- fix bug with emulated cortex_m3 dcc channel

git-svn-id: svn://svn.berlios.de/openocd/trunk@402 b42882b7-edfa-0310-969c-e2dbd0fdcd60

diff --git a/src/target/cortex_m3.c b/src/target/cortex_m3.c
index 8e8665bc44c4ec4b8cbf4e71981133379c949955..3a567abae43d699cb3e6d62927a65405524607f0 100644 (file)
--- a/src/target/cortex_m3.c
+++ b/src/target/cortex_m3.c
@@ -1372,8 +1372,12 @@ int cortex_m3_dcc_read(swjdp_common_t *swjdp, u8 *value, u8 *ctrl)
        
        /* write ack back to software dcc register
         * signify we have read data */
-       dcrdr = 0;
-       ahbap_write_buf_u16( swjdp, (u8*)&dcrdr, 1, DCB_DCRDR);
+       if (dcrdr & (1 << 0))
+       {
+               dcrdr = 0;
+               ahbap_write_buf_u16( swjdp, (u8*)&dcrdr, 1, DCB_DCRDR);
+       }
+       
        return ERROR_OK;
 }
 
@@ -1413,10 +1417,11 @@ int cortex_m3_handle_target_request(void *priv)
                cortex_m3_dcc_read(swjdp, &data, &ctrl);
                
                /* check if we have data */
-               if (ctrl & (1<<0))
+               if (ctrl & (1 << 0))
                {
                        u32 request;
                        
+                       /* we assume target is quick enough */
                        request = data;
                        cortex_m3_dcc_read(swjdp, &data, &ctrl);
                        request |= (data << 8);