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Added code to demonstrate use of new I2C timeout feature #356

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Added code to demonstrate use of new I2C timeout feature #356

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ae3dd32
Added code to demonstrate use of new I2C timeout feature
paynterf Jul 11, 2020
8aa1cef
Move anti-lockup code to beginning of Setup()
paynterf Jul 16, 2020
b9a9ab3
Remove 'clearWireTimeoutFlag()' from setup. It is explicitly cleared…
paynterf Jul 16, 2020
cf81cfc
Add check for WIRE_HAS_TIMEOUT
matthijskooijman Sep 26, 2020
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19 changes: 19 additions & 0 deletions libraries/Wire/examples/i2c_scanner/i2c_scanner.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@
// A sensor seems to use address 120.
// Version 6, November 27, 2015.
// Added waiting for the Leonardo serial communication.
// Version 6, July 10, 2020 by G. Frank Paynter
// Demonstrates the use of the new Wire library timeout feature
//
//
// This sketch tests the standard 7-bit addresses
Expand All @@ -29,15 +31,32 @@

#include <Wire.h>

uint16_t wireTimeoutCount; //capture I2C bus timeout events

void setup() {
Wire.begin();

#if defined(WIRE_HAS_TIMEOUT)
// Prevent lockups on bus problems by aborting after a timeout
Wire.setWireTimeout(3000, true); //timeout value in uSec, true to reset I2C bus on timeout
wireTimeoutCount = 0;
#endif

Serial.begin(9600);
while (!Serial); // Leonardo: wait for serial monitor
Serial.println("\nI2C Scanner");
}

void loop() {
#if defined(WIRE_HAS_TIMEOUT)
if (Wire.getWireTimeoutFlag())
{
wireTimeoutCount++;
Wire.clearWireTimeoutFlag();
Serial.print("Wire timeout detected; count now "); Serial.println(wireTimeoutCount);
}
#endif

int nDevices = 0;

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