spdis/Dorm-Air-Conditioner-Smart-Controller
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revert b3c6b4cde9

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revert 修复红外的兼容性问题
This commit is contained in:
spdis
2025-09-23 14:09:49 +08:00
parent 21d21f8247
commit 9f663aed0b
3 changed files with 133 additions and 388 deletions
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80
Dorm-Air-Conditioner-Smart-Controller.ino
View File

@@ -190,11 +190,8 @@ void sendStoredIRSignal(String buttonName) {
// 从字符串解析红外信号
IRSignal parseIRSignalFromString(String dataStr) {
IRSignal signal;
signal.markTimes = nullptr;
signal.spaceTimes = nullptr;
signal.markCount = 0;
signal.spaceCount = 0;
signal.carrierFreq = IR_CARRIER_FREQ;
signal.data = nullptr;
signal.length = 0;
signal.isValid = false;
if (dataStr.length() == 0) {
@@ -206,11 +203,11 @@ IRSignal parseIRSignalFromString(String dataStr) {
for (int i = 0; i < dataStr.length(); i++) {
if (dataStr[i] == ',') commaCount++;
}
int totalLength = commaCount + 1;
signal.length = commaCount + 1;
// 分配临时内存存储原始数据
unsigned int* tempData = (unsigned int*)malloc(totalLength * sizeof(unsigned int));
if (tempData == nullptr) {
// 分配内存
signal.data = (unsigned int*)malloc(signal.length * sizeof(unsigned int));
if (signal.data == nullptr) {
return signal;
}
@@ -220,78 +217,27 @@ IRSignal parseIRSignalFromString(String dataStr) {
for (int i = 0; i <= dataStr.length(); i++) {
if (i == dataStr.length() || dataStr[i] == ',') {
String valueStr = dataStr.substring(startPos, i);
tempData[index] = valueStr.toInt();
signal.data[index] = valueStr.toInt();
index++;
startPos = i + 1;
}
}
// 分离mark和space数据
signal.markCount = (totalLength + 1) / 2;
signal.spaceCount = totalLength / 2;
// 分配mark时间数组
if (signal.markCount > 0) {
signal.markTimes = (unsigned int*)malloc(signal.markCount * sizeof(unsigned int));
if (signal.markTimes == nullptr) {
free(tempData);
return signal;
}
for (int i = 0; i < signal.markCount; i++) {
signal.markTimes[i] = tempData[i * 2];
}
}
// 分配space时间数组
if (signal.spaceCount > 0) {
signal.spaceTimes = (unsigned int*)malloc(signal.spaceCount * sizeof(unsigned int));
if (signal.spaceTimes == nullptr) {
if (signal.markTimes != nullptr) {
free(signal.markTimes);
signal.markTimes = nullptr;
signal.markCount = 0;
}
free(tempData);
return signal;
}
for (int i = 0; i < signal.spaceCount; i++) {
signal.spaceTimes[i] = tempData[i * 2 + 1];
}
}
free(tempData);
signal.isValid = true;
return signal;
}
// 将红外信号转换为字符串
String irSignalToString(const IRSignal& signal) {
if (!signal.isValid ||
(signal.markTimes == nullptr && signal.spaceTimes == nullptr) ||
(signal.markCount == 0 && signal.spaceCount == 0)) {
if (!signal.isValid || signal.data == nullptr || signal.length == 0) {
return "";
}
String result = "";
int maxCount = max(signal.markCount, signal.spaceCount);
// 重建原始时序数据：交替输出mark和space
for (int i = 0; i < maxCount; i++) {
// 添加mark时间
if (i < signal.markCount) {
if (result.length() > 0) result += ",";
result += String(signal.markTimes[i]);
}
// 添加space时间
