I2C on Orange Pi 3, Armbian buster

kzhang

This issue is also posted in Armbian forum: https://forum.armbian.com/topic/12646-orange-pi-3-i2c-works-while-3rd-party-application-doesnt/

Hi,

I am facing an i2c problem on orange pi 3.

The i2c0 is enabled in armbian-config.

The i2cdetect output is correct, as I know my two slave boards connecting to gpio pin3 (SDA) and pin5(SCL) have the addresses 0x20 and 0x23.

pi@orangepi3:~$ sudo i2cdetect -y 0
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: 20 -- -- 23 -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --                        
pi@orangepi3:~$

However, when I use wiringOP library to access(read and write) slave i2c chip(mcp23008) registers, it always return -1.

int main(int argc, char** argv)
{
    int fd_s1 = wiringPiI2CSetup(SLAVE_1_DEVICE_ID); //0x20
    if (fd_s1 == -1)
    {
        std::cout << "Failed to init I2C Slave 1 communication." << std::endl;
        return -1;
    }

    int fd_s2 = wiringPiI2CSetup(SLAVE_2_DEVICE_ID); //0x23
    if (fd_s2 == -1)
    {
        std::cout << "Failed to init I2C Slave 2 communication." << std::endl;
        return -1;
    }

    std::cout << "I2C communication successfully setup." << std::endl;

    int reg_read;
    reg_read = wiringPiI2CReadReg8(fd_s1, REG_IODIR); //The register address is correct, as this code ran on raspberry Pi correctly
    std::cout << reg_read << std::endl;
}

Run output:

I2C communication successfully setup.

-1

The wiringOP library is from https://github.com/orangepi-xunlong/WiringOP

In the wiringPi library (in wiringOP), the code in wiringPiI2C.c shows that all APIs return -1, if the ioctl system call returns fault.

Not sure what I should investigate next step to solve this problem.

Thanks.

Marians

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