integer directives, fixes #15

Author: ThomasWaldmann

demo.S

@@ -54,6 +54,9 @@ textend:
 data0:      .skip 4, 0x23
 data1:      .space 4, 0x42
 data2:      .skip 4
+datab:      .byte 1, 2, 3, 4
+dataw:      .word 1, 2, 3, 4
+datal:      .long 1, 2, 3, 4
 dataend:
 
             .bss

esp32_ulp/assemble.py

@@ -108,6 +108,19 @@ def d_skip(self, amount, fill=None):
 
     d_space = d_skip
 
+    def append_data(self, wordlen, args):
+        data = [int(arg).to_bytes(wordlen, 'little') for arg in args]
+        self.append_section(b''.join(data))
+
+    def d_byte(self, *args):
+        self.append_data(1, args)
+
+    def d_word(self, *args):
+        self.append_data(2, args)
+
+    def d_long(self, *args):
+        self.append_data(4, args)
+
     def assemble(self, lines):
         for label, opcode, args in self.parse(lines):
             if label is not None: