kzhang

Here is all the information I got from Armbian buster on Orangepi 3. Please give your advice if you have any. Thanks. pi@orangepi3:~$ sudo i2cdetect -l [sudo] password for pi: i2c-1 i2c DesignWare HDMI I2C adapter i2c-2 i2c mv64xxx_i2c adapter I2C adapter i2c-0 i2c mv64xxx_i2c adapter I2C adapter pi@orangepi3:~$ dmesg |grep i2c [ 2.239498] i2c /dev entries driver [ 2.944372] sun50i-h6-pinctrl 300b000.pinctrl: pin-121 (5002000.i2c) status -517 [ 2.944384] mv64xxx_i2c 5002000.i2c: Error applying setting, reverse things back [ 2.945285] axp20x-i2c 2-0036: AXP20x variant AXP806 found [ 2.952116] input: axp20x-pek as /devices/platform/soc/7081400.i2c/i2c-2/2-0036/axp221-pek/input/input0 [ 2.960280] sun50i-h6-pinctrl 300b000.pinctrl: pin-121 (5002000.i2c) status -517 [ 2.960293] mv64xxx_i2c 5002000.i2c: Error applying setting, reverse things back [ 2.968835] axp20x-i2c 2-0036: AXP20X driver loaded 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:~$ sudo i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: 30 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- pi@orangepi3:~$ sudo i2cdetect -y 2 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- UU -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- pi@orangepi3:~$

No problem, thanks Igor, does the dmesg output look good? pi@orangepi3:/boot$ dmesg |grep i2c [ 2.239314] i2c /dev entries driver [ 2.939717] sun50i-h6-pinctrl 300b000.pinctrl: pin-121 (5002000.i2c) status -517 [ 2.939730] mv64xxx_i2c 5002000.i2c: Error applying setting, reverse things back [ 2.942492] axp20x-i2c 2-0036: AXP20x variant AXP806 found [ 2.955643] input: axp20x-pek as /devices/platform/soc/7081400.i2c/i2c-2/2-0036/axp221-pek/input/input0 [ 2.962852] sun50i-h6-pinctrl 300b000.pinctrl: pin-121 (5002000.i2c) status -517 [ 2.962864] mv64xxx_i2c 5002000.i2c: Error applying setting, reverse things back [ 2.981545] axp20x-i2c 2-0036: AXP20X driver loaded pi@orangepi3:/boot$

Thanks for pointing out "our implementation", rather than using the wiringOP library, Igor. Can you share any clue of documents or instructions? Appreciated.

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.