我正在为Arduino IDE中的ESP8266写一个草图。草图以及其他功能之一具有一种模式，该模式将Web服务器每秒调查尽可能接近10次。此轮询是使用ESP8266HTTPClient通过HTTP GET请求完成的。
请求代码：
void updateLEDS() {
HTTPClient pihome;
//Attempt connection to PiHome server.
if (!pihome.begin(endpoint)) {
Serial.println("Connection to PiHome host failed.");
return;
}
pihome.setAuthorization(username, password);
Serial.println("Set authorization");
//If a connection is formed, send get request to device endpoint.
int code = pihome.GET();
Serial.print("Pushed get request:");
Serial.println(code);
if (code > 0) {
Serial.println("Returned http status code > 0");
String response = pihome.getString();
pihome.getStream().write("HTTP/1.1 200 OK\r\nConnection: close\r\nContent-Length: 0\r\n\r\n");
//int CRLF = 0;
int data[NUMLEDS*4];
for (int i = 0;i < response.length() && i < NUMLEDS*4;i++) {
int b = (int) response.charAt(i);
data[i] = b;
}
for (int i = 0;i < NUMLEDS;i++) {
if (sizeof(data) > i*4 + 3) {
front.setPixelColor(response.charAt(i*4)-1, front.Color(pgm_read_byte(&gamma8[response.charAt(i*4+1)-1]), int(pgm_read_byte(&gamma8[response.charAt(i*4+2)-1])*0.8), pgm_read_byte(&gamma8[response.charAt(i*4+3)-1])));
back.setPixelColor(response.charAt(i*4)-1, front.Color(pgm_read_byte(&gamma8[response.charAt(i*4+1)-1]), int(pgm_read_byte(&gamma8[response.charAt(i*4+2)-1])*0.8), pgm_read_byte(&gamma8[response.charAt(i*4+3)-1])));
}
}
front.show();
back.show();
}
pihome.end();
}
在我的程序中的每个其他模式下，ESP运行稳定。但是，当我切换到发出HTTP请求的模式时，大约15-20秒后，ESP崩溃了异常代码29.经过一些调试后，我发现崩溃发生在＆＃34; int code = pihome.GET （）;＆＃34;线。在大约10个显示响应代码为-2的GET请求之后，也会发生崩溃。正如您在代码中看到的，无论响应代码是什么，我都会调用pihome.end（）。在添加其他模式之前，这不是问题，但这些模式没有以任何方式被引用。这与异常代码29一起让我相信这是一个内存问题（也许是容量？）。但是，我正在关闭HTTP连接，所以我不确定还能做什么。
使用EspExceptionDecoder，这是串行监视器中的堆栈跟踪：
Decoding 16 results
0x401004f4: calloc at C:\Users\Qwertyness\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266\umm_malloc/umm_malloc.c line 1684
0x401074dc: pvPortZalloc at C:\Users\Qwertyness\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/heap.c line 33
0x40102cf0: wDev_ProcessFiq at ?? line ?
0x40223234: dns_recv at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/dns.c line 755
0x40223bd9: pbuf_free at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/pbuf.c line 758
0x40226100: udp_input at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/udp.c line 343
0x40107498: pvPortMalloc at C:\Users\Qwertyness\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/heap.c line 13
0x40100000: _stext at ?? line ?
0x4022783c: ip_input at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/ipv4/ip.c line 553
0x40226c45: ethernet_input at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/netif/etharp.c line 1379
0x4020765f: pp_tx_idle_timeout at ?? line ?
0x402075d2: pp_tx_idle_timeout at ?? line ?
0x4021b6c7: ets_snprintf at ?? line ?
供参考，这是整个草图（省略敏感信息）：
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <Adafruit_NeoPixel.h>
#include <math.h>
const uint8_t PROGMEM gamma8[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10,
10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 };
#define FRONT 2
#define BACK 4
#define BUTTON 5
#define NUMLEDS 51
const char* ssid = "SSID";
const char* password = "PASSWORD";
const char* username = "USER";
const char* endpoint = "http://host/endpoint";
Adafruit_NeoPixel front = Adafruit_NeoPixel(NUMLEDS, FRONT, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel back = Adafruit_NeoPixel(NUMLEDS, BACK, NEO_GRB + NEO_KHZ800);
int requestCounter = 0;
bool lastButton = false;
int debounceCount = 0;
int ledMode = 2;
double beatBrightness = 0;
int beatDirection = 1;
int beatNumber = 0;
int beatPause = 0;
void setup() {
//Set up serial communication
Serial.begin(115200);
//Start WiFi connection
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
Serial.println("Attempting to Connect");
delay(500);
}
Serial.println("Connected to WiFi");
//Initialize LED strip
front.begin();
back.begin();
pinMode(5, INPUT_PULLUP);
}
void getColor(int rgb[]) {
rgb[0] = pgm_read_byte(&gamma8[rgb[0]]);
rgb[1] = pgm_read_byte(&gamma8[rgb[1]]);
rgb[2] = pgm_read_byte(&gamma8[rgb[2]]);
}
void updateLEDS() {
HTTPClient pihome;
//Attempt connection to PiHome server.
