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10 changes: 10 additions & 0 deletions CHANGES.txt
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--------------------
PRDC_i2cScannerSTM32
Simple I2C scanner for STM32 based boards using Arduino and Arduino_Core_STM32.
--------------------

Release 1.0.0, 29.12.2021.

- Initial release

--------------------
165 changes: 165 additions & 0 deletions LICENSE
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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007

Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.


This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.

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93 changes: 93 additions & 0 deletions PRDC_i2cScannerSTM32.ino
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/**
* PRDC_i2cScannerSTM32.ino - I2C Scanner for Arduino_Core_STM32
* Author: Milos Petrasinovic <mpetrasinovic@pr-dc.com>
* PR-DC, Republic of Serbia
* info@pr-dc.com
*
* --------------------
* Copyright (C) 2021 PR-DC <info@pr-dc.com>
*
* This file is part of PRDC_i2cScannerSTM32.
*
* PRDC_i2cScannerSTM32 is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* PRDC_i2cScannerSTM32 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with PRDC_i2cScannerSTM32. If not, see <https://www.gnu.org/licenses/>.
*
*/

// Library
// --------------------
#include <Wire.h>

// Define I2C pins
// --------------------
#define I2C_SDA PB7 // I2C SDA pin
#define I2C_SCL PB6 // I2C SCL pin

// I2C Instance
// --------------------
TwoWire I2C_COM(I2C_SDA, I2C_SCL); // I2C instance

// setup function
// --------------------
void setup() {
// Begin comunication with custom I2C istance
I2C_COM.begin();

// Begin serial communication
Serial.begin(115200);
while(!Serial);
Serial.println("I2C Scanner for STM32 based boards");
}


// loop function
// --------------------
void loop(){
uint8_t error, address;
uint8_t num_devices;

Serial.println("Scanning...");

num_devices = 0;
for(address = 1; address < 127; address++) {
// The i2c_scanner uses the return value of
// the Write.endTransmisstion to see if
// a device did acknowledge to the address.
I2C_COM.beginTransmission(address);
error = I2C_COM.endTransmission();

if(error == 0) {
Serial.print("I2C device found at address 0x");
if(address < 16) {
Serial.print("0");
}
Serial.print(address, HEX);
Serial.println("!");
num_devices++;
} else if(error == 4) {
Serial.print("Unknown error at address 0x");
if(address < 16) {
Serial.print("0");
}
Serial.println(address, HEX);
}
}

Serial.println("Scanning done...");
if(num_devices == 0) {
Serial.println("No I2C devices found");
}
Serial.println();

delay(1000); // wait one second before next scan
}
30 changes: 30 additions & 0 deletions README.md
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# PR-DC I2C Scanner for Arduino_Core_STM32

Simple I2C scanner for STM32 based boards using Arduino and Arduino_Core_STM32.

## Requirements
[Arduino](https://www.arduino.cc/)<br>
[Arduino_Core_STM32](https://github.com/stm32duino/Arduino_Core_STM32)<br>

This library is tested with
**Arduino IDE 1.8.16** and **Arduino_Core_STM32 2.1.0**.

## Usage

Compile and run the program using Arduino and Arduino_Core_STM32 for STM32 based board. Connect to board using USB and open Serial Monitor to see program output.

## License
Copyright (C) 2021 PR-DC <info@pr-dc.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.

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