Docs?

[mrpackethead]

Are there any documents for using this library?

I've kind of got it working, but not quite

[mrpackethead]

In the example MCP2221_EEPROM_WriteReadTest.py, there is some code;

for i in range(MAX): data=[0]*3 data[0] = (0xFF00&i)>>8 data[1] = 0xFF&i data[2] = 0xFF&i mcp2221.I2C_Write(0x50,data)

I am trying to understand what the signficance of each byte in the data list is, and what that translates to with respect to what is transmitted on the I2c bus.

[nonNoise]

Sorry for the few comments.

data=[0]*3         <-  Make 3 arrays
data[0] = (0xFF00&i)>>8    <- EEPROM Upper address
data[1] = 0xFF&i                <- EEPROM Lower address
data[2] = 0x00                    <- data

mcp2221.I2C_Write(0x50,data)

and this is test write. data[2] = 0xFF&i <- Put the count value into the data.

Thank you.

[mrpackethead]

Can you tell me how you can set the speed of the I2C bus?

I need a way to hold SDA low for a minimum of 60uS, if i can write 0x00 to 0x00 then that should do the job if its running at less than 133Khz

[nonNoise]

PyMCP2221A.py

#######################################################################
# I2C Init
#######################################################################
    def I2C_Init(self, speed=100000):  # speed = 100000

        buf = [0x00, 0x10]
        buf = buf + [0 for i in range(65 - len(buf))]
        buf[2 + 1] = 0x00  # Cancel current I2C/SMBus transfer (sub-command)
        buf[3 + 1] = 0x20  # Set I2C/SMBus communication speed (sub-command)
        # The I2C/SMBus system clock divider that will be used to establish the communication speed
       buf[4 + 1] = int((12000000 / speed) - 3)
　　........

OK. Please try this method. I'm sorry, but I have not confirmed that the function works properly.

I2C_Init(speed=133000)

Please check with an oscilloscope. Is the speed correct?