card_extract_bits() take the start bit argument as defined in public SanDisk specifications for SD and MMC, i.e. bit 0 is the lsb

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21600 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 7 insertions, 2 deletions

diff --git a/firmware/hotswap.c b/firmware/hotswap.c
index 97c162ce39..ec298f7243 100644
--- a/firmware/hotswap.c
+++ b/firmware/hotswap.c
@@ -33,9 +33,14 @@ unsigned long card_extract_bits(
     unsigned int start,     /* bit no. to start reading  */
     unsigned int size)      /* how many bits to read */
 {
-    unsigned int long_index = start / 32;
-    unsigned int bit_index = start % 32;
+    unsigned int long_index, bit_index;
     unsigned long result;
+
+    /* we assume words of CSD/CID are stored least significant word first */
+    start = 127 - start;
+
+    long_index = start / 32;
+    bit_index = start % 32;
     
     result = p[long_index] << bit_index;