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50 lines
1.6 KiB
50 lines
1.6 KiB
8 years ago
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Register definitions
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====================
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Those files provide definitions of register addresses and bit field mapping.
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Include the appropriate file using the ` GET 'filename.asm'` directive in your
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main file.
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Example
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-------
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```asm
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; GPIOA base address:
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GPIOA_BASE EQU 0x48000000
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; GPIOA registers:
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GPIOA_MODER EQU (GPIOA_BASE + 0x0) ; GPIO port mode register
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GPIOA_OTYPER EQU (GPIOA_BASE + 0x4) ; GPIO port output type register
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; ...
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; GPIO_MODER fields:
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GPIO_MODER_MODER15 EQU 0xc0000000 ; Port x configuration bits (y = 0..15)
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GPIO_MODER_MODER15_ofs EQU 30
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GPIO_MODER_MODER15_len EQU 2
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GPIO_MODER_MODER14 EQU 0x30000000 ; Port x configuration bits (y = 0..15)
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GPIO_MODER_MODER14_ofs EQU 28
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GPIO_MODER_MODER14_len EQU 2
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; ...
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```
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Registers for a peripheral are named `<peripheral>_<register>`.
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Bit fields are named `<peripheral>_<register>_<field>`, and the field length and offset
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are available in the `_len` and `_ofs` constants.
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Notice how the peripheral is called `GPIOA`, but firlds are named `GPIO_...`. That is because
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all GPIOs have the same register structure, so they also share the same field definitions.
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Generating
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----------
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The definition files are in a large part generated from the CMSIS SVD files, with just a few manual modifications.
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See the `gen/` folder for more info on how this conversion works.
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The register or bit field naming may differ from the datasheet, which is ST's fault. Feel free to correct those mistakes and **submit a pull request**.
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