Why does the SD card stop logging without error? - arduino

Question

The following sketch is for an Arduino Nano clone. It waits for a START command then collects data from an I2C slave, assembles it for logging on an SD card, writes it to the card, prints it to the serial monitor and repeats. I've tested and retested. The SD card logfile ALWAYS stops after logging the header and 3 out of 30 lines of data, but the serial monitor shows all the expected data. Never in any of my tests was an SD write error generated.
I'd appreciate any ideas as to why the SD stops logging and how to fix it.
Arduino Sketch
#include <Wire.h>
#include <Servo.h>
#include <SD.h>
#include <SPI.h>
// Uncomment the #define below to enable internal polling of data.
#define POLLING_ENABLED
//define slave i2c address
#define I2C_SLAVE_ADDRESS 9
/* ===================================
Arduino Nano Connections
ESC (PWM) Signal - Pin 9 (1000ms min, 2000ms max)
S.Port Signal - Pin 10
SPI Connections
MOSI = Pin 11
MISO = Pin 12
SCLK = PIN 13
I2C Connections
SDA = Pin A4
SCL = Pin A5
Start/Stop Switches
Start = Pin 2 => INT0
Stop = Pin 3 => INT1
===================================*/
Servo esc; // Servo object for the ESC - PIN 9
const unsigned long pause = 800; // Number of ms between readings
const unsigned long testDelay = 30000; // Number of ms between tests
const int CS_pin = 10; // Pin to use for CS (SS) on your board
const int Startpin = 2;
const int Stoppin = 3;
const int readings = 3; // Number of readings to take at every step
const int steps = 5; // Number of steps to stop the ESC and take readings
const byte HALT = 0;
int ESC = 0;
int throttle = 0;
int increment;
volatile bool STOP = 0;
volatile bool START = 0;
const String header = "% Thr,Thrust,Curr,Volts,RPM,Cell1,Cell2,Cell3,Cell4,Cell5,Cell6";
char buffer0[33]; // Buffer for I2C received data
char buffer1[33]; // Buffer for I2C received data
String logEntry = " GOT NO DATA "; //52 bytes
void setup() {
Wire.begin();
Serial.begin(115200);
pinMode(Startpin, INPUT_PULLUP);
pinMode(Stoppin, INPUT_PULLUP);
// Attach an interrupt to the ISR vector
attachInterrupt(digitalPinToInterrupt(Startpin), start_ISR, LOW);
attachInterrupt(digitalPinToInterrupt(Stoppin), stop_ISR, LOW);
esc.attach(9, 1000, 2000);
// attaches the ESC on pin 9 to the servo object and sets min and max pulse width
esc.write(HALT); // Shut down Motor NOW!
increment = 180 / (steps - 1);
// Number of degrees to move servo (ESC) per step (servo travel is 0-180 degrees so 180 = 100% throttle)
delay(500);
Serial.println(" Thrust Meter I2C Master");
//Print program name
//Initialize SD Card
if (!SD.begin(CS_pin)) {
Serial.println("Card Failure");
}
Serial.println("Card Ready");
//Write Log File Header to SD Card
writeSD(header);
Serial.println(header);
}
void loop() {
if (START) {
Serial.println("Start Pressed");
while (!STOP) {
for (throttle = 0; throttle <= 180; throttle += increment) {
for (int x = 0; x < readings; x++) {
if (STOP) {
esc.write(HALT); // Shut down Motor NOW!
Serial.println("Halting Motor");
} else {
wait (pause);
esc.write(throttle); // increment the ESC
wait (200);
ESC = throttle * 100 / 180;
getData(buffer0);
wait (100);
getData(buffer1);
String logEntry = String(ESC) + "," + String(buffer1) + "," + String(buffer0);
writeSD(logEntry);
Serial.println(logEntry);
}
}
}
for (throttle = 180; throttle >= 0; throttle -= increment) {
for (int x = 0; x < readings; x++) {
if (STOP) {
esc.write(HALT); // Shut down Motor NOW!
Serial.println("Halting Motor");
} else {
wait (pause);
esc.write(throttle); // increment the ESC
wait (200);
ESC = throttle * 100 / 180;
getData(buffer0);
wait (100);
getData(buffer1);
String logEntry = String(ESC) + "," + String(buffer1) + "," + String(buffer0);
writeSD(logEntry);
Serial.println(logEntry);
}
}
}
Serial.println("End of Test Pass");
wait (testDelay);
}
esc.write(HALT); // Shut down Motor NOW!
}
}
void writeSD(String logdata) {
File logFile = SD.open("NANO_LOG.csv", FILE_WRITE);
if (logFile) {
logFile.println(logdata);
logFile.close();
} else {
Serial.println("Error writing log data");
}
}
void wait(unsigned long i) {
unsigned long time = millis() + i;
while(millis()<time) { }
}
void start_ISR() {
START = 1;
STOP = 0;
}
void stop_ISR() {
STOP = 1;
START = 0;
}
void getData(char* buff) {
Wire.requestFrom(9, 32);
for (byte i = 0; i < 32 && Wire.available(); ++i) {
buff[i] = Wire.read();
if (buff[i] == '#') {
buff[i] = '\0';
break;
}
}
}
This is the SD card contents:
% Thr,Thrust,Curr,Volts,RPM,Cell1,Cell2,Cell3,Cell4,Cell5,Cell6
0,-12,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
0,-12,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
0,128,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
This is the output from the serial monitor:
Thrust Meter I2C Master
Card Ready
% Thr,Thrust,Curr,Volts,RPM,Cell1,Cell2,Cell3,Cell4,Cell5,Cell6
Start Pressed
0,-12,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
0,-12,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
0,128,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
25,2062,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
25,2520,0.00,15.75,0,3.10,4.20,3.96,3.96,0.00,0.00
25,2710,0.00,15.75,0,3.10,4.20,3.96,3.96,0.00,0.00
50,519,0.00,15.75,0,3.10,4.20,3.96,3.96,0.00,0.00
50,216,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
50,2288,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
75,890,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
75,891,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
75,1386,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
100,2621,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
100,2424,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
100,692,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
100,3409,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
100,227,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
100,3349,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
75,2220,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
75,2249,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
75,509,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
50,1977,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
50,2986,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
50,546,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
25,3746,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
25,3337,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
25,3015,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
0,96,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
0,-12,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
0,-14,0.00,15.76,0,3.10,4.20,3.96,3.96,0.00,0.00
End of Test Pass

Answer 1

The solution to the problem was to replace the SD card with a faster one. Once I did that the data logged as it should. Thanks Patrick for the suggestion.