219 lines
4.2 KiB
C
219 lines
4.2 KiB
C
/*
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u8g_com_io.c
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abstraction layer for low level i/o
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Universal 8bit Graphics Library
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Copyright (c) 2012, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "u8g.h"
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#if defined(__AVR__)
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#include <avr/interrupt.h>
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#include <avr/io.h>
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typedef volatile uint8_t * IO_PTR;
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/* create internal pin number */
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uint8_t u8g_Pin(uint8_t port, uint8_t bitpos)
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{
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port <<= 3;
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port += bitpos;
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return port;
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}
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const IO_PTR u8g_avr_ddr_P[] PROGMEM = {
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#ifdef DDRA
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&DDRA,
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#else
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0,
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#endif
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&DDRB,
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#ifdef DDRC
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&DDRC,
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#ifdef DDRD
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&DDRD,
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#ifdef DDRE
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&DDRE,
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#ifdef DDRF
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&DDRF,
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#ifdef DDRG
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&DDRG,
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#ifdef DDRH
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&DDRH,
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#endif
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#endif
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#endif
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#endif
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#endif
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#endif
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};
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const IO_PTR u8g_avr_port_P[] PROGMEM = {
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#ifdef PORTA
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&PORTA,
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#else
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0,
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#endif
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&PORTB,
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#ifdef PORTC
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&PORTC,
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#ifdef PORTD
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&PORTD,
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#ifdef PORTE
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&PORTE,
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#ifdef PORTF
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&PORTF,
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#ifdef PORTG
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&PORTG,
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#ifdef PORTH
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&PORTH,
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#endif
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#endif
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#endif
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#endif
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#endif
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#endif
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};
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const IO_PTR u8g_avr_pin_P[] PROGMEM = {
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#ifdef PINA
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&PINA,
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#else
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0,
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#endif
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&PINB,
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#ifdef PINC
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&PINC,
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#ifdef PIND
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&PIND,
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#ifdef PINE
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&PINE,
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#ifdef PINF
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&PINF,
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#ifdef PING
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&PING,
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#ifdef PINH
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&PINH,
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#endif
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#endif
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#endif
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#endif
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#endif
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#endif
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};
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static volatile uint8_t *u8g_get_avr_io_ptr(const IO_PTR *base, uint8_t offset)
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{
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volatile uint8_t * tmp;
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base += offset;
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memcpy_P(&tmp, base, sizeof(volatile uint8_t * PROGMEM));
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return tmp;
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}
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/* set direction to output of the specified pin (internal pin number) */
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void u8g_SetPinOutput(uint8_t internal_pin_number)
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{
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*u8g_get_avr_io_ptr(u8g_avr_ddr_P, internal_pin_number>>3) |= _BV(internal_pin_number&7);
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}
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void u8g_SetPinInput(uint8_t internal_pin_number)
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{
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*u8g_get_avr_io_ptr(u8g_avr_ddr_P, internal_pin_number>>3) &= ~_BV(internal_pin_number&7);
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}
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void u8g_SetPinLevel(uint8_t internal_pin_number, uint8_t level)
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{
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volatile uint8_t * tmp = u8g_get_avr_io_ptr(u8g_avr_port_P, internal_pin_number>>3);
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if ( level == 0 )
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*tmp &= ~_BV(internal_pin_number&7);
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else
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*tmp |= _BV(internal_pin_number&7);
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}
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uint8_t u8g_GetPinLevel(uint8_t internal_pin_number)
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{
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volatile uint8_t * tmp = u8g_get_avr_io_ptr(u8g_avr_pin_P, internal_pin_number>>3);
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if ( ((*tmp) & _BV(internal_pin_number&7)) != 0 )
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return 1;
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return 0;
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}
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#else
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uint8_t u8g_Pin(uint8_t port, uint8_t bitpos)
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{
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port <<= 3;
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port += bitpos;
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return port;
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}
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void u8g_SetPinOutput(uint8_t internal_pin_number)
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{
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}
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void u8g_SetPinInput(uint8_t internal_pin_number)
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{
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}
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void u8g_SetPinLevel(uint8_t internal_pin_number, uint8_t level)
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{
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}
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uint8_t u8g_GetPinLevel(uint8_t internal_pin_number)
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{
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return 0;
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}
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#endif
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void u8g_SetPIOutput(u8g_t *u8g, uint8_t pi)
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{
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uint8_t pin;
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pin = u8g->pin_list[pi];
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if ( pin != U8G_PIN_NONE )
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u8g_SetPinOutput(pin);
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}
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void u8g_SetPILevel(u8g_t *u8g, uint8_t pi, uint8_t level)
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{
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uint8_t pin;
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pin = u8g->pin_list[pi];
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if ( pin != U8G_PIN_NONE )
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u8g_SetPinLevel(pin, level);
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}
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