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dap.c
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dap.c
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/*
* Copyright (c) 2016-2021, Alex Taradov <alex@taradov.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*- Includes ----------------------------------------------------------------*/
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include "dap_config.h"
#include "dap.h"
/*- Definitions -------------------------------------------------------------*/
#define ARRAY_SIZE(x) ((int)(sizeof(x) / sizeof(0[x])))
enum
{
ID_DAP_INFO = 0x00,
ID_DAP_HOST_STATUS = 0x01,
ID_DAP_CONNECT = 0x02,
ID_DAP_DISCONNECT = 0x03,
ID_DAP_TRANSFER_CONFIGURE = 0x04,
ID_DAP_TRANSFER = 0x05,
ID_DAP_TRANSFER_BLOCK = 0x06,
ID_DAP_TRANSFER_ABORT = 0x07,
ID_DAP_WRITE_ABORT = 0x08,
ID_DAP_DELAY = 0x09,
ID_DAP_RESET_TARGET = 0x0a,
ID_DAP_SWJ_PINS = 0x10,
ID_DAP_SWJ_CLOCK = 0x11,
ID_DAP_SWJ_SEQUENCE = 0x12,
ID_DAP_SWD_CONFIGURE = 0x13,
ID_DAP_SWD_SEQUENCE = 0x1d,
ID_DAP_JTAG_SEQUENCE = 0x14,
ID_DAP_JTAG_CONFIGURE = 0x15,
ID_DAP_JTAG_IDCODE = 0x16,
ID_DAP_SWO_TRANSPORT = 0x17,
ID_DAP_SWO_MODE = 0x18,
ID_DAP_SWO_BAUDRATE = 0x19,
ID_DAP_SWO_CONTROL = 0x1a,
ID_DAP_SWO_STATUS = 0x1b,
ID_DAP_SWO_EXT_STATUS = 0x1e,
ID_DAP_SWO_DATA = 0x1c,
ID_DAP_QUEUE_COMMANDS = 0x7e,
ID_DAP_EXECUTE_COMMANDS = 0x7f,
ID_DAP_VENDOR_0 = 0x80,
ID_DAP_VENDOR_31 = 0x9f,
ID_DAP_VENDOR_EX_FIRS = 0xa0,
ID_DAP_VENDOR_EX_LAST = 0xfe,
ID_DAP_INVALID = 0xff,
};
enum
{
DAP_INFO_VENDOR = 0x01,
DAP_INFO_PRODUCT = 0x02,
DAP_INFO_SER_NUM = 0x03,
DAP_INFO_CMSIS_DAP_VER = 0x04,
DAP_INFO_DEVICE_VENDOR = 0x05,
DAP_INFO_DEVICE_NAME = 0x06,
DAP_INFO_BOARD_VENDOR = 0x07,
DAP_INFO_BOARD_NAME = 0x08,
DAP_INFO_FW_VER = 0x09,
DAP_INFO_CAPABILITIES = 0xf0,
DAP_INFO_TDT = 0xf1,
DAP_INFO_UART_RX_SIZE = 0xfb,
DAP_INFO_UART_TX_SIZE = 0xfc,
DAP_INFO_SWO_BUF_SIZE = 0xfd,
DAP_INFO_PACKET_COUNT = 0xfe,
DAP_INFO_PACKET_SIZE = 0xff,
};
enum
{
DAP_CAP_SWD = (1 << 0),
DAP_CAP_JTAG = (1 << 1),
DAP_CAP_SWO_UART = (1 << 2),
DAP_CAP_SWO_MANCHESTER = (1 << 3),
DAP_CAP_ATOMIC_CMD = (1 << 4),
DAP_CAP_TDT = (1 << 5),
DAP_CAP_SWO_STREAMING = (1 << 6),
DAP_CAP_UART_COM_PORT = (1 << 7),
};
enum
{
DAP_TRANSFER_APnDP = 1 << 0,
DAP_TRANSFER_RnW = 1 << 1,
DAP_TRANSFER_A2 = 1 << 2,
DAP_TRANSFER_A3 = 1 << 3,
DAP_TRANSFER_MATCH_VALUE = 1 << 4,
DAP_TRANSFER_MATCH_MASK = 1 << 5,
DAP_TRANSFER_JTAG_ABORT = 1 << 16,
};
enum
{
DAP_TRANSFER_INVALID = 0,
DAP_TRANSFER_OK = 1 << 0,
DAP_TRANSFER_WAIT = 1 << 1,
DAP_TRANSFER_FAULT = 1 << 2,
DAP_TRANSFER_ERROR = 1 << 3,
DAP_TRANSFER_MISMATCH = 1 << 4,
};
enum
{
DAP_PORT_DISABLED = 0,
DAP_PORT_AUTODETECT = 0,
DAP_PORT_SWD = 1,
DAP_PORT_JTAG = 2,
};
enum
{
DAP_SWJ_SWCLK_TCK = 1 << 0,
DAP_SWJ_SWDIO_TMS = 1 << 1,
DAP_SWJ_TDI = 1 << 2,
DAP_SWJ_TDO = 1 << 3,
DAP_SWJ_nTRST = 1 << 5,
DAP_SWJ_nRESET = 1 << 7,
};
enum
{
DAP_OK = 0x00,
DAP_ERROR = 0xff,
};
enum
{
SWD_DP_R_IDCODE = 0x00,
