take the form of short code, for example

• /rbt          will reboot the module
• /bti          will start a Bluetooth classic inquiry
• /s             will start a scan for BLE adverts

The text mode API is particularly useful when first using EZ-Serial.

The binary mode API may be a better choice for production devices due to having a simpler parset/generator for the UART host. Binary mode uses a fixed packet structure for every transaction. Each packet is made up of the following

• 4 byte header
• optional payload
• checksum byte

For example a command to get the GAP device name might look like this

C0 00 04 10 6D

and the response might look like this

C0 15 04 10 00 00 12 45 5A 2D 53 65 72 69 61 6C 20 31 41 3A 32 31 3A 44 33 A0 

The first four bytes are the header (command), the 00 00 represents success, the 12 45 5A 2D 53 65 72 69 61 6C 20 31 41 3A 32 31 3A 44 33 is the  returned name and the final byte is the checksum.

Yes, the Vela IF820 does support flow control but it is not enabled by default.

The default UART settings are

• 115200 baud
• 8 data bits
• no parity
• 1 stop bit
• no flow control

The UART settings can be changed using the system_set_uart_parameters command (stu)

The UART settings can be read using the system_get_uart_parameters command (gtu)

Does the Vela IF820 support more than one concurrent SPP connection when using EZ-Serial?

No, only a single SPP connection is supported with EZ-Serial. If multiple SPP connections are required, consider using Modus Toolbox.