76 lines
2.3 KiB
Markdown
76 lines
2.3 KiB
Markdown
Python code conventions
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=======================
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Python code follows [PEP 8](http://legacy.python.org/dev/peps/pep-0008/).
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Naming conventions:
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- Module names are short and all lowercase; eg pyb, stm.
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- Class names are CamelCase, with abreviations all uppercase; eg I2C, not
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I2c.
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- Function and method names are all lowercase with words separated by
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a single underscore as necessary to improve readability; eg mem_read.
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- Constants are all uppercase with words separated by a single underscore;
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eg GPIO_IDR.
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C code conventions
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==================
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When writing new C code, please adhere to the following conventions.
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White space:
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- Expand tabs to 4 spaces.
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- Don't leave trailing whitespace at the end of a line.
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- For control blocks (if, for, while), put 1 space between the
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keyword and the opening parenthesis.
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- Put 1 space after a comma, and 1 space around operators.
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Braces:
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- Use braces for all blocks, even no-line and single-line pieces of
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code.
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- Put opening braces on the end of the line it belongs to, not on
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a new line.
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- For else-statements, put the else on the same line as the previous
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closing brace.
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Header files:
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- Try to stick to the Plan 9 header style, where header files do not
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include other header files.
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- Don't protect a header file from multiple inclusion with #if directives.
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Type names and declarations:
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- When defining a type, put '_t' after it.
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Integer types: Micro Python runs on 32 and 64 bit machines (and one day
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maybe 16 bit), so it's important to use the correctly-sized (and signed)
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integer types. The general guidelines are:
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- For most cases use mp_int_t for signed and mp_uint_t for unsigned
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integer values. These are guaranteed to be machine-word sized and
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therefore big enough to hold the value from a Micro Python small-int
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object.
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- Use size_t for things that count bytes / sizes of objects.
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- You can use int/uint, but remember that they may be 16-bits wide.
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- If in doubt, use mp_int_t/mp_uint_t.
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Examples
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--------
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Braces and spaces:
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int foo(int x, int y) {
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if (x < y) {
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foo(y, x);
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} else {
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foo(x + 1, y - 1);
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}
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for (int i = 0; i < x; i++) {
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}
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}
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Type declarations:
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typedef struct _my_struct_t {
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int member;
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void *data;
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} my_struct_t;
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