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41 lines
1.9 KiB
41 lines
1.9 KiB
10 years ago
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#pragma once
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/**
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General purpose calculation and bit manipulation utilities.
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*/
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// if max, go to zero. Else increment.
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#define inc_wrap(var, max) do { if ((var) >= (max)) { (var)=0; } else { (var)++; } } while(0)
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// If zero, go to max. Else decrement,
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#define dec_wrap(var, max) do { if ((var) > 0) { (var)--; } else { (var)=(max); } } while(0)
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// Check if value is in range A..B or B..A
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#define in_range(x, low, high) (((low) < (high)) && ((x) > (low) && (x) < (high))) || (((low) > (high)) && ((x) < (low) || (x) > (high)))
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// Check if value is in range A..B. If B < A, matches all outside B..A
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#define in_range_wrap(x, low, high) (((low) < (high)) && ((x) > (low) && (x) < (high))) || (((low) > (high)) && ((x) > (low) || (x) < (high)))
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// === general bit manipulation with register ===
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#define sbi(reg, bit) do { (reg) |= (1 << (uint8_t)(bit)); } while(0)
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#define cbi(reg, bit) do { (reg) &= ~(1 << (uint8_t)(bit)); } while(0)
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#define read_bit(reg, bit) ((((uint8_t)(reg)) >> (uint8_t)(bit)) & 0x1)
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#define get_bit(reg, bit) read_bit(reg, bit)
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#define write_bit(reg, bit, value) do { (reg) = ((reg) & ~(1 << (uint8_t)(bit))) | (((uint8_t)(value) & 0x1) << (uint8_t)(bit)); } while(0)
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#define set_bit(reg, bit, value) write_bit(reg, bit, value)
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#define toggle_bit(reg, bit) do { (reg) ^= (1 << (uint8_t)(bit)); } while(0)
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// general pin manipulation - with pointer to register
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#define sbi_p(reg_p, bit) do { (*(reg_p)) |= (1 << (uint8_t)(bit)); } while(0)
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#define cbi_p(reg_p, bit) do { (*(reg_p)) &= ~(1 << (uint8_t)(bit)); } while(0)
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#define read_bit_p(reg_p, bit) ((*(reg_p) >> (uint8_t)(bit)) & 0x1)
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#define get_bit_p(reg_p, bit) read_bit_p(reg_p, bit)
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#define write_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)
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#define set_bit_p(reg, bit, value) write_bit_p(reg_p, bit, value)
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#define toggle_bit_p(reg_p, bit) do { *(reg_p) ^= (1 << (uint8_t)(bit)); } while(0)
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