90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
#include "header.h"
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// ALTERNATE FUNCTIONS :
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// Table 14-9 : port D alternate functions
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// BUTTON1 SW1 PD2 :
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// -> INT0 (External Interrupt 0 Input)
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// -> PCINT18 (Pin Change Interrupt 18)
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// BUTTON2 SW2 PD4 :
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// -> XCK (USART External Clock Input/Output)
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// -> T0 (Timer/Counter 0 External Counter Input)
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// -> PCINT20 (Pin Change Interrupt 20)
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// EXTERNAL INTERRUPTS GROUP :
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// 13.2.4 : pin change interrupt controle register (PCICR)
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// -> bit PCIE2 for PCINT[23:16] (PCI2 Interrupt Vector)
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// PCMSK2 to enable each pin
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// INTERRUPT VECTORS NAME :
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// Table 12-6 : interrupts vectors
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// -> PCINT2_vect
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// ENABLE PIN CHANGE INTERRUPT :
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// 13.2.6 : PCMSK2 – Pin Change Mask Register 2
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// -> (1 << PCINT20) | (1 << PCINT18)
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volatile uint8_t value = 0;
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void print_binary(int value) {
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int mask_3 = 0b1000;
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int bit_at_3 = value & mask_3;
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int bit_at_4 = bit_at_3 << 1;
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PORTB = (value & 0b111) + bit_at_4;
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}
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void increment_int() {
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// int *value = params->value;
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// int max = params->max;
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value = (value >= MAX) ? MAX : ++value;
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}
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void decrement_int() {
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// int *value = params->value;
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// int min = params->min;
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value = (value <= MIN) ? MIN : --value;
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}
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void increment_led() {
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// IncrementParams *params = (IncrementParams *)param;
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increment_int();
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print_binary(value);
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}
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void decrement_led() {
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// IncrementParams *params = (IncrementParams *)param;
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decrement_int();
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print_binary(value);
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}
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void on_press(int bit, void (*action)(void)) {
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if ((TEST(PIND, bit)) == 0) {
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action();
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_delay_ms(20);
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while ((TEST(PIND, bit)) == 0) {
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continue;
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}
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_delay_ms(20);
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}
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}
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// write a program that incr/decr-ements a number with the buttons, using interrupts, empty infinite loop, and displays the result on LEDs in binary
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int main() {
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MODE_OUTPUT(LED1);
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MODE_OUTPUT(LED2);
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MODE_OUTPUT(LED3);
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MODE_OUTPUT(LED4);
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MODE_INPUT(BUTTON1);
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MODE_INPUT(BUTTON2);
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PULLUP_ON(BUTTON1);
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PULLUP_ON(BUTTON2);
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SREG |= ENABLE_GLOBAL_INTERRUPT;
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PCICR = (1 << PCIE2); // 13.2.4 : enable pin change interrupt, bit PCIE2 for PCINT[23:16], (Table 14-9 : alternates : PD2 - PCINT18, PD4 - PCINT20)
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PCMSK2 = (1 << PCINT20) | (1 << PCINT18); // 13.2.6 : enable individual pin chang interrupt
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while(1);
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}
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ISR(PCINT2_vect) {
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on_press(SW1, increment_led);
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on_press(SW2, decrement_led);
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}
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