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| author | David Brownell <dbrownell@users.sourceforge.net> | 2010-07-18 17:29:25 -0400 |
|---|---|---|
| committer | David Brownell <db@helium.(none)> | 2010-07-18 17:29:25 -0400 |
| commit | d10f0def80f8837398b9176388ed6110fcebfd2d (patch) | |
| tree | b61f3d04b6427f2129df7c6e102d25cc02e14dc3 /src/jtag/drivers/ft2232.c | |
| parent | b85dcae447581d06013cb7d68f582a8708c3cc50 (diff) | |
| download | openocd+libswd-d10f0def80f8837398b9176388ed6110fcebfd2d.tar.gz openocd+libswd-d10f0def80f8837398b9176388ed6110fcebfd2d.tar.bz2 openocd+libswd-d10f0def80f8837398b9176388ed6110fcebfd2d.tar.xz openocd+libswd-d10f0def80f8837398b9176388ed6110fcebfd2d.zip | |
comments for Luminary ICDI layout
Provide $defines for more of the signals involved in the
Luminary ICDI hardware, and comment some of what's going on.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Diffstat (limited to 'src/jtag/drivers/ft2232.c')
| -rw-r--r-- | src/jtag/drivers/ft2232.c | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/src/jtag/drivers/ft2232.c b/src/jtag/drivers/ft2232.c index bf71fa32..4dcc045c 100644 --- a/src/jtag/drivers/ft2232.c +++ b/src/jtag/drivers/ft2232.c @@ -318,6 +318,9 @@ static const struct ft2232_layout *layout; /** default bitmask values ddriven on DBUS: TCK/TDI/TDO/TMS and GPIOL(0..4) */ static uint8_t low_output = 0x0; + +/* note that direction bit == 1 means that signal is an output */ + /** default direction bitmask for DBUS: TCK/TDI/TDO/TMS and GPIOL(0..4) */ static uint8_t low_direction = 0x0; /** default value bitmask for CBUS GPIOH(0..4) */ @@ -2492,13 +2495,34 @@ static int icdi_jtag_init(void) /* Most Luminary eval boards support SWO trace output, * and should use this "luminary_icdi" layout. + * + * DBUS 0..3 are used for JTAG as usual. GPIOs are used + * to switch between JTAG and SWD, or switch the ft2232 UART + * between (i) the target UART or (ii) SWO trace data. + * + * We come up in JTAG mode and may switch to SWD later (with + * SWO/trace option if SWD is active). + * + * DBUS == GPIO-Lx + * CBUS == GPIO-Hx */ + + +#define ICDI_JTAG_EN (1 << 7) /* ADBUS 7 (a.k.a. DBGMOD) */ +#define ICDI_DBG_ENn (1 << 6) /* ADBUS 6 */ +#define ICDI_SRST (1 << 5) /* ADBUS 5 */ +#define ICDI_TDI (1 << 2) /* ADBUS 2 (INPUT) */ + +#define ICDI_SWO_EN (1 << 4) /* BDBUS 4 */ +#define ICDI_TX_SWO (1 << 1) /* BDBUS 1 */ + nTRST = 0x0; nTRSTnOE = 0x00; - nSRST = 0x20; + nSRST = ICDI_SRST; nSRSTnOE = 0x20; - low_output = 0x88; - low_direction = 0xcb; + + low_output = 0x08 | ICDI_JTAG_EN; + low_direction = 0xcb | ICDI_JTAG_EN; return ftx232_dbus_write(); } |