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atmega-simon/lib/calc.h

155 lines
4.5 KiB

#pragma once
//
// Bit and byte manipulation utilities
//
#include <stdint.h>
// --- Increment in range ---
// when overflown, wraps within range. Lower bound < upper bound.
// ..., upper bound excluded
#define inc_wrap(var, min, max) \
do { \
if ((var) >= ((max) - 1)) { \
(var) = (min); \
} else { \
(var)++; \
} \
} while(0)
// ..., upper bound included
#define inc_wrapi(var, min, max) inc_wrap((var), (min), (max) + 1)
// --- Decrement in range ---
// when underflown, wraps within range. Lower bound < upper bound.
// ..., upper bound excluded
#define dec_wrap(var, min, max) \
do { \
if ((var) <= (min)) { \
(var) = (max) - 1; \
} else { \
(var)--; \
} \
} while(0)
// ..., upper bound included
#define dec_wrapi(var, min, max) dec_wrap((var), (min), (max) + 1)
// --- Bit manipulation --
// Set bit
#define sbi(reg, n) do { (reg) |= (1 << (uint8_t)(n)); } while(0)
// Clear bit
#define cbi(reg, n) do { (reg) &= ~(1 << (uint8_t)(n)); } while(0)
// Get n-th bit
#define get_bit(reg, n) (((reg) >> (uint8_t)(n)) & 1)
// Test n-th bit (Can't use bit_is_set, as it's defined in sfr_def.h)
#define bit_is_high(reg, n) get_bit((reg), (n))
#define bit_is_low(reg, n) (!get_bit((reg), (n)))
// Write value to n-th bit
#define set_bit(reg, n, val) \
do { \
(reg) = ((reg) & ~(1 << (uint8_t)(n))) \
| (((val) & 1) << (uint8_t)(n)); \
} while(0)
// Invert n-th bit
#define toggle_bit(reg, n) do { (reg) ^= (1 << (uint8_t)(n)); } while(0)
// --- Bit manipulation with pointer to variable ---
// Set n-th bit in pointee
#define sbi_p(reg_p, n) do { (*(reg_p)) |= (1 << (uint8_t)(n)); } while(0)
// Clear n-th bit in pointee
#define cbi_p(reg_p, n) do { (*(reg_p)) &= ~(1 << (uint8_t)(n)); } while(0)
// Get n-th bit in pointee
#define get_bit_p(reg_p, n) ((*(reg_p) >> (uint8_t)(n)) & 1)
// Test n-th bit in pointee (Can't use bit_is_set, as it's redefined in sfr_def.h)
#define bit_is_high_p(reg_p, bit) get_bit_p(reg_p, bit)
#define bit_is_low_p(reg_p, bit) (!get_bit_p(reg_p, bit))
// Write value to a bit in pointee
#define set_bit_p(reg_p, n, value) \
do { \
*(reg_p) = (*(reg_p) & ~(1 << (uint8_t)(n))) \
| (((value) & 1) << (uint8_t)(n)); \
} while(0)
#define toggle_bit_p(reg_p, n) do { *(reg_p) ^= (1 << (uint8_t)(n)); } while(0)
// --- Nibble manipulation ---
// Replace nibble in a byte
#define set_low_nibble(reg, value) \
do { \
(reg) = ((reg) & 0xF0) \
| ((uint8_t)(value) & 0xF); \
} while(0)
#define set_high_nibble(reg, value) \
do { \
(reg) = ((reg) & 0x0F) \
| (((uint8_t)(value) & 0xF) << 4); \
} while(0)
#define set_low_nibble_p(reg_p, value) \
do { \
*(reg_p) = (*(reg_p) & 0xF0) \
| ((uint8_t)(value) & 0xF); \
} while(0)
#define set_high_nibble_p(reg_p, value) \
do { \
*(reg_p) = (*(reg_p) & 0x0F) \
| (((uint8_t)(value) & 0xF) << 4); \
} while(0)
#define low_nibble(x) ((uint8_t)(x) & 0x0F)
#define high_nibble(x) (((uint8_t)(x) & 0xF0) >> 4)
// --- Range tests ---
// Test if X is within low..high, regardless of bounds order
#define in_range(x, low, high) \
((low) < (high) ? ((x) >= (low) && (x) < (high)) \
: ((x) >= (high) && (x) < (low))) \
// ..., include greater bound
#define in_rangei(x, low, high) \
((low) < (high) ? ((x) >= (low) && (x) <= (high)) \
: ((x) >= (high) && (x) <= (low))) \
// Test if X in low..high, wrap around ends if needed.
#define in_range_wrap(x, low, high) \
(((low) < (high)) ? ((x) >= (low) && (x) < (high)) \
: ((x) >= (low) || (x) < (high)))
// ..., include upper bound
#define in_range_wrapi(x, low, high) \
(((low) <= (high)) ? ((x) >= (low) && (x) <= (high)) \
: ((x) >= (low) || (x) <= (high)))