How To Connect MMDVM BOARD to your GM300 GM338 GM950i
A:Using Software,Pi-star,stm32flash,MMDVMCal(come with pi-star)
B:Using Hardware,raspberry zero w or raspberry 2 B+,GM950i
Ps :Testing GM950i is very Stable then old GM300/GM338
1. hardware Connect
Current PTT+GND+RX+TX is Work
2. Using MMDVM Cal To Test if work!
Current MMDVM board have two version ,old fw don’t support NXDN,new fw support NXDN
If you want update
#stm32flash -w RPT_134.hex /dev/ttyS0
My router is ttyS0,raspberry zero w is ttyAMA0
Caution ,you Must Stop MMDVMHost frist when you Update FW.
When Done ,your fw is new now.
Next Testing Using MMDVMCal you can see the MMDVM baord is 20180327 new version
If you test USING DMR MD380 pls write TG9 and save .
Then press m to testing DMR MS 1031 Test Pattern,and press Space,Start Transmit ,then ADJUST TX ,if you can hear 1khz sound in MD380( TG9,1) your adjust is ok, stop ADJUST.
If not Press I ,Change testing Transmit Inversion,and Try Again.
If DMR testing TX is ok,no need testing P25 Testing Pattern,if you like is better.
MMDVM BOARD Woking Condition:
Power :5V
When testing D-DMR Deviation Mode,you can see TP42 or TX pin is 1.2Khz
Wave in Scope,if TX testing is not good ,pls Try TX Inversion.
Final in pi-star ,is the same Tx Inversion =0 or 1
