Remove test commands

firmware/src/commands.c

@@ -6,6 +6,7 @@
 
 #include <string.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <util/delay.h>
 
@@ -36,14 +37,6 @@ void executeCommand(CommandLine cmdLine) {
         // ERASE command: Takes a hex address range as argument and writes 0x00 bytes to the specified range.
         commandErase(cmdLine.arg);
     }
-    else if (strcmp(cmdLine.command, "TESTREAD") == 0) {
-        // TESTREAD command: for testing purposes, reads a few bytes and returns them in a human readable format.
-        commandTestRead();
-    }
-    else if (strcmp(cmdLine.command, "TESTWRITE") == 0) {
-        // TESTWRITE command: for testing purposes, writes a few bytes
-        commandTestWrite(cmdLine.arg);
-    }
     else {
         // unknown command: return error message
         uartPutLine("ERROR invalid command");
@@ -79,11 +72,6 @@ void commandHelp() {
     uartPutLine("HELP - READ 0000:0FFF");
     uartPutLine("HELP - WRITE 0000");
     uartPutLine("HELP - ERASE 0000:0FFF");
-
-    // TODO remove those
-    uartPutLine("HELP - TESTREAD (only for testing)");
-    uartPutLine("HELP - TESTWRITE (only for testing)");
-
     uartPutLine("OK");
 }
 
@@ -102,14 +90,12 @@ void commandRead(char* arg) {
 
     uartPutLine("OK");
 
-    uint8_t byteBuffer[DATA_BLOCK_SIZE];
-    DataBuffer buffer = {
-        .data = byteBuffer,
-        .maxSize = DATA_BLOCK_SIZE,
-        .bytes = 0
-    };
+    // Create data buffer
+    DataBuffer buffer;
 
     do {
+        buffer.bytes = 0;
+
         // Read a single block with up to DATA_BLOCK_SIZE bytes
         Address nextAddress = eepromReadBlock(range, &buffer);
         range.isValid = nextAddress.isValid;
@@ -120,16 +106,16 @@ void commandRead(char* arg) {
             // First the size of the package (1 byte) followed by the data bytes
             uartPutChar(buffer.bytes);
 
-            for (int i = 0; i < buffer.bytes; i++) {
+            for (uint8_t i = 0; i < buffer.bytes; i++) {
                 uartPutChar(buffer.data[i]);
             }
         } else {
             // Fancy ASCII output
-            uartPutChar('<');
-            uartPutInteger(buffer.bytes);
+            uartPutString("<0x");
+            uartPutHexByte(buffer.bytes);
             uartPutChar('>');
 
-            for (int i = 0; i < buffer.bytes; i++) {
+            for (uint8_t i = 0; i < buffer.bytes; i++) {
                 uartPutChar(' ');
                 uartPutHexByte(buffer.data[i]);
             }
@@ -158,17 +144,12 @@ void commandWrite(char* arg) {
         return;
     }
 
-    // Create data buffer
-    uint8_t byteBuffer[DATA_BLOCK_SIZE];
-    DataBuffer buffer = {
-        .data = byteBuffer,
-        .maxSize = DATA_BLOCK_SIZE,
-        .bytes = 0
-    };
-
     // "OK" indicates that data can be sent now.
     uartPutLine("OK START");
 
+    // Create data buffer
+    DataBuffer buffer;
+
     Address currentAddress = startAddress;
     uint8_t block_length = 0;
 
@@ -179,10 +160,8 @@ void commandWrite(char* arg) {
         // Read and check block length
         block_length = uartGetChar();
 
-        if (block_length > buffer.maxSize) {
-            uartPutString("ERROR maximal block size is: ");
-            uartPutInteger(buffer.maxSize);
-            uartPutLine(NULL);
+        if (block_length > DATA_BLOCK_SIZE) {
+            uartPutLine("ERROR maximal block size is: " STR(DATA_BLOCK_SIZE));
             return;
         }
 
@@ -195,9 +174,6 @@ void commandWrite(char* arg) {
         if (buffer.bytes > 0) {
             currentAddress = eepromWriteBlock(currentAddress, buffer);
 
-            // TODO wait necessary?
-            //_delay_ms(100);
-
             if (!currentAddress.isValid) {
                 uartPutLine("ERROR reached end of EEPROM while writing block");
                 return;
@@ -219,54 +195,28 @@ 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;
     }
 
-// TESTREAD command: for testing purposes, reads a few bytes and returns them in a human readable format.
-void commandTestRead() {
-    eepromSetReadMode();
+    // Parse address(es)
+    AddressRange range = parseAddressRange(arg);
+    if (!range.isValid || range.to < range.from) {
+        uartPutLine("ERROR invalid address format");
+        return;
+    }
 
-    for (uint8_t i = 0x00; i < 0x20; i++) {
-        uartPutString("TESTREAD 0x");
-        uartPutHexByte(i);
-        uartPutString(": ");
+    uint32_t bytesErased = eepromEraseBlock(range);
 
