OL2385SWUG datasheet(22/64 Pages) NXP

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NXP Semiconductors

OL2385SWUG

SIGFOX software driver

OL2385SWUG

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User guide

Rev. 2.1 — 6 April 2018

22 / 64

the board. There is no external MCU required, thereby saving the customer additional

cost. Because each application from customer to customer is different, this version

will be provided as a skeleton with a combined library (NXP radio plus SIGFOX stack).

The customer can modify the skeleton for customizing the behavior of the buttons

and LEDs. A basic version of the software exists and can be enabled by a macro

(BUTTON_PRESS_MODE) in project settings. The creation of a combined library

still has to be done, therefore it is not ready to be provided. Additionally, the program

memory does not have a lot of space and therefore, the application has to be very

small and simple.

• UART based firmware (under investigation): This version needs a UART interface

to the OL2385. This interface can also be to an external MCU or to a terminal program.

From a business point of view, it makes sense to not have an external MCU required,

thus saving the customer additional cost. A basic version of the software exists and

can be enabled by a macro in project settings (SIGFOX_UART_MODE). However, the

driver for UART is not robust and needs to be rewritten completely. The AT commands

need to be updated and bugs have to be fixed.

Note: A SIGFOX based module might go through a P1 certification process at

SIGFOX, depending on if there is a hardware change from an NXP reference design

or modification of certified NXP software. NXP has only standard product – SPI based

firmware certified at SIGFOX for all regions. Even if the radio parts of the software

remain unchanged, any small change in software will still be considered a change. And

therefore, if a customer decides to use Button press based or UART based firmware,

they will have to get their devices recertified. In order to do the certification, SIGFOX

will require activation of various test sequences on the OL2385 device. This will be

very difficult for Button press based firmware, because OL2385 has only three buttons.

Therefore, a SPI or UART based interface to OL2385, where we can control these test

sequences, is needed.

Similarly, a UART based firmware without an MCU is good for evaluation using a terminal

program. But for end product, customers will use either an MCU to connect to UART

interface or use buttons again to write application on the device. In case of using an

external MCU, it is highly recommended to use SPI based firmware, because it is

certified and readily available. In case of no MCU usage and using buttons as a final

interface to the user, UART will just be used as a certification interface. Again, in such

a scenario it is easier to use a SPI based interface for certification purposes, because

button applications will vary from customer to customer. It will again be our strategy to

provide the code to customers with a combined library.

Proposed solution: For the applications where buttons are the interface to users and

an interface is required only for evaluation and certification, it makes sense to provide

the code to customers with a combined library and skeleton source files. A macro can be

used by customers to enable/disable the SPI interface, which then will be used for one

time certification. This means that customers do not have to use the MCU permanently

on all products, but only externally to get certification. Therefore, there is no need for

UART based firmware. Also, UART would have required an additional FTDI cable to

interface OL2385 for certification. Now, it will just be an MCU based device controlling

OL2385 externally for certification.

6.2 Kinetis MCU based application

This chapter is relevant for writing the code for an application on Kinetis MCUs. If your

KL43Z is preflashed, you can skip to Section 7.1 "Testing on SIGFOX Base Station".

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