if (!pihome.begin(endpoint)) {
Serial.println("Connection to PiHome host failed.");
return;
}
pihome.setAuthorization(username, password);
Serial.println("Set authorization");
//If a connection is formed, send get request to device endpoint.
int code = pihome.GET();
Serial.print("Pushed get request:");
Serial.println(code);
if (code > 0) {
Serial.println("Returned http status code > 0");
String response = pihome.getString();
pihome.getStream().write("HTTP/1.1 200 OK\r\nConnection: close\r\nContent-Length: 0\r\n\r\n");
//int CRLF = 0;
int data[NUMLEDS*4];
for (int i = 0;i < response.length() && i < NUMLEDS*4;i++) {
int b = (int) response.charAt(i);
data[i] = b;
}
for (int i = 0;i < NUMLEDS;i++) {
if (sizeof(data) > i*4 + 3) {
front.setPixelColor(response.charAt(i*4)-1, front.Color(pgm_read_byte(&gamma8[response.charAt(i*4+1)-1]), int(pgm_read_byte(&gamma8[response.charAt(i*4+2)-1])*0.8), pgm_read_byte(&gamma8[response.charAt(i*4+3)-1])));
back.setPixelColor(response.charAt(i*4)-1, front.Color(pgm_read_byte(&gamma8[response.charAt(i*4+1)-1]), int(pgm_read_byte(&gamma8[response.charAt(i*4+2)-1])*0.8), pgm_read_byte(&gamma8[response.charAt(i*4+3)-1])));
}
}
front.show();
back.show();
}
pihome.end();
}
void loop() {
//Detect rising edge
if (lastButton == false && !digitalRead(5)) {
debounceCount++;
if (debounceCount >= 2) {
debounceCount = 0;
lastButton = true;
ledMode++;
if (ledMode > 3) {
ledMode = 0;
}
}
}
//Detect falling edge
else if (lastButton == true && digitalRead(5)) {
debounceCount++;
if (debounceCount >= 2) {
debounceCount = 0;
lastButton = false;
}
}
//Only make HTTP request every tenth of a second.
if (requestCounter >= 5) {
if (ledMode == 3) {
updateLEDS();
}
requestCounter = 0;
}
requestCounter++;
//Off mode
if (ledMode == 0) {
for (int i = 0;i < NUMLEDS;i++) {
front.setPixelColor(i, front.Color(0, 0, 0));
back.setPixelColor(i, back.Color(0, 0, 0));
}
front.show();
back.show();
}
//Solid heart mode
else if (ledMode == 1) {
int color[] = {153, 75, 75};
getColor(color);
for (int i = 0;i < NUMLEDS;i++) {
front.setPixelColor(i, front.Color(color[0], color[1], color[2]));
back.setPixelColor(i, back.Color(color[0], color[1], color[2]));
}
front.show();
back.show();
}
//Beating heart mode
else if (ledMode == 2) {
if (beatNumber == 2) {
for (int i = 0;i < NUMLEDS;i++) {
front.setPixelColor(i, 0, 0, 0);
back.setPixelColor(i, 0, 0, 0);
}
if (beatPause >= 50) {
beatPause = 0;
beatNumber = 0;
beatBrightness = 0;
beatDirection = 1;
}
beatPause++;
} else {
beatBrightness += beatDirection;
if (beatBrightness >= 7) {
beatDirection = -1;
} else if (beatBrightness <= 0) {
beatDirection = 1;
beatNumber++;
}
if (beatNumber == 0) {
int color[] = {(int)(153*beatBrightness/7)+50, (int)(75*beatBrightness/7)+25, (int)(75*beatBrightness/7)+25};
getColor(color);
for (int i = 0;i < NUMLEDS;i++) {
front.setPixelColor(i, color[0], color[1], color[2]);
back.setPixelColor(i, color[0], color[1], color[2]);
}
} else if (beatNumber == 1) {
int color[] = {(int)(153*beatBrightness/14)+50, (int)(75*beatBrightness/14)+25, (int)(75*beatBrightness/14)+25};
getColor(color);
for (int i = 0;i < NUMLEDS;i++) {
front.setPixelColor(i, color[0], color[1], color[2]);
back.setPixelColor(i, color[0], color[1], color[2]);
}
}
}
front.show();
back.show();
}
delay(20);
}