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I. Preface
The day before yesterday, I tested this Artery single-chip microcomputer F421 and encountered a problem. LET'S DEBUG IT USING THE AT-LINK DOWNLOADER YOU JUST GET. Since the original hand-made circuit board has been somewhat damaged, the following is a one-minute board making method to remake the test circuit board. Let's take a look at the specific causes of the problems that preceded the monolithic opportunity.
2. Make a test circuit board
A minute later, the test board was obtained. This circuit board uses double-sided copper clad laminates, and when you check the production of the circuit, you can see that there is a defect in it, and it is repaired by hand below.
Soldering circuit boards. I use a new G8U7 microcontroller, which I also bought from Taobao. The other components are removed from the front test board. Wash and then test. Use the probe clip to connect ATLINK to the microcontroller, and use the AT ICP software to link it. Unfortunately, linking is not possible at this time.
The chip is soldered again. Check the circuit board wiring. However, the microcontroller is still not accessible. It's incredible. Now the static power consumption of the microcontroller is 7mA, I don't know if this value is normal. Because it is a test circuit, the circuit itself is relatively simple. At this point, it is not possible to proceed with the following tests at this time.
At this point, I silently took out the ST-LINK debugger again to see if I could connect to this AT32F421 microcontroller, and I was a little nervous and didn't know what the result would be. If AT-LINK can't connect to a microcontroller, can ST-LINK be connected? The end result can only be described in one word, "magical". It can be connected to an AT32 microcontroller. This means that there is no problem with the board, and the problem is still with the debugger.
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TEST AT-LINK AGAIN, THE FAULT IS STILL THERE. Debugging with the Keil environment, again, is wrong.
The following is to replace an F421 single-chip microcomputer, which should have been sent by Artery technicians yesterday. Something magical happened, and now it can be connected to a microcontroller via ICP. In the Keil environment, it can also be connected to a microcontroller. This can only mean one thing, and that is that the F421 microcontroller I bought is a fake microcontroller.
Next, the microcontroller was debugged using ST-LINK, and it turned out that it could not be connected. Now this can explain one thing, that is, I bought a fake counterfeit microcontroller. On the left is the single-chip microcomputer I bought, and on the right is the single-chip microcomputer sent by Artery technicians. There are significant differences in their chip text. The fake single-chip microcomputer on the left has thick text strokes, and the Yateri single-chip microcomputer on the right has delicate text on the surface, which can only be seen clearly under polarized light. Now the truth is finally revealed.
※Summary※
This article tested the F421G8U7 of Artery's single-chip microcomputer, and the single-chip microcomputer I purchased turned out to be a counterfeit Artery microcomputer used by a bad merchant to use ST microcontroller. The surface text is rough. This incident made me realize the chaos of microcontrollers on the market now.