I was wondering about what else I could do with the JTAG Adaptor.
we all know the pinout of the JTAG connector
http://www.plugcomputer.org/plugwiki/index.php/GuruPlug#Pinouts_for_the_Guruplug_connectorsJTAG
This is the larger, 8-pin connector. The layout is:
Pin Line
1 GND
2 JT_TDI
3 RST_SYS_OUT
4 JT_TDO
5 JT_CLK
6 JT_TMS_CPU
7 JT_RESETn
8 3.3V
But how about these board mounted pins? Is the UART serial also available from here? unfortunately (as I'd need a TTL-USB device with a 3.3V VCC right now) it's not except for GND:
They are marked 12 upwards, 19 and 20 down. If you take a close look, you'll see the numbers on the board:
| 1: black (3.3V) | 2:nc |
| 3:brown (JT_RESETn) | 4:red (GND)/black(uart) |
| 5:purple (JT_TDI) | 6:red (GND)/black(uart) |
| 7:white (JT_TMS_CPU) | 8:red (GND)/black(uart) |
| 9:yellow (JT_CLK) | 10:red (GND)/black(uart) |
| 11:green (JT_TDO) | 12:red (GND)/black(uart) |
| 13:blue (RST_SYS_OUT) | 14:red (GND)/black(uart) |
| 15:nc | 16:red (GND)/black(uart) |
| 17:nc | 18:red (GND)/black(uart) |
| 19:nc | 20:red (GND)/black(uart) |
it's a pity the engineers preferred to connect GND to after all nine pins instead of also mounting up these three UART pins.
anyway, hope this may be helpfull
