mwyborski / rpi_i2c_bit_banging Goto Github PK

Hello, as I use a level shifter to make it work with a 5v i2c bus, I am limited with the i2c speed.
I tried to change the parameter "delayTicks_" but with the rpi4, the i2c_delay() function is still too fast and so it doesn't work.
I understand why you used a loop because usleep is limited to 80us but I suggest to replace it with delayMicroseconds() as wiringpi is used.
The new i2c_delay() function should be :

void i2cBitBangingBus::i2c_delay()
{
   // unsigned int index;
    //for (index = 0; index < delayTicks; index++)
    //    ;
    delayMicroseconds(delayTicks);
}

With delayTicks_ set to 5us when creating a bus, I manage to change the speed of 1Mhz to 100Khz ;)

Hello,

I am making a Youtube video that uses your library. It is a good one, thank you.

But to the top of that .cpp file one needs to add
#include
that nowadays seems to be needed for the error messages (Raspbian, Geany).

Would it be a problem for you to add it?

Best regards
Miika Kurkela

When I want to compile with your lib with g++ -g -Wall -fPIC lwiringPi -o PCA9685.o PCA9685.cpp i2c.o i get following error: .o: file not recognized: File format not recognized.
I had created the i2c.o with: g++ -O -lwiringPi -o i2c.o rpi_i2c_bit_banging.cpp

Please add license.

I have a problem with my IMU(MPU6050) and my DAC(PCA9685). Im using on my IMU the I2cdevlib with DMP and it seems that is critical, when you attach another device on the I2c rail then and when, you comunicate with the DAC the IMU freezes, you connect a 1.8kOhm resistor to 3.3V on the used I2c pins ?

Thanks for your answer.