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130 lines
3.6 KiB
130 lines
3.6 KiB
10 years ago
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#pragma once
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//
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// This file provides macros for pin manipulation.
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//
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// You can define your application pins like so:
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//
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// // Led at PORTB, pin 1
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// #define LED B,1
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//
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// // Switch at PORTD, pin 7
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// #define SW1 D,7
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//
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// Now you can use macros from this file to wirh with the pins, eg:
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//
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// as_output(LED);
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// as_input(SW1);
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// pullup_on(SW1);
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//
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// toggle_pin(LED);
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// while (pin_is_low(SW1));
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//
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// - The macros io2XXX() can be used to get literal name of register associated with the pin.
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// - io2n() provides pin number.
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// - The underscored and _aux macros are internal and should not be used elsewhere.
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// - The io_pack() macro is used to pass pin (io) to other macro without expanding it.
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//
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#include <avr/io.h>
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#include "calc.h"
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// Helpers
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// Get particular register associated with the name X (eg. D -> PORTD)
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#define _reg_ddr(X) DDR ## X
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#define _reg_port(X) PORT ## X
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#define _reg_pin(X) PIN ## X
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#define _io2ddr_aux(reg, bit) _reg_ddr(reg)
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#define _io2port_aux(reg, bit) _reg_port(reg)
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#define _io2pin_aux(reg, bit) _reg_pin(reg)
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#define _io2n_aux(reg, bit) bit
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// === Convert A,1 to corresponding register and pin number ===
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#define io2ddr(io) _io2ddr_aux(io)
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#define io2port(io) _io2port_aux(io)
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#define io2pin(io) _io2pin_aux(io)
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#define io2n(io) _io2n_aux(io)
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// === covert "A", "1" to "A,1" for passing on to another macro ===
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#define io_pack(port, bit) port, bit
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// === Useful types for ports and pins ===
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// pointer to port
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typedef volatile uint8_t* PORT_P;
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// number of bit in port
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typedef uint8_t BIT_N;
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// === pin manipulation ===
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// Helpers
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#define _set_pin_aux(port, bit) sbi(_reg_port(port), (bit))
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#define _clear_pin_aux(port, bit) cbi(_reg_port(port), (bit))
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#define _read_pin_aux(port, bit) get_bit(_reg_pin(port), (bit))
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#define _write_pin_aux(port, bit, value) set_bit(_reg_port(port), (bit), (value))
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#define _toggle_pin_aux(port, bit) sbi(_reg_pin(port), (bit))
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// Set pin to HIGH
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#define pin_up(io) _set_pin_aux(io)
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#define pin_high(io) _set_pin_aux(io)
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// Set pin to LOW
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#define pin_down(io) _clear_pin_aux(io)
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#define pin_low(io) _clear_pin_aux(io)
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// Get input pin value
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#define get_pin(io) _read_pin_aux(io)
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#define read_pin(io) _read_pin_aux(io)
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// Check if pin is low or high
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#define pin_is_low(io) !_read_pin_aux(io)
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#define pin_is_high(io) _read_pin_aux(io)
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// Write a value to pin
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#define set_pin(io, value) _write_pin_aux(io, (value))
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#define write_pin(io, value) _write_pin_aux(io, (value))
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#define toggle_pin(io) _toggle_pin_aux(io)
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// === Setting pin direction ===
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// Helpers
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#define _as_input_aux(port, bit) cbi(_reg_ddr(port), (bit))
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#define _as_output_aux(port, bit) sbi(_reg_ddr(port), (bit))
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#define _set_dir_aux(port, bit, dir) write_bit(_reg_ddr(port), (bit), (dir))
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// Pin as input (_pu ... with pull-up)
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#define as_input(io) _as_input_aux(io)
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#define as_input_pu(io) do { _as_input_aux(io); _pullup_enable_aux(io); } while(0)
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// Pin as output
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#define as_output(io) _as_output_aux(io)
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// Set direction (1 ... output)
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#define set_dir(io, dir) _set_dir_aux(io, (dir))
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// === Setting pullup ===
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// Helpers
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#define _pullup_enable_aux(port, bit) sbi(_reg_port(port), (bit))
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#define _pullup_disable_aux(port, bit) cbi(_reg_port(port), (bit))
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#define _set_pullup_aux(port, bit, on) write_bit(_reg_port(port), (bit), (on))
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// Enable pullup
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#define pullup_enable(io) _pullup_enable_aux(io)
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#define pullup_on(io) _pullup_enable_aux(io)
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// Disable pullup
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#define pullup_disable(io) _pullup_disable_aux(io)
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#define pullup_off(io) _pullup_disable_aux(io)
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// Set pullup to value (1 ... pullup enabled)
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#define set_pullup(io, on) _set_pullup_aux(io, on)
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