I'm trying to set up a 1-Wire network using the DS2482 driver and Feather M0 (LoRa RFM95 variant).
I have troubles using the DS2482 1-wire library I've found while also accessing the feather through the COM port on my computer.
Here are the symptoms:
I CAN access the feather through the serial monitor when not using the DS2482 library (only using the Wire.h i2c library) AND I can see that the DS2482 is on the i2c bus at address 0x18. The following code works.
#include <Wire.h>
void setup()
{
Wire.begin();
Serial.begin(9600);
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.print(address,HEX);
Serial.println(" !");
nDevices++;
}
else if (error==4)
{
Serial.print("Unknow 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
}
I CANNOT access the feather through the serial monitor when trying to use the DS2482 1-wire library. When I program the feather with the code below, the COM port disappears and I can't tell using the serial console if the feather is communicating on the i2c bus correctly.
#include <Wire.h>
#include <OneWire.h>
#include <Arduino.h>
OneWire oneWire;
void printAddress(uint8_t deviceAddress[8])
{
Serial.print("{ ");
for (uint8_t i = 0; i < 8; i++)
{
// zero pad the address if necessary
Serial.print("0x");
if (deviceAddress[i] < 16) Serial.print("0");
Serial.print(deviceAddress[i], HEX);
if (i<7) Serial.print(", ");
}
Serial.print(" }");
}
void setup()
{
Serial.begin(9600);
}
void loop()
{
Serial.println("Checking for I2C devices...:");
if (oneWire.checkPresence())
{
Serial.println("DS2482-100 present");
oneWire.deviceReset();
Serial.println("\tChecking for 1-Wire devices...");
if (oneWire.wireReset())
{
Serial.println("\tDevices present on 1-Wire bus");
uint8_t currAddress[8];
Serial.println("\t\tSearching 1-Wire bus...");
while (oneWire.wireSearch(currAddress))
{
Serial.print("\t\t\tFound device: ");
printAddress(currAddress);
Serial.println();
}
oneWire.wireResetSearch();
}
else
Serial.println("No devices on 1-Wire bus");
}
else
Serial.println("No DS2482-100 present");
delay(5000);
}
The issue happens in any code where I attempt to construct a oneWire device:
#include <OneWire.h>
OneWire oneWire;
Which is weird to me because it seems all the constructor does (bold) is start the i2c bus communication just like i2c bus scanning example that worked above.
#include "OneWire.h"
#include <Wire.h>
// Constructor with no parameters for compatability with OneWire lib
OneWire::OneWire()
{
// Address is determined by two pins on the DS2482 AD1/AD0
// Pass 0b00, 0b01, 0b10 or 0b11
mAddress = 0x18;
mError = 0;
Wire.begin();
}
OneWire::OneWire(uint8_t address)
{
// Address is determined by two pins on the DS2482 AD1/AD0
// Pass 0b00, 0b01, 0b10 or 0b11
mAddress = 0x18 | address;
mError = 0;
Wire.begin();
}
... the rest of the library
I'm not quite sure what to try next... I know the i2c bus and serial monitor can work at the same time (which is something I've seen people have trouble with on forums). I don't know why constructing the oneWire device causes the COM port to disappear. Please help.
