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/*
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dio.c
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Controls digital input and output
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A general note on how this code works:
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portpin is used to select both the bank and which pin is selected
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6 bits are used (lower 6, ex: 0b00abcdef)
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the first 3 (abc in this example) are used to select the bank
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A = 001
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B = 010
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C = 011
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D = 100
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E = 101
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F = 110
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G = 111
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the bank can be found by doing portpin >> 3
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the next 3 (def in this example) are used to select the pin number
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the 3 bits are just the binary representation of the pin number
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0 = 000
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1 = 001
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2 = 010
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3 = 011
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4 = 100
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5 = 101
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6 = 110
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7 = 111
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the pin number can be found by doing portping & 0b111
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*/
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#include <avr/interrupt.h> |
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#include <dio.h> |
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#include <time.h> |
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#include <lights.h> |
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/*
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digital_input
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reads the value on the selected portpin, returns it as 1 or 0
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see general description (above) for definition of portpin
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*/
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int digital_input(int portpin){ |
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int pin = portpin & 0x7; |
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int pin_val = 0; |
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switch(portpin >> 3){ |
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case _PORT_A:
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DDRA &= ~_BV(pin); |
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pin_val = PINA; |
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return (pin_val >> pin) & 1; |
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case _PORT_B:
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DDRB &= ~_BV(pin); |
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pin_val = PINB; |
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return (pin_val >> pin) & 1; |
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case _PORT_C:
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DDRC &= ~_BV(pin); |
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pin_val = PINC; |
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return (pin_val >> pin) & 1; |
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case _PORT_D:
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DDRD &= ~_BV(pin); |
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pin_val = PIND; |
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return (pin_val >> pin) & 1; |
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case _PORT_E:
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DDRE &= ~_BV(pin); |
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pin_val = PINE; |
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return (pin_val >> pin) & 1; |
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case _PORT_F:
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if(pin>=4){ |
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MCUSR|=1<<7; |
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MCUSR|=1<<7; |
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} |
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DDRF &= ~_BV(pin); |
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pin_val = PINF; |
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return (pin_val >> pin) & 1; |
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case _PORT_G:
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DDRG &= ~_BV(pin); |
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pin_val = PING; |
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return (pin_val >> pin) & 1; |
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default: break; |
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} |
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return -1; |
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} |
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/*
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digital_pull_up
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Enables pullup on a pin. if pin is output, it will make it output 1.
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*/
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void digital_pull_up(int portpin) { |
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int pins = portpin & 0x07; |
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switch(portpin >> 3) { |
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case _PORT_A:
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PORTA |= _BV(pins); |
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break;
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case _PORT_B:
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PORTB |= _BV(pins); |
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break;
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case _PORT_C:
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PORTC |= _BV(pins); |
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break;
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case _PORT_D:
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PORTD |= _BV(pins); |
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break;
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case _PORT_E:
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PORTE |= _BV(pins); |
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break;
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case _PORT_F:
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PORTF |= _BV(pins); |
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break;
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case _PORT_G:
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PORTG |= _BV(pins); |
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break;
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} |
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} |
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/*
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digital_output
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sets portpin to the value
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see general description above for explanation of portpin
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val can only be 0 for off, nonzero for on
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*/
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void digital_output(int portpin, int val) { |
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int pins = portpin & 0x07; |
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/*
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if you want to set to 0
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*/
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if(val == 0) { |
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switch(portpin >> 3) { |
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case _PORT_A:
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DDRA |= _BV(pins); |
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PORTA &= (0XFF - _BV(pins));
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break;
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case _PORT_B:
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DDRB |= _BV(pins); |
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PORTB &= (0XFF - _BV(pins));
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break;
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case _PORT_C:
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DDRC |= _BV(pins); |
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PORTC &= (0XFF - _BV(pins));
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break;
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case _PORT_D:
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DDRD |= _BV(pins); |
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PORTD &= (0XFF - _BV(pins));
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break;
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case _PORT_E:
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DDRE |= _BV(pins); |
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PORTE &= (0XFF - _BV(pins));
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break;
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case _PORT_F:
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DDRF |= _BV(pins); |
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PORTF &= (0XFF - _BV(pins));
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break;
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case _PORT_G:
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DDRG |= _BV(pins); |
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PORTG &= (0XFF - _BV(pins));
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break;
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} |
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} |
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else { /* ( val == 1) */ |
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switch(portpin >> 3) { |
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case _PORT_A:
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DDRA |= _BV(pins); |
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PORTA |= _BV(pins); |
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break;
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case _PORT_B:
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DDRB |= _BV(pins); |
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PORTB |= _BV(pins); |
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break;
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case _PORT_C:
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DDRC |= _BV(pins); |
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PORTC |= _BV(pins); |
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break;
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case _PORT_D:
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DDRD |= _BV(pins); |
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PORTD |= _BV(pins); |
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break;
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case _PORT_E:
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DDRE |= _BV(pins); |
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PORTE |= _BV(pins); |
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break;
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case _PORT_F:
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DDRF |= _BV(pins); |
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PORTF |= _BV(pins); |
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break;
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case _PORT_G:
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DDRG |= _BV(pins); |
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PORTG |= _BV(pins); |
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break;
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} |
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} |
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} |
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//////////////////////////////////////
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//////////// button1 //////////////
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//////////////////////////////////////
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/*
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return 1 if button is pressed, 0 otherwise
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*/
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int button1_read( void ) |
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{
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//return (BTN & (_BV(BTN1)) >> BTN1);
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return (PIN_BTN >> BTN1) & 1; |
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} |
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/*
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similar to button1_read, but hold program until the button is actually pressed
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*/
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void button1_wait( void ) |
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{
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while(!button1_read() ) {
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delay_ms(15);
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} |
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} |
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/*
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same as button1_wait
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However, blink the led while waiting
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IMPORTANT: This requires that the LED has been initialized ( init_led )
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*/
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void button1_wait_led( void ) |
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{
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int i = 0; |
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while(!button1_read() ) {
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if( i < 8 ) |
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led_user(1);
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else {
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led_user(0);
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} |
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//increment i, but restart when i = 15;
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i = (i+1) & 0xF; |
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delay_ms(15);
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} |
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led_user(0);
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} |
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//////////////////////////////////////
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//////////// button2 //////////////
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//////////////////////////////////////
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//see button1 functions for descriptions
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//same except for which button is used
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int button2_read( void ) |
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{
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return (PIN_BTN >> BTN2) & 1; |
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} |
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void button2_wait( void ) |
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{
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while(!button2_read() ) {
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delay_ms(15);
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} |
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} |
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void button2_wait_led( void ) |
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{
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int i = 0; |
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while(!button2_read() ) {
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if( i < 8 ) |
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led_user(1);
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else {
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led_user(0);
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} |
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//increment i, but restart when i = 15;
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i = (i+1) & 0xF; |
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delay_ms(15);
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} |
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led_user(0);
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} |
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/*
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// EXTERNAL INTERRUPTS
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/// example code to be used by anyone in need
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/// this example has 2 bump sensors on PE6 and PE7
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// left touch sensor on PE6
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SIGNAL (SIG_INTERRUPT6)
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{
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putcharlcd('6');
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}
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// right touch sensor on PE7
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SIGNAL (SIG_INTERRUPT7)
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{
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putcharlcd('7');
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}
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*/
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