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使用SD读写完数据后希望通过闪烁LED进行提示,SD卡能读写成功但是LED没有反应,求各位大神指导一二。
代码如下: - // initialize serial communication at 9600 bits per second:
- Serial.begin(9600);
-
- while (!Serial) {
- ; // wait for serial port to connect. Needed for native USB, on LEONARDO, MICRO, YUN, and other 32u4 based boards.
- }
- Serial.print("Initializing SD card...");
- if (!SD.begin(4)) {
- Serial.println(" failed!");
- return;
- } else {
- Serial.println(" done.");
- if (!SD.exists("17060203.DAT")) {
- cacheFile = SD.open("17060203.DAT", FILE_WRITE);
- } else {
- cacheFile = SD.open("17060203.DAT", O_READ|O_WRITE);
- }
-
- if (cacheFile) {
- if (cacheFile.size() == 0) {
- cacheFile.println("DEV-ID:DL092817234");
- cacheFile.println("DEV-ADDR:192.169.0.1");
- cacheFile.println("DEV-MAC:AC-22-11-CD-AE");
- cacheFile.println("--DATALOG--");
- }
- cacheFile.println("20170602111411,33.2,11.2,502,293,11.2,11,23,11,22,33");
- cacheFile.println("20170602111411,33.2,11.2,502,293,11.2,11,23,11,22,33");
- cacheFile.println("20170602111411,33.2,11.2,502,293,11.2,11,23,11,22,33");
-
- cacheFile.seek(0);
- // read from the file until there's nothing else in it:
- while (cacheFile.available()) {
- Serial.write(cacheFile.read());
- }
- cacheFile.close();
- } else {
- Serial.println("error opening/creating file.");
- }
- }
- pinMode(LED_BUILTIN, OUTPUT);
- digitalWrite(LED_BUILTIN, HIGH);
- delay(5000);
- digitalWrite(LED_BUILTIN, LOW);
- delay(3000);
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