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I2C_Master_w_Sensor_main.c File Reference

This code provides an example how to configure and to use the I2C master communicating with an environmental sensor. More...

`#include "BlueNRG1.h"`
`#include <stdio.h>`
`#include "BlueNRG1_conf.h"`
`#include "SDK_EVAL_Config.h"`
`#include "LPS25HB_hal.h"`

Go to the source code of this file.

## Macros

#define | SYST_CLOCK 16000000

## Functions

void | SdkDelayMs (volatile uint32_t lTimeMs)
| Delay function. More...
int | main (void)
| Main program code. More...

## Variables

volatile uint32_t | lSystickCounter =0

## Detailed Description

This code provides an example how to configure and to use the I2C master communicating with an environmental sensor.

# ATOLLIC project

To use the project with ATOLLIC TrueSTUDIO for ARM, please follow the instructions below:

1. Open the ATOLLIC TrueSTUDIO for ARM and select File->Import... Project menu.
2. Select Existing Projects into Workspace.
3. Select the ATOLLIC project
4. Select desired configuration to build from Project->Manage Configurations
5. Select Project->Rebuild Project. This will recompile and link the entire application
6. To download the binary image, please connect STLink to JTAG connector in your board (if available).
7. Select Project->Download to download the related binary image.
8. Alternatively, open the BlueNRG1 GUI, put the board in bootloader mode and download the built binary image.

# KEIL project

To use the project with KEIL uVision 5 for ARM, please follow the instructions below:

1. Open the KEIL uVision 5 for ARM and select Project->Open Project menu.
2. Open the KEIL project `...\Project\BlueNRG1_Periph_Examples\I2C\Master_w_Sensor\MDK-ARM\Master_w_Sensor.uvprojx`
3. Select desired configuration to build
4. Select Project->Rebuild all target files. This will recompile and link the entire application
5. To download the binary image, please connect STLink to JTAG connector in your board (if available).
6. Select Project->Download to download the related binary image.
7. Alternatively, open the BlueNRG1 GUI, put the board in bootloader mode and download the built binary image.

# IAR project

To use the project with IAR Embedded Workbench for ARM, please follow the instructions below:

1. Open the Embedded Workbench for ARM and select File->Open->Workspace menu.
2. Open the IAR project `...\Project\BlueNRG1_Periph_Examples\I2C\Master_w_Sensor\EWARM\Master_w_Sensor.eww`
3. Select desired configuration to build
4. Select Project->Rebuild All. This will recompile and link the entire application
5. To download the binary image, please connect STLink to JTAG connector in your board (if available).
6. Select Project->Download and Debug to download the related binary image.
7. Alternatively, open the BlueNRG1 GUI, put the board in bootloader mode and download the built binary image.

## Project configurations

- `Dma` - The I2C is used through the DMA channel I2C TX and I2C RX
- `Interrupt` - The I2C is used through the I2C interrupt service routine
- `Polling` - The I2C is used in polling mode on status registers

# Boards supported

- `STEVAL-IDB007V1`

# Power configuration settings

STEVAL-IDB007V1
Jumper name |  | Description
JP1 | JP2 |
ON 1-2 | ON 2-3 | USB supply power
ON 2-3 | ON 1-2 | The supply voltage must be provided through battery pins.
ON 1-2 |  | USB supply power to STM32L1, JP2 pin 2 external power to BlueNRG1

# Jumper settings

STEVAL-IDB007V1
Jumper name | Description
JP1 | 1-2: to provide power from USB (JP2:2-3). 2-3: to provide power from battery holder (JP2:1-2)
JP2 | 1-2: to provide power from battery holder (JP1:2-3). 2-3: to provide power from USB (JP1:1-2). Pin2 to VDD to provide external power supply to BlueNRG-1 (JP1: 1-2)
JP3 | pin 1 and 2 UART RX and TX of MCU. pin 3 GND.
JP4 | Fitted: to provide VBLUE to BlueNRG1. It can be used also for current measurement.
JP5 | Fitted : TEST pin to VBLUE. Not fitted: TEST pin to GND

# Pin settings

| Interrupt | Dma | Polling
PIN name | STEVAL-IDB007V1 | STEVAL-IDB007V1 | STEVAL-IDB007V1
ADC1 | Not Used | Not Used | Not Used
ADC2 | Not Used | Not Used | Not Used
IO0 | Not Used | Not Used | Not Used
IO1 | Not Used | Not Used | Not Used
IO11 | UART RX pin | UART RX pin | UART RX pin
IO12 | Not Used | Not Used | Not Used
IO13 | Not Used | Not Used | Not Used
IO14 | Not Used | Not Used | Not Used
IO2 | Not Used | Not Used | Not Used
IO3 | Not Used | Not Used | Not Used
IO4 | I2C clock pin | I2C clock pin | I2C clock pin
IO5 | I2C data pin | I2C data pin | I2C data pin
IO6 | Not Used | Not Used | Not Used
IO7 | Not Used | Not Used | Not Used
IO8 | UART TX pin | UART TX pin | UART TX pin
TEST1 | Not Used | Not Used | Not Used

# Serial I/O

The application will listen for keys typed and it will send back in the serial port. In other words everything typed in serial port will be send back.

Parameter name | Value | Unit
Baudrate | 115200 [default] | bit/sec
Data bits | 8 | bit
Parity | None | bit
Stop bits | 1 | bit

# LEDs description

| Interrupt | Dma | Polling
LED name | STEVAL-IDB007V1 | STEVAL-IDB007V1 | STEVAL-IDB007V1
DL1 | Not Used | Not Used | Not Used
DL2 | Not Used | Not Used | Not Used
DL3 | Not Used | Not Used | Not Used
DL4 | Power | Power | Power

# Buttons description

| Interrupt | Dma | Polling
BUTTON name | STEVAL-IDB007V1 | STEVAL-IDB007V1 | STEVAL-IDB007V1
PUSH1 | Not Used | Not Used | Not Used
PUSH2 | Not Used | Not Used | Not Used
RESET | Reset BlueNRG1 | Reset BlueNRG1 | Reset BlueNRG1

# Usage

The I2C controller is an interface designed to support the physical and data link layer according to the I2C standard revision 3.0 (June 2007). The I2C bus is a 2-wire serial bus that provides a low-cost interconnection between ICs.

This example provides a simple application where the I2C communication is controlled by polling of the I2C status register content, interrupts or DMA (3 different configurations).

In this example, the environmental sensor LPS25HB is configured to provide output data with 1 Hz rate. The BlueNRG1 is polling the status register of the sensor and each time the data is available, pressure and temperature data are readout from the sensor and then printed through UART (USB-to-SERIAL must be connected to the PC).

The I2C is configured in the master mode. The I2C clock frequency is set to 10kHz.

Definition in file I2C_Master_w_Sensor_main.c.