SPI (Master) Example for nRF52840DK running a Arduino badge for Honeywell pressure sensors (Part# SEK001)

[KCrawford]

I'd like to know of an example(s) for interfacing nRF52840DK board as a Master SPI to an Arduino badge (from Honeywell). I have the badge working with an Arduino Uno (Rev 3), so I know it works.

But to port it to Nordic, what library/interface would work best? I've looked at the SPIM Manager but I'm not sure that is the right direction.

I would need an example that includes the prj.conf, .yaml, *.dts, and *.overlay files as well. 

Thanks in advance for your help.

[KCrawford]

0410.blinky.zip

[Simon]

Thanks, I'll take a look at it today/tomorrow

[KCrawford]

Thanks Simpon. Your assistance is truly appreciated and invaluable.

[Simon]

Try changing the name of the overlay file from "nrf9160dk_nrf9160ns.overlay" to "nrf9160dk_nrf9160_ns.overlay". 

After I did that, built and flashed using the board name nrf9160dk_nrf9160_ns and connected the MISO and MOSI pins P0.12 and P0.11 together (this is a loopback sample sending messages to itself), I was able to make it work. This is the output I got from Putty:

*** Booting Zephyr OS build v2.6.99-ncs1-1  ***
SPIM Example
GPIO device: GPIO_0
SPI Device: SPI_1
SPI CSN 13, MISO 12, MOSI 11, CLK 10
TX sent: 0
RX recv: 0
TX sent: 1
RX recv: 1
TX sent: 2
RX recv: 2
TX sent: 3
RX recv: 3
TX sent: 4
RX recv: 4
TX sent: 5
RX recv: 5
TX sent: 6
RX recv: 6
TX sent: 7
RX recv: 7
TX sent: 8
RX recv: 8
TX sent: 9
RX recv: 9
TX sent: a
RX recv: a
TX sent: b
RX recv: b

Explanations:

The overlay file needs to have the same name as the board your're building with. With newer versions of NCS, nrf9160dk_nrf9160_ns is the correct name to build the nonsecure nrf9160. Even if you build using nrf9160dk_nrf9160ns , it will get renamed to nrf9160dk_nrf9160_ns.

I saw that you just added nrf9160dk_nrf9160ns.overlay to the file nrf9160dk_nrf9160.overlay but I was not able to get this to work. So if you need to build using nrf9160dk_nrf9160 (which is not possible for cellular samples, they need to be built as nonsecure (ns)), just copy the content directly into it from nrf9160dk_nrf9160ns.overlay.

Best regards,

Simon