Enum as Bit Flags

Enum as Bit Flags

Define an enum for device status flags and implement two functions:

- `set_flag(status, flag)` — sets a flag, returns new status

- `has_flag(status, flag)` — returns 1 if flag is set, 0 otherwise

typedef enum {

FLAG_NONE = 0,

FLAG_READY = (1 << 0),

FLAG_BUSY = (1 << 1),

FLAG_ERROR = (1 << 2),

FLAG_OVERFLOW = (1 << 3),

} DeviceFlags;

Why it matters: Hardware registers are made of bit flags. You'll use this every single day writing embedded firmware.