Fault phenomenon:
The status of the net_status and net_mode lights of the module is not correct. Sometimes the final state of the module is always on, net_status is off, or net_status flashes slowly, and net_mode is off. Sometimes even my application can get a packet of data from the server first, then hang up and never connect again.
Analysis:
These two states are not in the document description. Call on the client, see what you sent, and it will be echoed directly, such as AT+CPIN sending. Direct return, not OK or error, so the preliminary judgment module entered the error state. Then what can make the module enter the error state is nothing more than the following situations:
The posture of sleeping or restarting is wrong.
Or my application code killed the module before it was initialized. However, the previous development with EC600S is still good, and the general application code can't make the module enter the error state, which is relatively low.
Check:
In the second case, the investigation is very simple. Let's look at the application software first. The fault remains, continue to check 1.
In the driver package of EC200, the boot pin, status pin and sleep pin need to be configured. No matter what is developed, the sleep state is the most prone to problems, including x86 development and usb device development. This situation is not uncommon, so sleep (-1) is removed first, but the fault still exists.
At first, I never doubted the status pin because it is an input. I just judge whether the module is on or not, and I feel that there will be no problem, so I haven't moved it. Until I saw a buddy with a similar problem:
Network exception bug caused by RT-Thread-at_device not using power pin rt-thread Q&A community -RT-Thread.
In fact, I seem to have encountered this problem when I used EC600S before, but I didn't use ping and the application was fine, so I didn't care. But I can try this reminder, so I changed the boot state to-1, and that's all.
I didn't touch the power plug. The module needs to have a startup sequence. I think its initialization code is similar to disabling the power supply pin and restarting it.
I hope other friends who have fallen into the pit can see my post and take less detours.
Open CSDN for a better reading experience.
Quectel_EC600S series _TCP(IP)_ application guide _V 1.2.rar
The EC600S-CN module has built-in TCP/IP protocol stack, and the host can directly access the network through AT command. This greatly reduces the dependence of the module on PPP and external TCP/IP protocol stack, thus reducing the cost of terminal design.
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Due to the high power consumption of Cat.4 module (EC20), considering the NB network coverage problem (equipment working in the field), Cat. 1(EC600N) module is selected for the project. Now summarize the debugging process, hoping to help everyone. For a summary of the use of EC20, please refer to: Communication Summary between Single Chip Microcomputer and 4G Module (EC20). First, the power manual says that the power supply voltage is ≥3.4V and the peak current is 3A. Second, the UART and IO ports of the communication port are both 1.8V, and the level must be changed. III. Boot sequence I: Reset after powering on 1s, reset the low level for 600ms, boot after 100ms, and wait for 10s to run. Four. AT instruction adopts message body principle. See for details.
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ESP32+ remote EC600N module connects to Alibaba Cloud through MQTT and upgrades OTA through HTTP. The following is my work during this period, sharing my research results, and also letting my friends behind me step on the pit less. At the same time, record the operation steps through the article, so as not to forget for a while. The following is the detailed debugging information output of data interaction between ESP32 and EC600N module through serial port. ...
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EC600U
Ec600u, tcp client disconnects and reconnects.
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The latest release of STM32+USART+DMA+EC600N debugging.
In stm32Cube, turn on DMA to send and receive interrupts, and turn on usart global interrupt. Main debugging functions: (1) sending fixed-length data to serial port by DMA, (2) receiving indefinite-length frame data by DMA. (1) Use DMA transmission to send data with fixed size, and replace it with packing code as follows: (2) Use DMA transmission to receive data with variable size, and use serial port idle interrupt to identify a frame of data. Reference link: Note: Remember to restart DMA reception after the idle interrupt is over. The instructions of AT execution logic analyze the success of each AT instruction, and then move on to the next one. If this AT instruction fails to execute, it will be executed repeatedly, at most 10 times. If 10 all fails, this round is over.
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