磁铁、舵机、网页控制、通信协议
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@@ -0,0 +1,490 @@
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/**
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* @file protocol.c
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* @brief EDC 通讯协议实现 — CRC16 / 组帧 / 解析 / I2C / UART
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*/
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#include "protocol.h"
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#include <string.h>
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#include "esp_log.h"
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#include "freertos/task.h"
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static const char *TAG = "EDC_PROTO";
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/* ================================================================
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* CRC-16/MODBUS
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*
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* 多项式: 0x8005 (逆序 0xA001)
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* 初始值: 0xFFFF
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* 输入/输出: 反射
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* 异或输出: 0x0000
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* 校验范围: CMD + LEN + DATA
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* ================================================================ */
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uint16_t edc_crc16(const uint8_t *data, size_t len)
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{
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uint16_t crc = 0xFFFF;
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for (size_t i = 0; i < len; i++) {
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crc ^= data[i];
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for (int j = 0; j < 8; j++) {
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if (crc & 0x0001) {
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crc = (crc >> 1) ^ 0xA001;
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} else {
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crc >>= 1;
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}
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}
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}
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return crc;
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}
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/* ================================================================
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* 大端序 uint16_t 写入 / 读取
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* ================================================================ */
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static inline void write_u16_be(uint8_t *buf, uint16_t val)
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{
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buf[0] = (uint8_t)(val >> 8);
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buf[1] = (uint8_t)(val);
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}
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static inline uint16_t read_u16_be(const uint8_t *buf)
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{
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return ((uint16_t)buf[0] << 8) | buf[1];
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}
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/* ================================================================
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* Cycle 组帧
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*
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* DATA 区: cycle_id(2B,BE) + frag_count(1B) + fragments(N×12B)
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* Fragment: src.x(2B) src.y(2B) src.angle(2B) dst.x(2B) dst.y(2B) dst.angle(2B)
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* ================================================================ */
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int edc_cycle_pack(const edc_cycle_t *cycle, uint8_t *out)
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{
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uint8_t count = cycle->frag_count;
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if (count < EDC_FRAG_MIN) count = EDC_FRAG_MIN;
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if (count > EDC_FRAG_MAX) count = EDC_FRAG_MAX;
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uint8_t data_len = 3 + count * EDC_FRAG_BYTES; /* id(2) + cnt(1) + frags */
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out[0] = EDC_PROTO_SOF1;
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out[1] = EDC_PROTO_SOF2;
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out[2] = EDC_CMD_CYCLE_DATA;
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out[3] = data_len;
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/* cycle_id (大端) */
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uint8_t *p = &out[4];
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write_u16_be(p, cycle->cycle_id);
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p += 2;
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/* frag_count */
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*p++ = count;
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/* fragments */
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for (int i = 0; i < count; i++) {
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const edc_fragment_t *f = &cycle->fragments[i];
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write_u16_be(p, f->source.x); p += 2;
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write_u16_be(p, f->source.y); p += 2;
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write_u16_be(p, f->source.angle_x10); p += 2;
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write_u16_be(p, f->target.x); p += 2;
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write_u16_be(p, f->target.y); p += 2;
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write_u16_be(p, f->target.angle_x10); p += 2;
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}
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/* CRC16 over [CMD, LEN, DATA] */
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uint16_t crc = edc_crc16(&out[2], 2 + data_len);
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*p++ = (uint8_t)(crc);
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*p++ = (uint8_t)(crc >> 8);
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return (int)(p - out); /* 2 + 1 + 1 + data_len + 2 */
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}
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/* ================================================================
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* Cycle 解析 (逐字节)
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* ================================================================ */
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edc_parse_result_t edc_cycle_parse_byte(edc_frame_ctx_t *ctx, uint8_t byte,
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edc_cycle_t *cycle)
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{
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switch (ctx->state) {
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case EDC_PARSE_OK:
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ctx->idx = 0;
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ctx->state = EDC_PARSE_WAITING;
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/* fall through */
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case EDC_PARSE_WAITING:
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default:
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if (byte == EDC_PROTO_SOF1) {
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ctx->buf[0] = byte;
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ctx->idx = 1;
