Arduino 读取/写入EEPROM-值不正确
我正在使用Arduino IDE编程ESP8266板 其想法是在随机时间内播放随机频率的声音,并将最后播放的频率保存到EEPROM中。然后,我有一个看门狗ISR,如果延迟时间是4秒或更长,它会重新启动电路板。当这种情况发生并且电路板重新启动时,我想播放上一次播放的频率1秒,然后再次恢复正常功能 这是我的密码Arduino 读取/写入EEPROM-值不正确,arduino,esp8266,Arduino,Esp8266,我正在使用Arduino IDE编程ESP8266板 其想法是在随机时间内播放随机频率的声音,并将最后播放的频率保存到EEPROM中。然后,我有一个看门狗ISR,如果延迟时间是4秒或更长,它会重新启动电路板。当这种情况发生并且电路板重新启动时,我想播放上一次播放的频率1秒,然后再次恢复正常功能 这是我的密码 #include <Ticker.h> #include <EEPROM.h> #define PIN_BUZZER 13 // the digital pin th
#include <Ticker.h>
#include <EEPROM.h>
#define PIN_BUZZER 13 // the digital pin the Buzzer is attached to
PROGMEM const int freqs[] = {31, 49, 78, 123, 196, 311, 494, 784, 1245, 1976, 3136,
4978};
Ticker secondTick;
volatile int watchdogCount = 0;
volatile int freqIdx = 0; //the index that will store the last frequency before it restarts
int EEPROM_Addr = 42;
//The Watchdog Interrupt Service Routine (ISR)
void ISRwatchdog() {
watchdogCount++;
//The watchdog will be waken up when the couter reaches 4
if (watchdogCount == 4) {
ESP.restart(); //restarting the board
}
}
void setup() {
EEPROM.begin(4096);
Serial.begin(115200);
secondTick.attach(1, ISRwatchdog); //registering the watchdog ISR
pinMode(PIN_BUZZER, OUTPUT);
int prevFreq = EEPROM.read(EEPROM_Addr); // read previous frequency
if (prevFreq != 255){
Serial.println("Previous frequency found : ");
Serial.println(prevFreq);
analogWrite(PIN_BUZZER, 256);
analogWriteFreq(prevFreq);
delay(1000);
}
}
void loop() {
Serial.print("Watchdog counter = ");
Serial.println(watchdogCount);
watchdogCount = 0;
int freq = freqs[random(0, 11)];
Serial.print("Frequency: ");
Serial.println(freq);
Serial.println("Saving to EEPROM");
EEPROM.write(EEPROM_Addr, freq);
EEPROM.commit();
// generating 50% PWM
analogWrite(PIN_BUZZER, 256);
analogWriteFreq(freq);
//depending on the value of delay, the program may wake up the watchdog
int delayTime = random(1, 5) * 1000;
Serial.print("Delay time: ");
Serial.println(delayTime);
delay(delayTime);
}
在此情况下,先前的频率不正确
在这个输出片段中
Watchdog counter = 1
Frequency: 784
Saving to EEPROM
Delay time: 4000
Watchdog counter = 4
Frequency: 1976
Saving to EEPROM
Delay time: 1000
ets Jan 8 2013,rst cause:2, boot mode:(3,0)
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
v09f0c112
~ld
Previous frequency found :
184
在某些情况下,我的输出是正确的,但这种情况很少见。ESP8266的EEPROM库只存储一个字节。这意味着它不能存储超过255的值——返回的值是存储值的最低有效字节(即,
freq%256
)
考虑在数组中存储值的索引,而不是值本身,例如
uint8_t idx = random(0, 11);
int freq = freqs[idx];
...
EEPROM.write(EEPROM_addr, idx);
及
fwiw,这正是我从EEPROM转向SPIFFS的原因;文件界面直观且无限制。
uint8_t idx = random(0, 11);
int freq = freqs[idx];
...
EEPROM.write(EEPROM_addr, idx);
uint8_t idx = EEPROM.read(EEPROM_addr);
int freq = freqs[idx];