Using I2C with FullSpeed USB

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  1. - 8th July 2006, 02:12 #10
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    Demon
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    D'uh, yeah, bits.

    I just use I2CREAD for a WORD and get all 16 bits in one shot.

    I checked the MicroChip site and they have the MCP23S17 which goes at a maximum of 10MHz in SPI mode. I don't think that's worth the effort to even try.

    But I did get another idea; using a 16F628 to read the MCP23016, sets 4 output pins to a binary value (I just need the number of the 1st active pin) and then sets a READY pin. The 18F4550 works on USB until the READY pin is set and then reads the 4 input pins. TADAA!!! Super fast 16 bit parallel exchange between 2 mcus.

    I just don't know how the 18F4550 can reset the READY pin though. I never got a full grasp of that concept.

    Robert


    EDIT: Reviewing my own thread from a while ago:
    http://www.picbasic.co.uk/forum/show...ight=busy+line
    Last edited by Demon; - 8th July 2006 at 02:22.
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

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