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54 lines
1.8 KiB
Markdown
54 lines
1.8 KiB
Markdown
# Electronics
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Some basic tipe for new embedded Eletronics programmers
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## Use of DDx, PORT and PIN registers:
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- **DDx**: Choice of pins state: Inputs or Outputs
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- **PORT**: Set the outputs state, rules the outputs (ex : set Pin to 0)
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- **PIN**: Reads the inputs states, or toggle values. (ex: Toogle Pin)
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## Easily set a bit to 0 in a register:
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PPR=PPR & 0b01111111
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## Easily set a bit to 1 in a register:
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PPR=PPR & 0b01111111
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## Debug hardware errors after optimization:
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In case your C code does not work any more after Optimization (-O2 -O3)
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- Check if global variables are used in interruptions
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- Try to set them as volatile
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## Hazardous hardware resets:
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**Check if your interruptions are initialized in your code !**
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Otherwise, the C code will automatically jump to a non-existing address, causing the reset.
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## I/O problems:
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In case of I/O problems in your code, **check your Hardware and especially your resistors**
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Try to unsolder them and run the code.
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## Embedded electronics main architecture code:
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Generally, embedded architecture software is divided into 3 main layers :
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- **Drivers:** Whose job is to interact with Hardware at a low level (Ex : Read spi data)
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- **Services/Components:** Intermediate layer, interface between drivers and Applications
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- **Application:** Higher layer, which aims at achieving the main purpose of the project (Ex: Calculate movement using an accelerometer)
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Here is a simple drawing to get the idea:
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__**NOTE:**__ The main idea behind that when you code is the reuse! The application may not be reusable, but drivers and components must !
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If you did good, you should be able to use **the same application** in two architectures, **changing only components and drivers**.
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