查看EEPROM:update()的源代码

:[[EEPROM库|EEPROM]]

{| border="0" cellpadding="20" width="100%"
|-
|width="100%" valign="top" align="left"|
<font color="olivedrab" size="+3">'''update()'''</font>



<font color="orange" size="+1">'''描述'''</font>

Write a byte to the EEPROM. The value is written only if differs from the one already saved at the same address.


<font color="orange" size="+1">'''语法'''</font>

EEPROM.update(address, value)


<font color="orange" size="+1">'''参数'''</font>

address: the location to write to, starting from 0 (int)

value: the value to write, from 0 to 255 (byte)


<font color="orange" size="+1">'''返回值'''</font>

none


<font color="orange" size="+1">'''注意'''</font>

An EEPROM write takes 3.3 ms to complete. The EEPROM memory has a specified life of 100,000 write/erase cycles, so using this function instead of write() can save cycles if the written data does not change often


<font color="orange" size="+1">'''示例'''</font>

<pre style="color:dimgray">
#include <EEPROM.h>

void setup()
{
  for (int i = 0; i < 255; i++) {
    // this performs as EEPROM.write(i, i)
    EEPROM.update(i, i);
  }
  for (int i = 0; i < 255; i++) {
    // write value "12" to cell 3 only the first time
    // will not write the cell the remaining 254 times
    EEPROM.update(3, 12);
  }
}

void loop()
{
}

</pre>

|}

----

[[EEPROM库|返回EEPROM库]]

[[Arduino库|返回Arduino库菜单]]

[[首页|返回首页]]

更多建议和问题欢迎反馈至 [http://www.yfrobot.com YFRobot论坛]