First Commit
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MindCreeper03
212
libraries/SdFat/examples/examplesV1/ReadCsv/ReadCsv.ino
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212
libraries/SdFat/examples/examplesV1/ReadCsv/ReadCsv.ino
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// Functions to read a CSV text file one field at a time.
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//
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#include <limits.h>
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#include <SPI.h>
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// next line for SD.h
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//#include <SD.h>
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// next two lines for SdFat
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#include <SdFat.h>
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SdFat SD;
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#define CS_PIN SS
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// example can use comma or semicolon
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#define CSV_DELIM ','
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File file;
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/*
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* Read a file one field at a time.
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*
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* file - File to read.
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*
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* str - Character array for the field.
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*
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* size - Size of str array.
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*
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* delim - csv delimiter.
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*
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* return - negative value for failure.
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* delimiter, '\n' or zero(EOF) for success.
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*/
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int csvReadText(File* file, char* str, size_t size, char delim) {
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char ch;
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int rtn;
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size_t n = 0;
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while (true) {
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// check for EOF
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if (!file->available()) {
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rtn = 0;
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break;
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}
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if (file->read(&ch, 1) != 1) {
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// read error
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rtn = -1;
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break;
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}
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// Delete CR.
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if (ch == '\r') {
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continue;
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}
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if (ch == delim || ch == '\n') {
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rtn = ch;
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break;
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}
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if ((n + 1) >= size) {
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// string too long
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rtn = -2;
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n--;
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break;
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}
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str[n++] = ch;
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}
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str[n] = '\0';
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return rtn;
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}
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//------------------------------------------------------------------------------
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int csvReadInt32(File* file, int32_t* num, char delim) {
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char buf[20];
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char* ptr;
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int rtn = csvReadText(file, buf, sizeof(buf), delim);
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if (rtn < 0) return rtn;
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*num = strtol(buf, &ptr, 10);
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if (buf == ptr) return -3;
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while(isspace(*ptr)) ptr++;
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return *ptr == 0 ? rtn : -4;
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}
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//------------------------------------------------------------------------------
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int csvReadInt16(File* file, int16_t* num, char delim) {
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int32_t tmp;
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int rtn = csvReadInt32(file, &tmp, delim);
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if (rtn < 0) return rtn;
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if (tmp < INT_MIN || tmp > INT_MAX) return -5;
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*num = tmp;
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return rtn;
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}
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//------------------------------------------------------------------------------
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int csvReadUint32(File* file, uint32_t* num, char delim) {
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char buf[20];
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char* ptr;
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int rtn = csvReadText(file, buf, sizeof(buf), delim);
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if (rtn < 0) return rtn;
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*num = strtoul(buf, &ptr, 10);
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if (buf == ptr) return -3;
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while(isspace(*ptr)) ptr++;
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return *ptr == 0 ? rtn : -4;
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}
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//------------------------------------------------------------------------------
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int csvReadUint16(File* file, uint16_t* num, char delim) {
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uint32_t tmp;
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int rtn = csvReadUint32(file, &tmp, delim);
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if (rtn < 0) return rtn;
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if (tmp > UINT_MAX) return -5;
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*num = tmp;
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return rtn;
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}
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//------------------------------------------------------------------------------
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int csvReadDouble(File* file, double* num, char delim) {
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char buf[20];
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char* ptr;
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int rtn = csvReadText(file, buf, sizeof(buf), delim);
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if (rtn < 0) return rtn;
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*num = strtod(buf, &ptr);
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if (buf == ptr) return -3;
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while(isspace(*ptr)) ptr++;
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return *ptr == 0 ? rtn : -4;
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}
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//------------------------------------------------------------------------------
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int csvReadFloat(File* file, float* num, char delim) {
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double tmp;
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int rtn = csvReadDouble(file, &tmp, delim);
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if (rtn < 0)return rtn;
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// could test for too large.
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*num = tmp;
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return rtn;
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}
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//------------------------------------------------------------------------------
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void setup() {
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Serial.begin(9600);
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// Wait for USB Serial
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while (!Serial) {
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yield();
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}
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Serial.println("Type any character to start");
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while (!Serial.available()) {
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yield();
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}
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// Initialize the SD.
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if (!SD.begin(CS_PIN)) {
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Serial.println("begin failed");
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return;
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}
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// Remove existing file.
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SD.remove("READTEST.TXT");
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// Create the file.
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file = SD.open("READTEST.TXT", FILE_WRITE);
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if (!file) {
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Serial.println("open failed");
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return;
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}
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// Write test data.
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file.print(F(
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#if CSV_DELIM == ','
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"36,23.20,20.70,57.60,79.50,01:08:14,23.06.16\r\n"
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"37,23.21,20.71,57.61,79.51,02:08:14,23.07.16\r\n"
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#elif CSV_DELIM == ';'
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"36;23.20;20.70;57.60;79.50;01:08:14;23.06.16\r\n"
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"37;23.21;20.71;57.61;79.51;02:08:14;23.07.16\r\n"
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#else
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#error "Bad CSV_DELIM"
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#endif
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));
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// Rewind the file for read.
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file.seek(0);
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// Read the file and print fields.
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int16_t tcalc;
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float t1, t2, h1, h2;
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// Must be dim 9 to allow for zero byte.
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char timeS[9], dateS[9];
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while (file.available()) {
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if (csvReadInt16(&file, &tcalc, CSV_DELIM) != CSV_DELIM
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|| csvReadFloat(&file, &t1, CSV_DELIM) != CSV_DELIM
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|| csvReadFloat(&file, &t2, CSV_DELIM) != CSV_DELIM
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|| csvReadFloat(&file, &h1, CSV_DELIM) != CSV_DELIM
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|| csvReadFloat(&file, &h2, CSV_DELIM) != CSV_DELIM
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|| csvReadText(&file, timeS, sizeof(timeS), CSV_DELIM) != CSV_DELIM
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|| csvReadText(&file, dateS, sizeof(dateS), CSV_DELIM) != '\n') {
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Serial.println("read error");
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int ch;
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int nr = 0;
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// print part of file after error.
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while ((ch = file.read()) > 0 && nr++ < 100) {
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Serial.write(ch);
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}
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break;
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}
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Serial.print(tcalc);
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Serial.print(CSV_DELIM);
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Serial.print(t1);
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Serial.print(CSV_DELIM);
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Serial.print(t2);
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Serial.print(CSV_DELIM);
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Serial.print(h1);
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Serial.print(CSV_DELIM);
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Serial.print(h2);
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Serial.print(CSV_DELIM);
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Serial.print(timeS);
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Serial.print(CSV_DELIM);
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Serial.println(dateS);
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}
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file.close();
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}
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//------------------------------------------------------------------------------
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void loop() {
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}
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