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}
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return EDC_PARSE_WAITING;
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}
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/* ---- 收帧中 (idx >= 1) ---- */
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if (ctx->idx == 1) {
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if (byte != EDC_PROTO_SOF2) {
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ctx->idx = 0;
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if (byte == EDC_PROTO_SOF1) { ctx->buf[0] = byte; ctx->idx = 1; }
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return EDC_PARSE_WAITING;
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}
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ctx->buf[1] = byte;
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ctx->idx = 2;
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return EDC_PARSE_WAITING;
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}
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if (ctx->idx < EDC_PROTO_FRAME_MAX) {
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ctx->buf[ctx->idx] = byte;
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}
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ctx->idx++;
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/* 确定帧总长 */
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if (ctx->idx == 4) {
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uint8_t data_len = ctx->buf[3];
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if (data_len < 3 || data_len > EDC_PROTO_FRAME_MAX - 6) {
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ctx->idx = 0; ctx->state = EDC_PARSE_WAITING;
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return EDC_PARSE_LEN_ERR;
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}
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ctx->len = 2 + 1 + 1 + data_len + 2; /* SOF+CMD+LEN+DATA+CRC */
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}
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/* 收满一帧 */
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if (ctx->idx >= ctx->len) {
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ctx->idx = ctx->len;
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/* CRC 校验 */
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uint16_t crc_calc = edc_crc16(&ctx->buf[2], 2 + ctx->buf[3]);
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uint16_t crc_recv = ctx->buf[ctx->len - 2] | ((uint16_t)ctx->buf[ctx->len - 1] << 8);
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if (crc_calc != crc_recv) {
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ctx->idx = 0; ctx->state = EDC_PARSE_WAITING;
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return EDC_PARSE_CRC_ERR;
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}
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/* 仅处理 CYCLE_DATA 命令 */
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uint8_t cmd = ctx->buf[2];
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if (cmd != EDC_CMD_CYCLE_DATA) {
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ctx->idx = 0; ctx->state = EDC_PARSE_WAITING;
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return EDC_PARSE_CMD_ERR;
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}
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/* 解析 DATA 区 */
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const uint8_t *d = &ctx->buf[4];
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cycle->cycle_id = read_u16_be(d); d += 2;
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cycle->frag_count = *d; d += 1;
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if (cycle->frag_count < EDC_FRAG_MIN || cycle->frag_count > EDC_FRAG_MAX) {
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ctx->idx = 0; ctx->state = EDC_PARSE_WAITING;
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return EDC_PARSE_LEN_ERR;
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}
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for (int i = 0; i < cycle->frag_count; i++) {
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edc_fragment_t *f = &cycle->fragments[i];
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f->source.x = read_u16_be(d); d += 2;
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f->source.y = read_u16_be(d); d += 2;
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f->source.angle_x10 = read_u16_be(d); d += 2;
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f->target.x = read_u16_be(d); d += 2;
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f->target.y = read_u16_be(d); d += 2;
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f->target.angle_x10 = read_u16_be(d); d += 2;
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}
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cycle->timestamp_ms = 0;
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ctx->state = EDC_PARSE_OK;
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return EDC_PARSE_OK;
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}
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return EDC_PARSE_WAITING;
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}
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/* ================================================================
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* Cycle 解析 (一次性)
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* ================================================================ */
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edc_parse_result_t edc_cycle_parse_buf(const uint8_t *data, size_t len,
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edc_cycle_t *cycle)
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{
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edc_frame_ctx_t ctx = { .state = EDC_PARSE_WAITING };
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edc_parse_result_t res;
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for (size_t i = 0; i < len; i++) {
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res = edc_cycle_parse_byte(&ctx, data[i], cycle);
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if (res != EDC_PARSE_WAITING) return res;
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}
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return EDC_PARSE_WAITING;
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}
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/* ================================================================
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* 统一收发器
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* ================================================================ */
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/* ---- 共享最新 Cycle ---- */
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static edc_cycle_t s_latest_cycle;
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static volatile bool s_cycle_updated;
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static portMUX_TYPE s_lock = portMUX_INITIALIZER_UNLOCKED;
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/* ---- 统计 ---- */
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static edc_proto_stat_t s_stat;
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/* ---- 通道使能 ---- */
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static bool s_i2c_enabled;
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static bool s_uart_enabled;
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/* ---- I2C ---- */
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static i2c_slave_dev_handle_t s_i2c_handle;
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static edc_cycle_t s_i2c_rx_cycle;
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static volatile bool s_i2c_rx_pending;
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/* ---- UART ---- */
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static uart_port_t s_uart_port;
