SPI communication and BLE advertising data with nRF52 DK

[Ander GB]

Hi everyone!

I have already developed a couple projects in nRF52 DK and the result was quite messy. I want to make it right this time and that's why I am requesting your help.

I am using nRF52 DK and SDK 13.0.0. and Eclipse Mars 2 (C/C++) with the setup explained in this Devzone Tutorial.
My goal is to create a project starting from some examples, modifying and merging them. I intend to comunicate with a SPI peripheral and send the recieved data through BLE advertising mode (broadcast).

I have compiled and tested the SPI example and it works just fine. Now, I need to send that data over BLE advertising. The requirement is it to be sent at least 10 times every second.

I would be very grateful if you could guide me on this. Some pages that I should read, any example that broadcasts data over BLE, any question already answered on this topic (I have searched and I did not find that much), any help will be very welcome. I really want to learn how to use Nordic hardware but my previous experience has only been frustrating so far.

Thank you so much for your time!

AGB

[Ander GB]

Everytime that I create a new project i follow the steps of the Devzone Tutorial (Propierties > C/C++ General > Preprocessor Include paths, Macros, etc and change the CDT GCC Build Outparser and CDT GCC Built-in Compiler Settings Cross ARM). I am not an expert, so I may be wrong but I think that is for avoiding erros in includes, isn't it?

And yes, I have added the spi's includes to the main.c file of the ble_app_beacon.

[Ander GB]

I got rid of the problem with "undefined reference to 'nrf_drv_spi_init' " and "undefined reference to 'nrf_drv_spi_transfer' ". Turns out that I hadn't added the lines:

$(SDK_ROOT)/components/drivers_nrf/spi_master \

$(SDK_ROOT)/components/drivers_nrf/spi_master/nrf_drv_spi.c \

To the Makefile. Now it compiles perfectly, I just need to fill the advdata info with the readings from the spi and that should be it.

[Ander GB]

I am almost done. I fully integrated both projects together and now the readings are being send properly. I just have a few matters that I would like to solve:

The LOG is printing an ERROR:FATAL somewhere in my code. After debugging I found out that it is this:

err_code = sd_ble_gap_adv_start(&m_adv_params, BLE_CONN_CFG_TAG_DEFAULT);

In the debug I got err_code = 7, which according to the documentation is NRF_ERROR_INVALID_PARAM. My m_adv_params are:

m_adv_params.type        = BLE_GAP_ADV_TYPE_ADV_NONCONN_IND;
m_adv_params.p_peer_addr = NULL;
m_adv_params.fp          = BLE_GAP_ADV_FP_ANY;
m_adv_params.interval    = NON_CONNECTABLE_ADV_INTERVAL;
m_adv_params.timeout     = APP_CFG_NON_CONN_ADV_TIMEOUT;

They are the default ones of the ble_app_beacon example and they had no errors before.

Any idea?

[norin saiyed]

What do you mean by readings are send properly?? how you are sending your spi data??

Are you advertising it into beacon?

[Ander GB]

I send the m_rx_buf (sensor data) like this:

manuf_specific_data.data.p_data = (uint8_t *) m_rx_buf;

Yes, I am advertising them as a beacon in the Manufacturer Specific Data field. I am using nRF connect to check the content of the advertising packet and it actually is the sensor data. Thats was I was talking about when I said that they are being sent properly.

This is what I talked about. The LOG is registering som ERROR:FATAL issue.

I noticed a weird thing:

APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, NULL, 0, m_rx_buf, m_length));

NRF_LOG_FLUSH();

bsp_board_led_invert(BSP_BOARD_LED_0);

nrf_delay_ms(10);

advertising_init();
advertising_start();

When I change this delay to 5 instead of 10, I get this other "error":

Do you want me to post the whole main.c file? You will probably detect the mistakes very easy.