Microchip Technology AC164145 Manuel D’Utilisation

DS75019A-page 20

© 2011 Microchip Technology Inc.

Modem and application configuration has been split into several header files, each 
responsible for a logically separated portion of the code. Each demonstration applica-
tion defines a 

config.h

 file that serves as a master configuration file and should 

include, directly or indirectly, all other configuration files. The modem and framework 
modules have their own main configuration files (

modem.h

 and 

framework.h

), normally 

included by the master 

config.h

 file. These files can be found in the 

config

 

subdirectory of the relevant project directory.
The entire configuration of the low-level modem code has been placed into three

 

configuration files, which can be found in the modem configuration 
subdirectory

modem\conf

. These configuration files are:

•

config_plm.h

: Contains options common to all modulation algorithms 

implemented and allows modulation scheme selection

•

config_bpsk.h

: Contains all BPSK configuration options

•

config_fec.h

: Contains the forward error correction configuration

All configuration options are extensively documented in the source code comments.

The following are the important configuration settings.

PLM_OE

This setting selects how the Output Enable (HiZ signal) for the transmit amplifier is 
asserted. This option is hardware-dependent and must be left at its default value for the 
daughter board provided in the kit. Possible options are: 
• Drive low to enable, high impedance to disable (default)
• Drive low to enable, drive high to disable
• Drive high to enable, drive low to disable

PLM_OE_LAT

The LAT register bit of the Output Enable signal (assembler syntax). This

 

setting must 

be changed only if a non-default JP2 jumper configuration is used. This setting must

 

match the jumper setting on the daughter board.

PLM_OE_TRIS

The TRIS register bit of the Output Enable signal (assembler syntax). This must match 
the setting for PLM_OE_LAT.

PLM_ADC_CHNL

This setting selects the ADC input number (i.e., ANx pin). The ADC configuration is 
adjusted automatically. This

 

setting must be changed only if a non-default JP3 jumper 

configuration is used. This setting must

 

match jumper setting on the daughter board.

PLM_ADC_TRIS

The TRIS register bit where the selected ANx channel is located.