LoRa SCPI TXC脚本

SCPI只是程控仪器，还需要主机端驱动。因为是通过USB/CDC连接，所以Python的PySerial驱动它最简单。以下是一个循环发射"PING"字符串的过程。

#!/usr/bin/env python

import serial
import time
import perference
import listport

ports = listport.serial_ports()
if len(ports):
    print "{0} ports are available".format(len(ports))
    port = ports[0]
    print "port {0} is selected".format(port)
    
ser = serial.Serial(port, 9600, timeout = 0.5)

print("Port is opened\r\n")

setups = [
    "RA:MOD LORA",
    "RA:FREQ 434",
    "RA:PAS PA_BOOST",
    "RA:OCP 170",
    "RA:BGR 7",
    "RA:POW 15",
    "RA:OP STB",
]

queries = [
    "*IDN?",
    "RA:MOD?",
    "RA:FREQ?",
    "RA:PAS?",
    "RA:OCP?",
    "RA:BGR?",
    "RA:POW?",
    "RA:OP?",
]

actions = [
    "RA:LORA:TXC 1",
    "RA:FI \"PING\"",
    "RA:OP STB",
]

for q in setups:
    ser.write(q+'\r\n')
    print(ser.readline().strip())
    time.sleep(0.1)

ser.write('\r\n')
time.sleep(1)
ser.flush()

for q in queries:
    ser.write(q+'\r\n')
    print(ser.readline().strip())
    print(ser.readline().strip())
    time.sleep(0.1)

ser.write('\r\n')
time.sleep(1)

while True:
    for q in actions:
        ser.write(q+'\r\n')
        print(ser.readline().strip())
        time.sleep(0.5)

ser.close()

可改进的地方

1. time.sleep()是堵塞型的，需要改成生成器；
2. 不是OOP的，有重复代码；
3. SCPI比AT指令集要简单，但是发现SCPI接收端丢失字符串现象，不知道是接收固件有问题，还是哪里有问题，需要LA去跟踪。