From 54bc27d0bbeda88cf1dc0496a1147a50f74c1ef0 Mon Sep 17 00:00:00 2001 From: Testato Date: Fri, 10 Aug 2018 19:28:46 +0200 Subject: [PATCH 1/3] I2C Scanner examples Tested on Bluepill for all three I2c (TWI 1 - TWI 1 alternative pin - TWI 2) --- .../Wire/examples/i2c_scanner/i2c_scanner.ino | 89 +++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 libraries/Wire/examples/i2c_scanner/i2c_scanner.ino diff --git a/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino new file mode 100644 index 0000000000..bccea8dc39 --- /dev/null +++ b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino @@ -0,0 +1,89 @@ +// -------------------------------------- +// i2c_scanner +// +// Version 1 +// This program (or code that looks like it) +// can be found in many places. +// For example on the Arduino.cc forum. +// The original author is not know. +// Version 2, Juni 2012, Using Arduino 1.0.1 +// Adapted to be as simple as possible by Arduino.cc user Krodal +// Version 3, Feb 26 2013 +// V3 by louarnold +// Version 4, March 3, 2013, Using Arduino 1.0.3 +// by Arduino.cc user Krodal. +// Changes by louarnold removed. +// Scanning addresses changed from 0...127 to 1...119, +// according to the i2c scanner by Nick Gammon +// http://www.gammon.com.au/forum/?id=10896 +// Version 5, March 28, 2013 +// As version 4, but address scans now to 127. +// A sensor seems to use address 120. +// +// This sketch tests the standard 7-bit addresses +// Devices with higher bit address might not be seen properly. +// + + + +// Pinmap for Bluepill I2Cs (by Testato) +// +// I2C-1 standard pins: PB7(sda) PB6(scl) +// Use it by "Wire" without pin declaration +// +// I2C-1 alternative pins: PB9(sda) PB8(scl) +// TwoWire Wire_alt(PB9,PB8); +// +// I2C-2: PB9(sda) PB8(scl) +// TwoWire Wire2(PB11,PB10); + + + +#include + + +void setup() { + + Serial.begin(9600); + Wire.begin(); + Serial.println("\nI2C Scanner"); +} + + +void loop() { + byte error, address; + int nDevices; + + Serial.println("Scanning..."); + + nDevices = 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. + + Wire.beginTransmission(address); + error = Wire.endTransmission(); + + if (error == 0) { + Serial.print("I2C device found at address 0x"); + if (address < 16) + Serial.print("0"); + Serial.println(address, HEX); + + nDevices++; + } + else if (error == 4) { + Serial.print("Unknown error at address 0x"); + if (address < 16) + Serial.print("0"); + Serial.println(address, HEX); + } + } + if (nDevices == 0) + Serial.println("No I2C devices found"); + else + Serial.println("done"); + + delay(5000); // wait 5 seconds for next scan +} From bd0f1660692bfa34b1e479278500000ad3c88c00 Mon Sep 17 00:00:00 2001 From: Testato Date: Tue, 14 Aug 2018 15:57:32 +0200 Subject: [PATCH 2/3] Update i2c_scanner.ino --- libraries/Wire/examples/i2c_scanner/i2c_scanner.ino | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino index bccea8dc39..efcc07e48d 100644 --- a/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino +++ b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino @@ -26,15 +26,22 @@ -// Pinmap for Bluepill I2Cs (by Testato) +// Example pinmap for Bluepill I2Cs (by Testato) // // I2C-1 standard pins: PB7(sda) PB6(scl) // Use it by "Wire" without pin declaration // // I2C-1 alternative pins: PB9(sda) PB8(scl) -// TwoWire Wire_alt(PB9,PB8); +// Remap the first I2C befoure call begin +// Wire.setSDA(PB9); +// Wire.setSCL(PB8); +// Wire.begin(); // -// I2C-2: PB9(sda) PB8(scl) +// I2C-2: PB11(sda) PB10(scl) +// Wire.setSDA(PB11); +// Wire.setSCL(PB10); +// +// If you want to use the two I2Cs simultaneously, create a new instance for the second I2C // TwoWire Wire2(PB11,PB10); From c7e96249ff13f6bb27ee8c65d99a6bfa81ccf065 Mon Sep 17 00:00:00 2001 From: Testato Date: Tue, 14 Aug 2018 16:01:07 +0200 Subject: [PATCH 3/3] Update i2c_scanner.ino --- libraries/Wire/examples/i2c_scanner/i2c_scanner.ino | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino index efcc07e48d..000c730cb8 100644 --- a/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino +++ b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino @@ -32,7 +32,7 @@ // Use it by "Wire" without pin declaration // // I2C-1 alternative pins: PB9(sda) PB8(scl) -// Remap the first I2C befoure call begin +// Remap the first I2C before call begin() // Wire.setSDA(PB9); // Wire.setSCL(PB8); // Wire.begin();