Softwarewire

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Related issue # and issue behavior

A request was made to add SoftwareWire to the library. #79

Description of changes/fixes

Added BME280I2CSoftwareWire.h/cpp. Added Config.h

@mention a person to review

@daniu-de, please review the functionality of the new additions.

Steps to test

Uncomment line 32 in Config.h: #define USING_SOFTWARE_WIRE 1
Build and run the BME_280_I2C_SoftwareWire_Test.ino sketch on a live setup.

Any outstanding TODOs or known issues

Needs testing.

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TODO: Update documentation.

[daniu-de]

Hi,
THANKS A LOT!!!!

unfortunately I am getting a compilation error:
BME_280_I2C_SoftwareWire_Test.ino: In function ‘void setup()’:
BME_280_I2C_SoftwareWire_Test.ino:37:9: error: no match for ‘operator!’ (operand type is ‘TinyDebugSerial’)
BME_280_I2C_SoftwareWire_Test.ino:37:9: note: candidate is:
BME_280_I2C_SoftwareWire_Test.ino:37:9: note: operator!(bool)
BME_280_I2C_SoftwareWire_Test.ino:37:9: note: no known conversion for argument 1 from ‘TinyDebugSerial’ to ‘bool’

However I am pretty sure that I cannot properly test it this way because I do not know how to connect the sensor directly to the raspberry and see no way to see the print output - I am using tinytx3 nodes - originally created by Nathan Chantrell and I need a RFM69CW module which sends the sensor data to a receiver which is connected to a raspberry pi. This way I can read the sensor data with a raspberry pi. I got a working Sketch for HTU21D sensor which I will change so that it sends the data of a BME280.

When I succeed to make it send the data I can post the working sketch.

At the moment my sketch gives me the following error:
/root/sketchbook/libraries/BME280/BME280.cpp:31:18: fatal error: Wire.h: Datei oder Verzeichnis nicht gefunden
#include <Wire.h>

which surprises me since Wire.h should be in the path. However I am also not sure that it is right that the sketch is asking for Wire.h

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@daniu-de, what compiler/settings are you using to compile this?

The first error is because the !Serial is not supported for TinyDebugSerial. You can probably just delete line 42.

#include <Wire.h> is old code from the original version 1.0, I have removed it and committed. I was not able to compile it yet though. I will compile it when I am hope tonight (I don't think it should cause any issues).

[daniu-de]

Hi,
hmmm ... not sure about the settings. I use arduino IDE set to attiny84 with 1Mhz

The #include Wire.h is also in BMEI2C.cpp and by commenting out this line I get:

/root/sketchbook/libraries/BME280/BME280I2C.cpp: In member function ‘virtual bool BME280I2C::WriteRegister(uint8_t, uint8_t)’:
/root/sketchbook/libraries/BME280/BME280I2C.cpp:71:3: error: ‘Wire’ was not declared in this scope
Wire.beginTransmission(m_settings.bme280Addr);
^
/root/sketchbook/libraries/BME280/BME280I2C.cpp: In member function ‘virtual bool BME280I2C::ReadRegister(uint8_t, uint8_t*, uint8_t)’:
/root/sketchbook/libraries/BME280/BME280I2C.cpp:90:3: error: ‘Wire’ was not declared in this scope
Wire.beginTransmission(m_settings.bme280Addr);

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I have committed some changes that should fix the wire includes.

[daniu-de]

Hi,
sorry - I still got a problem:
BME_280_I2C_SoftwareWire_Test.ino: In function ‘void setup()’:
BME_280_I2C_SoftwareWire_Test.ino:37:9: error: no match for ‘operator!’ (operand type is ‘TinyDebugSerial’)
BME_280_I2C_SoftwareWire_Test.ino:37:9: note: candidate is:
BME_280_I2C_SoftwareWire_Test.ino:37:9: note: operator!(bool)
BME_280_I2C_SoftwareWire_Test.ino:37:9: note: no known conversion for argument 1 from ‘TinyDebugSerial’ to ‘bool’

(that is your sketch)

mine shows the follwing error in this line:
->SoftwareWire softwareWire(SDA, SCK);
BME280I2CSoftwareWire bme(softwareWire);

Error:
/usr/share/arduino/Send_BME280_n.ino:104: undefined reference to `BME280I2CSoftwareWire::BME280I2CSoftwareWire(SoftwareWire&, BME280I2C::Settings const&)'

[daniu-de]

Another issue I am having with my own sketch is:
/usr/lib/gcc/avr/4.9.2/../../../avr/bin/ld: Send_BME280_n.cpp.elf section .text' will not fit in region text'
/usr/lib/gcc/avr/4.9.2/../../../avr/bin/ld: region `text' overflowed by 1408 bytes

Is it possible that BME280 like that uses up a bit much memory?

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Sketch uses 3308 bytes (40%) of program storage space. Maximum is 8192 bytes.
Global variables use 153 bytes (29%) of dynamic memory, leaving 359 bytes for local variables. Maximum is 512 bytes.

I was able to compile the example for Attiny84 after commenting out the Serial calls.

Attiny does not support the "Serial" library, so those calls will have to be removed.

Error:
/usr/share/arduino/Send_BME280_n.ino:104: undefined reference to `BME280I2CSoftwareWire::BME280I2CSoftwareWire(SoftwareWire&, BME280I2C::Settings const&)'

Is because you need to modify the "Config.h" file to #define USING_SOFTWARE_WIRE 1 and make sure all other defines in the file are commented out.