You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
154 lines
4.5 KiB
154 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)))
|
|
|