Implement ERASE command

firmware/src/commands.c

@@ -6,6 +6,7 @@
 
 #include <string.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <util/delay.h>
 
@@ -219,8 +220,30 @@ void commandWrite(char* arg) {
     uartPutLine("OK END");
 }
 
-void commandErase() {
-    uartPutLine("ERROR not implemented");
+void commandErase(char* arg) {
+    if (arg == NULL) {
+        uartPutLine("ERROR ERASE needs a start address");
+        return;
+    }
+
+    // Parse address(es)
+    AddressRange range = parseAddressRange(arg);
+    if (!range.isValid || range.to < range.from) {
+        uartPutLine("ERROR invalid address format");
+        return;
+    }
+
+    uint32_t bytesErased = eepromEraseBlock(range);
+
+    if (bytesErased == 0) {
+        uartPutLine("ERROR 0 bytes erased");
+    } else {
+        char outBuffer[16];
+        snprintf(outBuffer, 16, "%lu", bytesErased);
+        uartPutString("OK erased ");
+        uartPutString(outBuffer);
+        uartPutLine(" bytes");
+    }
 }
 
 // TESTREAD command: for testing purposes, reads a few bytes and returns them in a human readable format.

firmware/src/eeprom.c

@@ -172,3 +172,34 @@ Address eepromWriteBlock(Address startAddress, DataBuffer buffer) {
 
     return (Address) {true, currentAddress};
 }
+
+// Erase block of data on the EEPROM
+uint32_t eepromEraseBlock(AddressRange addressRange) {
+    // Set write mode
+    eepromSetWriteMode();
+
+    if (!addressRange.isValid) {
+        return 0;
+    }
+
+    address_t currentAddress = addressRange.from;
+    address_t highestAddress = addressRange.to;
+
+    if (highestAddress > HIGHEST_VALID_ADDRESS) {
+        highestAddress = HIGHEST_VALID_ADDRESS;
+    }
+
+    uint32_t bytesErased = 0;
+
+    while (currentAddress <= highestAddress) {
+        eepromWriteByte(currentAddress++, 0x00);
+        bytesErased++;
+
+        // Handle integer overflow
+        if (currentAddress == 0) {
+            break;
+        }
+    }
+
+    return bytesErased;
+}

firmware/src/eeprom.h

@@ -46,4 +46,7 @@ Address eepromReadBlock(AddressRange addressRange, DataBuffer* buffer);
 // Write multiple bytes from a buffer to EEPROM
 Address eepromWriteBlock(Address startAddress, DataBuffer buffer);
 
+// Erase block of data on the EEPROM
+uint32_t eepromEraseBlock(AddressRange addressRange);
+
 #endif /* EEPROM_H_ */