From: hackbard <hackbard>
Date: Sat, 27 Jan 2007 07:43:59 +0000 (+0000)
Subject: well, should imho work, i bet it wont though!
X-Git-Url: https://hackdaworld.org/gitweb/?p=my-code%2Ffpga.git;a=commitdiff_plain;h=0544bb04468bc99232d9cad31d2238d23488e524

well, should imho work, i bet it wont though!
---

diff --git a/jtag/parallel.c b/jtag/parallel.c
index 759daea..9020606 100644
--- a/jtag/parallel.c
+++ b/jtag/parallel.c
@@ -1,19 +1,123 @@
 /*
- * jtag via parallel
+ * doing jtag via the
+ *
+ * 'low cost jtag parallel programming cable'
  *
  * author: hackbard@hackdaworld.org
  *
  */
 
-#define XILINX_LOW_COST_CABLE			0x00
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/io.h>
 
-#define ALTERA_BYTE_BLASTER
+#define PARPORT	0x378
 
+#define TMS	(1<<2)	/* d2 */
+#define TDI	(1<<0) /* d0 */
+#define TCK	(1<<1) /* d1 */
+#define TDO	(1<<4) /* select in */
 
+#define JTAG_INITIALIZED	0x01
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
+#define FALSE 0
+#define TRUE 1
 
-#include <sys/io.h>
+typedef unsigned char u8;
+typedef unsigned short int u16;
+typedef unsigned int u32;
+
+typedef struct s_jtag {
+	u16 port;
+	u8 status;
+} t_jtag;
+
+int jtag_set_port(t_jtag *jtag,u16 port) {
+
+	jtag->port=port;
+
+	return 0;
+}
+
+int jtag_init(t_jtag *jtag) {
+
+	int ret;
+	u8 out;
+
+	out=0;
+
+	/* permissions */
+	ret=ioperm(jtag->port,2,TRUE);
+	if(ret<0) {
+		perror("ioperm");
+		return -1;
+	}
+
+	/* set tck to zero */
+	outb(out,jtag->port);
+
+	return 0;
+}
+
+u8 jtag_act(t_jtag *jtag,u8 tms,u8 tdi) {
+
+	u8 out;
+	u8 tdo;
+	int i;
+
+	out=0;
+
+	if(tms) out|=(1<<TMS);
+	if(tdi) out|=(1<<TDI);
+
+	/* with tck high */
+	outb((out|TCK),jtag->port);
+
+	/* with tck low */
+	outb(out,jtag->port);
+
+	tdo=inb(jtag->port+1);
+printf("%0x2 %c | ",tdo,((tdo<0x20)|(tdo>0x7e))?'.':tdo);
+for(i=0;i<8;i++) printf("%d ",((tdo<<(7-i))&0x01)?1:0);
+printf("\n");
+
+	return tdo;
+}
+
+int jtag_reset(t_jtag *jtag) {
+
+	int i;
+
+	for(i=0;i<5;i++) jtag_act(jtag,1,0);
+
+	return 0;
+}
+
+int jtag_shift_dr(t_jtag *jtag) {
+
+	/* assume 'test logic reset' status */
+
+	jtag_act(jtag,0,0);
+	jtag_act(jtag,1,0);
+	jtag_act(jtag,0,0);
+	jtag_act(jtag,0,0);
+
+	return 0;
+}
+
+int main(int argc,char **argv) {
+
+	t_jtag jtag;
+	int i;
+
+	jtag_init(&jtag);
+
+	jtag_reset(&jtag);
+
+	jtag_shift_dr(&jtag);
+
+	for(i=0;i<32;i++) jtag_act(&jtag,0,0);
 
+	return 0;
+}