- Drivers Hame Modems For Xfinity
- Drivers Hame Modems Wireless
- Drivers Hame Modems App
- Drivers Hame Modems App
Thomas M. Sailer, HB9JNX/AE4WA, <sailer@ife.ee.ethz.ch>
The drivers for the baycom modems have been split intoseparate drivers as they did not share any code, and the driverand device names have changed.
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This document describes the Linux Kernel Drivers for simple Baycom styleamateur radio modems.
The following drivers are available:¶
- baycom_ser_fdx:
- This driver supports the SER12 modems either full or half duplex.Its baud rate may be changed via the
baudmodule parameter,therefore it supports just about every bit bang modem on aserial port. Its devices are called bcsf0 through bcsf3.This is the recommended driver for SER12 type modems,however if you have a broken UART clone that does not have workingdelta status bits, you may try baycom_ser_hdx. - baycom_ser_hdx:
- This is an alternative driver for SER12 type modems.It only supports half duplex, and only 1200 baud. Its devicesare called bcsh0 through bcsh3. Use this driver only if baycom_ser_fdxdoes not work with your UART.
- baycom_par:
- This driver supports the par96 and picpar modems.Its devices are called bcp0 through bcp3.
- baycom_epp:
- This driver supports the EPP modem.Its devices are called bce0 through bce3.This driver is work-in-progress.
The following modems are supported:
| ser12 | This is a very simple 1200 baud AFSK modem. The modem consists onlyof a modulator/demodulator chip, usually a TI TCM3105. The computeris responsible for regenerating the receiver bit clock, as well asfor handling the HDLC protocol. The modem connects to a serial port,hence the name. Since the serial port is not used as an async serialport, the kernel driver for serial ports cannot be used, and thisdriver only supports standard serial hardware (8250, 16450, 16550) |
| par96 | This is a modem for 9600 baud FSK compatible to the G3RUH standard.The modem does all the filtering and regenerates the receiver clock.Data is transferred from and to the PC via a shift register.The shift register is filled with 16 bits and an interrupt is signalled.The PC then empties the shift register in a burst. This modem connectsto the parallel port, hence the name. The modem leaves theimplementation of the HDLC protocol and the scrambler polynomial tothe PC. |
| picpar | This is a redesign of the par96 modem by Henning Rech, DF9IC. The modemis protocol compatible to par96, but uses only three low power ICsand can therefore be fed from the parallel port and does not requirean additional power supply. Furthermore, it incorporates a carrierdetect circuitry. |
| EPP | This is a high-speed modem adaptor that connects to an enhanced parallelport. Its target audience is users working over a high speed hub (76.8kbit/s). |
| eppfpga | This is a redesign of the EPP adaptor. |
All of the above modems only support half duplex communications. However,the driver supports the KISS (see below) fullduplex command. It then simplystarts to send as soon as there’s a packet to transmit and does not careabout DCD, i.e. it starts to send even if there’s someone else on the channel.This command is required by some implementations of the DAMA channelaccess protocol.
The Interface of the drivers¶
Unlike previous drivers, these drivers are no longer character devices,but they are now true kernel network interfaces. Installation is thereforesimple. Once installed, four interfaces named bc{sf,sh,p,e}[0-3] are available.sethdlc from the ax25 utilities may be used to set driver states etc.Users of userland AX.25 stacks may use the net2kiss utility (also availablein the ax25 utilities package) to convert packets of a network interfaceto a KISS stream on a pseudo tty. There’s also a patch available fromme for WAMPES which allows attaching a kernel network interface directly.
Configuring the driver¶
Every time a driver is inserted into the kernel, it has to know whichmodems it should access at which ports. This can be done with the setbaycomutility. If you are only using one modem, you can also configure thedriver from the insmod command line (or by means of an option line in/etc/modprobe.d/*.conf).
Examples:
Both lines configure the first port to drive a ser12 modem at the firstserial port (COM1 under DOS). The * in the mode parameter instructs the driverto use the software DCD algorithm (see below):
Both lines configure the first port to drive a picpar modem at thefirst parallel port (LPT1 under DOS). (Note: picpar implieshardware DCD, par96 implies software DCD).
The channel access parameters can be set with sethdlc -a or kissparms.Note that both utilities interpret the values slightly differently.
Hardware DCD versus Software DCD¶
To avoid collisions on the air, the driver must know when the channel isbusy. This is the task of the DCD circuitry/software. The driver may eitherutilise a software DCD algorithm (options=1) or use a DCD signal fromthe hardware (options=0).
| ser12 | if software DCD is utilised, the radio’s squelch should always beopen. It is highly recommended to use the software DCD algorithm,as it is much faster than most hardware squelch circuitry. Thedisadvantage is a slightly higher load on the system. |
| par96 | the software DCD algorithm for this type of modem is rather poor.The modem simply does not provide enough information to implementa reasonable DCD algorithm in software. Therefore, if your radiofeeds the DCD input of the PAR96 modem, the use of the hardwareDCD circuitry is recommended. |
| picpar | the picpar modem features a builtin DCD hardware, which is highlyrecommended. |
Compatibility with the rest of the Linux kernel¶
The serial driver and the baycom serial drivers competefor the same hardware resources. Of course only one driver can access a giveninterface at a time. The serial driver grabs all interfaces it can find atstartup time. Therefore the baycom drivers subsequently won’t be able toaccess a serial port. You might therefore find it necessary to releasea port owned by the serial driver with ‘setserial /dev/ttyS# uart none’, where# is the number of the interface. The baycom drivers do not reserve anyports at startup, unless one is specified on the ‘insmod’ command line. Anothermethod to solve the problem is to compile all drivers as modules andleave it to kmod to load the correct driver depending on the application.
Drivers Hame Modems For Xfinity
The parallel port drivers (baycom_par, baycom_epp) now use the parport subsystemto arbitrate the ports between different client drivers.
Drivers Hame Modems Wireless
vy 73s de
Tom Sailer, sailer@ife.ee.ethz.ch
Drivers Hame Modems App
Drivers Hame Modems App
hb9jnx @ hb9w.ampr.org