diff options
Diffstat (limited to 'src/jtag/ft2232.c')
| -rw-r--r-- | src/jtag/ft2232.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/src/jtag/ft2232.c b/src/jtag/ft2232.c index 3075b1b4..a7e4e7b9 100644 --- a/src/jtag/ft2232.c +++ b/src/jtag/ft2232.c @@ -114,6 +114,7 @@ static int comstick_init(void); static int stm32stick_init(void); static int axm0432_jtag_init(void); static int sheevaplug_init(void); +static int icebear_jtag_init(void); /* reset procedures for supported layouts */ static void usbjtag_reset(int trst, int srst); @@ -125,6 +126,7 @@ static void comstick_reset(int trst, int srst); static void stm32stick_reset(int trst, int srst); static void axm0432_jtag_reset(int trst, int srst); static void sheevaplug_reset(int trst, int srst); +static void icebear_jtag_reset(int trst, int srst); /* blink procedures for layouts that support a blinking led */ static void olimex_jtag_blink(void); @@ -146,6 +148,7 @@ ft2232_layout_t ft2232_layouts[] = { "stm32stick", stm32stick_init, stm32stick_reset, NULL }, { "axm0432_jtag", axm0432_jtag_init, axm0432_jtag_reset, NULL }, {"sheevaplug", sheevaplug_init, sheevaplug_reset, NULL }, + { "icebear", icebear_jtag_init, icebear_jtag_reset, NULL }, { NULL, NULL, NULL, NULL }, }; @@ -2661,3 +2664,105 @@ static int ft2232_stableclocks(int num_cycles, jtag_command_t* cmd) return retval; } + +/* --------------------------------------------------------------------- + * Support for IceBear JTAG adapter from Section5: + * http://section5.ch/icebear + * + * Author: Sten, debian@sansys-electronic.com + */ + +/* Icebear pin layout + * + * ADBUS5 (nEMU) nSRST | 2 1| GND (10k->VCC) + * GND GND | 4 3| n.c. + * ADBUS3 TMS | 6 5| ADBUS6 VCC + * ADBUS0 TCK | 8 7| ADBUS7 (GND) + * ADBUS4 nTRST |10 9| ACBUS0 (GND) + * ADBUS1 TDI |12 11| ACBUS1 (GND) + * ADBUS2 TDO |14 13| GND GND + * + * ADBUS0 O L TCK ACBUS0 GND + * ADBUS1 O L TDI ACBUS1 GND + * ADBUS2 I TDO ACBUS2 n.c. + * ADBUS3 O H TMS ACBUS3 n.c. + * ADBUS4 O H nTRST + * ADBUS5 O H nSRST + * ADBUS6 - VCC + * ADBUS7 - GND + */ +static int icebear_jtag_init(void) { + u8 buf[3]; + u32 bytes_written; + + low_direction = 0x0b; /* output: TCK TDI TMS; input: TDO */ + low_output = 0x08; /* high: TMS; low: TCK TDI */ + nTRST = 0x10; + nSRST = 0x20; + + if ((jtag_reset_config & RESET_TRST_OPEN_DRAIN) != 0) { + low_direction &= ~nTRST; /* nTRST high impedance */ + } + else { + low_direction |= nTRST; + low_output |= nTRST; + } + + low_direction |= nSRST; + low_output |= nSRST; + + /* initialize low byte for jtag */ + buf[0] = 0x80; /* command "set data bits low byte" */ + buf[1] = low_output; + buf[2] = low_direction; + LOG_DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]); + + if ( ( ( ft2232_write(buf, 3, &bytes_written) ) != ERROR_OK ) || (bytes_written != 3) ) { + LOG_ERROR("couldn't initialize FT2232 with 'IceBear' layout (low)"); + return ERROR_JTAG_INIT_FAILED; + } + + high_output = 0x0; + high_direction = 0x00; + + + /* initialize high port */ + buf[0] = 0x82; /* command "set data bits high byte" */ + buf[1] = high_output; /* value */ + buf[2] = high_direction; /* all outputs (xRST and xRSTnOE) */ + LOG_DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]); + + if ( ( ( ft2232_write(buf, 3, &bytes_written) ) != ERROR_OK ) || (bytes_written != 3) ) { + LOG_ERROR("couldn't initialize FT2232 with 'IceBear' layout (high)"); + return ERROR_JTAG_INIT_FAILED; + } + + return ERROR_OK; +} + +static void icebear_jtag_reset(int trst, int srst) { + + if (trst == 1) { + low_direction |= nTRST; + low_output &= ~nTRST; + } + else if (trst == 0) { + if ((jtag_reset_config & RESET_TRST_OPEN_DRAIN) != 0) + low_direction &= ~nTRST; + else + low_output |= nTRST; + } + + if (srst == 1) { + low_output &= ~nSRST; + } + else if (srst == 0) { + low_output |= nSRST; + } + + /* command "set data bits low byte" */ + BUFFER_ADD = 0x80; + BUFFER_ADD = low_output; + BUFFER_ADD = low_direction; + LOG_DEBUG("trst: %i, srst: %i, low_output: 0x%2.2x, low_direction: 0x%2.2x", trst, srst, low_output, low_direction); +} |