Add WP control

Author: giminotron5

src/SparkFun_External_EEPROM.cpp

@@ -66,6 +66,22 @@ bool ExternalEEPROM::begin(uint8_t deviceAddress, TwoWire &wirePort)
 
     return true;
 }
+bool ExternalEEPROM::begin(uint8_t WP = LED_BUILTIN, uint8_t deviceAddress, TwoWire &wirePort)
+{
+    pinMode(WP, OUTPUT);
+    digitalWrite(WP, HIGH);
+    settings.wpPin = WP;
+    settings.usingWP = true;
+    settings.i2cPort = &wirePort; // Grab which port the user wants us to use
+    settings.deviceAddress = deviceAddress;
+
+    if (isConnected() == false)
+    {
+        return false;
+    }
+
+    return true;
+}
 
 // Erase entire EEPROM
 void ExternalEEPROM::erase(uint8_t toWrite)
@@ -876,6 +892,9 @@ int ExternalEEPROM::write(uint32_t eepromLocation, const uint8_t *dataToWrite, u
         while (isBusy(settings.deviceAddress) == true) // Poll device's original address, not the modified one
             delayMicroseconds(100); // This shortens the amount of time waiting between writes but hammers the I2C bus
 
+        // Check if we are using Write Protection then disable WP for write access
+        if(settings.usingWP)    digitalWrite(settings.wpPin, LOW);
+
         settings.i2cPort->beginTransmission(i2cAddress);
         if (settings.addressSize_bytes > 1) // Device larger than 16,384 bits have two byte addresses
             settings.i2cPort->write((uint8_t)((eepromLocation + recorded) >> 8)); // MSB
@@ -885,6 +904,8 @@ int ExternalEEPROM::write(uint32_t eepromLocation, const uint8_t *dataToWrite, u
             settings.i2cPort->write(dataToWrite[recorded + x]);
 
         result = settings.i2cPort->endTransmission(); // Send stop condition
+        // Enable Write Protection if we are using WP
+        if(settings.usingWP)    digitalWrite(settings.wpPin, HIGH);
 
         recorded += amtToWrite;
 

src/SparkFun_External_EEPROM.h

@@ -111,6 +111,8 @@ struct struct_memorySettings
     uint8_t writeTime_ms;
     bool pollForWriteComplete;
     uint8_t addressSize_bytes;
+    bool usingWP;
+    uint8_t wpPin;
 };
 
 class ExternalEEPROM
@@ -122,6 +124,8 @@ class ExternalEEPROM
     int write(uint32_t eepromLocation, const uint8_t *dataToWrite, uint16_t blockSize);
 
     bool begin(uint8_t deviceAddress = 0b1010000, TwoWire &wirePort = Wire); // By default use the Wire port
+    bool begin(uint8_t WP, uint8_t deviceAddress = 0b1010000, TwoWire &wirePort = Wire); // By default use the Wire port
+    
     bool isConnected(uint8_t i2cAddress = 255);
     bool isBusy(uint8_t i2cAddress = 255);
     void erase(uint8_t toWrite = 0x00); // Erase the entire memory. Optional: write a given byte to each spot.
@@ -186,6 +190,8 @@ class ExternalEEPROM
         .writeTime_ms = 5, //All EEPROMs seem to have a max write time of 5ms
         .pollForWriteComplete = true,
         .addressSize_bytes = 2, // Default to two address bytes, to support 24xx32 / 4096 byte EEPROMs and larger
+        .usingWP = false,
+        .wpPin = LED_BUILTIN,
     };
 };