OSError: [Errno 121] Remote I/O error

[WllTW]

Hi guys, I followed this tutorial https://github.com/adafruit/Adafruit_CircuitPython_VEML6075/issues/4 but when I'm trying to use the i2c I got the following error: Traceback (mosr call recent call last) OSError : [Error 121] Remote I/O error

1. I use I2C0 to send command to a module and count it , but when count to a few moment will error.
2. I change the I2c baud rate from config.txt and measure the frequency have not change. My module is Raspberry Pi 4 model B I2C0.

When i search many information to solve the problem, almost answer is Raspberry Pi 2/3 . It can't help me to solve the Pi 4 OSEerror. I checked the connections and enabled I2C from Raspi config.

[WllTW]

code

#import IMD_Parameter
import RPi.GPIO as GPIO
import smbus
import time
import struct

popo = 0
#####################################################

MotorA_Address = 0x05
MotorB_Address = 0x07
MotorC_Address = 0x06
MotorD_Address = 0x03

MotorA_DirectionPin = 35
MotorB_DirectionPin = 36
MotorC_DirectionPin = 37
MotorD_DirectionPin = 38
#######################     Motor/Function Init(2)
HeaderCommand_HB = 0x09             # 0x09 start for python
HeaderCommand_LB = 0x30             # 0x30 clear IRQ State

#######################     IRQ(3)
Command_AllParaReset = 0x20
Command_ClockOutputFunction = 0x22
Command_SetDividerLevel = 0x24

#######################     EEPROM(4)   not support
Command_ClearIRQState = 0x30

#######################     Motor Wait Mode(5)
Command_WriteAddress = 0x45
Command_ReadAddress = 0x46

#######################     Motor Direct Mode(6)
Command_CW_WaitMode = 0x50
Command_CCW_WaitMode = 0x52

#######################     Motor_Mode(7)
Command_DirectMode = 0x61

#######################  
Command_MotorBrake = 0x71
Command_MotorBrakeV2 = 0x72

Waitspeed = 250

directspeed = 500000

testarray = [0,1,2,3,4,5]
waitarray = [Command_CW_WaitMode,0,Waitspeed,0,100,5,6,7,8,0x55]
directarray = [Command_DirectMode,0,1,0,100,5,6,7,8,0x55]
directarray_Zero = [Command_DirectMode,0,1,0,0,5,6,7,8,0x55]
Cleararray = [0x30,0,150,3,4,5,6,7,8,0x55]

i2c = None

def initmpu():
    global i2c0
    global i2c1
    global i2c5
    global i2c6
    i2c0 = smbus.SMBus(0)
    time.sleep(1)
    i2c1 = smbus.SMBus(1)
    time.sleep(1)
    i2c5 = smbus.SMBus(5)
    i2c6 = smbus.SMBus(6)

    # to use Raspberry pi board pin numbers
    GPIO.setmode(GPIO.BOARD)

    # set up GPIO output channel, we set GPIO to OUTPUT
    GPIO.setup(MotorA_DirectionPin,GPIO.OUT)
    GPIO.setup(MotorB_DirectionPin,GPIO.OUT)
    GPIO.setup(MotorC_DirectionPin,GPIO.OUT)
    GPIO.setup(MotorD_DirectionPin,GPIO.OUT)

def Direction_Test():
    i2c0.write_block_data(MotorA_Address,0xAA,directarray)
    print("MotorA_Address-directarray")

    i2c1.write_block_data(MotorB_Address,0xAA,directarray)
    print("MotorB_Address-directarray")

    i2c5.write_block_data(MotorC_Address,0xAA,directarray)
    print("MotorC_Address-directarray")

    i2c6.write_block_data(MotorD_Address,0xAA,directarray)
    print("MotorD_Address-directarray")

    time.sleep(0.01)
    i2c0.write_block_data(MotorA_Address,0xAA,Cleararray)
    print("MotorA_Address-Cleararray")

    i2c1.write_block_data(MotorB_Address,0xAA,Cleararray)
    print("MotorB_Address-Cleararray")

    i2c5.write_block_data(MotorC_Address,0xAA,Cleararray)
    print("MotorC_Address-Cleararray")

    i2c6.write_block_data(MotorD_Address,0xAA,Cleararray)
    print("MotorD_Address-Cleararray")

    time.sleep(0.5)   

while (True):
    initmpu()
    print("init")
    while (True):
        i2c0.write_block_data(MotorD_Address,0xAA,testarray)
        #i2c1.write_block_data(MotorB_Address,0xAA,Cleararray)
        #i2c0.write_byte(MotorD_Address,0xaa);
        print(popo)
        popo = popo + 1
        time.sleep(0.1)

    #time.sleep(1)

[Gadgetoid]

Sorry for the delayed response- did you find a fix to this? I would take a wild guess that it's a wiring or signal issue.

[WllTW]

Sorry for the delayed response- did you find a fix to this? I would take a wild guess that it's a wiring or signal issue.

Hi Gadgetoid Thank your reply. When I open the bus txt file, it can work!