Fixed 20-bit DR support in jtag_trans_n() function.

git-svn-id: https://svn.code.sf.net/p/goodfet/code/trunk@985 12e2690d-a6be-4b82-a7b7-67c4a43b65c8

diff --git a/firmware/apps/jtag/jtag.c b/firmware/apps/jtag/jtag.c
index b813d5d..bf6f8f8 100644 (file)
--- a/firmware/apps/jtag/jtag.c
+++ b/firmware/apps/jtag/jtag.c
@@ -253,8 +253,8 @@ int savedtclk;
 //             subsystem does not want to return to the RUN-TEST/IDLE state between 
 //             setting IR and DR
 uint32_t jtag_trans_n(uint32_t word, 
-                                         uint8_t bitcount, 
-                                         enum eTransFlags flags) 
+                     uint8_t bitcount, 
+                     enum eTransFlags flags) 
 {
        uint8_t bit;
        uint32_t high = (1L << (bitcount - 1));
@@ -325,7 +325,13 @@ uint32_t jtag_trans_n(uint32_t word,
                        word |= (READMISO);
                }
        }
-
+       
+       //This is needed for 20-bit MSP430 chips.
+       //Might break another 20-bit chip, if one exists.
+       if(bitcount==20){
+         word = ((word << 16) | (word >> 4)) & 0x000FFFFF;
+       }
+       
        RESTORETCLK;
 
        if (!(flags & NOEND))