bitq: remove the remaining static variables

in_mask and in_idx are just another encoding of the same state information
that is already kept in bitq_in_state.bit_pos so derive them from that
instead of maintaining them separately.

Change-Id: I4ac6bbe923698a8c1090a785b8babcbb90f82931
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/207
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

diff --git a/src/jtag/drivers/bitq.c b/src/jtag/drivers/bitq.c
index 20aead70e2a1a70c2fc6192506ffba5bdbe5b602..064f43b01146696f9e274e8d00a22efb7db3c6eb 100644 (file)
--- a/src/jtag/drivers/bitq.c
+++ b/src/jtag/drivers/bitq.c
@@ -32,7 +32,7 @@ struct bitq_interface* bitq_interface;       /* low level bit queue interface */
 struct bitq_state {
        struct jtag_command *cmd; /* command currently processed */
        int field_idx; /* index of field currently being processed */
-       int bit_pos; /* position of bit curently being processed */
+       int bit_pos; /* position of bit currently being processed */
        int status; /* processing status */
 };
 static struct bitq_state bitq_in_state;
@@ -43,10 +43,6 @@ static struct bitq_state bitq_in_state;
  */
 void bitq_in_proc(void)
 {
-       /* static information preserved between calls to increase performance */
-       static int    in_idx;   /* index of byte being scanned */
-       static uint8_t     in_mask;  /* mask of next bit to be scanned */
-
        struct scan_field* field;
        int           tdo;
 
@@ -62,16 +58,14 @@ void bitq_in_proc(void)
                                field = &bitq_in_state.cmd->cmd.scan->fields[bitq_in_state.field_idx];
                                if (field->in_value)
                                {
-                                       if (bitq_in_state.bit_pos == 0)
-                                       {
-                                               /* initialize field scanning */
-                                               in_mask = 0x01;
-                                               in_idx  = 0;
-                                       }
-
                                        /* field scanning */
                                        while (bitq_in_state.bit_pos < field->num_bits)
                                        {
+                                               /* index of byte being scanned */
+                                               int in_idx = bitq_in_state.bit_pos / 8;
+                                               /* mask of next bit to be scanned */
+                                               uint8_t in_mask = 1 << (bitq_in_state.bit_pos % 8);
+
                                                if ((tdo = bitq_interface->in()) < 0)
                                                {
 #ifdef _DEBUG_JTAG_IO_
@@ -83,13 +77,6 @@ void bitq_in_proc(void)
                                                        field->in_value[in_idx] = 0;
                                                if (tdo)
                                                        field->in_value[in_idx] |= in_mask;
-                                               if (in_mask == 0x80)
-                                               {
-                                                       in_mask = 0x01;
-                                                       in_idx++;
-                                               }
-                                               else
-                                                       in_mask <<= 1;
                                                bitq_in_state.bit_pos++;
                                        }
                                }