SWD_DP_W_ABORT = 0x00,
SWD_DP_R_RDBUFF = 0x0c,
};
enum
{
JTAG_ABORT = 0x08,
JTAG_DPACC = 0x0a,
JTAG_APACC = 0x0b,
JTAG_IDCODE = 0x0e,
JTAG_BYPASS = 0x0f,
JTAG_INVALID = 0xff,
};
enum
{
JTAG_SEQUENCE_COUNT = 0x3f,
JTAG_SEQUENCE_TMS = 0x40,
JTAG_SEQUENCE_TDO = 0x80,
};
enum
{
SWD_SEQUENCE_COUNT = 0x3f,
SWD_SEQUENCE_DIN = 0x80,
};
#define ARM_JTAG_IR_LENGTH 4
/*- Constants ---------------------------------------------------------------*/
static const struct
{
int id;
char * const str;
} dap_info_strings[] =
{
#ifdef DAP_CONFIG_VENDOR_STR
{ DAP_INFO_VENDOR, DAP_CONFIG_VENDOR_STR },
#endif
#ifdef DAP_CONFIG_PRODUCT_STR
{ DAP_INFO_PRODUCT, DAP_CONFIG_PRODUCT_STR },
#endif
#ifdef DAP_CONFIG_SER_NUM_STR
{ DAP_INFO_SER_NUM, DAP_CONFIG_SER_NUM_STR },
#endif
#ifdef DAP_CONFIG_CMSIS_DAP_VER_STR
{ DAP_INFO_CMSIS_DAP_VER, DAP_CONFIG_CMSIS_DAP_VER_STR },
#endif
#ifdef DAP_CONFIG_DEVICE_VENDOR_STR
{ DAP_INFO_DEVICE_VENDOR, DAP_CONFIG_DEVICE_VENDOR_STR },
#endif
#ifdef DAP_CONFIG_DEVICE_NAME_STR
{ DAP_INFO_DEVICE_NAME, DAP_CONFIG_DEVICE_NAME_STR },
#endif
#ifdef DAP_CONFIG_BOARD_VENDOR_STR
{ DAP_INFO_BOARD_VENDOR, DAP_CONFIG_BOARD_VENDOR_STR },
#endif
#ifdef DAP_CONFIG_BOARD_NAME_STR
{ DAP_INFO_BOARD_NAME, DAP_CONFIG_BOARD_NAME_STR },
#endif
#ifdef DAP_CONFIG_FW_VER_STR
{ DAP_INFO_FW_VER, DAP_CONFIG_FW_VER_STR },
#endif
};
/*- Variables ---------------------------------------------------------------*/
static int dap_port;
static volatile bool dap_abort;
static uint32_t dap_match_mask;
static int dap_idle_cycles;
static int dap_retry_count;
static int dap_match_retry_count;
static int dap_clock_delay;
static void (*dap_swj_run)(int);
static void (*dap_swd_write)(uint32_t, int);
static uint32_t (*dap_swd_read)(int);
#ifdef DAP_CONFIG_ENABLE_JTAG
static uint32_t (*dap_jtag_write)(uint32_t, int);
static uint32_t (*dap_jtag_read)(int);
static uint32_t (*dap_jtag_rdwr)(uint32_t, int);
#endif
static uint8_t *dap_req_buf;
static int dap_req_size;
static int dap_req_ptr;
static uint8_t *dap_resp_buf;
static int dap_resp_size;
static int dap_resp_ptr;
static bool dap_buf_error;
static int dap_swd_turnaround;
static bool dap_swd_data_phase;
#ifdef DAP_CONFIG_ENABLE_JTAG
static int dap_jtag_dev_count;
static int dap_jtag_dev_index;
static int dap_jtag_ir_length[DAP_CONFIG_JTAG_DEV_COUNT];
static int dap_jtag_ir_before[DAP_CONFIG_JTAG_DEV_COUNT];
static int dap_jtag_ir_after[DAP_CONFIG_JTAG_DEV_COUNT];
static int dap_jtag_ir;
#endif
/*- Implementations ---------------------------------------------------------*/
//-----------------------------------------------------------------------------
static void dap_delay_us(int delay)
{
while (delay)
{
int del = (delay > 100000) ? 100000 : delay;
DAP_CONFIG_DELAY((DAP_CONFIG_DELAY_CONSTANT * 2 * del) / 1000);
delay -= del;
}
}
//-----------------------------------------------------------------------------
#define DAP_SWJ_FN(ver, delay) \