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static edc_frame_ctx_t s_uart_ctx;
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/* ================================================================
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* 内部: 存入共享 Cycle
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* ================================================================ */
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static void store_cycle(const edc_cycle_t *cycle, edc_channel_t ch)
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{
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portENTER_CRITICAL(&s_lock);
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memcpy(&s_latest_cycle, cycle, sizeof(edc_cycle_t));
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s_latest_cycle.timestamp_ms = xTaskGetTickCount() * portTICK_PERIOD_MS;
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s_cycle_updated = true;
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portEXIT_CRITICAL(&s_lock);
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if (ch == EDC_CH_I2C) s_stat.i2c.cycles_ok++;
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else if (ch == EDC_CH_UART) s_stat.uart.cycles_ok++;
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s_stat.last_channel = ch;
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s_stat.last_tick = xTaskGetTickCount();
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}
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/* ================================================================
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* I2C 从机 接收
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* ================================================================ */
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static bool on_i2c_rx(i2c_slave_dev_handle_t handle,
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const i2c_slave_rx_done_event_data_t *evt,
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void *arg)
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{
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s_stat.i2c.bytes_total += evt->length;
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edc_cycle_t cycle;
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if (edc_cycle_parse_buf(evt->buffer, evt->length, &cycle) == EDC_PARSE_OK) {
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memcpy(&s_i2c_rx_cycle, &cycle, sizeof(edc_cycle_t));
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s_i2c_rx_cycle.timestamp_ms = xTaskGetTickCountFromISR() * portTICK_PERIOD_MS;
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s_i2c_rx_pending = true;
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}
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return false;
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}
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static bool i2c_poll_once(void)
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{
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if (!s_i2c_rx_pending) return false;
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edc_cycle_t cycle;
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portENTER_CRITICAL(&s_lock);
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memcpy(&cycle, &s_i2c_rx_cycle, sizeof(edc_cycle_t));
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s_i2c_rx_pending = false;
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portEXIT_CRITICAL(&s_lock);
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store_cycle(&cycle, EDC_CH_I2C);
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ESP_LOGD(TAG, "I2C cycle OK (id=%u frags=%u)", cycle.cycle_id, cycle.frag_count);
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return true;
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}
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/* ================================================================
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* UART 接收
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* ================================================================ */
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static bool uart_poll_once(void)
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{
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uint8_t byte;
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bool got = false;
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while (uart_read_bytes(s_uart_port, &byte, 1, pdMS_TO_TICKS(0)) > 0) {
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s_stat.uart.bytes_total++;
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edc_cycle_t cycle;
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edc_parse_result_t res = edc_cycle_parse_byte(&s_uart_ctx, byte, &cycle);
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if (res == EDC_PARSE_OK) {
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store_cycle(&cycle, EDC_CH_UART);
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got = true;
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ESP_LOGD(TAG, "UART cycle OK (id=%u frags=%u)", cycle.cycle_id, cycle.frag_count);
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} else if (res < 0) {
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s_stat.uart.cycles_err++;
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ESP_LOGW(TAG, "UART parse err: %d", res);
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}
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}
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return got;
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}
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/* ================================================================
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* 内部: 通过 UART 发送短帧
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* ================================================================ */
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static void uart_send_frame(uint8_t cmd, const uint8_t *data, uint8_t data_len)
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{
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uint8_t buf[EDC_PROTO_FRAME_MAX];
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buf[0] = EDC_PROTO_SOF1;
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buf[1] = EDC_PROTO_SOF2;
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buf[2] = cmd;
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buf[3] = data_len;
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if (data && data_len) memcpy(&buf[4], data, data_len);
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uint16_t crc = edc_crc16(&buf[2], 2 + data_len);
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buf[4 + data_len] = (uint8_t)(crc);
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buf[4 + data_len + 1] = (uint8_t)(crc >> 8);
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int total = 4 + data_len + 2;
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uart_write_bytes(s_uart_port, (const char *)buf, total);
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}
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/* ================================================================
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* 初始化
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* ================================================================ */
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void edc_proto_init(const edc_proto_config_t *cfg)
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{
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edc_proto_config_t dft = {
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.i2c_enable = true,
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.i2c_port = EDC_I2C_PORT_DEFAULT,
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.i2c_addr = EDC_I2C_SLAVE_ADDR,
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.i2c_sda = EDC_I2C_SDA_DEFAULT,
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.i2c_scl = EDC_I2C_SCL_DEFAULT,
