Taking the microcontroller P1 register as an example, there are two arrangements:
The first type: P1^7 is high, that is:
P1^7 P1^6 P1^5 P1^4 P1^3 P1^2 P1^1 P1^0
The second type: P1^0 is high, that is:
P1^0 P1^1 P1^2 P1^3 P1^4 P1^5 P1^6 P1^7
The above two arrangements are always confusing for novices, who don’t know which one is correct. Therefore, the running light test code can be used for verification.
Use the CT107D development board to verify the running light function.
The reference code link is: http://download.csdn.net/download/qq_34706280/10260235
It turns out that the correct arrangement of the microcontroller pins is:
The first type: P1^7 is high, that is:
P1^7 P1^6 P1^5 P1^4 P1^3 P1^2 P1^1 P1^0
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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