Implement READ command (for now with ASCII output)

firmware/src/commands.c

@@ -6,6 +6,7 @@
 
 #include <string.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <util/delay.h>
 
@@ -57,8 +58,33 @@ void commandRead(char* arg) {
         return;
     }
 
-    // TODO read data and output it
-    uartPutString("ERR not implemented\n");
+    uartPutString("OK\n");
+
+    uint8_t byteBuffer[DATA_BLOCK_SIZE];
+    DataBuffer buffer = {
+        .data = byteBuffer,
+        .maxSize = DATA_BLOCK_SIZE,
+        .bytes = 0
+    };
+
+    do {
+        // Read a single block with up to DATA_BLOCK_SIZE bytes
+        range.from = eepromReadBlock(range, &buffer);
+
+        // TODO binary output
+
+        // ASCII output
+        char outBuffer[20];
+        sprintf(outBuffer, "<%d>", buffer.bytes);
+        uartPutString(outBuffer);
+
+        for (int i = 0; i < buffer.bytes; i++) {
+            sprintf(outBuffer, " %02X", buffer.data[i]);
+            uartPutString(outBuffer);
+        }
+
+        uartPutChar('\n');
+    } while (buffer.bytes > 0);
 }
 
 void commandWrite(char* arg) {

firmware/src/common.h

@@ -11,6 +11,9 @@
 // Define type for EEPROM addresses
 typedef uint16_t address_t;
 
+// Define highest valid address for the EEPROM
+#define HIGHEST_VALID_ADDRESS 0x7fff
+
 // Type definition for address ranges (from-to)
 typedef struct {
     bool isValid;
@@ -18,4 +21,13 @@ typedef struct {
     address_t to;
 } AddressRange;
 
+// Define type for a block of data (bytes)
+typedef struct {
+    uint8_t* data;
+    uint8_t maxSize;
+    uint8_t bytes;
+} DataBuffer;
+
+#define DATA_BLOCK_SIZE 64
+
 #endif /* COMMON_H_ */

firmware/src/eeprom.c

@@ -113,3 +113,37 @@ void eepromWriteByte(address_t address, uint8_t data) {
     // Write pulse width high (50ns)
     _NOP();
 }
+
+// Read multiple bytes from EEPROM into a buffer
+address_t eepromReadBlock(AddressRange addressRange, DataBuffer* buffer) {
+    // Set read mode
+    eepromSetReadMode();
+
+    buffer->bytes = 0;
+
+    address_t currentAddress = addressRange.from;
+    address_t highestAddress = addressRange.to;
+
+    if (highestAddress > HIGHEST_VALID_ADDRESS) {
+        highestAddress = HIGHEST_VALID_ADDRESS;
+    }
+
+    while (currentAddress <= highestAddress && buffer->bytes < buffer->maxSize) {
+        buffer->data[buffer->bytes++] = eepromReadByte(currentAddress++);
+    }
+
+    return currentAddress;
+}
+
+// // Write multiple bytes from a buffer to EEPROM
+// address_t eepromWriteBlock(address_t currentAddress, DataBuffer buffer) {
+//     // Set write mode
+//     eepromSetWriteMode();
+
+//     for (uint8_t i = 0; currentAddress <= HIGHEST_VALID_ADDRESS && i < buffer.bytes; i++) {
+//         eepromWriteByte(currentAddress++, buffer.data[i]);
+//         // TODO address overflow
+//     }
+
+//     return currentAddress;
+// }

firmware/src/eeprom.h

@@ -40,4 +40,10 @@ uint8_t eepromReadByte(address_t address);
 // Write byte (assumes we're in write mode)
 void eepromWriteByte(address_t address, uint8_t data);
 
+// Read multiple bytes from EEPROM into a buffer
+address_t eepromReadBlock(AddressRange addressRange, DataBuffer* buffer);
+
+// // Write multiple bytes from a buffer to EEPROM
+// address_t eepromWriteBlock(address_t addressRange, DataBuffer buffer);
+
 #endif /* EEPROM_H_ */