DAP_CONFIG_PERFORMANCE_ATTR \
static void dap_swj_run_##ver(int cycles) \
{ \
while (cycles--) \
{ \
DAP_CONFIG_SWCLK_TCK_clr(); \
delay(dap_clock_delay); \
DAP_CONFIG_SWCLK_TCK_set(); \
delay(dap_clock_delay); \
} \
}
DAP_SWJ_FN(slow, DAP_CONFIG_DELAY)
DAP_SWJ_FN(fast, (void))
//-----------------------------------------------------------------------------
#define DAP_SWD_FN(ver, delay) \
DAP_CONFIG_PERFORMANCE_ATTR \
static void dap_swd_write_##ver(uint32_t value, int size) \
{ \
for (int i = 0; i < size; i++) \
{ \
DAP_CONFIG_SWDIO_TMS_write(value & 1); \
DAP_CONFIG_SWCLK_TCK_clr(); \
delay(dap_clock_delay); \
DAP_CONFIG_SWCLK_TCK_set(); \
delay(dap_clock_delay); \
value >>= 1; \
} \
} \
\
DAP_CONFIG_PERFORMANCE_ATTR \
static uint32_t dap_swd_read_##ver(int size) \
{ \
uint32_t value = 0; \
uint32_t bit; \
for (int i = 0; i < size; i++) \
{ \
DAP_CONFIG_SWCLK_TCK_clr(); \
delay(dap_clock_delay); \
bit = DAP_CONFIG_SWDIO_TMS_read(); \
DAP_CONFIG_SWCLK_TCK_set(); \
delay(dap_clock_delay); \
value |= (bit << i); \
} \
return value; \
}
DAP_SWD_FN(slow, DAP_CONFIG_DELAY)
DAP_SWD_FN(fast, (void))
//-----------------------------------------------------------------------------
static inline uint32_t dap_parity(uint32_t value)
{
value ^= value >> 16;
value ^= value >> 8;
value ^= value >> 4;
value &= 0x0f;
return (0x6996 >> value) & 1;
}
//-----------------------------------------------------------------------------
static int dap_swd_operation(int req, uint32_t *data)
{
uint32_t value;
int ack = 0;
req &= (DAP_TRANSFER_APnDP | DAP_TRANSFER_RnW | DAP_TRANSFER_A2 | DAP_TRANSFER_A3);
dap_swd_write(0x81 | (dap_parity(req) << 5) | (req << 1), 8);
DAP_CONFIG_SWDIO_TMS_in();
dap_swj_run(dap_swd_turnaround);
ack = dap_swd_read(3);
if (DAP_TRANSFER_OK == ack)
{
if (req & DAP_TRANSFER_RnW)
{
value = dap_swd_read(32);
if (dap_parity(value) != dap_swd_read(1))
ack = DAP_TRANSFER_ERROR;
if (data)
*data = value;
dap_swj_run(dap_swd_turnaround);
DAP_CONFIG_SWDIO_TMS_out();
}
else
{
dap_swj_run(dap_swd_turnaround);
DAP_CONFIG_SWDIO_TMS_out();
dap_swd_write(*data, 32);
dap_swd_write(dap_parity(*data), 1);
}
DAP_CONFIG_SWDIO_TMS_write(0);
dap_swj_run(dap_idle_cycles);
}
else if (DAP_TRANSFER_WAIT == ack || DAP_TRANSFER_FAULT == ack)
{
if (dap_swd_data_phase && (req & DAP_TRANSFER_RnW))
dap_swj_run(32 + 1);
dap_swj_run(dap_swd_turnaround);
DAP_CONFIG_SWDIO_TMS_out();
if (dap_swd_data_phase && (0 == (req & DAP_TRANSFER_RnW)))
{
DAP_CONFIG_SWDIO_TMS_write(0);
dap_swj_run(32 + 1);
}
}
else
{
dap_swj_run(dap_swd_turnaround + 32 + 1);
}
DAP_CONFIG_SWDIO_TMS_write(1);
return ack;
}
#ifdef DAP_CONFIG_ENABLE_JTAG
//-----------------------------------------------------------------------------
#define DAP_JTAG_FN(ver, delay) \
DAP_CONFIG_PERFORMANCE_ATTR \
static uint32_t dap_jtag_write_##ver(uint32_t value, int size) \
{ \
for (int i = 0; i < size; i++) \
{ \
DAP_CONFIG_TDI_write(value & 1); \
DAP_CONFIG_SWCLK_TCK_clr(); \
