S5P4418：4G模块EC20移植和测试笔记1. 前言2. 适配和测试2.1 适配2.2 测试

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我是靠谱客的博主可靠果汁，最近开发中收集的这篇文章主要介绍S5P4418：4G模块EC20移植和测试笔记1. 前言2. 适配和测试2.1 适配2.2 测试，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

1. 前言

限于作者能力水平，本文可能存在的谬误，因此而给读者带来的损失，作者不做任何承诺。

2. 适配和测试

2.1 适配

修改文件drivers/usb/serial/option.c，增加设备的 VID & PID：

static const struct usb_device_id option_ids[] = {
{ USB_DEVICE(0x05C6,0x9215) },
// 为EC20模块增加VID & PID
{ USB_DEVICE(0x2C7C, 0x0125) },
// EC20CFD-512-STD. 
...
};

2.2 测试

(1) 下电，如下图连接好4G模块,4G天线,插入SIM卡
在这里插入图片描述
(2) 上电。系统启动到出现命令提示符时,会得到如下输出:

(3) 运行 lsusb 命令查看4G模块的USB连接状况，EC20 4G的模块会有如下图红框中的USB设备ID:

每个厂商的4G模块的USB设备VID & PID是不同的，所以对不同的4G模块，上面的输出是不同的。
(4) 查看是否存在/dev/ttyUSB*设备节点，这些设备是4G模块用来通信的，每个设备节点用途不同。如果不存在这些设备，4G模块是不能正常工作的。
在这里插入图片描述
(5) 4G拨号连接。运行命令pppd call quectel-ppp & 进行拨号,正常情况会得到如下输出:

# pppd call quectel-ppp &
# pppd options in effect:
debug
# (from /etc/ppp/peers/quectel-ppp)
nodetach
# (from /etc/ppp/peers/quectel-ppp)
dump
# (from /etc/ppp/peers/quectel-ppp)
noauth
# (from /etc/ppp/peers/quectel-ppp)
user test
# (from /etc/ppp/peers/quectel-ppp)
password ??????
# (from /etc/ppp/peers/quectel-ppp)
remotename 3gppp
# (from /etc/ppp/peers/quectel-ppp)
/dev/ttyUSB3
# (from /etc/ppp/peers/quectel-ppp)
115200
# (from /etc/ppp/peers/quectel-ppp)
lock
# (from /etc/ppp/peers/quectel-ppp)
connect chat -s -v -f /etc/ppp/peers/quectel-chat-connect
# (from /etc/ppp/peers/quectel-ppp)
disconnect chat -s -v -f /etc/ppp/peers/quectel-chat-disconnect
# (from /etc/ppp/peers/quectel-ppp)
nocrtscts
# (from /etc/ppp/peers/quectel-ppp)
modem
# (from /etc/ppp/peers/quectel-ppp)
hide-password
# (from /etc/ppp/peers/quectel-ppp)
novj
# (from /etc/ppp/peers/quectel-ppp)
novjccomp
# (from /etc/ppp/peers/quectel-ppp)
ipcp-accept-local
# (from /etc/ppp/peers/quectel-ppp)
ipcp-accept-remote
# (from /etc/ppp/peers/quectel-ppp)
ipparam 3gppp
# (from /etc/ppp/peers/quectel-ppp)
noipdefault
# (from /etc/ppp/peers/quectel-ppp)
ipcp-max-failure 30
# (from /etc/ppp/peers/quectel-
ppp)
defaultroute
# (from /etc/ppp/peers/quectel-ppp)
usepeerdns
# (from /etc/ppp/peers/quectel-ppp)
noccp
# (from /etc/ppp/peers/quectel-ppp)
abort on (BUSY)
abort on (NO CARRIER)
abort on (NO DIALTONE)
abort on (ERROR)
abort on (NO ANSWER)
timeout set to 30 seconds
send (AT^M)
expect (OK)
AT^M^M
OK
-- got it
send (ATE0^M)
expect (OK)
^M
ATE0^M^M
OK
-- got it
send (ATI;+CSUB;+CSQ;+CPIN?;+COPS?;+CGREG?;&D2^M)
expect (OK)
^M
^M
Quectel^M
EC20^M
Revision: EC20CQAR02A07E2G^M
^M
SubEdition: V03^M
^M
+CSQ: 28,99^M
^M
+CPIN: READY^M
^M
+COPS: 0,0,"CHINA
MOBILE CMCC",7^M
^M
expect (CONNECT)
^M
^M
CONNECT
-- got it
Script chat -s -v -f /etc/ppp/peers/quectel-chat-connect finished (pid 228), status = 0x0
Serial connection established.
using channel 1
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB3
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xc97b788e>
<pcomp> <accomp>]
rcvd [LCP ConfReq id=0x0 <asyncmap 0x0> <auth chap MD5> <magic 0x16be8765> <pcomp> <accomp>]
sent [LCP ConfAck id=0x0 <asyncmap 0x0> <auth chap MD5> <magic 0x16be8765> <pcomp> <accomp>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0xc97b788e> <pcomp> <accomp>]
rcvd [LCP DiscReq id=0x1 magic=0x16be8765]
rcvd [CHAP Challenge id=0x1 <ce75169e767890d400f8d45890f5e505>, name = "UMTS_CHAP_SRVR"]
sent [CHAP Response id=0x1 <16e21983dd474e25f437c19846143f1d>, name = "test"]
rcvd [CHAP Success id=0x1 ""]
CHAP authentication succeeded
CHAP authentication succeeded
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
rcvd [IPCP ConfReq id=0x0]
sent [IPCP ConfNak id=0x0 <addr 0.0.0.0>]
rcvd [IPCP ConfNak id=0x1 <addr 10.20.52.69> <ms-dns1 221.179.38.7> <ms-dns2 120.196.165.7>]
sent [IPCP ConfReq id=0x2 <addr 10.20.52.69> <ms-dns1 221.179.38.7> <ms-dns2 120.196.165.7>]
rcvd [IPCP ConfReq id=0x1]
sent [IPCP ConfAck id=0x1]
rcvd [IPCP ConfAck id=0x2 <addr 10.20.52.69> <ms-dns1 221.179.38.7> <ms-dns2 120.196.165.7>]
Could not determine remote IP address: defaulting to 10.64.64.64
local
IP address 10.20.52.69
remote IP address 10.64.64.64
primary
DNS address 221.179.38.7
secondary DNS address 120.196.165.7