Support for Software I2C

[goran-mahovlic]

I have done some research, and find library that should work like wire library https://github.com/Testato/SoftwareWire tested oled on Arduino UNO on pins 2 and 3, and it is working FPGAarduino returns errors on compiling Small_example.ino

[goran-mahovlic]

error: 'F_CPU' was not declared in this scope solved by adding to SoftWire.cpp

define F_CPU 100000000UL // 100 MHz

Ser.println( (uint16_t) replaced with Ser.println( (size_t)

now only few errors remain

C:\Users\gmahovlic\Downloads\arduino-1.6.5-r2-windows\arduino-1.6.5-r2\libraries\SoftwareWire\SoftwareWire.cpp: In constructor 'SoftwareWire::SoftwareWire(uint8_t, uint8_t, boolean, boolean)': C:\Users\gmahovlic\Downloads\arduino-1.6.5-r2-windows\arduino-1.6.5-r2\libraries\SoftwareWire\SoftwareWire.cpp:141:8: error: cannot convert 'volatile uint32t* {aka volatile unsigned int}' to 'volatile uint8t {aka volatile unsigned char_}' in assignment port = digitalPinToPort(_sdaPin); ^ C:\Users\gmahovlic\Downloads\arduino-1.6.5-r2-windows\arduino-1.6.5-r2\libraries\SoftwareWire\SoftwareWire.cpp:144:39: error: 'portModeRegister' was not declared in this scope _sdaDirReg = portModeRegister(port); ^ C:\Users\gmahovlic\Downloads\arduino-1.6.5-r2-windows\arduino-1.6.5-r2\libraries\SoftwareWire\SoftwareWire.cpp:147:8: error: cannot convert 'volatile uint32t {aka volatile unsigned int_}' to 'volatile uint8t {aka volatile unsigned char*}' in assignment port = digitalPinToPort(_sclPin);

[goran-mahovlic]

one by one changed uint8_t to uint32_t

only one error left

SoftwareWire.cpp: In constructor 'SoftwareWire::SoftwareWire(uint8_t, uint8_t, boolean, boolean)': SoftwareWire.cpp:144:39: error: 'portModeRegister' was not declared in this scope _sdaDirReg = portModeRegister(port); ^ Error compiling

[emard]

Let's fix a bit arduino core wiring_digital.h file so it can compile this stuff more cleanly

It can solve most of stuff except this uint8_t * should be manually converted to something like (volatile uint32_t *)

Seems mission the portModeRegister function as it seems mission and to boards.txt this might solve F_CPU build.f_cpu=

If neccessary for support, portmode, gpio.vhd module can also be modified to support this semantics

[gornjas]

F_CPU should never be hardcoded, but rather defined to equal to VARIANT_MCK, since VARIANT_MCK is already properly defined for a particular CPU configuration by pulling the right value from {build.fcpu} variable propagated from the Arduino IDE.

[emard]

F_CPU is there in the git and seems working

[goran-mahovlic]

Confirmed I2C is working now...