---
name: "dmascc_cfg"
section: "1"
platform: "linux"
package: "ax25-tools"
version: "0.0.10-rc5+git20190411+3595f87-6"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/dmascc_cfg"
---

# dmascc\_cfg(1)

Configure dmascc devices

## NAME

dmascc\_cfg - Configure dmascc devices

## SYNOPSIS

**dmascc \<interface\> \[\<options\>\]**

## DESCRIPTION

**dmascc\_cfg** is used to configure dmascc devices such as PI2 and PackeTwin cards.  The **--show** option can be used by any user, all other options must be used by root.

## OPTIONS

- **--speed** *frequency*

  Set frequency of baud rate generator to *frequency*. A value of 0 disables the baud rate generator and the digital PLL. Use the **--show** option to check whether the frequency you selected could be approximated with sufficient accuracy.

- **--nrzi** *\[0\|1\]*

  *0* selects NRZ mode, *1* selects NRZI mode.

- **--clocks** *integer*

  Set the clock mode. You may **OR** together three choices (other values are not supported and may cause strange results).

TX clock pin:

-

  0x00 input\
   0x05 output TX clock \*\
   0x06 output baud rate generator \*\
   0x07 output digital PLL \*

TX clock source:

-

  0x00 RX clock pin\
   0x08 TX clock pin #\
   0x10 baud rate generator\
   0x18 digital PLL +\

RX clock source:

-

  0x00 RX clock pin\
   0x20 TX clock pin\
   0x40 baud rate generator\
   0x60 digital PLL +\

\* Not allowed on PI2 Port A if J3 is installed.

\# TX clock pin must be configured as input.

\+ Speed must be equal to 32 times the baud rate.

- **--txdelay** *milliseconds*

  Set transmit delay to *milliseconds*. Maximum is 2500 ms.

- **--txtime** *seconds*

  Set maximum time the transmitter may be active to *seconds*.

- **--sqdelay** *milliseconds*

  Set the squelch delay to *milliseconds*. Maximum delay is 2500 ms.

- **--slottime** *milliseconds*

  Set the slot time to *milliseconds*. Maximum slottime is 2500 ms.

- **--waittime** *milliseconds*

  Set the minimum time between the transmitter turning off to when it turns on to *milliseconds*. Maximum wait time is 2500 ms.

- **--persist** *f*

  Set the persistence parameter to *f*. Must be between 0 and 255 (inclusive).

- **--dma** *channel*

  Set the DMA channel to *channel*. Can be 1 or 3.  Setting to 0 disables DMA.

## BUGS

**dmascc\_cfg** does not check the parameters for validity. The driver or kernel may crash if you specify invalid values.

## AUTHORS

```
Klaus Kudielka
This manual page written by Craig Small <csmall@small.dropbear.id.au>
```