-        uint8_t byte = eepromReadByte(i);
-
-        if (byte >= 32 && byte <= 126) {
-            uartPutChar(byte);
+    if (bytesErased == 0) {
+        uartPutLine("ERROR 0 bytes erased");
     } else {
-            uartPutChar('?');
-        }
-
-        uartPutString(" (0x");
-        uartPutHexByte(byte);
-        uartPutLine(")");
+        char outBuffer[16];
+        snprintf(outBuffer, 16, "%lu", bytesErased);
+        uartPutString("OK erased ");
+        uartPutString(outBuffer);
+        uartPutLine(" bytes");
     }
 }
-
-// TESTWRITE command: for testing purposes, writes a few bytes
-void commandTestWrite(char* arg) {
-    char str[] = "Ohai world";
-    address_t addr = 0x00;
-
-    char* writeStr = str;
-    if (arg != NULL) {
-        writeStr = arg;
-    }
-
-    eepromSetWriteMode();
-
-    // write input line instead of static string
-    for (char* p = writeStr; *p != '\0'; p++) {
-        eepromWriteByte(addr, *p);
-        //_delay_ms(100);
-        addr++;
-    }
-
-    // TODO necessary?
-    _delay_ms(100);
-
-    uartPutLine("TESTWRITE success");
-}

firmware/src/commands.h

@@ -12,8 +12,4 @@ void commandRead(char* arg);
 void commandWrite(char* arg);
 void commandErase();
 
-// TODO commands only for testing
-void commandTestRead();
-void commandTestWrite(char* arg);
-
 #endif /* COMMANDS_H_ */

firmware/src/common.h

@@ -8,6 +8,10 @@
 // Define macro for NOP instruction
 #define _NOP() __asm__ __volatile__ ("nop");
 
+// Define macro to convert a preprocessor constant to a string literal
+#define STR_(x) #x
+#define STR(x) STR_(x)
+
 // Define type for EEPROM addresses
 typedef uint16_t address_t;
 
@@ -28,12 +32,11 @@ typedef struct {
 } AddressRange;
 
 // Define type for a block of data (bytes)
+#define DATA_BLOCK_SIZE 64
+
 typedef struct {
-    uint8_t* data;
-    uint8_t maxSize;
+    uint8_t data[DATA_BLOCK_SIZE];
     uint8_t bytes;
 } DataBuffer;
 
-#define DATA_BLOCK_SIZE 64
-
 #endif /* COMMON_H_ */

firmware/src/eeprom.c

@@ -132,7 +132,7 @@ Address eepromReadBlock(AddressRange addressRange, DataBuffer* buffer) {
         highestAddress = HIGHEST_VALID_ADDRESS;
     }
 
-    while (currentAddress <= highestAddress && buffer->bytes < buffer->maxSize) {
+    while (currentAddress <= highestAddress && buffer->bytes < DATA_BLOCK_SIZE) {
         buffer->data[buffer->bytes++] = eepromReadByte(currentAddress++);
 
         // Handle integer overflow
@@ -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

@@ -5,10 +5,6 @@
 #include "common.h"
 #include <avr/io.h>
 
-// Define address length
-// TODO 15 or 16?
-#define ADDRESS_LENGTH 15
-
 // Macros for IO pins
 #define EEP_ADDR_LOW_PORT  PORTC
 #define EEP_ADDR_LOW_DDR   DDRC
@@ -46,4 +42,7 @@ 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_ */

firmware/src/parsing.c

@@ -13,7 +13,7 @@
 
 // Read and parse command line and dispatch command
 void parseNextCommand() {
-    const int bufferLength = 80;
+    const int bufferLength = 40;
     char buffer[bufferLength];
 
     // Read next command

firmware/src/uart.c

@@ -4,8 +4,15 @@
 #include <avr/io.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <util/setbaud.h>
 
+// Hexadecimal digit lookup table
+static const char hexDigitLookupTable[] = {
+    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
+};
+
 // Initialize UART
 void uartInit() {
     // Set Baud register
@@ -56,18 +63,12 @@ void uartPutLine(char* data) {
     uartPutChar('\n');
 }
 
-// Convert an integer to decimal ASCII and transmit
-void uartPutInteger(int value) {
-    char outBuffer[32];
-    snprintf(outBuffer, 32, "%d", value);
-    uartPutString(outBuffer);
-}
-
 // Convert a byte to hexadecimal ASCII and transmit
 void uartPutHexByte(uint8_t byte) {
-    char outBuffer[8];
-    snprintf(outBuffer, 8, "%02hhX", byte);
-    uartPutString(outBuffer);
+    // First hex digit: most significant 4 bits
+    uartPutChar(hexDigitLookupTable[(byte >> 4) & 0x0f]);
+    // Second hex digit: least significant 4 bits
+    uartPutChar(hexDigitLookupTable[byte & 0x0f]);
 }
 
 // Receive a single character (blocking)

firmware/src/uart.h

@@ -16,9 +16,6 @@ void uartPutString(char* data);
 // Transmit a string followed by a line break
 void uartPutLine(char* data);
 
-// Convert an integer to decimal ASCII and transmit
-void uartPutInteger(int value);
-
 // Convert a byte to hexadecimal ASCII and transmit
 void uartPutHexByte(uint8_t byte);