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/************************************************************************/
/* */
/* File: avr/gpio.c */
/* Description: general purpose input/output driver. */
/* Version: 1.0 */
/* Author: Otto Mattik */
/* */
/* (C)Copyright Otto Mattik 2014-2021. */
/* */
/* This file is a part of 'armen' (a tiny operating system). */
/* 'armen' is distributed under the CeCILL-V2.1 licence. For more */
/* details about this licence, please visit the website cecill.info */
/* */
/************************************************************************/
#ifndef AVR_GPIO_C
#error "do not use this code directly, it must be included via gpio.c"
#endif
#include <stdint.h>
#include <avr/io.h>
#if defined(__AVR_ATtiny84__)
#define GPIO_MAX_PORT 2
#elif defined(__AVR_ATtiny841__)
#define GPIO_MAX_PORT 2
#elif defined(__AVR_ATtiny85__)
#define GPIO_MAX_PORT 1
#elif defined(__AVR_ATtiny1634__)
#define GPIO_MAX_PORT 3
#elif defined(__AVR_ATmega328P__)
#define GPIO_MAX_PORT 3
#elif defined(__AVR_ATmega2560__)
#define GPIO_MAX_PORT 11
#else
#error "no or unavailable cpu defined"
#endif
static struct {
uint8_t* pin;
uint8_t* ddr;
uint8_t* port;
} ports[GPIO_MAX_PORT] = {
#if defined(__AVR_ATtiny84__)\
|| defined(__AVR_ATtiny841__)
{ 0x0039, 0x003A, 0x003B },
{ 0x0036, 0x0037, 0x0038 }
#elif defined(__AVR_ATtiny85__)
{ 0x0016, 0x0017, 0x0018 }
#elif defined(__AVR_ATtiny1634__)
{ 0x002F, 0x0030, 0x0031 },
{ 0x002B, 0x002C, 0x002D },
{ 0x0027, 0x0028, 0x0029 }
#elif defined(__AVR_ATmega328P__)
{ 0x0023, 0x0024, 0x0025 },
{ 0x0026, 0x0027, 0x0028 },
{ 0x0029, 0x002A, 0x002B }
#elif defined(__AVR_ATmega2560__)
{ 0x0020, 0x0021, 0x0022 },
{ 0x0023, 0x0024, 0x0025 },
{ 0x0026, 0x0027, 0x0028 },
{ 0x0029, 0x002A, 0x002B },
{ 0x002C, 0x002D, 0x002E },
{ 0x002F, 0x0030, 0x0031 },
{ 0x0032, 0x0033, 0x0034 },
{ 0x0100, 0x0101, 0x0102 },
{ 0x0104, 0x0104, 0x0105 },
{ 0x0106, 0x0107, 0x0108 },
{ 0x0109, 0x010A, 0x010B }
#endif
};
/*
* read state of a gpio pin
*
* input:
* gpio gpio pin
* output:
* low or high if success, otherwise -1
*/
int8_t gpio_pin_get( uint8_t gpio )
{
#ifdef CHECK_PARAM
if( gpio >= (GPIO_MAX_PORT << 3) )
return( -1 );
#endif
return( (*ports[gpio >> 3].pin >> (gpio & 7)) & 1 );
}
/*
* set state of a gpio pin
*
* input:
* gpio gpio pin
* value low or high
*/
void gpio_pin_set( uint8_t gpio, uint8_t value )
{
#ifdef CHECK_PARAM
if( gpio < (GPIO_MAX_PORT << 3) )
#endif
{
uint8_t port = gpio >> 3;
uint8_t mask = 1 << (gpio & 7);
if( value != 0 )
*ports[gpio >> 3].port |= mask;
else
*ports[gpio >> 3].port &= ~mask;
}
}
/*
* set a gpio pin as input
*
* input:
* gpio gpio pin
*/
void gpio_pin_mode_input( uint8_t gpio )
{
#ifdef CHECK_PARAM
if( gpio < (GPIO_MAX_PORT << 3) )
#endif
*ports[gpio >> 3].ddr &= ~(1 << (gpio & 7));
}
/*
* set a gpio pin as output
*
* input:
* gpio gpio pin
* value initial value, low or high
*/
void gpio_pin_mode_output( uint8_t gpio, uint8_t value )
{
#ifdef CHECK_PARAM
if( gpio < (GPIO_MAX_PORT << 3) )
#endif
{
uint8_t port = gpio >> 3;
uint8_t mask = 1 << (gpio & 7);
if( value != 0 )
*ports[port].port |= mask;
else
*ports[port].port &= ~mask;
*ports[port].ddr |= mask;
}
}
#ifdef USE_ADC
#include "avr/adc.c"
#endif
#ifdef USE_PWM
#include "avr/pwm.c"
#endif
#ifdef USE_PCINT
#include "avr/pcint.c"
#endif
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