if (i < signal.spaceCount) {
if (result.length() > 0) result += ",";
result += String(signal.spaceTimes[i]);
}
for (int i = 0; i < signal.length; i++) {
if (i > 0) result += ",";
result += String(signal.data[i]);
}
return result;
}
@@ -805,7 +751,7 @@ void handleStartRecord() {
prefs.putString(("ir_" + buttonName).c_str(), irDataStr);
Serial.println("红外信号录入成功: " + buttonName);
Serial.println("mark数量: " + String(signal.markCount) + ", space数量: " + String(signal.spaceCount));
Serial.println("信号长度: " + String(signal.length));
freeIRSignal(signal);
server.send(200, "application/json", "{\"success\":true}");
@@ -822,7 +768,7 @@ void handleSendIR() {
return;
}
DynamicJsonDocument doc(26700);
DynamicJsonDocument doc(200);
deserializeJson(doc, server.arg("plain"));
String buttonName = doc["button"];

405
ir_control.cpp
View File

@@ -1,323 +1,169 @@
#include "ir_control.h"
void initIRControl() {
// 配置RMT发送通道
rmt_config_t rmt_tx_config = RMT_DEFAULT_CONFIG_TX((gpio_num_t)IR_SEND_PIN, RMT_TX_CHANNEL);
rmt_tx_config.clk_div = RMT_CLK_DIV;
rmt_tx_config.mem_block_num = RMT_MEM_BLOCK_NUM;
rmt_tx_config.tx_config.carrier_en = RMT_TX_CARRIER_EN;
rmt_tx_config.tx_config.carrier_freq_hz = RMT_TX_CARRIER_FREQ_HZ;
rmt_tx_config.tx_config.carrier_duty_percent = RMT_TX_CARRIER_DUTY_PERCENT;
rmt_tx_config.tx_config.carrier_level = RMT_TX_CARRIER_LEVEL;
rmt_tx_config.tx_config.idle_level = RMT_IDLE_LEVEL;
rmt_tx_config.tx_config.idle_output_en = true;
pinMode(IR_RECEIVE_PIN, INPUT);
pinMode(IR_SEND_PIN, OUTPUT);
digitalWrite(IR_SEND_PIN, LOW);
esp_err_t err = rmt_config(&rmt_tx_config);
if (err != ESP_OK) {
Serial.printf("RMT发送通道配置失败: %s\n", esp_err_to_name(err));
return;
}
err = rmt_driver_install(RMT_TX_CHANNEL, 0, 0);
if (err != ESP_OK) {
Serial.printf("RMT发送驱动安装失败: %s\n", esp_err_to_name(err));
return;
}
// 配置RMT接收通道
rmt_config_t rmt_rx_config = RMT_DEFAULT_CONFIG_RX((gpio_num_t)IR_RECEIVE_PIN, RMT_RX_CHANNEL);
rmt_rx_config.clk_div = RMT_CLK_DIV;
rmt_rx_config.mem_block_num = RMT_MEM_BLOCK_NUM;
rmt_rx_config.rx_config.filter_en = RMT_RX_FILTER_EN;
rmt_rx_config.rx_config.filter_ticks_thresh = RMT_RX_FILTER_THRESH_US;
rmt_rx_config.rx_config.idle_threshold = RMT_RX_IDLE_THRESH_US;
err = rmt_config(&rmt_rx_config);
if (err != ESP_OK) {
Serial.printf("RMT接收通道配置失败: %s\n", esp_err_to_name(err));
return;
}
err = rmt_driver_install(RMT_RX_CHANNEL, 1000, 0);
if (err != ESP_OK) {
Serial.printf("RMT接收驱动安装失败: %s\n", esp_err_to_name(err));
return;
}
Serial.println("红外控制模块初始化完成 (使用RMT)");
Serial.printf("发送引脚: %d (RMT通道: %d)\n", IR_SEND_PIN, RMT_TX_CHANNEL);
Serial.printf("接收引脚: %d (RMT通道: %d)\n", IR_RECEIVE_PIN, RMT_RX_CHANNEL);
Serial.printf("载波频率: %d Hz\n", RMT_TX_CARRIER_FREQ_HZ);
Serial.printf("时钟分辨率: %d us\n", RMT_CLK_DIV);
Serial.println("红外控制模块初始化完成");
Serial.print("接收引脚: ");
Serial.println(IR_RECEIVE_PIN);
Serial.print("发送引脚: ");
Serial.println(IR_SEND_PIN);
}
bool checkIRSignalStart() {
// 使用RMT检查是否有信号开始
// 启动接收并检查是否立即有数据
rmt_rx_start(RMT_RX_CHANNEL, true);
// 等待短时间检查是否有信号
vTaskDelay(pdMS_TO_TICKS(1));
// 获取RMT环形缓冲区句柄
