Renesas RX231, Руководство пользователя

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Hear-it! Solution Kit 5 Embedded Firmware Application
R12UZ0012EG0110 Rev. 1.10 Page 20 of 34
Apr 03, 2017
5.3 Software Configurations
5.3.1 Streaming Sample Application
The Hear-it! Streaming sample application, “rx231_dsp_demo” has various configurable options. These are
located in the source file main.h.
5.3.1.1 Input Channel Selection
The input audio channel to be used for the DSP processing can be configured by setting the AUDIO_CHANNEL
#define to the LEFT channel or the RIGHT channel. This can be seen in Figure 5-1 where AUDIO_CHANNEL
is set to LEFT (default setting).
Figure 5-1 : Streaming Input Channel Configuration
5.3.1.2 Output Channel Selection
The application can be configured to select the channel or combination of channels to use for the processed
audio output. The default setting is for both channels to be used as the output.
Figure 5-2 : Streaming Output Channel Configuration
5.3.1.3 Volume Control Scheme
The sample application by default uses a software attenuation function to control the volume of the audio signal.
It is possible to configure the application to use the CODEC to control the volume. In order to select this,
uncomment the following #define
Figure 5-3 : Streaming Volume Configuration Selection