69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
#include "periph.h"
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/** @brief Handles incoming Serial commands from the main player.
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*/
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ISR(USART_RX_vect) {
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cli();
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// Push incoming data to FIFO
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fifo_push(UDR);
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// Flag is cleared by reading data from UDR
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sei();
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}
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/** @brief Display update timer
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*/
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ISR(TIMER0_COMPA_vect) {
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cli();
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update_display = true;
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// Flag is cleared by calling the vector
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sei();
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}
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void gpio_init() {
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// Initialise button pins as inputs
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BUTTONS_DDR &= ~(1 << BUTTONS_LEFT_PIN) &
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~(1 << BUTTONS_RIGHT_PIN) &
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~(1 << BUTTONS_PLAYPAUSE_PIN);
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// Turn on button pullups
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BUTTONS_PORT |= (1 << BUTTONS_LEFT_PIN) |
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(1 << BUTTONS_RIGHT_PIN) |
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(1 << BUTTONS_PLAYPAUSE_PIN);
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}
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void timer_init() {
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/**
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* Need to verify the math here.
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* But with a prescaler of 1024, f_cpu at 8MHz, an OCRA of 195 gives
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* 20Hz refresh rate.
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*/
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// COM0x can be set to defaults
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// To set to CTC, WGM = 0b010
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TCCR0A = (1 << WGM01);
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// CS = 0b101 -> 1024 prescaler
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// Everything else should be 0.
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// TCCR0B = 0b00000101; <- can't use this because binary stuff is a GCC extension
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TCCR0B = 5;
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// Set to ~20Hz
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OCR0A = 195;
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// Enable interrupt
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TIMSK = (1 << OCIE0A);
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}
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void usart_init() {
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// initialize USART
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UBRRL = UBRR_VALUE & 255;
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UBRRH = UBRR_VALUE >> 8;
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UCSRB = (1 << TXEN) | (1 << RXEN); // fire-up USART
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UCSRC = (1 << UCSZ1) | (1 << UCSZ0); // fire-up USART
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// Enable RX complete interrupt
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UCSRB |= (1 << RXCIE);
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} |