สอบถาม code การอ่านไฟล์ CSV จาก SD Card

code arduino

#include

#include

/* CSV File Reading */

File file;

int SC = 10;

char location;

bool readLine(File &f, char* line, size_t maxLen) {

for (size_t n = 0; n < maxLen; n++) {

int c = f.read();

if ( c < 0 && n == 0) return false; // EOF

if (c < 0 || c == '\n') {

line[n] = 0;

return true;

}

line[n] = c;

}

return false; // line too long

}

bool readVals(long* v1, String* v2) {

char line[200], *ptr, *str;

if (!readLine(file, line, sizeof(line))) {

return false; // EOF or too long

}

*v1 = strtol(line, &ptr, 10);

if (ptr == line) return false;

while (*ptr) {

if (*ptr++ == ',') break;

}

*v2 = strtol(ptr, &str, 10);

while (*ptr) {

if (*ptr++ == ',') break;

}

return str != ptr; // true if number found

}

/* Close CSV File Reading */

void setup()

{

// Open serial communications and wait for port to open:

Serial.begin(9600);

//SD Card Reader Setup

Serial.begin(9600);

if (!SD.begin(SC)) {

Serial.println("begin error");

return;

}

file = SD.open("USE.CSV", FILE_READ);

if (!file) {

Serial.println("open error");

return;

}

}

void loop() // run over and over

{

long x ;

String y;

while (readVals(&x, &y)) {

//First 4 Long datatype variables

Serial.println(x);

//Last 2 String type variables

Serial.println(y);

}

}

file sd card

แต่เวลา run ขึ้น

101

39

102

29

103

0

104

0

.

.

.

.

115

0

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