delay(dap_clock_delay); \
DAP_CONFIG_SWCLK_TCK_set(); \
delay(dap_clock_delay); \
value >>= 1; \
} \
return value; \
} \
\
DAP_CONFIG_PERFORMANCE_ATTR \
static uint32_t dap_jtag_read_##ver(int size) \
{ \
uint32_t value = 0; \
uint32_t bit; \
for (int i = 0; i < size; i++) \
{ \
DAP_CONFIG_SWCLK_TCK_clr(); \
delay(dap_clock_delay); \
bit = DAP_CONFIG_TDO_read(); \
DAP_CONFIG_SWCLK_TCK_set(); \
delay(dap_clock_delay); \
value |= (bit << i); \
} \
return value; \
} \
\
DAP_CONFIG_PERFORMANCE_ATTR \
static uint32_t dap_jtag_rdwr_##ver(uint32_t value, int size) \
{ \
uint32_t rvalue = 0; \
uint32_t bit; \
for (int i = 0; i < size; i++) \
{ \
DAP_CONFIG_TDI_write(value & 1); \
DAP_CONFIG_SWCLK_TCK_clr(); \
delay(dap_clock_delay); \
bit = DAP_CONFIG_TDO_read(); \
DAP_CONFIG_SWCLK_TCK_set(); \
delay(dap_clock_delay); \
value >>= 1; \
rvalue |= (bit << i); \
} \
return rvalue; \
}
DAP_JTAG_FN(slow, DAP_CONFIG_DELAY)
DAP_JTAG_FN(fast, (void))
//-----------------------------------------------------------------------------
static void dap_jtag_write_ir(int ir)
{
int len = dap_jtag_ir_length[dap_jtag_dev_index];
DAP_CONFIG_SWDIO_TMS_write(1);
dap_swj_run(2); // -> Select-IR-Scan
DAP_CONFIG_SWDIO_TMS_write(0);
dap_swj_run(2); // -> Shift-IR
DAP_CONFIG_TDI_write(1);
dap_swj_run(dap_jtag_ir_before[dap_jtag_dev_index]);
ir = dap_jtag_write(ir, len-1);
if (dap_jtag_ir_after[dap_jtag_dev_index])
{
dap_jtag_write(ir, 1);
DAP_CONFIG_TDI_write(1);
dap_swj_run(dap_jtag_ir_after[dap_jtag_dev_index]-1);
DAP_CONFIG_SWDIO_TMS_write(1);
dap_swj_run(1); // -> Exit1-IR
}
else
{
DAP_CONFIG_SWDIO_TMS_write(1);
dap_jtag_write(ir, 1); // -> Exit1-IR
}
dap_swj_run(1); // -> Update-IR
DAP_CONFIG_SWDIO_TMS_write(0);
dap_swj_run(1); // -> Idle
DAP_CONFIG_TDI_write(1);
}
//-----------------------------------------------------------------------------
static int dap_jtag_operation(int req, uint32_t *data)
{
int ack, ir;
if (DAP_TRANSFER_JTAG_ABORT == req)
ir = JTAG_ABORT;
else
ir = (req & DAP_TRANSFER_APnDP) ? JTAG_APACC : JTAG_DPACC;
if (ir != dap_jtag_ir)
{
dap_jtag_ir = ir;
dap_jtag_write_ir(ir);
}
DAP_CONFIG_SWDIO_TMS_write(1);
dap_swj_run(1); // -> Select-DR-Scan
DAP_CONFIG_SWDIO_TMS_write(0);
dap_swj_run(2 + dap_jtag_dev_index); // -> Shift-DR
ack = dap_jtag_rdwr(req >> 1, 3);
if (ack == 0x2)
ack = DAP_TRANSFER_OK; // or FAULT
else if (ack == 0x1)
ack = DAP_TRANSFER_WAIT;
else
ack = DAP_TRANSFER_INVALID;
if (DAP_TRANSFER_OK == ack)
{
int cnt = dap_jtag_dev_count - dap_jtag_dev_index - 1;
uint32_t value;
if (req & DAP_TRANSFER_RnW)
{
if (cnt)
{
value = dap_jtag_read(32);
dap_swj_run(cnt-1);
DAP_CONFIG_SWDIO_TMS_write(1);
dap_swj_run(1); // -> Exit1-DR
}
else
{
value = dap_jtag_read(31);
DAP_CONFIG_SWDIO_TMS_write(1);
value |= (dap_jtag_read(1) << 31); // -> Exit1-DR
}
if (data)
*data = value;
}
else
{
value = *data;
if (cnt)
{
dap_jtag_write(value, 32);
dap_swj_run(cnt-1);
DAP_CONFIG_SWDIO_TMS_write(1);
