Data exchange through UART

RE: Data exchange through UART

David Edwin — Fri, 29 Nov 2013 11:19:23 GMT

Please raise a support request with PIC support as microchip has ports of the nRF8001 SDK for PIC processors. Unfortunately I do not have further information than that. You can port the Bluetooth low energy SDK for Arduino to the PIC without too much work. The Bluetooth low energy SDK for Arduino (as of 29 Nov 2013) requires about 400 to 600 bytes of RAM and this can be further optimized so this should easily fit in the PIC18F.

RE: Data exchange through UART

sudha — Fri, 29 Nov 2013 07:12:05 GMT

hi ,,

my new project is nrf 2739 module and nrf 8001 (Bluetooth communication ) , i have no idea , how to communicate this module ... i have interface with pic 18f45k22 and nrf 2740 module ... i will interface in nrf 2739 module with pc ... any idea pls help me

RE: Data exchange through UART

Mihail — Thu, 05 Sep 2013 06:20:48 GMT

Yes, I get it often. And yes, I have long wire. I will try reduce lengths.

RE: Data exchange through UART

TIE Fighter — Thu, 05 Sep 2013 04:38:16 GMT

You can look at the nRF8001 datasheet and interpret the ACI commands and ACI Events. The datasheet is here http://www.nordicsemi.com/eng/Products/Bluetooth-R-low-energy/nRF8001 click on the pdf icon on the right. Sections 24, 25, 26 and 27 have the ACI Commands and Events

C is ACI Command E is ACI Event

C4 means an ACI Command with the length of the packet as 4 bytes. All printing is in hex and can be looked up against the datasheet.

It looks like a ACI command with opcode 0 was sent, which got an error response from the nRF8001. Do you get this often ? Can you put the lib_aci_debug_print(false); and check if you still get the issue. Check your wire lengths and make them shorter.

RE: Data exchange through UART

Mihail — Wed, 04 Sep 2013 16:23:33 GMT

Where I can find information how to decipher it ? And why I recieved " Evt Cmd respone: Error. Arduino is in an while(1); loop" ?


