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  • Resolved

AM1806: The way to change pinmux configuration runtime

Expert 5420 points
HaTa

Replies: 2

Views: 35

Part Number: AM1806

Hi ,

Customer would like to switch pinmux configuration dynamically between I2C and GPIO.

Could you please share the procedure for it?

For example, currently they are thinking to follow the sequences below to switch pinmux configuration for pin G18 and G16. 

The order of each step is correct? There is no any mitting steps?

・Disable I2C

　ICMDR[0:IRS] =0

　↓

・Change from I2C to GPIO

　ICPFUNC[0:PFUNC0]=1

　↓

・Change IO configuration

　ICPDIR[1-0:PDIRx]=11b

　↓

・Use pin G18 and G16 as GPIO

　↓

・Switch back from GPIO to I2C

　ICPDIR[1-0:PDIRx] = 00b

　ICPFUNC[0:PFUNC0]=0

　ICMDR[5:IRS]=1

Thanks and Best regards,

Hata.

Expert 5420 points
HaTa
  • Expert 93785 points
    Rahul Prabhu

    HaTa,

    AM18x devices do allow pin to be changed during runtime. There are two ways of doing this either at I2C module level or at SOC PINMUX level. With Pinmux register, you can change setting in PINMUX4[15:12] and PINMUX[11:8] to change the pin from I2C to GPIO and I2C module level this can be done using ICPFUNC as you are trying to do. From SOC perspective Disabling I2C, changing IO configuration sequence looks good.

    From application perspective besides changing the pin functionality, the application software may need to take other actions. For example, it needs to handle termination of ongoing transactions, interrupts enabled, cleaning DMA channels(if applicable) and close the peripheral drivers. I am not sure what component is connected to the I2C and if it is running in master or slave mode but you may need to have some messaging to external components to indicated I2C transactions are paused. 

    Regards,

    Rahul

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  • Expert 5420 points
    HaTa

    In reply to Rahul Prabhu:

    Hi Rahul

    Thanks for giving me a detailed information!

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