Configurare SA818

Instalare pip

sudo apt install python3-pip

Instalare serial:

$ sudo pip3 install pyserial
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting pyserial
  Downloading https://files.pythonhosted.org/packages/0d/e4/2a744dd9e3be04a0c0907414e2a01a7c88bb3915cbe3c8cc06e209f59c30/pyserial-3.4-py2.py3-none-any.whl (193kB)
    100% |████████████████████████████████| 194kB 1.5MB/s 
Installing collected packages: pyserial
Successfully installed pyserial-3.4

Exemple programare

Standard Uart interface is used to configure the parameter of SA818 Walkie Talkie. The format of UART is 9600, 8, N, 1, which means: Baud = 9600, data bit = 8bit, Parity = None, Stop bit = 1 bit. The interface is TTL or CMOS @3.3V. The parameters which can be configured are: Bandwidth, Tx-frequency, Rx-frequency, SQ, Tx_SubAudio(Tx_CTCSS/ Tx-CDCSS), Rx_SubAudio (Rx_CTCSS/Rx-CDCSS), Volume, Scan frequency, Audio filter, etc. When commands received, the module will verify and reply acknowledge message; User should wait enough time to send the next command until received the acknowledge signal.

AT+DMOCONNECT

AT+DMOSETGROUP=GBW,TFV, RFV,Tx_CTCSS,SQ,Rx_CTCSS

. GBW: Channels space. 0.12.5k; 1.25k . TFV: Transmit frequency. Range: 134.0000~174.0000MHz . RFV: Receive frequency. Range: 134.0000~174.0000MHz. The frequency should be the times of 12.5KHz or 25KHz. . Tx_CTCSS: CTCSS value in transmit PL103.5 = 13, PL123 = 18 . SQ: Squelch level (0~8). 0. monitor mode which can.t be used in scanning mode. . Rx_CTCSS: CTCSS value in receive PL103.5 = 13, PL123 = 18 . x: Configuration result. 0. succeeded; 1. data out of range.

De exemplu:

AT+DMOSETGROUP=0,152.1250,152.1250,0012,4,0003<CR><LF>

Sau:

AT+DMOSETGROUP=0,152.1250,152.1250,754N,4,445I<CR><LF>

Răspuns:

+DMOSETGROUP:0<CR><LF>  OK

Exemple:

AT+DMOSETGROUP=1,432.7750,432.7750,0018,8,0013
AT+DMOSETGROUP=1,432.5000,432.5000,0013,8,0013
AT+DMOSETGROUP=1,432.5000,432.5000,0025,8,0025
AT+DMOSETGROUP=1,432.5000,432.5000,0000,8,0000
AT+DMOSETGROUP=1,432.7750,432.7750,0000,8,0000

Configurarea volumului:

Forma:

AT+DMOSETVOLUME=X

Nivelul volumului este în intervalul 1--8

AT+DMOSETVOLUME=3

Filtre

AT+SETFILTER=PRE/DE-EMPH, HIGHPASS, LOWPASS

PRE/DE-EMPH: 1: emphasis bypass 0: emphasis normal

HIGHPASS: 1: voice_highpass_filter_bypass 0: voice_highpass_filter normal

LOWPASS: 1: voice_lowpass_filter_bypass 0: voice_lowpass_filter normal

AT+SETFILTER=0,0,0

Configurarea tonului de închidere

Format:

AT+SETTAIL=TAIL

TAIL: 1: open tail tone 0: close tail tone

RSSI

Format:

RSSI?

Valorile RSSI sunt de la 0 la 255, unitate de 1dB

Versiunea modulului

Format:

AT+VERSION

Erori comunicare serială

>> AT+DMOCONNECT
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 537, in write
    n = os.write(self.fd, d)
OSError: [Errno 5] Input/output error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/tom/scripts/orangeserial.py", line 33, in <module>
    ser.write((rinput + '\r\n').encode('utf-8'))
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 571, in write
    raise SerialException('write failed: {}'.format(e))
serial.serialutil.SerialException: write failed: [Errno 5] Input/output error

By default Raspbian configures the Raspberry Pi serial port (GPIO14-GPIO15) to provide boot-up information. It also allows you to login via a connected device. If you need to use the Pi’s serial port for something else (i.e. a specific add-on board) you will need to disable this default functionality.

• Free Your Raspberry Pi Serial Port

Comenzi

Coduri CTCSS

NS	PL	Hz
1	XZ	67.0
39	WZ	69.3
2	XA	71.9
3	WA	74.4
4	XB	77.0
5	WB	79.7
6	YZ	82.5
7	YA	85.4
8	YB	88.5
9	ZZ	91.5
10	ZA	94.8
11	ZB	97.4
12	1Z	100.0
13	1A	103.5
14	1B	107.2
15	2Z	110.9
16	2A	114.8
17	2B	118.8

NS	PL	Hz
18	3Z	123.0
19	3A	127.3
20	3B	131.8
21	4Z	136.5
22	4A	141.3
23	4B	146.2
NATO		150.0
24	5Z	151.4
25	5A	156.7
40		159.8
26	5B	162.2
41		165.5
27	6Z	167.9
42		171.3
28	6A	173.8
43		177.3
29	6B	179.9
44		183.5

NS	PL	Hz
30	7Z	186.2
45		189.9
31	7A	192.8
46		196.6
47		199.5
32	M1	203.5
48	8Z	206.5
33	M2	210.7
34	M3	218.1
35	M4	225.7
49	9Z	229.1
36	M5	233.6
37	M6	241.8
38	M7	250.3
50	0Z	254.1