dap_swj_run(1); // -> Exit1-DR
}
else
{
value = dap_jtag_write(value, 31);
DAP_CONFIG_SWDIO_TMS_write(1);
dap_jtag_write(value, 1); // -> Exit1-DR
}
}
}
else // Not OK
{
DAP_CONFIG_SWDIO_TMS_write(1);
dap_swj_run(1); // -> Exit1-DR
}
dap_swj_run(1); // -> Update-DR
DAP_CONFIG_SWDIO_TMS_write(0);
dap_swj_run(1); // -> Idle
DAP_CONFIG_TDI_write(1);
dap_swj_run(dap_idle_cycles);
return ack;
}
#endif // DAP_CONFIG_ENABLE_JTAG
//-----------------------------------------------------------------------------
static void dap_setup_clock(int freq)
{
if (freq > DAP_CONFIG_FAST_CLOCK)
{
dap_clock_delay = 0;
dap_swj_run = dap_swj_run_fast;
dap_swd_write = dap_swd_write_fast;
dap_swd_read = dap_swd_read_fast;
#ifdef DAP_CONFIG_ENABLE_JTAG
dap_jtag_write = dap_jtag_write_fast;
dap_jtag_read = dap_jtag_read_fast;
dap_jtag_rdwr = dap_jtag_rdwr_fast;
#endif
}
else
{
dap_clock_delay = (DAP_CONFIG_DELAY_CONSTANT * 1000) / freq;
dap_swj_run = dap_swj_run_slow;
dap_swd_write = dap_swd_write_slow;
dap_swd_read = dap_swd_read_slow;
#ifdef DAP_CONFIG_ENABLE_JTAG
dap_jtag_write = dap_jtag_write_slow;
dap_jtag_read = dap_jtag_read_slow;
dap_jtag_rdwr = dap_jtag_rdwr_slow;
#endif
}
}
//-----------------------------------------------------------------------------
static bool dap_select_device(int index)
{
if (DAP_PORT_SWD == dap_port)
return true;
#ifdef DAP_CONFIG_ENABLE_JTAG
if (DAP_PORT_JTAG == dap_port)
{
if (index >= dap_jtag_dev_count || dap_jtag_ir_length[index] != ARM_JTAG_IR_LENGTH)
return false;
dap_jtag_dev_index = index;
return true;
}
#endif
(void)index;
return false;
}
//-----------------------------------------------------------------------------
static int dap_transfer_word(int req, uint32_t *data)
{
int ack = DAP_TRANSFER_INVALID;
for (int i = 0; i < dap_retry_count; i++)
{
if (DAP_PORT_SWD == dap_port)
ack = dap_swd_operation(req, data);
#ifdef DAP_CONFIG_ENABLE_JTAG
else if (DAP_PORT_JTAG == dap_port)
ack = dap_jtag_operation(req, data);
#endif
if (DAP_TRANSFER_WAIT != ack || dap_abort)
break;
}
return ack;
}
//-----------------------------------------------------------------------------
static bool dap_needs_posted_read(int request)
{
if (0 == (request & DAP_TRANSFER_RnW))
return false;
if (DAP_PORT_SWD == dap_port)
return (request & DAP_TRANSFER_APnDP);
#ifdef DAP_CONFIG_ENABLE_JTAG
if (DAP_PORT_JTAG == dap_port)
return true;
#endif
return false;
}
//-----------------------------------------------------------------------------
static void dap_buf_init(uint8_t *req, int req_size, uint8_t *resp, int resp_size)
{
dap_req_buf = req;
dap_req_size = req_size;
dap_req_ptr = 0;
dap_resp_buf = resp;
dap_resp_size = resp_size;
dap_resp_ptr = 0;
dap_buf_error = false;
}
//-----------------------------------------------------------------------------
uint8_t dap_req_get_byte(void)
{
if (dap_buf_error || ((dap_req_size - dap_req_ptr) < (int)sizeof(uint8_t)))
{
dap_buf_error = true;
