90 lines
3.1 KiB
Arduino
90 lines
3.1 KiB
Arduino
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/*
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ESP32 eeprom_extra example with EEPROM library
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This simple example demonstrates using other EEPROM library resources
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Created for arduino-esp32 on 25 Dec, 2017
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by Elochukwu Ifediora (fedy0)
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*/
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#include "EEPROM.h"
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void setup() {
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// put your setup code here, to run once:
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Serial.begin(115200);
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Serial.println("\nTesting EEPROM Library\n");
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if (!EEPROM.begin(EEPROM.length())) {
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Serial.println("Failed to initialise EEPROM");
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Serial.println("Restarting...");
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delay(1000);
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ESP.restart();
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}
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int address = 0; // Same address is used through the example
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EEPROM.writeByte(address, -128); // -2^7
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Serial.println(EEPROM.readByte(address));
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EEPROM.writeChar(address, 'A'); // Same as writyByte and readByte
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Serial.println(char(EEPROM.readChar(address)));
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EEPROM.writeUChar(address, 255); // 2^8 - 1
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Serial.println(EEPROM.readUChar(address));
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EEPROM.writeShort(address, -32768); // -2^15
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Serial.println(EEPROM.readShort(address));
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EEPROM.writeUShort(address, 65535); // 2^16 - 1
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Serial.println(EEPROM.readUShort(address));
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EEPROM.writeInt(address, -2147483648); // -2^31
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Serial.println(EEPROM.readInt(address));
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EEPROM.writeUInt(address, 4294967295); // 2^32 - 1
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Serial.println(EEPROM.readUInt(address));
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EEPROM.writeLong(address, -2147483648); // Same as writeInt and readInt
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Serial.println(EEPROM.readLong(address));
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EEPROM.writeULong(address, 4294967295); // Same as writeUInt and readUInt
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Serial.println(EEPROM.readULong(address));
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int64_t value = -9223372036854775808; // -2^63
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EEPROM.writeLong64(address, value);
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value = 0; // Clear value
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value = EEPROM.readLong64(value);
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Serial.printf("0x%08X", (uint32_t)(value >> 32)); // Print High 4 bytes in HEX
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Serial.printf("%08X\n", (uint32_t)value); // Print Low 4 bytes in HEX
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uint64_t Value = 18446744073709551615; // 2^64 - 1
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EEPROM.writeULong64(address, Value);
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Value = 0; // Clear Value
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Value = EEPROM.readULong64(Value);
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Serial.printf("0x%08X", (uint32_t)(Value >> 32)); // Print High 4 bytes in HEX
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Serial.printf("%08X\n", (uint32_t)Value); // Print Low 4 bytes in HEX
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EEPROM.writeFloat(address, 1234.1234);
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Serial.println(EEPROM.readFloat(address), 4);
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EEPROM.writeDouble(address, 123456789.123456789);
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Serial.println(EEPROM.readDouble(address), 8);
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EEPROM.writeBool(address, true);
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Serial.println(EEPROM.readBool(address));
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String sentence = "I love ESP32.";
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EEPROM.writeString(address, sentence);
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Serial.println(EEPROM.readString(address));
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char gratitude[] = "Thank You Espressif!";
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EEPROM.writeString(address, gratitude);
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Serial.println(EEPROM.readString(address));
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// See also the general purpose writeBytes() and readBytes() for BLOB in EEPROM library
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// To avoid data overwrite, next address should be chosen/offset by using "address =+ sizeof(previousData)"
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}
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void loop() {
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// put your main code here, to run repeatedly:
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}
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