In line 7 the memset() function is defined which will replace all the char array values to zero byte by byte. Alternatively, we can say that our array is now empty containing no byte values. Below is an illustration of all the code which will give better understanding. Output of Serial ...
void setup() { char str[] = "This is my string"; // create a string char out_str[40]; // output from string functions placed here int num; // general purpose integer Serial.begin(9600); // (1) print the string Serial.println(str); // (2) get the length of the string (exc...
int value); void sysexCallback(byte, byte, byte*); /* utility functions */ void wireWrite(byte data) { #if ARDUINO >= 100 Wire.write((byte)data); #else Wire.send(data); #endif } byte wireRead(void) { #if ARDUINO >= 100 return Wire.read(); #else return Wire.receive(); #e...
Used by the master to request bytes from a slave device. The bytes may then be retrieved with theavailable()andread()functions. As of Arduino 1.0.1, requestFrom() accepts a boolean argument changing its behavior for compatibility with certain I2C devices. If true, requestFrom() sends a stop...
Do not use the String class, sprintf or dtostrf functions to format numbers. Use itoa function or your own implementation to convert number to char array. You can save about 2KB. See example below./** Converts a number to a char string and places leading zeros. It is useful to mitiga...
pAdvertising->setMinPreferred(0x06); // functions that help with iPhone connections issue pAdvertising->setMinPreferred(0x12); BLEDevice::startAdvertising(); Serial.println("Characteristic defined! Now you can read it in your phone!");
char array with lengthUSBSerial_print_sn(P,Q)USBSerial_println_sn(P,Q)Serial0_print_sn(P,Q)Serial0_println_sn(P,Q) int with baseUSBSerial_print_ub(P,Q)USBSerial_println_ub(P,Q)Serial0_print_ub(P,Q)Serial0_println_ub(P,Q) ...
boolean newDirectory() { // Create a subdirectory, converting the name between char arrays and string objects char fileArray[64]; String fullPath; sprintf(fileArray, DIR_FORMAT, nextDirIndex); // Generate subdirectory name fullPath = BOTTOM_DIR + String(fileArray); // Make a filepath out...
If you do need to work with a String class, you need to make an array of characters, as shown here: char name[5] = {'j', 'o', 's', 'h', 0}; or char name[] = "josh"; If you need to, for example, store multiple strings in an array, you can create an array with ...
// Nunchuck functions // // Uses port C (analog in) pins as power & ground for Nunchuck static void nunchuck_setpowerpins() { #define pwrpin PORTC3 #define gndpin PORTC2 DDRC |= _BV(pwrpin) | _BV(gndpin); PORTC &=~ _BV(gndpin); ...