return 0;
}
return dap_req_buf[dap_req_ptr++];
}
//-----------------------------------------------------------------------------
uint16_t dap_req_get_half(void)
{
if (dap_buf_error || ((dap_req_size - dap_req_ptr) < (int)sizeof(uint16_t)))
{
dap_buf_error = true;
return 0;
}
uint16_t value =
((uint16_t)dap_req_buf[dap_req_ptr + 1] << 8) |
(uint16_t)dap_req_buf[dap_req_ptr];
dap_req_ptr += sizeof(uint16_t);
return value;
}
//-----------------------------------------------------------------------------
uint32_t dap_req_get_word(void)
{
if (dap_buf_error || ((dap_req_size - dap_req_ptr) < (int)sizeof(uint32_t)))
{
dap_buf_error = true;
return 0;
}
uint32_t value =
((uint32_t)dap_req_buf[dap_req_ptr + 3] << 24) |
((uint32_t)dap_req_buf[dap_req_ptr + 2] << 16) |
((uint32_t)dap_req_buf[dap_req_ptr + 1] << 8) |
(uint32_t)dap_req_buf[dap_req_ptr];
dap_req_ptr += sizeof(uint32_t);
return value;
}
//-----------------------------------------------------------------------------
void dap_resp_add_byte(uint8_t value)
{
if (dap_buf_error || ((dap_resp_size - dap_resp_ptr) < (int)sizeof(uint8_t)))
{
dap_buf_error = true;
return;
}
dap_resp_buf[dap_resp_ptr++] = value;
}
//-----------------------------------------------------------------------------
void dap_resp_add_word(uint32_t value)
{
if (dap_buf_error || ((dap_resp_size - dap_resp_ptr) < (int)sizeof(uint32_t)))
{
dap_buf_error = true;
return;
}
dap_resp_buf[dap_resp_ptr + 0] = value;
dap_resp_buf[dap_resp_ptr + 1] = value >> 8;
dap_resp_buf[dap_resp_ptr + 2] = value >> 16;
dap_resp_buf[dap_resp_ptr + 3] = value >> 24;
dap_resp_ptr += sizeof(uint32_t);
}
//-----------------------------------------------------------------------------
void dap_resp_set_byte(int index, uint8_t value)
{
if (index < dap_resp_ptr)
dap_resp_buf[index] = value;
}
//-----------------------------------------------------------------------------
bool dap_is_buf_error(void)
{
return dap_buf_error;
}
//-----------------------------------------------------------------------------
static void dap_info(void)
{
int index = dap_req_get_byte();
if (DAP_INFO_CAPABILITIES == index)
{
int cap = DAP_CAP_SWD;
#ifdef DAP_CONFIG_ENABLE_JTAG
cap |= DAP_CAP_JTAG;
#endif
dap_resp_add_byte(1);
dap_resp_add_byte(cap);
}
else if (DAP_INFO_PACKET_COUNT == index)
{
dap_resp_add_byte(1);
dap_resp_add_byte(DAP_CONFIG_PACKET_COUNT);
}
else if (DAP_INFO_PACKET_SIZE == index)
{
dap_resp_add_byte(2);
dap_resp_add_byte(DAP_CONFIG_PACKET_SIZE & 0xff);
dap_resp_add_byte((DAP_CONFIG_PACKET_SIZE >> 8) & 0xff);
}
else
{
dap_resp_add_byte(0); // Size placeholder
for (int i = 0; i < ARRAY_SIZE(dap_info_strings); i++)
{
if (dap_info_strings[i].id == index)
{
const char *str = dap_info_strings[i].str;
while (*str)
dap_resp_add_byte(*str++);
dap_resp_add_byte(0);
dap_resp_set_byte(1, dap_resp_ptr-2);
break;
}
}
}
}
//-----------------------------------------------------------------------------
