CHANNEL_DEMUX_MASK is only used within STM32469I-Discovery.
 
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CHANNEL_DEMUX_MASK macro

Syntax

#define CHANNEL_DEMUX_MASK ((uint8_t)0x55)

References

LocationText
stm32469i_discovery_audio.h:210
#define CHANNEL_DEMUX_MASK ((uint8_t)0x55)
stm32469i_discovery_audio.c:1044
app_pdm[(index*2)+1] = Channel_Demux[byte1 & CHANNEL_DEMUX_MASK] | Channel_Demux[byte2 & CHANNEL_DEMUX_MASK] << 4;
stm32469i_discovery_audio.c:1045
app_pdm[(index*2)] = Channel_Demux[(byte1 >> 1) & CHANNEL_DEMUX_MASK] | Channel_Demux[(byte2 >> 1) & CHANNEL_DEMUX_MASK] << 4;