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The dmascc_cfg utility
======================
Use this utility to configure the dmascc driver.
Usage:
------
dmascc_cfg <interface> [ options ... ]
Options:
--------
--show Show all configurable parameters for this port.
May be specified at any time by any user.
All other options change parameters and thus may only be specified
- by root
- when the interface is down
--speed <f> Set frequency of baud rate generator. 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 <i> Set 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 <f> Set transmit delay in ms (0 < f < 2500).
--txtime <f> Set maximum time in s the transmitter may be active
(0 < f).
--sqdelay <f> Set squelch delay in ms (0 < f < 2500).
--slottime <f> Set slot time in ms (0 < f < 2500).
--waittime <f> Set the minimum time in ms between transmitter off and
transmitter on (0 < f < 2500).
--persist <i> Set persistence parameter (0 <= i <= 255).
--dma <i> Set DMA channel (0, 1, or 3). 0 disables DMA.
<f> ... floating-point argument, <i> ... integer argument.
Parameters are not checked for validity. The driver or the kernel may crash
if you specify invalid values.
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