Arduino setup
 E4 :4, 81, 2, 0, 2, 
Evt Device Started: Setup
C7 :7, 6, 0, 0, 3, 2, 41, D7, 
C31 :1F, 6, 10, 0, 0, 0, 0, 0, 0, 0, 4, 0, 4, 1, 1, 0, 0, 6, 0, 0, 90, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
C31 :1F, 6, 10, 1C, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 14, 0, 0, 0, 14, 3, 90, 1, 64, 
C31 :1F, 6, 10, 38, 2, FF, 2, 58, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
C5 :5, 6, 10, 54, 0, 0, 
C31 :1F, 6, 20, 0, 4, 4, 2, 2, 0, 1, 28, 0, 1, 0, 18, 4, 4, 5, 5, 0, 2, 28, 3, 1, E, 3, 0, 0, 2A, 4, 14, 7, 
C31 :1F, 6, 20, 1C, 4, 0, 3, 2A, 0, 1, 55, 41, 52, 54, 69, 63, 73, 4, 4, 5, 5, 0, 4, 28, 3, 1, 2, 5, 0, 1, 2A, 6, 
C31 :1F, 6, 20, 38, 4, 3, 2, 0, 5, 2A, 1, 1, 0, 0, 4, 4, 5, 5, 0, 6, 28, 3, 1, 2, 7, 0, 4, 2A, 6, 4, 9, 8, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
C31 :1F, 6, 20, 54, 0, 7, 2A, 4, 1, 6, 0, 12, 0, 0, 0, A, 0, 4, 4, 2, 2, 0, 8, 28, 0, 1, 1, 18, 4, 4, 10, 10, 
C31 :1F, 6, 20, 70, 0, 9, 28, 0, 1, 9E, CA, DC, 24, E, E5, A9, E0, 93, F3, A3, B5, 1, 0, 40, 6E, 4, 4, 13, 13, 0, A, 28, 
C31 :1F, 6, 20, 8C, 3, 1, 4, B, 0, 9E, CA, DC, 24, E, E5, A9, E0, 93, F3, A3, B5, 2, 0, 40, 6E, 44, 10, 14, 0, 0, B, 0, 
C31 :1F, 6, 20, A8, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 13, 13, 0, C, 
C31 :1F, 6, 20, C4, 28, 3, 1, 10, D, 0, 9E, CA, DC, 24, E, E5, A9, E0, 93, F3, A3, B5, 3, 0, 40, 6E, 14, 0, 14, 0, 0, D, 
C31 :1F, 6, 20, E0, 0, 3, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 46, 14, 3, 2, 0, 
C31 :1F, 6, 20, FC, E, 29, 2, 1, 0, 0, 4, 4, 2, 2, 0, F, 28, 0, 1, A, 18, 4, 4, 5, 5, 0, 10, 28, 3, 1, 2, 11, 
C25 :19, 6, 21, 18, 0, 27, 2A, 4, 4, 9, 1, 0, 11, 2A, 27, 1, A, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
C31 :1F, 6, 40, 0, 2A, 0, 1, 0, 80, 4, 0, 3, 0, 0, 0, 2, 2, 0, 8, 4, 0, B, 0, 0, 0, 3, 2, 0, 2, 4, 0, D, 
C15 :F, 6, 40, 1C, 0, E, 2A, 27, 1, 0, 80, 4, 0, 11, 0, 0, 
C19 :13, 6, 50, 0, 9E, CA, DC, 24, E, E5, A9, E0, 93, F3, A3, B5, 0, 0, 40, 6E, 
C15 :F, 6, 60, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
C6 :6, 6, F0, 0, 3, D3, 88, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 1, 
 E3 :3, 84, 6, 2, 
 E4 :4, 81, 3, 0, 2, 
Evt Device Started: Standby
C5 :5, F, B4, 0, 50, 0, 
Advertising started
 E3 :3, 84, F, 0, 
 E15 :F, 85, 1, 2, D8, 98, CB, 7A, 63, 10, 0, 0, 0, 2C, 1, 1, 
Evt Connected
C1 :1, 9, 
 E17 :11, 88, 17, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
Evt Pipe Status
 E12 :C, 84, 9, 0, 15, 0, 2, 3, 0, 0, 0, 0, 0, 
C11 :B, D, 4, 15, 0, 2, 3, 0, 0, 0, 0, 0, 
 E3 :3, 84, D, 0, 
 E17 :11, 88, 1F, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
Evt Pipe Status
C1 :1, 13, 
 E3 :3, 84, 13, 0, 
 E7 :7, 89, 6, 0, 0, 0, A, 0, 
Evt link connection interval changed
 E5 :5, 8C, 2, 34, 34, 35, 
UART RX: 0x2 Data(Hex) : 4 4 5 
Sending: 223

C6 :6, 15, 3, 32, 32, 33, A, 
 E2 :2, 8A, 1, 
Sending: 44455

C8 :8, 15, 3, 34, 34, 34, 35, 35, A, 
 E2 :2, 8A, 1, 
Sending: 4

C4 :4, 15, 3, 34, A, 
 E2 :2, 8A, 1, 
 E3 :3, 84, 0, 82, 
ACI Command 0
Evt Cmd respone: Error. Arduino is in an while(1); loop

RE: Data exchange through UART

Mihail — Wed, 04 Sep 2013 16:14:53 GMT

Nice. Thank you very much. I am happy. I was not inattentive to "\n". I choose "newline" in the bottom of SM and it works. :))))))))))

RE: Data exchange through UART

TIE Fighter — Wed, 04 Sep 2013 12:01:59 GMT

Agreed.

RE: Data exchange through UART

TIE Fighter — Wed, 04 Sep 2013 12:01:31 GMT

I am able to get it running perfectly even at 19200 baud. I am looking for the "Newline" in the string that the SM sends to the Arduino so Newline should also be on in the SM. I am also attaching the BLE library that I am using as a zip file, that works with the sketch that I attached earlier. Use the BLE library I am sending with the sketch.

Can you also turn on debug printing in your sketch and send me the traces that you see.

//We reset the nRF8001 here by toggling the RESET line connected to the nRF8001 //and initialize the data structures required to setup the nRF8001 lib_aci_init(&aci_state);

//Turn debug printing on for the ACI messages lib_aci_debug_print(true);

This will print all the ACI commands and events that are sent to the nRF8001.

BLE_4-Sep-2013.zip

RE: Data exchange through UART

Mihail — Wed, 04 Sep 2013 09:43:04 GMT

I know it. I think if i have not right connection I can't detect device and transfer data to the one derection (from the MPC to the SM) but I can do it.

