NB-IOT column list
Chuangsi Communication BC28 core board + STM32F series microcontroller development record blog
1. BC28 module test
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Preface
The process of self-learning new things is very painful, especially in terms of hardware. Each manufacturer may make different modules, or the corresponding master chip used in the tutorials given by the manufacturer. Sometimes the documentation provided by the manufacturer I may not understand, and there are not many information on the Internet. It may be a pit for the novice Xiaobai. It is very daunting. There is no way. I can only think and study bit by bit. Then this column will write a summary of NBIOT. , The BC28 module of Chuangsi Communication is used here, which is the core board of NB-IOT. The tutorial given by the boss is made with STM32 L series single-chip microcomputer. Those students who have studied STM32 may be the same as me. There is only For STM32f series boards, there are many different things involved in different boards. So I searched and searched on Baidu and joined the seller's technical support group, which was still a bit daunting. The core board I bought is as shown in the picture below. If you see this picture is the same as yours, you can continue to read my post below. It is definitely helpful.
1. My confusion and answers
1. The seller gave a tutorial for the L series MCU. Can I use the F series MCU? Do I need to buy the L series MCU myself?
F-series single-chip microcomputers are possible. There is only serial communication between the single-chip microcomputer and the BC28. As long as it is a single-chip microcomputer, serial communication can be performed. Sending AT commands can make the BC28 work, so there is no need to buy an L-series single-chip microcomputer. , You can buy L series MCU, but the code of F series needs to be written by yourself, so you need to know STM32 yourself.
2. What is the difference between L series and F series MCU?
The characteristic of NBIOT is low power consumption, while the characteristic of L series single-chip microcomputer is also low power consumption. In contrast, the F series is not very suitable, but it is completely possible for students to learn to use the F series single-chip by doing experiments by themselves.
3. The test video provided by the boss uses a serial cable, but there is no serial cable (the plug-in type), only the USB mini port data cable, what should I do?
The boss’s video does use a serial download cable. Observe carefully. There is a U port on the board, but it is not a serial port. If you use a serial port, you need to connect a serial cable. Then I have a USB to TTL data cable, without TX and RX, I did this. I plugged the data line into the 32 board of Wildfire, and connected the two pins (RXD TXD) of the board with the serial port to 32 to the BC28 (RX TX) and powered it. It succeeded Solve the problem of no serial line.
The physical picture of the serial port connection is as shown in the figure below: (At the same time, don’t forget to connect vcc and gnd to the BC28)
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Steps to test the BC module
1. Use Huawei HiSilicon debugging tool
Find the following software
Open this software
2. Test process
(1) Set the port,
select your own port number in setting->Serial port parameter set , and adjust the baud rate to 9600.
(2) Click the following three buttons respectively, if yours is the same as mine, it will be fine.
The first button is to connect to BC28, the second is the information of BC28, and the third is whether BC28 is registered (determine whether your BC28 can communicate)
3. Problems encountered and solutions
Click Registration information and Not Registere appears.
1. Make sure that your card is inserted correctly. Note that the notch of the card faces outwards and the metal surface of the card fits the board.
2. Click Module information to check whether NBAND is 8 or not, because the NB card used by China Mobile must be set to 8. The setting command is as follows, remember to bring Enter
AT+NBAND=8
