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hardware:jtag 2008/08/17 01:55 hardware:jtag 2017/09/06 18:38 current
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  * You need a JTAG cable   * You need a JTAG cable
-===== JTAG Interface scheme for DNS-323 =====+Two types of jtag cables are discussed here: 
 +1: The "Wiggler" style, which is basically a conversion between the jtag interface on the embedded system and the parralel (printer) port on your PC.  
 +2: The "Amontec JTAGKey Tiny" (other commercially models may or may not work), which provides a USB connection at the PC side. 
 +Comparison: pro method 1: cheaper, Pro method 2: less soldering (faster?)
-{{hardware:dns-323-jtag.pdf| JTAG Port Pinout and Wiggler style Programmer}} 
 +===== JTAG Pinout Reference =====
 +**TOP VIEW**
 +**Note Pin 1 is square pin**
 +^ Signal ^ Pin ^ Pin ^ Signal ^
 +|  sRST|  9|  10|  TCK|
 +|  TDO|  7|  8|  TCK|
 +|  GND|  5|  6|  TMS|
 +|  GND|  3|  4|  TDI|
 +|  Vcc|  1|  2| nTRST|
-==== Amontec JTAGKey Tiny ==== +**Note nTRST must be sent a buffered high signal to use JTAG**
-[http://www.amontec.com/jtagkey-tiny.shtml| JTAGKey Tiny]+
-Solder 4K7 Ohm resistors @  R202 R201 R200 +Be aware that this pinout seems to be based on the DNS 323 version B2 and the CH3SNAS. The DNS-323 version A1 has the same space for a header, but the location of the surrounding resistors is different. This might or might not have consequences for the validity of the pinout as above. (Anyone: more information on the A1 rev.?) 
-Connect JTAG pins just like the Wrigler port, and also bridge R199 (EN pin to VCC) to enable JTAG.+Rev A1 is the same pinout, smd resistors are already attached, just add header.
-openocd.cfg: 
 +
 +===== JTAG Interface scheme for DNS-323 with the Wiggler port=====
 +See the attached pinout:
 +{{:hardware:dns-323-jtag.png}}
 +
 +
 +
 +==== openocd configuration file for the Wiggler method ====
 +
 +openocd.cfg
<code> <code>
 +cat openocd.cfg
 +#daemon configuration
telnet_port 4444 telnet_port 4444
gdb_port 3333 gdb_port 3333
-interface ft2232 +#interface 
-ft2232_device_desc "Amontec JTAGkey" +interface parport 
-ft2232_layout jtagkey +parport_port 0x378 
-ft2232_vid_pid 0x0403 0xcff8 +parport_cable wiggler 
-jtag_speed 3 +#parport_cable old_amt_wiggler 
 +jtag_speed 1 
 +#use combined on interfaces or targets that can't set TRST/SRST separately 
 +#reset_config trst_and_srst srst_pulls_trst 
 +#reset_config trst_only 
 +#reset_config trst_and_srst combined
reset_config srst_only reset_config srst_only
 +
 +#jtag scan chain
 +#format L IRC IRCM IDCODE (Length, IR Capture, IR Capture Mask, IDCODE)
jtag_device 4 0x1 0xf 0xe jtag_device 4 0x1 0xf 0xe
Line 47: Line 75:
# planing with flash code - work in progress # planing with flash code - work in progress
-#working_area 0 0x00400000 0x40000 nobackup+working_area 0 0x00400000 0x40000 nobackup
#          driver  addr      size    chip_width  bus_width  options #          driver  addr      size    chip_width  bus_width  options
-flash bank cfi      0xff800000 0x800000 1          2          0+flash bank cfi      0xff800000 0x400000 1          2          0
#target configuration #target configuration
Line 57: Line 85:
sleep 500 sleep 500
halt halt
- 
</code> </code>
-===== JTAG Pinout Reference ===== 
-**TOP VIEW** 
-**Note Pin 1 is square pin** 
-^ Signal ^ Pin ^ Pin ^ Signal ^ +===== JTAG Interface scheme for DNS-323 with the Amontec JTAGKey Tiny ===== 
-| sRST|  9|  10|  TCK| +[[http://www.amontec.com/jtagkey-tiny.shtml| JTAGKey Tiny]]
-|   TDO|  7|  8|  TCK| +
-|  GND|  5|  6|  TMS| +
-|  GND|  3|  4|  TDI| +
-|  Vcc|  1|  2| nTRST|+
-**Note nTRST must be sent a buffered high signal to use JTAG**+Solder 47 KOhm resistors @  R202 R201 R200 
 +Connect JTAG pins just like the Wiggler port, and also bridge R199 (EN pin to VCC) to enable JTAG. 
 +Refer to the top half of the pdf as attached in the previous section. 
 +Pinout of the jtagkey tiny is available [[http://www.amontec.com/jtag_pinout.shtml| here]]
 +==== openocd configuration file for the Amontec JTAGKey Tiny ====
-===== OpenOCD ===== +openocd.cfg
- +
-==== openocd.cfg ====+
<code> <code>
-cat openocd.cfg 
-#daemon configuration 
telnet_port 4444 telnet_port 4444
gdb_port 3333 gdb_port 3333
-#interface +interface ft2232 
-interface parport +ft2232_device_desc "Amontec JTAGkey" 
-parport_port 0x378 +ft2232_layout jtagkey 
-parport_cable wiggler +ft2232_vid_pid 0x0403 0xcff8 
-#parport_cable old_amt_wiggler +jtag_speed 3
-jtag_speed 1 +
-#use combined on interfaces or targets that can't set TRST/SRST separately +
-#reset_config trst_and_srst srst_pulls_trst +
-#reset_config trst_only +
-#reset_config trst_and_srst combined +
-reset_config srst_only+
-#jtag scan chain +reset_config srst_only
-#format L IRC IRCM IDCODE (Length, IR Capture, IR Capture Mask, IDCODE)+
jtag_device 4 0x1 0xf 0xe jtag_device 4 0x1 0xf 0xe
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# planing with flash code - work in progress # planing with flash code - work in progress
-working_area 0 0x00400000 0x40000 nobackup+#working_area 0 0x00400000 0x40000 nobackup
#          driver  addr      size    chip_width  bus_width  options #          driver  addr      size    chip_width  bus_width  options
-flash bank cfi      0xff800000 0x400000 1          2          0+flash bank cfi      0xff800000 0x800000 1          2          0
#target configuration #target configuration
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sleep 500 sleep 500
halt halt
 +
</code> </code>
 +
 +
 +===== OpenOCD =====
 +
==== Running OpenOCD ==== ==== Running OpenOCD ====
Line 153: Line 171:
</code> </code>
-===== TODO ======+===== TODO =====
  * The flash code in OPENOCD does not understand CFI mode 2 access. However this looks to be easy to fix. There is an early patch that attempted to address this but was never added into the project release. This code provides a good starting point.   * The flash code in OPENOCD does not understand CFI mode 2 access. However this looks to be easy to fix. There is an early patch that attempted to address this but was never added into the project release. This code provides a good starting point.
===== Links ===== ===== Links =====
-  * [[http://forum.dsmg600.info/t250-DNS323-JTAG-Pinout-interface-details.html|Forum thread]]+  * [[http://dns323.kood.org/forum/t250-DNS323-JTAG-Pinout-interface-details.html|Forum thread]]

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