Software I2C via PlatformIO (Arduino Nano BLE 33)

8

I had a wander through the code. The delay is used to ensure that the state of the data line, SDA, is read or changed, half way through the clock pulse on the clock line, SCL.

For example, to transmit a byte:

void SoftwareI2C::sendByte(uint8_t ucDta)
{
    for(uint8_t i=0; i<8; ++i)
    {
        sdaSet((ucDta&0x80)!=0);
        sclSet(HIGH);
        tunedDelay(_half_bit_delay_us);
        sclSet(LOW);
        tunedDelay(_half_bit_delay_us);
        ucDta <<= 1;
    }
}

The SDA line is raised or lowered, the SCL line is raised, then a delay, then lowered then another delay, then the next data bit is processed. That’s pretty much all that’s needed.

It’s not PlatformIO, it’s AVR and non-AVR microcontrollers.

In your code, somewhere, add #define __AVR__. Does that make any difference? Probably above where the header for the SoftwareI2C library is included.

Cheers,
Norm.