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UM2071

BlueNRG-1 peripheral driver examples

DocID029370 Rev 3

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

The PUSH1 button (IO13) is configured to generate the interrupt event on both edges

of the input signal. LED DL2 is toggled, the system becomes active and LED DL1 is

toggled by the systick interrupt service routine every 500 ms.

Once the device is in standby, there is no way to open a connection with the debug tool or

download new code as the clocks are down and the system voltages are at their minimum

values. It is necessary to wake-up the system first, which is why the IO9 (SDW clock

signal) is wake-up event. In this case, any connection attempt from the debugger wakes up

the system.

15.3

I²C examples

In all of the following examples, I²C is configured in master mode and its clock frequency is

set to 10 kHz.

Master polling: I²C communication is controlled by polling the I²C status register content.

This example involves a master board with Master_Polling firmware code and a slave

board with Slave_Polling firmware.

The Master board has a small command line interface through UART (USB-to-SERIAL

must be connected to the PC), which you can use to read and change the LED status of

the slave board. I²C is used to transfer the information and change the status of the LEDs

on the slave board.

Slave polling: I²C communication is controlled by polling the I²C status register content.

This also involves a master and a slave board with respective Master_Polling and

Slave_Polling firmware. The slave board receives read and change requests for the LEDs

via I²C.

Master sensor: I²C communication is controlled by polling of I²C status register content,

interrupts or DMA (three different configurations). In this example, the environmental

sensor LPS25HB is configured to provide output data at 1 Hz. The BlueNRG-1 polls the

status register of the sensor and prints available pressure and temperature data via UART

(USB-to-SERIAL must be connected to the PC).

15.4

Micro examples

Hello world

: example for the basic ‘BlueNRG-1 Hello World’ application. Connect the

BlueNRG-1 platform to a PC USB port and open a specific PC tool/program (like Tera

Term): the "Hello World: BlueNRG-1 is here!" message is displayed.

Sleep test: this test provides an example for the following BlueNRG-1 sleep modes:



SLEEPMODE_WAKETIMER places the BlueNRG-1 in deep sleep with the timer clock

sources running. The wakeup sources are typing any character on the keyboard, the

PUSH1 button or the sleep timer configured with a timeout of 5 s.



The SLEEPMODE_NOTIMER places the BlurNRG-1 in deep sleep with the sleep

timer clock sources turned off. The only wakeup sources are typing any character on

the keyboard and the PUSH1 button.

The demo supports some user commands:



s: SLEEPMODE_NOTIMER - wake on UART/PUSH1



t: SLEEPMODE_WAKETIMER - wake on UART/timeout 5 s/PUSH1



l: Toggle led DL1



: Print the ‘Hello World’ message



r: Reset the BlueNRG-1 device



?: Display this help menu



PUSH1: toggle LED DL1

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