RingbufHandle_t rb = NULL;
esp_err_t err = rmt_get_ringbuf_handle(RMT_RX_CHANNEL, &rb);
if (err != ESP_OK) {
rmt_rx_stop(RMT_RX_CHANNEL);
return false;
}
// 检查RMT接收缓冲区是否有数据
size_t rx_size = 0;
rmt_item32_t* items = (rmt_item32_t*)xRingbufferReceive(rb, &rx_size, 0);
bool hasSignal = (items != nullptr && rx_size > 0);
if (items) {
vRingbufferReturnItem(rb, (void*)items);
}
rmt_rx_stop(RMT_RX_CHANNEL);
return hasSignal;
return (digitalRead(IR_RECEIVE_PIN) == LOW);
}
IRSignal receiveIRSignal() {
IRSignal signal;
signal.markTimes = nullptr;
signal.spaceTimes = nullptr;
signal.markCount = 0;
signal.spaceCount = 0;
signal.carrierFreq = IR_CARRIER_FREQ;
signal.data = nullptr;
signal.length = 0;
signal.isValid = false;
Serial.println("开始接收红外信号 (使用RMT)...");
Serial.println("开始接收红外信号...");
// 启动RMT接收
rmt_rx_start(RMT_RX_CHANNEL, true);
// 获取RMT环形缓冲区句柄
RingbufHandle_t rb = NULL;
esp_err_t err = rmt_get_ringbuf_handle(RMT_RX_CHANNEL, &rb);
if (err != ESP_OK) {
Serial.printf("获取RMT缓冲区句柄失败: %s\n", esp_err_to_name(err));
rmt_rx_stop(RMT_RX_CHANNEL);
// 分配内存存储信号数据
signal.data = (unsigned int*)malloc(MAX_SIGNAL_LENGTH * sizeof(unsigned int));
if (signal.data == nullptr) {
Serial.println("内存分配失败");
return signal;
}
// 等待接收数据
size_t rx_size = 0;
rmt_item32_t* items = (rmt_item32_t*)xRingbufferReceive(rb, &rx_size, pdMS_TO_TICKS(RECEIVE_TIMEOUT_US / 1000));
unsigned long startTime = micros();
unsigned long lastChange = startTime;
bool currentState = HIGH;
bool lastState = HIGH;
if (items == nullptr || rx_size == 0) {
Serial.println("RMT接收超时或无数据");
rmt_rx_stop(RMT_RX_CHANNEL);
// 等待信号开始（第一个低电平）
while (digitalRead(IR_RECEIVE_PIN) == HIGH && (micros() - startTime) < RECEIVE_TIMEOUT_US) {
delayMicroseconds(10);
}
if ((micros() - startTime) >= RECEIVE_TIMEOUT_US) {
Serial.println("等待信号超时");
free(signal.data);
signal.data = nullptr;
return signal;
}
// 计算接收到的项目数量
size_t item_count = rx_size / sizeof(rmt_item32_t);
Serial.printf("接收到 %d 个RMT项目\n", item_count);
Serial.println("检测到信号开始");
lastChange = micros();
lastState = LOW;
signal.length = 0;
if (item_count == 0) {
Serial.println("接收到的数据为空");
vRingbufferReturnItem(rb, (void*)items);
rmt_rx_stop(RMT_RX_CHANNEL);
return signal;
}
// 分配临时数组存储时序数据
unsigned int* tempData = (unsigned int*)malloc(item_count * 2 * sizeof(unsigned int));
if (tempData == nullptr) {
Serial.println("临时数据内存分配失败");
vRingbufferReturnItem(rb, (void*)items);
rmt_rx_stop(RMT_RX_CHANNEL);
return signal;
}
int tempLength = 0;
// 解析RMT数据项
for (size_t i = 0; i < item_count; i++) {
// 每个RMT项目包含两个时间段：level0的持续时间和level1的持续时间
if (items[i].duration0 > 0 && tempLength < item_count * 2) {
tempData[tempLength++] = items[i].duration0;
}
if (items[i].duration1 > 0 && tempLength < item_count * 2) {
tempData[tempLength++] = items[i].duration1;
}
}
// 释放RMT缓冲区
vRingbufferReturnItem(rb, (void*)items);
rmt_rx_stop(RMT_RX_CHANNEL);
if (tempLength > 0) {
// 分离mark和space时间
signal.markCount = (tempLength + 1) / 2; // 奇数索引是mark
signal.spaceCount = tempLength / 2; // 偶数索引是space
// 接收信号数据
while (signal.length < MAX_SIGNAL_LENGTH) {
