nRF52840 Sensor Network with SPI Sensor

[Ekmekci]

Dear All,

I am working with nRF52840 product. According to my scenario i have 1central unit(master) and up to 19 peripheral unit(slave).

I downloaded SDK 15.3.0 ble_central and ble_pripheral examples. These examples are very very good. They are sending button and led situations.

In my project, i have SPI sensor at slaves. So, i should read Spi register value and send to the master. 

How i can add Spi reading in to the ble_peripheral example

Best regards,

[Simon]

If you want to merge SPI functions into the ble_peripheral example you'll have to do the following:

• Copy the example examples/ble_peripheral into the same folder with a new name, then open it and add the SPI related code
• The SPI functions you have added will have both header and source files associated with it and you have to make these files visible for the compiler
  • Add the paths to all the header files
  • Add the source (.c) files to Project Explorer
• Enable necessary peripherals and settings in the sdk_config.h file (look at the SPI examples to see what needs to be enabled)

Some cases about merging:

• https://devzone.nordicsemi.com/f/nordic-q-a/39199/cdc_acm-with-softdevice
• https://devzone.nordicsemi.com/f/nordic-q-a/39871/facing-an-error-while-initializing-nrf-crypto-library-and-ble-stack-together/155098#155098

If anything is unclear, or if you are struggling with any of the steps above please tell me and I will explain more thoroughly.

Best regards,

Simon

[Ekmekci]

Dear Simon,

First of all, thank for your quick help.

Let me explain my point to you.

There is one master, and one slave. 

In slave side i connected acceloremeter via SPI to nRF52840.

My point is just, get one register value from my acceloremeter and send to the master via BLE

I just want to learn which example code i need to use. 

Please show way to do it to me

[Nguyen Hoan Hoang]

This blog post shows you an easy way to achieve it. 

http://embeddedsoftdev.blogspot.com/2018/01/

[Ekmekci]

Actually,

Multilik central and peripheral example is OK for me.

But, all these examples just are sending button state and led state (1bit) 

I need to send data (variable, counter, etc) and when sended data in receiver side i should compare this data ( if (rec_data == "Hello World!")) 

[Simon]

If you want to transfer strings over a BLE connection, from a peripheral to a central, you have to set some parameters which you provide to sd_ble_gatts_hvx():

char my_array[] = "HEY";
uint16_t length = sizeof(my_array);
.
.
.

params.p_len  = &length;
params.p_data = my_array;  
sd_ble_gatts_hvx(p_our_service->conn_handle, &hvx_params);

On the central side, you will receive the data as ASCII number. In the case above, the central will receive 0x48 45 59. If you cast these hex values to a char's after receiving, you'll be able to read the string 

Best regards,

Simon