I am having trouble interfacing with my SD card and I've discovered that my program is hanging right at the start, in SD.begin(). It never exits from this function even though it is supposed to error if it cannot initialize the card.
(I am using a sanguino variant that uses a 1284P)
I tried changing the MOSI pin to my onboard LED just to see if it was even trying to send data and it just remains solid.
Here's the code:
/*
SD card datalogger
This example shows how to log data from three analog sensors
to an SD card using the SD library.
The circuit:
* analog sensors on analog ins 0, 1, and 2
* SD card attached to SPI bus as follows:
** MOSI - pin 11
** MISO - pin 12
** CLK - pin 13
** CS - pin 4
created 24 Nov 2010
modified 9 Apr 2012
by Tom Igoe
This example code is in the public domain.
*/
#include <SD.h>
// On the Ethernet Shield, CS is pin 4. Note that even if it's not
// used as the CS pin, the hardware CS pin (10 on most Arduino boards,
// 53 on the Mega) must be left as an output or the SD library
// functions will not work.
//const int chipSelect = 4;
int led = 13;
void setup()
{
pinMode(led, OUTPUT);
digitalWrite(led, HIGH);
// Open serial communications and wait for port to open:
//Serial.begin(9600);
// while (!Serial) {
// ; // wait for serial port to connect. Needed for Leonardo only
//}
//Serial.print("Initializing SD card...");
// make sure that the default chip select pin is set to
// output, even if you don't use it:
//pinMode(10, OUTPUT);
// see if the card is present and can be initialized:
if (!SD.begin(SS)) {
digitalWrite(led, LOW);
//Serial.println("Card failed, or not present");
// don't do anything more:
return;
}
digitalWrite(led, LOW);
//Serial.println("card initialized.");
}
void loop()
{
// make a string for assembling the data to log:
String dataString = "";
// read three sensors and append to the string:
for (int analogPin = 0; analogPin < 3; analogPin++) {
int sensor = analogRead(analogPin);
dataString += String(sensor);
if (analogPin < 2) {
dataString += ",";
}
}
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
File dataFile = SD.open("datalog.txt", FILE_WRITE);
digitalWrite(led, LOW);
// if the file is available, write to it:
if (dataFile) {
dataFile.println(dataString);
dataFile.close();
// print to the serial port too:
//Serial.println(dataString);
}
// if the file isn't open, pop up an error:
else {
//Serial.println("error opening datalog.txt");
}
}
#elif defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega1284__)
// Sanguino
// Two Wire (aka I2C) ports
uint8_t const SDA_PIN = 17;
uint8_t const SCL_PIN = 18;
// SPI port
uint8_t const SS_PIN = 1;
uint8_t const MOSI_PIN = 9;
uint8_t const MISO_PIN = 8;
uint8_t const SCK_PIN = 0;
static const pin_map_t digitalPinMap[] = {
{&DDRB, &PINB, &PORTB, 0}, // B0 0
{&DDRB, &PINB, &PORTB, 1}, // B1 1
{&DDRB, &PINB, &PORTB, 2}, // B2 2
{&DDRB, &PINB, &PORTB, 3}, // B3 3
{&DDRB, &PINB, &PORTB, 4}, // B4 4
{&DDRB, &PINB, &PORTB, 5}, // B5 5
{&DDRB, &PINB, &PORTB, 6}, // B6 6
{&DDRB, &PINB, &PORTB, 7}, // B7 7
{&DDRD, &PIND, &PORTD, 0}, // D0 8
{&DDRD, &PIND, &PORTD, 1}, // D1 9
{&DDRD, &PIND, &PORTD, 2}, // D2 10
{&DDRD, &PIND, &PORTD, 3}, // D3 11
{&DDRD, &PIND, &PORTD, 4}, // D4 12
{&DDRD, &PIND, &PORTD, 5}, // D5 13
{&DDRD, &PIND, &PORTD, 6}, // D6 14
{&DDRD, &PIND, &PORTD, 7}, // D7 15
{&DDRC, &PINC, &PORTC, 0}, // C0 16
{&DDRC, &PINC, &PORTC, 1}, // C1 17
{&DDRC, &PINC, &PORTC, 2}, // C2 18
{&DDRC, &PINC, &PORTC, 3}, // C3 19
{&DDRC, &PINC, &PORTC, 4}, // C4 20
{&DDRC, &PINC, &PORTC, 5}, // C5 21
{&DDRC, &PINC, &PORTC, 6}, // C6 22
{&DDRC, &PINC, &PORTC, 7}, // C7 23
{&DDRA, &PINA, &PORTA, 7}, // A7 24
{&DDRA, &PINA, &PORTA, 6}, // A6 25
{&DDRA, &PINA, &PORTA, 5}, // A5 26
{&DDRA, &PINA, &PORTA, 4}, // A4 27
{&DDRA, &PINA, &PORTA, 3}, // A3 28
{&DDRA, &PINA, &PORTA, 2}, // A2 29
{&DDRA, &PINA, &PORTA, 1}, // A1 30
{&DDRA, &PINA, &PORTA, 0} // A0 31
};