PIN3 -> RDYN PIN4 -> RESET PIN5 -> ACTIVE

PIN10 -> REQN/SS PIN11 -> MOSI PIN12 -> MISO PIN13 -> SCK

3.3V -> VCC_nRF GND -> GND

On the nRF2740 board the connectors are 1 - GND 2 - VCC_nRF 3 - ACTIVE 4 - Not in use 5 - SCK 6 - MOSI 7 - MISO 8 - RDYN 9 - REQN 10- RESET

RE: Data exchange through UART

TIE Fighter — Wed, 04 Sep 2013 09:03:02 GMT

Can you also list the connections you are using between the nRF2740 and the UNO.

RE: Data exchange through UART

TIE Fighter — Wed, 04 Sep 2013 08:56:13 GMT

The original sketch does not have the ability to send data from the SM to the MCP. You need to get my new sketch running.

RE: Data exchange through UART

Mihail — Wed, 04 Sep 2013 08:18:54 GMT

Unfortunately but no. I have not missed this step. Ok I will create video :)

RE: Data exchange through UART

TIE Fighter — Wed, 04 Sep 2013 07:09:17 GMT

Ok.

Let me give a more detailed set of steps on the master control panel

Master Control panel: Start Discovery -> Select "UART" -> Click button Select Device Click button Service Discovery, wait until Service Discovery is finished (buttons are disabled until Service Discovery is finished) Click button "Enable Services"

Now you should be able to send data from SM to MCP.

Please send me your feedback after testing these steps. I think you are missing the step of "Service Discovery".

RE: Data exchange through UART

Mihail — Wed, 04 Sep 2013 06:58:10 GMT

Ok, I will describe situation. I connect nRF2739 to desktop PC with running Master Control Panel (MCP, v.3.4.0.8098). I connect nRF2740 (nRF8001) to Arduino Uno which is connected to notebook with running Serial Monitor (SM) of Arduino. I choose baud rate of 19200 for stability in SM and changed it in sketch. I have discovered nRF8001 in MCP and enabled services. Via UART RX in MCP I send "Hello" for example and recieved it in SM but when I sent "hello" from SM I didn't recieved any changes in MCP. What I have to do to transfer data from SM to MCP? And I don't know why but original ble_uart_project_template more stable in my system. I can use this sketch with MCP v.3.1.0.7793 but with your sketch I am not able to connect to device even.

RE: Data exchange through UART

TIE Fighter — Tue, 03 Sep 2013 12:32:17 GMT

I am also using the UART over BLE Service with the UART RX and UART TX Characteristics. You do not have to change any Service or Characteristic. Take the edits that I have done on the ino file that I have attached.

I have tested it with Master Control Panel 3.4.0 and it works well.

When you are using it with Master Control Panel, remember to click "Enable Services", this will subscribe the Master Control Panel to the Notifications. Now you should be able to send data from the SM to the Master Control Panel as well.

RE: Data exchange through UART

Mihail — Sun, 01 Sep 2013 15:39:14 GMT

I am sorry. I was not logged in. Perhaps the reason is that we have to change anything in the profile. Currently I have service named UART over BLE with Characteristics UART Rx with properties WriteWithoutResponse and UART Tx with properties Notify. How I have to change Characteristics to realise your sketch?

RE: Data exchange through UART

Guest — Sun, 01 Sep 2013 15:27:28 GMT

Thank you. I have tried send data from Serial Monitor (SM) of Arduino to Master Emulate (ME) and not seen any changes in UART Tx and UART Rx, but I still can send data from ME to SM.

RE: Data exchange through UART

Bastiaan — Sun, 01 Sep 2013 15:27:28 GMT

Thank you. I have tried send data from Serial Monitor (SM) of Arduino to Master Emulate (ME) and not seen any changes in UART Tx and UART Rx, but I still can send data from ME to SM.

RE: Data exchange through UART

TIE Fighter — Wed, 28 Aug 2013 07:21:48 GMT

I have modified the ble_uart_project_template sketch to allow the serial monitor of the Arduino to send data from the PC. Set the baud rate to 115200 with Newline. I use the "newline" character '\n' to detect the length of the string before sending it to nRF UART app.

The modified sketch is attached.

Note: The ble_uart_project_modify_setup project is used as an example to recalculate the CRC for a Setup that was manually modifed. The recalculated CRC can then be put into the header file so the Setup can be successfully sent to the nRF8001.

ble_uart_project_template.ino