Changeset 590 for trunk/platform/generic/wrappers.c

Timestamp:

11/25/08 00:14:46 (4 years ago)

Author:

EWAVR

Message:

+ added initial DNG support
+ added rear curtain flash sync for a570 & sx100is

File:

• trunk/platform/generic/wrappers.c (modified) (1 diff)

trunk/platform/generic/wrappers.c

@@ -720 +720 @@
  return 0;
 }
+
+void reverse_bytes_order(char* start, int count){
+// note, we will go to count rounded up to the nearest 32
+asm volatile(
+        "ldr    r2, =0xFF00FF\n"        // r2 = mask
+        "add    r1, r0, r1\n"           // r1 = start + count
+"LOOP:\n"
+        "ldm    r0, {R4-R11}\n"         // load 8 words
+        
+        // out = ((in>>8) & 0xFF00FF) | ((in&0xFF00FF) << 8);
+        "mov    r3, r4, lsr #8\n"       // r3 = in >> 8
+        "and    r3, r3, r2\n"           // r3 &= 0xFF00FF
+        "and    r4, r4, r2\n"           // r4 = in & 0xFF00FF
+        "orr    r4, r3, r4, asl #8\n" // out = r3 | (r4 << 8)
+
+        "mov    r3, r5, lsr #8\n"
+        "and    r3, r3, r2\n"
+        "and    r5, r5, r2\n"
+        "orr    r5, r3, r5, asl #8\n"
+
+        "mov    r3, r6, lsr #8\n"
+        "and    r3, r3, r2\n"
+        "and    r6, r6, r2\n"
+        "orr    r6, r3, r6, asl #8\n"
+
+        "mov    r3, r7, lsr #8\n"
+        "and    r3, r3, r2\n"
+        "and    r7, r7, r2\n"
+        "orr    r7, r3, r7, asl #8\n"
+
+        "mov    r3, r8, lsr #8\n"
+        "and    r3, r3, r2\n"
+        "and    r8, r8, r2\n"
+        "orr    r8, r3, r8, asl #8\n"
+
+        "mov    r3, r9, lsr #8\n"
+        "and    r3, r3, r2\n"
+        "and    r9, r9, r2\n"
+        "orr    r9, r3, r9, asl #8\n"
+
+        "mov    r3, r10, lsr #8\n"
+        "and    r3, r3, r2\n"
+        "and    r10, r10, r2\n"
+        "orr    r10, r3, r10, asl #8\n"
+
+        "mov    r3, r11, lsr #8\n"
+        "and    r3, r3, r2\n"
+        "and    r11, r11, r2\n"
+        "orr    r11, r3, r11, asl #8\n"
+
+        "stmia  r0!, {r4-r11}\n"        // store and increment
+
+        "cmp    r0, r1\n"
+        "bcc    LOOP\n"
+        :::"r0","r1","r2","r3","r4","r5","r6","r7","r8","r9","r10","r11"
+ );
+}
+