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BlueNRG-1 peripheral driver examples

UM2071

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BlueNRG-1 peripheral driver examples

The BlueNRG-1 peripheral driver examples applications are supported by the BlueNRG-1

development platform (STEVAL-IDB007V1). The kit contains a set of examples

demonstrating how to use the BlueNRG-1 device peripheral drivers ADC, GPIOs, I²C, RTC,

SPI, Timers, UART and WDG.

15.1

ADC examples

ADC polling: conversion is managed through the polling of the status register. The systick

timer is used to have a delay of 100 ms between two samples. Each sample from ADC is

printed through UART (USB-to-SERIAL must be connected to the PC). The default input is

the differential ADC1-ADC2.

ADC DMA: conversion is managed through the ADC DMA channel. The systick timer is

used to have a delay of 100 ms between two samples. Each sample from ADC is printed

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

ADC PDM: this example shows a PDM stream processor from a MEMS microphone

(MP34DT01-M i.e.) to UART. The application also supports the MEMS microphone

MP34DT01-M available on X-NUCLEO-CCA02MM1 board (refer to related BlueNRG-1 DK

SW package ADC PDM doxygen documentation for HW connections setup).

User is requested to connect the BlueNRG-1 STEVAL-IDB007V1 to a PC USB port and

open PuTTY serial terminal [512000, 8-N-1-N]. PuTTY serial terminal has to be configured

for storing the captured data on a log file. After the data have been captured, the PC

Audacity tool can been opened for importing the streamed data, following these steps:



File/Import/Raw Data.



Open the log data.



Configure as follows:



Encoding: Signed 16-bit PCM.



Byte order: Little-endian.



Channels: 1 Channel (Mono).



Sample rate: 8000 (default, 16 kbps is supported by changing the firmware

symbol FS in ADC_PDM_main.c)



Press the button Import.



Play the audio.

Due to the fact that the output data format is 2-bytes (B1B2), it is possible that

the serial terminal gets as first byte, half data (B2). This first byte must be

removed from the log file.

15.2

GPIO examples

Input interrupt: demonstrates the use of GPIO input interrupts.



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

of the input signal. LED DL1 is toggled ON if the level is high and OFF if low.



The PUSH2 button (IO5) is configured to generate the interrupt event on the rising

edge of the input signal. LED DL2 is toggled ON/OFF at each rising edge event.

IO toggle: demonstrates GPIO state changes by toggling LEDs DL1 and DL2 every 500

ms.

IO wakeup: demonstrates device wakeup from standby mode using the GPIO interrupt.

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