currentState = digitalRead(IR_RECEIVE_PIN);
// 分配mark时间数组
if (signal.markCount > 0) {
signal.markTimes = (unsigned int*)malloc(signal.markCount * sizeof(unsigned int));
if (signal.markTimes == nullptr) {
Serial.println("mark时间数组内存分配失败");
free(tempData);
return signal;
}
if (currentState != lastState) {
// 状态改变，记录持续时间
unsigned long duration = micros() - lastChange;
signal.data[signal.length] = duration;
signal.length++;
// 复制mark时间（从索引0开始，每隔2个取一个）
for (int i = 0; i < signal.markCount; i++) {
signal.markTimes[i] = tempData[i * 2];
}
lastState = currentState;
lastChange = micros();
}
// 分配space时间数组
if (signal.spaceCount > 0) {
signal.spaceTimes = (unsigned int*)malloc(signal.spaceCount * sizeof(unsigned int));
if (signal.spaceTimes == nullptr) {
Serial.println("space时间数组内存分配失败");
if (signal.markTimes != nullptr) {
free(signal.markTimes);
signal.markTimes = nullptr;
}
free(tempData);
return signal;
}
// 复制space时间（从索引1开始，每隔2个取一个）
for (int i = 0; i < signal.spaceCount; i++) {
signal.spaceTimes[i] = tempData[i * 2 + 1];
}
// 检查是否信号结束（高电平持续时间过长）
if (currentState == HIGH && (micros() - lastChange) > SIGNAL_END_TIMEOUT_US) {
Serial.println("检测到信号结束");
break;
}
// 总体超时检查
if ((micros() - startTime) > RECEIVE_TIMEOUT_US) {
Serial.println("接收总体超时");
break;
}
}
if (signal.length > 0) {
signal.isValid = true;
Serial.printf("RMT信号接收成功，mark数量: %d, space数量: %d\n", signal.markCount, signal.spaceCount);
Serial.print("信号接收成功，长度: ");
Serial.println(signal.length);
// 重新分配内存以节省空间
signal.data = (unsigned int*)realloc(signal.data, signal.length * sizeof(unsigned int));
if (signal.data == nullptr) {
Serial.println("内存重新分配失败");
signal.isValid = false;
signal.length = 0;
}
} else {
Serial.println("未接收到有效的RMT信号数据");
Serial.println("未接收到有效信号");
free(signal.data);
signal.data = nullptr;
}
free(tempData);
return signal;
}
// generateCarrier函数已被RMT模块替代，不再需要
bool sendIRSignal(const IRSignal& signal) {
if (!isValidIRSignal(signal)) {
Serial.println("信号无效，无法发送");
return false;
}
Serial.println("开始发送红外信号 (使用RMT)...");
Serial.printf("载波频率: %d Hz\n", signal.carrierFreq);
Serial.printf("mark数量: %d, space数量: %d\n", signal.markCount, signal.spaceCount);
Serial.println("开始发送红外信号...");
Serial.print("信号长度: ");
Serial.println(signal.length);
// 计算需要的RMT项目数量
int maxCount = max(signal.markCount, signal.spaceCount);
size_t item_count = maxCount;
// 禁用中断以确保精确的时序
noInterrupts();
// 分配RMT项目数组
rmt_item32_t* items = (rmt_item32_t*)malloc(item_count * sizeof(rmt_item32_t));
if (items == nullptr) {
Serial.println("RMT项目内存分配失败");
return false;
bool state = LOW; // 红外信号通常以低电平开始
for (int i = 0; i < signal.length; i++) {
digitalWrite(IR_SEND_PIN, state);
delayMicroseconds(signal.data[i]);
state = !state; // 切换状态
}
// 构建RMT数据项
for (int i = 0; i < maxCount; i++) {
items[i].level0 = 1; // mark期间为高电平（载波调制）
items[i].duration0 = (i < signal.markCount) ? signal.markTimes[i] : 0;
items[i].level1 = 0; // space期间为低电平（无载波）
items[i].duration1 = (i < signal.spaceCount) ? signal.spaceTimes[i] : 0;
}
// 确保最后是低电平
digitalWrite(IR_SEND_PIN, LOW);
// 发送RMT数据
