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DTWI scanner
Created Thu, 17 Mar 2016 23:11:09 +0000 by GastonLagaffe
GastonLagaffe
Thu, 17 Mar 2016 23:11:09 +0000
Salut,
as I read a lot about moving from Wire to DTWI, I wrote a simple scanner of the addresses using DTWI:
// --------------------------------------
// DTWIscanner v1.0
// Author: Dr. Mathias Wilhelm
// Copyright 2016 - CC BY-NC-SA
// Creative Commons Attribution 4.0 International license.
//
#include <DTWI.h>
DTWI0 dtwi0;
void setup()
{
Serial.begin(9600);
SerialDelay(5); // wait to start serial monitor
Serial.println("I2C Scanner v1.0");
Serial.println("based on DTWI library");
SerialDelay(5);
Serial.println("starting master mode");
dtwi0.beginMaster();
}
void loop()
{
byte error, address;
int nDevices;
Serial.println("Scanning...");
nDevices = 0;
for(address = 8; address < 127; address++ )
{
// The DTWIscanner uses the return value of
// the DTWI0.stopMaster() to see if
// a device did acknowledge to the address.
dtwi0.startMasterWrite(address);
delay(10);
if(!dtwi0.stopMaster())
{
Serial.print("I2C device found at address 0x");
if (address<16) Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
nDevices++;
}
}
if (nDevices == 0) Serial.println("No I2C devices found\n");
else Serial.println("done\n");
SerialDelay(5); // wait 5 seconds for next scan
}
void SerialDelay(int s){
Serial.print("Wait for ");
Serial.print(s);
Serial.print(" seconds ");
for (int i=s; i>0; i--){
Serial.print("\b");
Serial.print(i);
delay(1000);
}
Serial.println("\bdone");
}
Output with a OLED attached:
I2C Scanner v1.0
based on DTWI library
Wait for 5 seconds done
starting master mode
Scanning...
I2C device found at address 0x3C !
done
Wait for 5 seconds done
Scanning...
I2C device found at address 0x3C !
done
Enjoy! Mathias
majenko
Thu, 17 Mar 2016 23:21:45 +0000
Nice one! You should fork the chipKIT-core repository and submit it as an example to the DTWI library. That would be a valuable addition.
https://github.com/chipKIT32/chipKIT-core/
GastonLagaffe
Fri, 18 Mar 2016 09:13:17 +0000
Salut Matt,
just changed it to scan all I2C buses if present and tested it on my HelvePic32SMD44 where I have both buses on pins.
// --------------------------------------
// DTWIscanner v2.0
// Author: Dr. Mathias Wilhelm
// Copyright 2016 - CC BY-NC-SA
// Creative Commons Attribution 4.0 International license.
//
// 17.03.2016 v1.0 initial release
// 18.03.2016 v1.1 extending to scan multiple I2C buses is present
//
#include <DTWI.h>
DTWI0 dtwi0;
#ifdef _DTWI1_BASE
DTWI1 dtwi1;
#endif
#ifdef _DTWI2_BASE
DTWI2 dtwi2;
#endif
#ifdef _DTWI3_BASE
DTWI3 dtwi3;
#endif
#ifdef _DTWI4_BASE
DTWI4 dtwi4;
#endif
uint8_t numbus = 1; // assuming that this script is started on a system with at least one I2C bus
void setup()
{
#ifdef _DTWI1_BASE
numbus++;
#endif
#ifdef _DTWI2_BASE
numbus++;
#endif
#ifdef _DTWI3_BASE
numbus++;
#endif
#ifdef _DTWI4_BASE
numbus++;
#endif
Serial.begin(9600);
delay(5000); // allow the user to start serial monitor
Serial.println("I2C Scanner v1.0");
Serial.println("based on DTWI library");
Serial.print("number of I2C buses found on this board: ");
Serial.println(numbus);
SerialDelay(5);
}
void loop()
{
byte error, address;
int nDevices;
// ========================================================== I2C BUS 0
Serial.println("starting master mode on I2C bus -= 0 =-");
dtwi0.beginMaster();
nDevices = 0;
for(address = 8; address < 127; address++ )
{
// The DTWIscanner uses the return value of
// the DTWI0.stopMaster() to see if
// a device did acknowledge to the address.
dtwi0.startMasterWrite(address);
delay(10);
if(!dtwi0.stopMaster())
{
Serial.print("I2C device found at address 0x");
if (address<16) Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
nDevices++;
}
}
if (nDevices == 0) Serial.println("No I2C devices found\n");
dtwi0.endMaster();
// ========================================================== I2C BUS 1
#ifdef _DTWI1_BASE
Serial.println("starting master mode on I2C bus -= 1 =-");
dtwi1.beginMaster();
nDevices = 0;
for(address = 8; address < 127; address++ )
{
dtwi1.startMasterWrite(address);
delay(10);
if(!dtwi1.stopMaster())
{
Serial.print("I2C device found at address 0x");
if (address<16) Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
nDevices++;
}
}
if (nDevices == 0) Serial.println("No I2C devices found\n");
dtwi1.endMaster();
#endif
// ========================================================== I2C BUS 2
#ifdef _DTWI2_BASE
Serial.println("starting master mode on I2C bus -= 2 =-");
dtwi2.beginMaster();
nDevices = 0;
for(address = 8; address < 127; address++ )
{
dtwi2.startMasterWrite(address);
delay(10);
if(!dtwi2.stopMaster())
{
Serial.print("I2C device found at address 0x");
if (address<16) Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
nDevices++;
}
}
if (nDevices == 0) Serial.println("No I2C devices found\n");
dtwi2.endMaster();
#endif
// ========================================================== I2C BUS 3
#ifdef _DTWI3_BASE
Serial.println("starting master mode on I2C bus -= 3 =-");
dtwi3.beginMaster();
nDevices = 0;
for(address = 8; address < 127; address++ )
{
dtwi3.startMasterWrite(address);
delay(10);
if(!dtwi3.stopMaster())
{
Serial.print("I2C device found at address 0x");
if (address<16) Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
nDevices++;
}
}
if (nDevices == 0) Serial.println("No I2C devices found\n");
dtwi3.endMaster();
#endif
// ========================================================== I2C BUS 4
#ifdef _DTWI4_BASE
Serial.println("starting master mode on I2C bus -= 4 =-");
dtwi4.beginMaster();
nDevices = 0;
for(address = 8; address < 127; address++ )
{
dtwi4.startMasterWrite(address);
delay(10);
if(!dtwi4.stopMaster())
{
Serial.print("I2C device found at address 0x");
if (address<16) Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
nDevices++;
}
}
if (nDevices == 0) Serial.println("No I2C devices found\n");
dtwi4.endMaster();
#endif
SerialDelay(5); // wait 5 seconds for next scan
}
void SerialDelay(int s){
Serial.print("Wait for ");
Serial.print(s);
Serial.print(" seconds ");
for (int i=s; i>0; i--){
Serial.print("\b");
Serial.print(i);
delay(1000);
}
Serial.println("\bdone");
}
Now I have to recall my memory on github ... (have only read from git in the past two years) :roll:
Ciao, MAthias
majenko
Fri, 18 Mar 2016 11:24:04 +0000
Github is easy... (unless you're on Windows when everything except writing a letter to your MP becomes a chore)...