85 lines
2.6 KiB
Markdown
85 lines
2.6 KiB
Markdown
Python code conventions
|
|
=======================
|
|
|
|
Python code follows [PEP 8](http://legacy.python.org/dev/peps/pep-0008/).
|
|
|
|
Naming conventions:
|
|
- Module names are short and all lowercase; eg pyb, stm.
|
|
- Class names are CamelCase, with abreviations all uppercase; eg I2C, not
|
|
I2c.
|
|
- Function and method names are all lowercase with words separated by
|
|
a single underscore as necessary to improve readability; eg mem_read.
|
|
- Constants are all uppercase with words separated by a single underscore;
|
|
eg GPIO_IDR.
|
|
|
|
C code conventions
|
|
==================
|
|
|
|
When writing new C code, please adhere to the following conventions.
|
|
|
|
White space:
|
|
- Expand tabs to 4 spaces.
|
|
- Don't leave trailing whitespace at the end of a line.
|
|
- For control blocks (if, for, while), put 1 space between the
|
|
keyword and the opening parenthesis.
|
|
- Put 1 space after a comma, and 1 space around operators.
|
|
|
|
Braces:
|
|
- Use braces for all blocks, even no-line and single-line pieces of
|
|
code.
|
|
- Put opening braces on the end of the line it belongs to, not on
|
|
a new line.
|
|
- For else-statements, put the else on the same line as the previous
|
|
closing brace.
|
|
|
|
Header files:
|
|
- Header files should be protected from multiple inclusion with #if
|
|
directives. See an existing header for naming convention.
|
|
|
|
Names:
|
|
- Use underscore_case, not camelCase for all names.
|
|
- Use CAPS_WITH_UNDERSCORE for enums and macros.
|
|
- When defining a type use underscore_case and put '_t' after it.
|
|
|
|
Integer types: Micro Python runs on 16, 32, and 64 bit machines, so it's
|
|
important to use the correctly-sized (and signed) integer types. The
|
|
general guidelines are:
|
|
- For most cases use mp_int_t for signed and mp_uint_t for unsigned
|
|
integer values. These are guaranteed to be machine-word sized and
|
|
therefore big enough to hold the value from a Micro Python small-int
|
|
object.
|
|
- Use size_t for things that count bytes / sizes of objects.
|
|
- You can use int/uint, but remember that they may be 16-bits wide.
|
|
- If in doubt, use mp_int_t/mp_uint_t.
|
|
|
|
Comments:
|
|
- Be concise and only write comments for things that are not obvious.
|
|
- Use `// ` prefix, NOT `/* ... */`. No extra fluff.
|
|
|
|
Examples
|
|
--------
|
|
|
|
Braces, spaces, names and comments:
|
|
|
|
#define TO_ADD (123)
|
|
|
|
// This function will always recurse indefinitely and is only used to show
|
|
// coding style
|
|
int foo_function(int x, int some_value) {
|
|
if (x < some_value) {
|
|
foo(some_value, x);
|
|
} else {
|
|
foo(x + TO_ADD, some_value - 1);
|
|
}
|
|
|
|
for (int my_counter = 0; my_counter < x; my_counter++) {
|
|
}
|
|
}
|
|
|
|
Type declarations:
|
|
|
|
typedef struct _my_struct_t {
|
|
int member;
|
|
void *data;
|
|
} my_struct_t;
|