esp_err_t err = rmt_write_items(RMT_TX_CHANNEL, items, item_count, true);
// 重新启用中断
interrupts();
if (err != ESP_OK) {
Serial.printf("RMT发送失败: %s\n", esp_err_to_name(err));
free(items);
return false;
}
// 等待发送完成
err = rmt_wait_tx_done(RMT_TX_CHANNEL, pdMS_TO_TICKS(1000));
if (err != ESP_OK) {
Serial.printf("RMT发送等待超时: %s\n", esp_err_to_name(err));
free(items);
return false;
}
free(items);
Serial.println("RMT信号发送完成");
Serial.println("信号发送完成");
return true;
}
void freeIRSignal(IRSignal& signal) {
if (signal.markTimes != nullptr) {
free(signal.markTimes);
signal.markTimes = nullptr;
if (signal.data != nullptr) {
free(signal.data);
signal.data = nullptr;
}
if (signal.spaceTimes != nullptr) {
free(signal.spaceTimes);
signal.spaceTimes = nullptr;
}
signal.markCount = 0;
signal.spaceCount = 0;
signal.carrierFreq = 0;
signal.length = 0;
signal.isValid = false;
}
IRSignal copyIRSignal(const IRSignal& source) {
IRSignal copy;
copy.markTimes = nullptr;
copy.spaceTimes = nullptr;
copy.markCount = 0;
copy.spaceCount = 0;
copy.carrierFreq = 0;
copy.data = nullptr;
copy.length = 0;
copy.isValid = false;
if (!isValidIRSignal(source)) {
return copy;
}
// 复制mark时间数组
if (source.markCount > 0 && source.markTimes != nullptr) {
copy.markTimes = (unsigned int*)malloc(source.markCount * sizeof(unsigned int));
if (copy.markTimes == nullptr) {
Serial.println("复制mark时间数组时内存分配失败");
return copy;
}
for (int i = 0; i < source.markCount; i++) {
copy.markTimes[i] = source.markTimes[i];
}
copy.markCount = source.markCount;
// 分配内存
copy.data = (unsigned int*)malloc(source.length * sizeof(unsigned int));
if (copy.data == nullptr) {
Serial.println("复制信号时内存分配失败");
return copy;
}
// 复制space时间数组
if (source.spaceCount > 0 && source.spaceTimes != nullptr) {
copy.spaceTimes = (unsigned int*)malloc(source.spaceCount * sizeof(unsigned int));
if (copy.spaceTimes == nullptr) {
Serial.println("复制space时间数组时内存分配失败");
if (copy.markTimes != nullptr) {
free(copy.markTimes);
copy.markTimes = nullptr;
copy.markCount = 0;
}
return copy;
}
for (int i = 0; i < source.spaceCount; i++) {
copy.spaceTimes[i] = source.spaceTimes[i];
}
copy.spaceCount = source.spaceCount;
// 复制数据
for (int i = 0; i < source.length; i++) {
copy.data[i] = source.data[i];
}
copy.carrierFreq = source.carrierFreq;
copy.length = source.length;
copy.isValid = true;
return copy;
@@ -330,56 +176,33 @@ void printIRSignal(const IRSignal& signal, int maxPrint) {
}
Serial.println("=== 红外信号数据 ===");
Serial.print("载波频率: ");
Serial.print(signal.carrierFreq);
Serial.println(" Hz");
Serial.print("mark数量: ");
Serial.println(signal.markCount);
Serial.print("space数量: ");
Serial.println(signal.spaceCount);
Serial.print("信号长度: ");
Serial.println(signal.length);
Serial.print("信号有效: ");
Serial.println(signal.isValid ? "是" : "否");
// 打印mark时间
int markPrintCount = (maxPrint == 0) ? signal.markCount : min(maxPrint, signal.markCount);
Serial.println("Mark时间 (微秒):");
for (int i = 0; i < markPrintCount; i++) {
Serial.print("Mark ");
int printCount = (maxPrint == 0) ? signal.length : min(maxPrint, signal.length);
