GSM/GPRS Module Series
M85 Hardware Design
M85_Hardware_Design Confidential / Released 59 / 88
Table 17: QPCMON Command Description
AT+QPCMVOL
can configure the volume of input and output.
AT+QPCMVOL=vol_pcm_in, vol_pcm_out
Table 18: QPCMVOL Command Description
3.12. ADC
The module provides an ADC channel to measure the value of voltage. Please give priority to the use of
ADC0 channel. The command
AT+QADC
can read the voltage value applied on ADC0 pin. For details of
this AT command, please refer to the
document [1]
.
In order to improve the accuracy of ADC, the layout
of ADC should be surrounded by ground.
Parameter
Scope
Description
Mode
0~2
0: Close PCM
1: Open PCM
2: Open PCM when audio talk is set up
Sync_Type
0~1
0: Short synchronization
1: Long synchronization
Sync_Length
1~8
Programmed from one bit to eight bit
SignExtension
0~1
0: Zero padding
1: Sign extension
MSBFirst
0~1
0: MSB first
1: Not supported
Parameter
Scope
Description
vol_pcm_in
0~32767
Set the input volume
vol_pcm_out
0~32767
Set the output volume
The voice may be distorted when this value exceeds 16384.
