SIM7500_SIM7600 系列模塊的 USB VID 是 0x1E0E PID 是 0x9001.
作為 Slave USB 設備，配置如下表
USB 接口波特率自適應 9600、115200 都可以
TTL 串口默認 115200 波特率
|
Interface number
|
 |
|
|
0
|
USB serial
|
Diagnostic Interface
|
|
1
|
USB serial
|
GPS NMEA Interface
|
|
2
|
USB serial
|
AT port Interface
|
|
3
|
USB serial
|
Modem port Interface
|
|
4
|
USB serial
|
USB Audio Interface
|
|
5
|
USB RMNet
|
wwan interface
|
|
6
|
adb
|
Android adb debug port
|
在 linux 系統中 要防止 USB serial 驅動也把 Net interface 枚舉占用。二 USB 串口驅動使用
- 1 USB Serial 的內核配置支持在 linux 內核配置中(/target/linux/ramips/mt7688/config-3.18)，請確保
CONFIG_USB_SERIAL=y - CONFIG_USB_SERIAL_WWAN=y
- CONFIG_USB_SERIAL_OPTION=y
- 2 修改驅動代碼增加 SIM7500_SIM7600 的 VID/PID 並且跳過 Interface 5找到內核源碼文件 option.c(路徑在 build_dir/target-mi
- psel_24kec+dsp_uClibc-0.9.33.2/linux-ramips_mt7688/linux-3.18.29/drivers/usb/ser
- ial/option.c)
#define SIMCOM_SIM7600_VID 0x1E0E
#define SIMCOM_SIM7600_PID 0x9001
在 option_ids 列表中增加
{ USB_DEVICE(SIMCOM_SIM7600_VID, SIMCOM_SIM7600_PID)}, /*SIM7600 */並且在 option_probe 里過濾掉 interface 5
/* sim7600 */
if (dev_desc->idVendor == SIMCOM_SIM7600_VID &&
dev_desc->idProduct == SIMCOM_SIM7600_PID && iface_desc->bInterfaceNumber == 5 )return -ENODEV;
配置選擇：
//這個不一定有
NetWork >>
wwan .....................GenericOpenWrt 3G/4G proto handler
//這個一定有
Kernel modules >>
USB Support >>
Kmod -usb-core
Kmod -usb-net
>> kmod-usb-net-qmi-wwan
Kmod-usb-ohci //這個選項一定要勾選，否則可能無法在系統中查看設備
Kmod-usb-serial
Kmod-usb-serial-option
Kmod-usb-serial-wwan
kmod-usb-uhci
Kmod-usb2
3 內核調試信息打印
如果驅動正確編譯到內核，內核開機找到模塊后，會打印如下信息
usb 1‐1: new high speed USB device using rt3xxx‐ehci and address 2option 1‐1:1.0: GSM modem (1‐port) converter detected
usb 1‐1: GSM modem (1‐port) converter now attached to ttyUSB0option 1‐1:1.1: GSM modem (1‐port) converter detected
usb 1‐1: GSM modem (1‐port) converter now attached to ttyUSB1
option 1‐1:1.2: GSM modem (1‐port) converter detected
usb 1‐1: GSM modem (1‐port) converter now attached to ttyUSB2option 1‐1:1.3: GSM modem (1‐port) converter detected
usb 1‐1: GSM modem (1‐port) converter now attached to ttyUSB3option 1‐1:1.4: GSM modem (1‐port) converter detected
usb 1‐1: GSM modem (1‐port) converter now attached to ttyUSB4
dev/ttyUSB0~4 就會生成，上層應用就可以通過這些設備和模塊交互了(發送AT 命令等)。
經測試 可用