Serial.println("原始数据 (微秒):");
for (int i = 0; i < printCount; i++) {
Serial.print("Index ");
Serial.print(i);
Serial.print(": ");
Serial.print(signal.markTimes[i]);
Serial.println(" us");
Serial.print(signal.data[i]);
Serial.print(" us (");
Serial.print((i % 2 == 0) ? "LOW" : "HIGH");
Serial.println(")");
}
if (markPrintCount < signal.markCount) {
if (printCount < signal.length) {
Serial.print("... 还有 ");
Serial.print(signal.markCount - markPrintCount);
Serial.println(" 个mark数据点未显示");
}
// 打印space时间
int spacePrintCount = (maxPrint == 0) ? signal.spaceCount : min(maxPrint, signal.spaceCount);
Serial.println("Space时间 (微秒):");
for (int i = 0; i < spacePrintCount; i++) {
Serial.print("Space ");
Serial.print(i);
Serial.print(": ");
Serial.print(signal.spaceTimes[i]);
Serial.println(" us");
}
if (spacePrintCount < signal.spaceCount) {
Serial.print("... 还有 ");
Serial.print(signal.spaceCount - spacePrintCount);
Serial.println(" 个space数据点未显示");
Serial.print(signal.length - printCount);
Serial.println(" 个数据点未显示");
}
Serial.println("==================");
}
bool isValidIRSignal(const IRSignal& signal) {
return (signal.isValid &&
((signal.markTimes != nullptr && signal.markCount > 0) ||
(signal.spaceTimes != nullptr && signal.spaceCount > 0)) &&
signal.carrierFreq > 0);
return (signal.data != nullptr && signal.length > 0 && signal.isValid);
}

36
ir_control.h
View File

@@ -2,17 +2,12 @@
#define IR_CONTROL_H
#include <Arduino.h>
#include "driver/rmt.h"
#include "driver/gpio.h"
// 红外信号结构体
struct IRSignal {
unsigned int* markTimes; // mark时间数组（微秒）
unsigned int* spaceTimes; // space时间数组（微秒）
int markCount; // mark数量
int spaceCount; // space数量
unsigned int carrierFreq; // 载波频率（Hz）
bool isValid; // 信号是否有效
unsigned int* data; // 原始信号数据数组（微秒）
int length; // 信号长度
bool isValid; // 信号是否有效
};
// 配置参数
@@ -21,22 +16,6 @@ struct IRSignal {
#define MAX_SIGNAL_LENGTH 1000
#define RECEIVE_TIMEOUT_US 1000000 // 1秒接收超时
#define SIGNAL_END_TIMEOUT_US 50000 // 50ms信号结束判断
#define IR_CARRIER_FREQ 38000 // 38kHz载波频率
#define CARRIER_PERIOD_US 26 // 38kHz载波周期（微秒）
// RMT配置参数
#define RMT_TX_CHANNEL RMT_CHANNEL_0 // RMT发送通道
#define RMT_RX_CHANNEL RMT_CHANNEL_1 // RMT接收通道
#define RMT_CLK_DIV 80 // RMT时钟分频器 (80MHz / 80 = 1MHz, 1us分辨率)
#define RMT_MEM_BLOCK_NUM 1 // RMT内存块数量
#define RMT_TX_CARRIER_EN true // 启用发送载波
#define RMT_TX_CARRIER_FREQ_HZ 38000 // 发送载波频率
#define RMT_TX_CARRIER_DUTY_PERCENT 33 // 载波占空比
#define RMT_TX_CARRIER_LEVEL RMT_CARRIER_LEVEL_HIGH // 载波电平
#define RMT_IDLE_LEVEL RMT_IDLE_LEVEL_LOW // 空闲电平
#define RMT_RX_FILTER_EN true // 启用接收滤波器
#define RMT_RX_FILTER_THRESH_US 100 // 接收滤波器阈值(微秒)
#define RMT_RX_IDLE_THRESH_US 10000 // 接收空闲阈值(微秒)
/**
* 初始化红外控制模块
@@ -54,12 +33,9 @@ bool checkIRSignalStart();
/**
* 接收红外信号
* @return IRSignal 包含红外信号mark/space时序和载波频率的结构体
* - markTimes: 指向mark时间数组的指针
* - spaceTimes: 指向space时间数组的指针
* - markCount: mark数量
* - spaceCount: space数量
* - carrierFreq: 载波频率
* @return IRSignal 包含原始红外信号数据的结构体
* - data: 指向信号数据数组的指针
* - length: 信号数据长度
* - isValid: 是否成功接收到有效信号
*
* 注意：调用者需要在使用完毕后调用 freeIRSignal() 释放内存