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use the Wire library instead of twi; the Zero doesn't have twi definitions #3

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use the Wire library instead of twi; the Zero doesn't have twi definitions #3

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12 changes: 5 additions & 7 deletions I2CScanner/I2CScanner.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -6,9 +6,6 @@
*/

#include "Wire.h"
extern "C" {
#include "utility/twi.h" // from Wire library, so we can do bus scanning
}

// Scan the I2C bus between addresses from_addr and to_addr.
// On each address, call the callback function with the address and result.
Expand All @@ -18,11 +15,12 @@ extern "C" {
void scanI2CBus(byte from_addr, byte to_addr,
void(*callback)(byte address, byte result) )
{
byte rc;
byte data = 0; // not used, just an address to feed to twi_writeTo()
byte result;
for( byte addr = from_addr; addr <= to_addr; addr++ ) {
rc = twi_writeTo(addr, &data, 0, 1, 0);
callback( addr, rc );
Wire.beginTransmission(addr);
Wire.write((uint8_t)0);
result = Wire.endTransmission(true);
callback( addr, result );
}
}

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