Added support for some new custom IHX record types which will be used to implement further bootloader functionality.

Author: fnoble

src/intel_hex.c

@@ -65,10 +65,11 @@ uint8_t ihx_check_line(char line[]) {
 
   checksum = ihx_data_byte(line, byte_count);
 
-  if (record_type > 1)
+  if (record_type > 0x01 && (record_type < 0x22 || record_type > 0x25))
     return IHX_BAD_RECORD_TYPE;
 
-  if (record_type != IHX_RECORD_EOF && (address < USER_CODE_BASE || address > FLASH_SIZE))
+  if ((record_type == IHX_RECORD_DATA || record_type == IHX_RECORD_READ) && \
+      (address < USER_CODE_BASE || address > FLASH_SIZE))
    return IHX_BAD_ADDRESS;
 
   sum = 0;

src/intel_hex.h

@@ -34,6 +34,29 @@
 #define IHX_RECORD_DATA 0x00
 #define IHX_RECORD_EOF  0x01
 
+// Custom record types used to implement some extra bootloader functionality.
+
+// Reset record will reset the page erase map which usually ensures each page is only
+// erased once, allowing for random writes but preventing overwriting of data already written
+// this session.
+// :00000022DE
+#define IHX_RECORD_RESET  0x22
+
+// Erases all of the user code flash pages
+// :00000023DD
+#define IHX_RECORD_ERASE_ALL  0x23
+
+// Erases a single page of the user code flash
+// :01000024xxyy
+// xx - Page number, yy - Checksum
+#define IHX_RECORD_ERASE_PAGE  0x24
+
+// Reads back a section of flash in Intel HEX format
+// :04xxxx24yyyyzz
+// xxxx - Start address, yyyy - Num bytes to read, zz - Checksum
+#define IHX_RECORD_READ  0x25
+
+
 uint8_t hex4(char c);
 uint8_t hex8(char s[]);
 uint16_t hex16(char s[]);