I have an ADH8066 GSM module that I'm trying to get up and running. I'm powering it with 4V (via a 2A adjustable regulator), and I'm using a Bus Pirate connected to its RX0 and TX0 lines. I'm not using RTS/DSR/CTS, because the datasheet says it doesn't do flow control by default. I do have a SIM card installed, but it's a non-activated one. I don't expect that to make a difference to whether or not the UART interface is available.
I'm pulling ONKEY low for about 2 seconds to turn it on. It's powering up, and I get the following output:
IIII SystemInit +ADSYS: BK=0x1,0x11, RV=0x1, Fail=0x0 +ADSYS: FLASH VERIFY OK Ready
However, it doesn't seem to accept any input. I believe that remote echo is turned on by default, but I get nothing echoed back to me.
AT does not result in
OK, and no other informational command gives me any output. I've sent commands with explicit
"AT+CGMM" 13 10 to ensure the line ending is correct.
During all this, GPIO10 (ready for AT command) remains low. The datasheet doesn't say which state is active, but I'm assuming active high based on some people's LED wiring.
Is there something else I'm not doing?