Symbolic link
81 lines
1.9 KiB
C
Symbolic link
81 lines
1.9 KiB
C
#ifndef COMMS_H_
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#define COMMS_H_
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#include <avr/io.h>
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#include <string.h>
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/**
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* Our format goes like this:
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*
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* 1 byte command, with data after
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*/
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typedef enum {
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COMMS_CMD_CLR = 0U, //! Clears LCD and all file names
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COMMS_CMD_NUM, //! sends the total number of songs to choose from
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COMMS_CMD_QUERY_NUM,
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COMMS_CMD_QUERY_NAME, //! Queries for the name of a given song ID
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COMMS_CMD_REPLY_NAME, //! Responds with the name of the given song ID
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COMMS_CMD_SELECT_FILE, //! selects a file from the given list to play, data is 1 byte for id
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COMMS_CMD_PLAY, //! Starts playing file
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COMMS_CMD_PAUSE //! pauses playing file
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} comms_cmd_t;
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/** @brief Inline function to send commands and values.
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*/
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inline void comms_send(comms_cmd_t cmd) {
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while (! (UCSR0A & (1 << UDRE0)));
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UDR0 = cmd;
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}
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/** @brief Selects a file from the list on the DAC side.
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*
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* If another song is playing, this will stop
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* that song from playing and select the new one.
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*/
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inline void comms_select_file(uint8_t id) {
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comms_send(COMMS_CMD_SELECT_FILE);
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comms_send((comms_cmd_t) id);
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}
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/** @brief Queries for the name of the given song ID.
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*/
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inline void comms_query_name(uint8_t id) {
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comms_send(COMMS_CMD_QUERY_NAME);
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comms_send(id);
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}
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/** @brief Repliers with the name of the requsted song ID
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*/
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inline void comms_reply_name(char* name) {
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uint8_t len = strlen(name);
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comms_send(COMMS_CMD_REPLY_NAME);
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comms_send(len);
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for (uint8_t i = 0; i < len; i++) {
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comms_send((uint8_t) name[i]);
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}
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}
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/** @brief Clears the LCD list of files.
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*/
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inline void comms_clear() {
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comms_send(COMMS_CMD_CLR);
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}
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/** @brief Starts playing song.
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*/
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inline void comms_play() {
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comms_send(COMMS_CMD_PLAY);
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}
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/** @brief Pauses playing song.
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*/
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inline void comms_pause() {
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comms_send(COMMS_CMD_PLAY);
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}
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#endif |