implemented set ir stuff

[my-code/pnx.git] / jtag.c

diff --git a/jtag.c b/jtag.c
index ca2e683..9d05d5f 100644 (file)
--- a/jtag.c
+++ b/jtag.c
@@ -1,6 +1,7 @@
 /*
  * jtag.c - basic jtag stuff (good excercise!)
  *
+ * build: gcc -Wall jtag.c -o jtag
  * author: hackbard@hackdaworld.org
  *
  */
@@ -164,12 +165,34 @@ int jtag_read_data(u8 *p,int bitlen) {
        memset(p,0,bitlen+7/8);
        count=0;
 
+       printf("  <- ");
        while(bitlen) {
                in=jtag_clock(0,0);
                p[count/8]|=((in&1)<<(count%8));
+               printf("%d",p[count/8]&(1<<(count%8))?1:0);
                count+=1;
                bitlen-=1;
        }
+       printf("\n");
+
+       return 0;
+
+}
+
+int jtag_write_data(u8 *p,int bitlen) {
+
+       int count;
+
+       count=0;
+
+       printf("  -> ");
+       while(bitlen) {
+               jtag_clock(0,p[count/8]&(1<<(count%8))?1:0);
+               printf("%d",p[count/8]&(1<<(count%8))?1:0);
+               bitlen-=1;
+               count+=1;
+       }
+       printf("\n");
 
        return 0;
 
@@ -212,9 +235,41 @@ int jtag_chain_init(t_jtag *jtag) {
 
 }
 
+int jtag_set_ir(char *s,int bitlen) {
+
+       u8 ir[MAXDEV*MAXIRLEN/8];
+       int count;
+
+       if(bitlen>=MAXDEV*MAXIRLEN) {
+               printf("instruction register too big!\n");
+               return -1;
+       }
+
+       memset(ir,0,MAXDEV*MAXIRLEN/8*sizeof(u8));
+       count=0;
+
+       printf("set ir: ");
+       while(bitlen) {
+               if(s[count]=='1')
+                       ir[count/8]|=(1<<(count%8));
+               printf("%d",ir[count/8]&(1<<(count%8))?1:0);
+               count+=1;
+               bitlen-=1;
+       }
+       printf("\n");
+
+       jtag_enter_shift_ir();
+       jtag_write_data(ir,count);
+       jtag_leave_shift_ir();
+
+       return 0;
+
+}
+
 int main(int argc,char **argv) {
 
        t_jtag jtag;
+       u8 io[256];
 
        memset(&jtag,0,sizeof(t_jtag));
 
@@ -230,6 +285,12 @@ int main(int argc,char **argv) {
        jtag_chain_init(&jtag);
        printf("done\n\n");
 
+       printf("testing some instructions ...\n\n");
+       jtag_set_ir("000001000001",12);
+       jtag_enter_shift_dr();
+       jtag_read_data(io,64);
+       jtag_leave_shift_dr();
+
        return 0;
 
 }