add utilities for ARIEL ASW on-board image generation

Ccs/tools/asw_upload/asw_image_lib_ariel.py

+import crcmod
+import ctypes
+
+
+HEADER_VERSION = 0x01
+FILLER = 0x00
+
+N_SECT_HEADERS = 8
+SECTION_HEADER_SIZE = 16
+HEADER_SIZE = 8 + N_SECT_HEADERS * SECTION_HEADER_SIZE
+
+MEM_MRAM_ID = 2
+MEM_MRAM_START = 0x10000000
+MEM_MRAM_SIZE = 0x200000
+
+MEM_RAM_ID = 6
+MEM_RAM_START = 0x40000000
+MEM_RAM_SIZE = 0x1000000
+
+ASW_IMG_OFFSET = 0x80000
+
+
+puscrc = crcmod.predefined.mkPredefinedCrcFun('crc-ccitt-false')
+
+
+class SectionHeaderFields(ctypes.BigEndianStructure):
+    _pack_ = 1
+    _fields_ = [("TARGET_ADDR", ctypes.c_uint32),
+                ("SIZE", ctypes.c_uint32),
+                ("SOURCE_ADDR", ctypes.c_uint32),
+                ("SOURCE_SECT_ID", ctypes.c_uint8),
+                ("FILLER", ctypes.c_uint8),
+                ("CRC16", ctypes.c_uint16)]
+
+
+class ImageHeaderFields(ctypes.BigEndianStructure):
+    _pack_ = 1
+    _fields_ = [("HEADER_CRC16", ctypes.c_uint16),
+                ("HEADER_VERSION", ctypes.c_uint8),
+                ("FILLER", ctypes.c_uint8),
+                ("ENTRY_POINT", ctypes.c_uint32),
+                ("SECTION1", SectionHeaderFields),
+                ("SECTION2", SectionHeaderFields),
+                ("SECTION3", SectionHeaderFields),
+                ("SECTION4", SectionHeaderFields),
+                ("SECTION5", SectionHeaderFields),
+                ("SECTION6", SectionHeaderFields),
+                ("SECTION7", SectionHeaderFields),
+                ("SECTION8", SectionHeaderFields)]
+
+
+class ImageHeader(ctypes.Union):
+    _pack_ = 1
+    _fields_ = [("fields", ImageHeaderFields),
+                ("bin", ctypes.c_ubyte * HEADER_SIZE)]
+    
+    def __init__(self, memid, entrypoint, data, data_addr_offset=HEADER_SIZE):
+        
+        super().__init__()
+    
+        self.fields.HEADER_VERSION = HEADER_VERSION
+        self.fields.FILLER = FILLER
+        self.fields.ENTRY_POINT = entrypoint
+
+        self.set_section(1, data, entrypoint, data_addr_offset, memid)
+
+        self.fields.HEADER_CRC16 = puscrc(bytes(self.bin[2:]))
+
+    def set_section(self, n, data, target_addr, source_addr, memid):
+
+        sect = getattr(self.fields, "SECTION{}".format(n))
+        sect.TARGET_ADDR = target_addr
+        sect.SOURCE_ADDR = source_addr
+        sect.SOURCE_SECT_ID = memid
+
+        # assert len(data) % 4 == 0
+
+        sect.SIZE = len(data)
+        sect.CRC16 = puscrc(data)
+
+
+class AswImage:
+
+    def __init__(self, memid, entrypoint, aswfile, skip_bytes=0):
+
+        assert isinstance(aswfile, str)
+
+        data = open(aswfile, 'rb').read()[skip_bytes:]
+
+        self.header = ImageHeader(memid, entrypoint, data)
+        self.data = data
+
+    @property
+    def img(self):
+        return bytes(self.header) + self.data
+
+    @property
+    def size(self):
+        """Total size of ASW image, including header"""
+        return len(self.img)