UMCPMIOCTL(8)

NAME
umcpmioctl - interact with a MCP2221 / MCP2221A multi-io chip

SYNOPSIS
umcpmioctl [-dh] device status
umcpmioctl [-dh] device get sram
umcpmioctl [-dh] device get gp
umcpmioctl [-dh] device get flash cs
umcpmioctl [-dh] device get flash gp
umcpmioctl [-dh] device get flash usbman
umcpmioctl [-dh] device get flash usbprod
umcpmioctl [-dh] device get flash usbsn
umcpmioctl [-dh] device get flash chipsn
umcpmioctl [-dh] device put flash gp GPn PIN_FUNCTION ...

DESCRIPTION
The umcpmioctl utility interacts with a MCP2221 / MCP2221A and can be used to pull the status of the chip, get the SRAM values, get the values from the on-board FLASH and can be used to set some of the FLASH values associated with the GPIO pins. The values from flash are copied into the SRAM when the chip enumerates or powers up.

For the put flash command, GPn is one of GP0, GP1, GP2 or GP3, and PIN_FUNCTION is one of GPIO_PIN_INPUT, GPIO_PIN_OUTPUT, GPIO_PIN_ALT0, GPIO_PIN_ALT1, GPIO_PIN_ALT2, GPIO_PIN_ALT3, DEFAULT_OUTPUT_ZERO or DEFAULT_OUTPUT_ONE.

For the put flash command, the GPn and PIN_FUNCTION pairs may be repeated.

EXAMPLES
    umcpmioctl /dev/umcpmio0ctl status

Query the chip for its status.

    umcpmioctl /dev/umcpmio0ctl get sram

Return the values from the SRAM on the chip.

    umcpmioctl /dev/umcpmio0ctl get flash cs

Return the values for the chip settings from the FLASH.

    umcpmioctl /dev/umcpmio0ctl put flash gp GP0 GPIO_PIN_INPUT

This will set the GP0 pin to be an input pin on start up of the chip.

    umcpmioctl /dev/umcpmio0ctl put flash gp GP2 GPIO_PIN_OUTPUT GP0 GPIO_PIN_ALT0

This will set the GP2 pin to be an output pin and GP0 pin to have the ALT0 function upon chip start up.

SEE ALSO
gpio(4), umcpmio(4)

HISTORY
The umcpmioctl utility first appeared in NetBSD 11.0.

AUTHORS
-nosplit The umcpmioctl utility was written by Brad Spencer <brad@anduin.eldar.org>.

BUGS
Only the gpio settings can be changed in FLASH.

The output is not very pleasant to use and one will probably need to have the data sheet for the MCP2221 / MCP2221A on hand to make sense of it.