static void dap_host_status(void)
{
int index = dap_req_get_byte();
int state = dap_req_get_byte();
DAP_CONFIG_LED(index, state);
dap_resp_add_byte(DAP_OK);
}
//-----------------------------------------------------------------------------
static void dap_connect(void)
{
int port = dap_req_get_byte();
if (DAP_PORT_AUTODETECT == port)
port = DAP_CONFIG_DEFAULT_PORT;
dap_port = DAP_PORT_DISABLED;
if (DAP_PORT_SWD == port)
{
DAP_CONFIG_CONNECT_SWD();
dap_port = DAP_PORT_SWD;
}
#ifdef DAP_CONFIG_ENABLE_JTAG
else if (DAP_PORT_JTAG == port)
{
DAP_CONFIG_CONNECT_JTAG();
dap_port = DAP_PORT_JTAG;
}
#endif
dap_resp_add_byte(dap_port);
}
//-----------------------------------------------------------------------------
static void dap_disconnect(void)
{
DAP_CONFIG_DISCONNECT();
dap_port = DAP_PORT_DISABLED;
dap_resp_add_byte(DAP_OK);
}
//-----------------------------------------------------------------------------
static void dap_transfer_configure(void)
{
dap_idle_cycles = dap_req_get_byte();
dap_retry_count = dap_req_get_half();
dap_match_retry_count = dap_req_get_half();
dap_resp_add_byte(DAP_OK);
}
//-----------------------------------------------------------------------------
static void dap_transfer(void)
{
int req_count, resp_count, request, ack;
bool posted_read, verify_write;
uint32_t data, match_value;
dap_resp_add_byte(0); // Count
dap_resp_add_byte(DAP_TRANSFER_INVALID);
if (!dap_select_device(dap_req_get_byte()))
return;
req_count = dap_req_get_byte();
resp_count = 0;
posted_read = false;
verify_write = false;
ack = DAP_TRANSFER_INVALID;
for (; req_count && !dap_abort && !dap_buf_error; req_count--, resp_count++)
{
request = dap_req_get_byte();
verify_write = false;
if (posted_read)
{
if (dap_needs_posted_read(request))
{
ack = dap_transfer_word(request, &data);
}
else
{
ack = dap_transfer_word(SWD_DP_R_RDBUFF | DAP_TRANSFER_RnW, &data);
posted_read = false;
}
if (ack != DAP_TRANSFER_OK)
break;
dap_resp_add_word(data);
if (posted_read)
continue;
}
if (request & DAP_TRANSFER_RnW)
{
if (request & DAP_TRANSFER_MATCH_VALUE)
{
match_value = dap_req_get_word();
if (dap_needs_posted_read(request))
dap_transfer_word(request, NULL);
for (int i = 0; i < dap_match_retry_count; i++)
{
ack = dap_transfer_word(request, &data);
if (DAP_TRANSFER_OK != ack || (data & dap_match_mask) == match_value || dap_abort)
break;
};
if ((data & dap_match_mask) != match_value)
ack |= DAP_TRANSFER_MISMATCH;
if (ack != DAP_TRANSFER_OK)
break;
}
else if (dap_needs_posted_read(request))
{
ack = dap_transfer_word(request, NULL);
if (ack != DAP_TRANSFER_OK)
break;
posted_read = true;
}
else
{
ack = dap_transfer_word(request, &data);
if (DAP_TRANSFER_OK != ack)
break;
dap_resp_add_word(data);
}
}
else // Write
{
data = dap_req_get_word();
if (request & DAP_TRANSFER_MATCH_MASK)
{
ack = DAP_TRANSFER_OK;
dap_match_mask = data;
}
else
{
ack = dap_transfer_word(request, &data);
if (ack != DAP_TRANSFER_OK)