jt_io.h File Reference

Defines

• #define LPT_DATA_PORT   (port_base)
• #define LPT_STATUS_PORT   (port_base+1)
• #define LPT_CONTROL_PORT   (port_base+2)
• #define LPTCTR_DEFAULT   0x00
• #define inb(P)   0
• #define outb(P, V)
• #define insb(P, A, C)
• #define outsb(P, A, C)
• #define ENTER_IOPERM
• #define LEAVE_IOPERM
• #define DEV_ON   0x2F
• #define DEV_DISABLE   0x7F
• #define DEV_OFF   0x00
• #define TCLK   0x01
• #define TMS   0x02
• #define TRESET   0x04
• #define TDTO   0x08
• #define RESET_OFF   0x0
• #define TDFROM   0x10

Functions

• static void raw_device_on (void)
• static void raw_device_off (void)
• static void raw_device_disable (void)
• static void raw_Tout (int outbyte)
• static char raw_Tin (void)

---

Detailed Description

Support functions to access the JTAG interface via parallel port

---

Define Documentation

#define LPT_DATA_PORT   (port_base)

#define LPT_STATUS_PORT   (port_base+1)

Referenced by tap_reset().

#define LPT_CONTROL_PORT   (port_base+2)

#define LPTCTR_DEFAULT   0x00

#define inb

(

P

)

0

Referenced by tap_reset().

#define outb	(	P,
		V		)

#define insb	(	P,
		A,
		C		)

#define outsb	(	P,
		A,
		C		)

#define ENTER_IOPERM

#define LEAVE_IOPERM

#define DEV_ON   0x2F

DATA 0010 1111 - Power on , set direction and enable signals

#define DEV_DISABLE   0x7F

DATA 0111 1111 - Power on , set direction and disable signals

#define DEV_OFF   0x00

DATA 0000 0000 - Power off

#define TCLK   0x01

TCK - Pin

Referenced by tap_discover_chain(), and tap_raw_io_test().

#define TMS   0x02

TMS - Pin

Referenced by tap_discover_chain(), and tap_raw_io_test().

#define TRESET   0x04

target TRESET - Pin active LOW

Referenced by tap_raw_io_test().

#define TDTO   0x08

to device: at the target device this is the TDI - Pin

Referenced by tap_raw_io_test().

#define RESET_OFF   0x0

#define TDFROM   0x10

from device: at the target device this is the TDO - Pin

---

Function Documentation

static void raw_device_on

(

void

)

[inline, static]

Switch cable on
low level functions to access the Hardware

Parameters:

-

Returns:

-

Referenced by tap_raw_io_test().

static void raw_device_off

(

void

)

[inline, static]

Switch cable off
low level functions to access the Hardware

Parameters:

-

Returns:

-

Referenced by tap_raw_io_test().

static void raw_device_disable

(

void

)

[inline, static]

disable cable
low level functions to access the Hardware

Parameters:

-

Returns:

-

Referenced by tap_raw_io_test().

static void raw_Tout

(

int

outbyte

)

[inline, static]

Set the Jtag outbyte at target.
E.g. set or clear the JTAG output signals TMS, TCK, TDI. low level functions to access the Hardware

Parameters:

outbyte

Returns:

-

Referenced by tap_discover_chain(), and tap_raw_io_test().

static char raw_Tin

(

void

)

[inline, static]

Read the TDO-Pin from the target.
low level functions to access the Hardware

Parameters:

-

Returns:

TDFROM aka TDO

Referenced by tap_discover_chain(), and tap_raw_io_test().