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.uart_enable = true,
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.uart_port = EDC_UART_PORT_DEFAULT,
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.uart_baudrate = EDC_UART_BAUDRATE,
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.uart_rx = EDC_UART_RX_DEFAULT,
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.uart_tx = EDC_UART_TX_DEFAULT,
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};
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if (cfg) dft = *cfg;
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s_i2c_enabled = dft.i2c_enable;
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s_uart_enabled = dft.uart_enable;
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memset(&s_stat, 0, sizeof(s_stat));
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/* I2C */
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if (s_i2c_enabled) {
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i2c_slave_config_t i2c_cfg = {
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.i2c_port = dft.i2c_port,
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.sda_io_num = dft.i2c_sda,
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.scl_io_num = dft.i2c_scl,
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.clk_source = I2C_CLK_SRC_DEFAULT,
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.send_buf_depth = 0,
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.receive_buf_depth = EDC_I2C_BUF_SIZE,
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.slave_addr = dft.i2c_addr,
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.addr_bit_len = I2C_ADDR_BIT_LEN_7,
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.intr_priority = 0,
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.flags.enable_internal_pullup = true,
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};
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ESP_ERROR_CHECK(i2c_new_slave_device(&i2c_cfg, &s_i2c_handle));
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i2c_slave_event_callbacks_t cbs = {
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.on_receive = on_i2c_rx,
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.on_request = NULL,
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};
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ESP_ERROR_CHECK(i2c_slave_register_event_callbacks(s_i2c_handle, &cbs, NULL));
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ESP_LOGI(TAG, "I2C slave OK (0x%02X SDA=%d SCL=%d)",
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dft.i2c_addr, dft.i2c_sda, dft.i2c_scl);
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}
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/* UART */
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if (s_uart_enabled) {
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s_uart_port = dft.uart_port;
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memset(&s_uart_ctx, 0, sizeof(s_uart_ctx));
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s_uart_ctx.state = EDC_PARSE_WAITING;
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uart_config_t uart_cfg = {
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.baud_rate = dft.uart_baudrate,
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.data_bits = UART_DATA_8_BITS,
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.parity = UART_PARITY_DISABLE,
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.stop_bits = UART_STOP_BITS_1,
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.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
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.source_clk = UART_SCLK_DEFAULT,
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};
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ESP_ERROR_CHECK(uart_driver_install(dft.uart_port,
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EDC_UART_BUF_SIZE, EDC_UART_BUF_SIZE,
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0, NULL, 0));
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ESP_ERROR_CHECK(uart_param_config(dft.uart_port, &uart_cfg));
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ESP_ERROR_CHECK(uart_set_pin(dft.uart_port,
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dft.uart_tx, dft.uart_rx,
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UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE));
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ESP_LOGI(TAG, "UART OK (port=%d baud=%d RX=%d TX=%d)",
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dft.uart_port, dft.uart_baudrate, dft.uart_rx, dft.uart_tx);
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}
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}
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/* ================================================================
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* 轮询
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* ================================================================ */
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int edc_proto_poll(edc_cycle_t *cycle)
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{
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bool got = false;
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if (s_i2c_enabled) got |= i2c_poll_once();
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if (s_uart_enabled) got |= uart_poll_once();
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if (got) {
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portENTER_CRITICAL(&s_lock);
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memcpy(cycle, &s_latest_cycle, sizeof(edc_cycle_t));
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s_cycle_updated = false;
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portEXIT_CRITICAL(&s_lock);
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return 1;
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}
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return 0;
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}
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||||
/* ================================================================
|
||||
* 发送 DONE / REQUEST
|
||||
* ================================================================ */
|
||||
|
||||
void edc_proto_send_done(uint16_t cycle_id)
|
||||
{
|
||||
if (!s_uart_enabled) return;
|
||||
uint8_t data[2];
|
||||
write_u16_be(data, cycle_id);
|
||||
uart_send_frame(EDC_CMD_CYCLE_DONE, data, 2);
|
||||
s_stat.done_sent++;
|
||||
ESP_LOGI(TAG, "DONE sent (cycle_id=%u)", cycle_id);
|
||||
}
|
||||
|
||||
void edc_proto_send_request(void)
|
||||
{
|
||||
if (!s_uart_enabled) return;
|
||||
uart_send_frame(EDC_CMD_CYCLE_REQUEST, NULL, 0);
|
||||
s_stat.request_sent++;
|
||||
ESP_LOGI(TAG, "REQUEST sent");
|
||||
}
|
||||
|
||||
/* ================================================================
|
||||
* 统计
|
||||
* ================================================================ */
|
||||
|
||||
void edc_proto_get_stats(edc_proto_stat_t *stat)
|
||||
{
|
||||
memcpy(stat, &s_stat, sizeof(edc_proto_stat_t));
|
||||
}
|
||||
|
||||
/* ================================================================
|
||||
* 弱回调
|
||||
* ================================================================ */
|
||||
|
||||
__attribute__((weak))
|
||||
void edc_proto_on_cycle(const edc_cycle_t *cycle, edc_channel_t ch)
|
||||
{
|
||||
(void)cycle; (void)ch;
|
||||
}
|
||||
|
||||
/* ================================================================
|
||||
* FreeRTOS 任务
|
||||
* ================================================================ */
|
||||
|
||||
void edc_proto_task(void *pvParam)
|
||||
{
|
||||
edc_cycle_t cycle;
|
||||
while (1) {
|
||||
if (edc_proto_poll(&cycle) > 0) {
|
||||
edc_channel_t ch;
|
||||
portENTER_CRITICAL(&s_lock);
|
||||
ch = s_stat.last_channel;
|
||||
portEXIT_CRITICAL(&s_lock);
|
||||
edc_proto_on_cycle(&cycle, ch);
|
||||
}
|
||||
vTaskDelay(pdMS_TO_TICKS(2));
|
||||
}
|
||||
}
|
||||
Reference in new issue
Block a user