112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/*
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* (c) 2021 by Tomasz bla Fortuna
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* License: GPLv2
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*
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* This file is shared with the Shine firmware. Keep it in sync (and in the
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* shine's clang formatting).
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*/
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#pragma once
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#include <stdint.h>
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#define PROTOCOL_SD SD0
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enum {
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/*
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* Main -> LED
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*/
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/* Basic config */
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CMD_LED_ON = 0x01,
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CMD_LED_OFF = 0x02,
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CMD_LED_SET_PROFILE = 0x03,
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CMD_LED_NEXT_PROFILE = 0x04,
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CMD_LED_PREV_PROFILE = 0x05,
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CMD_LED_NEXT_INTENSITY = 0x06,
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CMD_LED_NEXT_ANIMATION_SPEED = 0x07,
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/* Masks */
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/* Override a key color, eg. capslock */
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CMD_LED_MASK_SET_KEY = 0x10,
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/* Override all keys in a row with configurable colors */
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CMD_LED_MASK_SET_ROW = 0x11,
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/* Override all keys with single color (eg. foreground color) */
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CMD_LED_MASK_SET_MONO = 0x12,
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/* Reactive / status */
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CMD_LED_GET_STATUS = 0x20,
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CMD_LED_KEY_BLINK = 0x21,
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CMD_LED_KEY_DOWN = 0x22,
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CMD_LED_KEY_UP = 0x23, /* TODO */
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CMD_LED_IAP = 0x24,
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/* LED -> Main */
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/* Payload with data to send over HID */
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CMD_LED_DEBUG = 0x40,
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/* Number of profiles, current profile, on/off state,
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reactive flag, brightness, errors */
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CMD_LED_STATUS = 0x41,
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};
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/* 1 ROW * 14 COLS * 4B (RGBX) = 56 + header prefix. */
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#define MAX_PAYLOAD_SIZE 64
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/** Enum of the states used for the serial protocol finite-state automaton */
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enum proto_state {
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/* 2-byte initial start-of-message sync */
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STATE_SYNC_1,
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STATE_SYNC_2,
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/* Waiting for command byte */
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STATE_CMD,
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/* Waiting for ID byte */
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STATE_ID,
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/* Waiting for payload size */
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STATE_PAYLOAD_SIZE,
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/* Reading payload until payload_position == payload_size */
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STATE_PAYLOAD,
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};
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/* Buffer holding a single message */
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typedef struct {
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uint8_t command;
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uint8_t msg_id;
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uint8_t payload_size;
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uint8_t payload[MAX_PAYLOAD_SIZE];
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} message_t;
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/* Internal protocol state */
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typedef struct {
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/* Callback to call upon receiving a valid message */
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void (*callback)(const message_t *);
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/* Number of read payload bytes */
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uint8_t payload_position;
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/* Current finite-state-automata state */
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enum proto_state state;
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uint8_t previous_id;
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uint8_t errors;
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/* Currently received message */
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message_t buffer;
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} protocol_t;
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/* NOTE: This didn't work when defined on stack */
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extern protocol_t proto;
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/* Init state */
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extern void proto_init(protocol_t *proto, void (*callback)(const message_t *));
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/* Consume one byte and push state forward - might call the callback */
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extern void proto_consume(protocol_t *proto, uint8_t byte);
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/* Prolonged silence - reset state */
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extern void proto_silence(protocol_t *proto);
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/* Transmit message */
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extern void proto_tx(uint8_t cmd, const unsigned char *buf, int payload_size, int retries);
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