135 lines
3.0 KiB
C
135 lines
3.0 KiB
C
#include "main.h"
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/* ---- Global Flags ---- */
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int16_t display_song = -1; //! ID of the song currently being displayed, -1 if song list is not initialised
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int16_t selected_song = -1; //! ID of the selected song. -1 if no song is selected.
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struct {
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char* names[MAX_SONGS];
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uint8_t num_songs;
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} songs;
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/** @brief Adds song to list of songs
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*
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* Allocates a new piece of memory for the name.
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*/
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void add_song(char* name) {
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// Error out on too many songs
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if (songs.num_songs == MAX_SONGS) {
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lcd_gotoxy(0,0);
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lcd_puts("Too many songs!");
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while(1);
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}
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// Allocate memory to store name, and increase number
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uint8_t name_len = strlen(name);
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songs.names[songs.num_songs] = malloc(name_len);
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songs.num_songs++;
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}
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/** @brief Clears list of songs
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*
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* Frees all memory used for name storage
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*/
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void clear_songs() {
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// Free all memory
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for (uint8_t i = 0; i < songs.num_songs; i++) {
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free(songs.names[i]);
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}
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songs.num_songs = 0;
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}
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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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sei();
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}
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/** @brief Sets up various GPIO functions
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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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/** @brief Sets up USART for TX and RX with a baud rate of USART_BAUDRATE
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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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}
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void handle_left_press() {
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}
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void handle_right_press() {
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}
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// TODO NOT DONE
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void handle_playpause_press() {
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// If no song selected, select the correct one.
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if (selected_song == -1) {
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comms_select_file(display_song);
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}
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}
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int main() {
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// Scratch variables
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uint8_t incoming_cmd = 0;
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fifo_init();
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gpio_init();
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usart_init();
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lcd_clrscr();
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lcd_gotoxy(0,0);
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// Main loop
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while (1) {
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// Handle incoming messages
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if (fifo_pop(&incoming_cmd) == FIFO_SUCCESS) {
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}
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// Handle "left" button press
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if (BUTTONS_PORT & (1 << BUTTONS_LEFT_PIN)) {
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handle_left_press();
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_delay_ms(100); // Delay to debounce
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}
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// Handle "right" button press
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if (BUTTONS_PORT & (1 << BUTTONS_LEFT_PIN)) {
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handle_left_press();
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_delay_ms(100); // Delay to debounce
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}
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// Handle play/pause button press
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if (BUTTONS_PORT & (1 << BUTTONS_LEFT_PIN)) {
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handle_left_press();
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_delay_ms(100); // Delay to debounce
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}
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}
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} |