From 13bace4bb9e37af02c36e52951399c739563f549 Mon Sep 17 00:00:00 2001 From: CombiesGit Date: Fri, 16 Aug 2019 08:53:43 +0200 Subject: Update twi.c Added __attribute__ ((fallthrough)); --- libraries/Wire/src/utility/twi.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'libraries/Wire') diff --git a/libraries/Wire/src/utility/twi.c b/libraries/Wire/src/utility/twi.c index 171af73..1a35146 100644 --- a/libraries/Wire/src/utility/twi.c +++ b/libraries/Wire/src/utility/twi.c @@ -445,6 +445,7 @@ ISR(TWI_vect) case TW_MR_DATA_ACK: // data received, ack sent // put byte into buffer twi_masterBuffer[twi_masterBufferIndex++] = TWDR; + __attribute__ ((fallthrough)); case TW_MR_SLA_ACK: // address sent, ack received // ack if more bytes are expected, otherwise nack if(twi_masterBufferIndex < twi_masterBufferLength){ @@ -530,6 +531,7 @@ ISR(TWI_vect) twi_txBufferLength = 1; twi_txBuffer[0] = 0x00; } + __attribute__ ((fallthrough)); // transmit first byte from buffer, fall case TW_ST_DATA_ACK: // byte sent, ack returned // copy data to output register -- cgit v1.2.3-18-g5258 From 319be020ed0cd445d3ab5ea4a6c76acef0646598 Mon Sep 17 00:00:00 2001 From: Asuki Kono Date: Mon, 16 Sep 2019 20:51:40 +0900 Subject: Add i2c_scanner to example of Wire (#93) --- .../Wire/examples/i2c_scanner/i2c_scanner.ino | 75 ++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 libraries/Wire/examples/i2c_scanner/i2c_scanner.ino (limited to 'libraries/Wire') 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 0000000..3febbf4 --- /dev/null +++ b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino @@ -0,0 +1,75 @@ +// -------------------------------------- +// 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 +// https://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. +// Version 6, November 27, 2015. +// Added waiting for the Leonardo serial communication. +// +// +// This sketch tests the standard 7-bit addresses +// Devices with higher bit address might not be seen properly. +// + +#include + +void setup() { + Wire.begin(); + + Serial.begin(9600); + while (!Serial); // Leonardo: wait for serial monitor + Serial.println("\nI2C Scanner"); +} + +void loop() { + int nDevices = 0; + + Serial.println("Scanning..."); + + for (byte 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); + byte error = Wire.endTransmission(); + + if (error == 0) { + Serial.print("I2C device found at address 0x"); + if (address < 16) { + Serial.print("0"); + } + Serial.print(address, HEX); + Serial.println(" !"); + + ++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\n"); + } else { + Serial.println("done\n"); + } + delay(5000); // Wait 5 seconds for next scan +} -- cgit v1.2.3-18-g5258