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.
87 lines
3.6 KiB
87 lines
3.6 KiB
#pragma once
|
|
|
|
//
|
|
// Bit and byte manipulation utilities
|
|
//
|
|
|
|
|
|
// --- 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, bit) do { (reg) |= (1 << (uint8_t)(bit)); } while(0)
|
|
|
|
// Clear bit
|
|
#define cbi(reg, bit) do { (reg) &= ~(1 << (uint8_t)(bit)); } while(0)
|
|
|
|
// Get n-th bit
|
|
#define get_bit(reg, bit) (((reg) >> (uint8_t)(bit)) & 0x1)
|
|
|
|
// Test n-th bit (Can't use bit_is_set, as it's redefined in sfr_def.h)
|
|
#define bit_is_high(reg, bit) get_bit(reg, bit)
|
|
#define bit_is_low(reg, bit) (!get_bit(reg, bit))
|
|
|
|
// Write value to n-th bit
|
|
#define set_bit(reg, bit, value) do { (reg) = ((reg) & ~(1 << (uint8_t)(bit))) | (((uint8_t)(value) & 0x1) << (uint8_t)(bit)); } while(0)
|
|
|
|
// Invert n-th bit
|
|
#define toggle_bit(reg, bit) do { (reg) ^= (1 << (uint8_t)(bit)); } while(0)
|
|
|
|
|
|
// --- Bit manipulation with pointer to variable ---
|
|
|
|
// Set n-th bit in pointee
|
|
#define sbi_p(reg_p, bit) do { (*(reg_p)) |= (1 << (uint8_t)(bit)); } while(0)
|
|
// Clear n-th bit in pointee
|
|
#define cbi_p(reg_p, bit) do { (*(reg_p)) &= ~(1 << (uint8_t)(bit)); } while(0)
|
|
|
|
// Get n-th bit in pointee
|
|
#define get_bit_p(reg_p, bit) ((*(reg_p) >> (uint8_t)(bit)) & 0x1)
|
|
|
|
// 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, bit, value) do { *(reg_p) = (*(reg_p) & ~(1 << ((uint8_t)(bit) & 0x1))) | (((uint8_t)(value) & 0x1) << (uint8_t)(bit)); } while(0)
|
|
#define toggle_bit_p(reg_p, bit) do { *(reg_p) ^= (1 << (uint8_t)(bit)); } 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) & 0xF)
|
|
#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))) || (((low) > (high)) && ((x) >= (high) && (x) < (low))))
|
|
// ..., include greater bound
|
|
#define in_rangei(x, low, high) ((((low) <= (high)) && ((x) >= (low) && (x) <= (high))) || (((low) > (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))) || (((low) > (high)) && ((x) >= (low) || (x) < (high))))
|
|
// ..., include upper bound
|
|
#define in_range_wrapi(x, low, high) ((((low) <= (high)) && ((x) >= (low) && (x) <= (high))) || (((low) > (high)) && ((x) >= (low) || (x) <= (high))))
|
|
|