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stevemarple / SoftWire

Software I2C implementation for Arduino and other Wiring-type environments
GNU Lesser General Public License v2.1
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Can't compile example file #5

Closed sumeet33 closed 6 years ago

sumeet33 commented 6 years ago

Hi Steve,

I am using this library to run on LoLin NODEMCU (ESP8266) which doesn't have hardware I2C. When I try to compile example SoftWire_MLX90614 file, i get following compilation error.

Arduino: 1.8.5 (Windows 10), Board: "NodeMCU 0.9 (ESP-12 Module), 80 MHz, 115200, 4M (3M SPIFFS)"

Build options changed, rebuilding all C:\Users\sumeetpatil\Documents\Arduino\libraries\SoftWire\src\SoftWire.cpp:1:25: fatal error: util/atomic.h: No such file or directory

include <util/atomic.h>

                     ^

compilation terminated.

exit status 1 Error compiling for board NodeMCU 0.9 (ESP-12 Module).

Question: Can the clock frequency set to 400KHz in this Library?

Regards, Sumeet

stevemarple commented 6 years ago

I think the latest version (v1.1.0) will now compile on non-AVR architectures (I only use AVR). Be sure to understand the warnings given in the commit message for b6d873cfbc65502036b5295feee4a464a0c9cc85.

The clock 'frequency' is determined by the delay configured in the class, use setDelay_us() to adjust. This doesn't take into account the other delays, such as switching pin mode. For higher speed you can define your own optimized functions which do this (update the pointers _setSdaLow, _setSdaHigh, _setSclLow, _setSclHigh, _readSda, _readScl with the addresses of your own functions).

Please let me know if this fixes the compile problem for ESP8266.

stevemarple commented 6 years ago

I've made a minor change to the SoftWire_MLX90614 so that it now compiles for a generic ESP8266 module. The change can be found in v1.1.1.