I am planning to use a SIM800 or SIM808 GSM/GPRS module's PCM interface. I configured the circuit according to the datasheet. I send the 256 kHz clock from the micro to the PCM_CLK pin of the module and apply the following commands to set the PCM to the module:
AT+CPCMCFG=0
AT+CPCMSYNC=0,1
AT+CHFA=4
By applying the above commands, the sound is cut off from the SPK+- output, but there is no signal on the PCM_OUT pin.
I ask you to help me. Does the SIM800 have PCM capability?
