[Beijing Xunwei] i.MX6ULL Terminator Linux 4G communication experiment 4G network connection

For embedded Linux, 4G network connection is a relatively easy function to implement. Most 4G module interfaces are MiniPCIE interfaces, but a closer look will reveal that the communication interfaces of 4G modules are all USB, so the 4G module The driver is a USB driver. As long as the USB driver is normal, the 4G module can communicate normally on the hardware. Let's take a look at the hardware schematic diagram of the 4G module:

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In the schematic diagram, U25 is the MiniPCIE interface of the 4G module, and then the communication pins will be connected to the HUB chip of U15, so the 4G module will be recognized as a USB device, and CON5 is the SIM card interface. When using the 4G module, you need to first Insert the SIM card. The EC20 4G module used on the i.MX6UL Terminator development board is shown in Figure 3:

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