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openFPGALoader
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precompute TMS sequencies

This commit is contained in:
Alexey Starikovskiy 2023-09-07 15:20:08 +03:00 committed by Gwenhael Goavec-Merou
parent 0bbf817c92
commit cceac16fc5
2 changed files with 115 additions and 279 deletions
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376
src/jtag.cpp
View File

@ -79,8 +79,7 @@ Jtag::Jtag(const cable_t &cable, const jtag_pins_conf_t *pin_conf,
const string &ip_adr, int port,
const bool invert_read_edge, const string &firmware_path):
_verbose(verbose > 1),
_state(RUN_TEST_IDLE),
_tms_buffer_size(128), _num_tms(0),
_state(UNKNOWN),
_board_name("nope"), device_index(0)
{
switch (cable.type) {
@ -146,20 +145,111 @@ Jtag::Jtag(const cable_t &cable, const jtag_pins_conf_t *pin_conf,
std::cerr << "Jtag: unknown cable type" << std::endl;
throw std::exception();
}
_tms_buffer = (unsigned char *)malloc(sizeof(unsigned char) * _tms_buffer_size);
if (_tms_buffer == nullptr)
throw std::runtime_error("Error: memory allocation failed");
memset(_tms_buffer, 0, _tms_buffer_size);
create_paths();
detectChain(32);
}
Jtag::~Jtag()
{
free(_tms_buffer);
delete _jtag;
}
constexpr static Jtag::tapState_t edges[16][2] = {
{Jtag::RUN_TEST_IDLE, Jtag::TEST_LOGIC_RESET}, // TEST_LOGIC_RESET
{Jtag::RUN_TEST_IDLE, Jtag::SELECT_DR_SCAN}, // RUN_TEST_IDLE
{Jtag::CAPTURE_DR, Jtag::SELECT_IR_SCAN}, // SELECT_DR_SCAN
{Jtag::SHIFT_DR, Jtag::EXIT1_DR}, // CAPTURE_DR
{Jtag::SHIFT_DR, Jtag::EXIT1_DR}, // SHIFT_DR
{Jtag::PAUSE_DR, Jtag::UPDATE_DR}, // EXIT1_DR
{Jtag::PAUSE_DR, Jtag::EXIT2_DR}, // PAUSE_DR
{Jtag::SHIFT_DR, Jtag::UPDATE_DR}, // EXIT2_DR
{Jtag::RUN_TEST_IDLE, Jtag::SELECT_DR_SCAN}, // UPDATE_DR
{Jtag::CAPTURE_IR, Jtag::TEST_LOGIC_RESET}, // SELECT_IR_SCAN
{Jtag::SHIFT_IR, Jtag::EXIT1_IR}, // CAPTURE_IR
{Jtag::SHIFT_IR, Jtag::EXIT1_IR}, // SHIFT_IR
{Jtag::PAUSE_IR, Jtag::UPDATE_IR}, // EXIT1_IR
{Jtag::PAUSE_IR, Jtag::EXIT2_IR}, // PAUSE_IR
{Jtag::SHIFT_IR, Jtag::UPDATE_IR}, // EXIT2_IR
{Jtag::RUN_TEST_IDLE, Jtag::SELECT_DR_SCAN}, // UPDATE_IR, same as UPDATE_DR
};
void Jtag::dive(unsigned origin, unsigned prev, const Path &p) {
for (unsigned i = 0; i < 2; ++i) {
unsigned x = edges[prev][i];
if (paths[origin][x].len <= p.len) continue;
Path pn;
pn.len = p.len + 1;
pn.tms_bits = p.tms_bits | i << p.len;
paths[origin][x] = pn;
dive(origin, x, pn);
}
}
constexpr static const char *getStateName[16] = {
"TEST_LOGIC_RESET",
"RUN_TEST_IDLE",
"SELECT_DR_SCAN",
"CAPTURE_DR",
"SHIFT_DR",
"EXIT1_DR",
"PAUSE_DR",
"EXIT2_DR",
"UPDATE_DR",
"SELECT_IR_SCAN",
"CAPTURE_IR",
"SHIFT_IR",
"EXIT1_IR",
"PAUSE_IR",
"EXIT2_IR",
"UPDATE_IR",
};
void Jtag::print_path(tapState_t from, tapState_t to) {
uint8_t path = paths[from][to].tms_bits;
printf ("Start: %s[%d]\n", getStateName[from], from);
tapState_t x = from;
for (unsigned i = 0; i < paths[from][to].len; ++i) {
unsigned step = path & 1;
path >>= 1;
x = edges[x][step];
printf("\t%d:TMS=%d: -> %s[%d]\n", i + 1, step, getStateName[x], x);
}
printf("Should arrive at %s[%d]\n", getStateName[x], x);
}
void Jtag::create_paths() {
uint8_t max_len = 0;
for (unsigned i = 0; i < 16; ++i) {
for (unsigned j = 0; j < 16; ++j) {
paths[i][j].len = 0xff;
paths[i][j].tms_bits = 0;
}
Path p = {0, 0};
paths[i][i] = p;
dive(i, i, p);
for (unsigned j = 0; j < 16; ++j) {
max_len = std::max(max_len, paths[i][j].len);
}
}
#if 0
printf("max tms sequence is %d\n", max_len);
print_path(TEST_LOGIC_RESET, RUN_TEST_IDLE);
print_path(RUN_TEST_IDLE, SHIFT_IR);
print_path(RUN_TEST_IDLE, SHIFT_DR);
print_path(SHIFT_IR, RUN_TEST_IDLE);
print_path(SHIFT_DR, PAUSE_DR);
print_path(PAUSE_DR, SHIFT_DR);
print_path(SHIFT_IR, PAUSE_IR);
print_path(PAUSE_IR, SHIFT_DR);
print_path(PAUSE_IR, RUN_TEST_IDLE);
#endif
}
int Jtag::detectChain(unsigned max_dev)
{
char message[256];
@ -231,7 +321,6 @@ int Jtag::detectChain(unsigned max_dev)
}
}
set_state(TEST_LOGIC_RESET);
flushTMS(true);
return _devices_list.size();
}
@ -295,53 +384,17 @@ int Jtag::device_select(unsigned index)
return device_index;
}
void Jtag::setTMS(unsigned char tms)
{
display("%s %x %d %d\n", __func__, tms, _num_tms, (_num_tms >> 3));
if (_num_tms+1 == _tms_buffer_size * 8)
flushTMS(false);
if (tms != 0)
_tms_buffer[_num_tms>>3] |= (0x1) << (_num_tms & 0x7);
_num_tms++;
}
/* reconstruct byte sent to TMS pins
* - use up to 6 bits
* -since next bit after length is use to
* fix TMS state after sent we copy last bit
* to bit after next
* -bit 7 is TDI state for each clk cycles
*/
int Jtag::flushTMS(bool flush_buffer)
{
int ret = 0;
if (_num_tms != 0) {
display("%s: %d %x\n", __func__, _num_tms, _tms_buffer[0]);
ret = _jtag->writeTMS(_tms_buffer, _num_tms, flush_buffer);
/* reset buffer and number of bits */
memset(_tms_buffer, 0, _tms_buffer_size);
_num_tms = 0;
} else if (flush_buffer) {
_jtag->flush();
}
return ret;
}
void Jtag::go_test_logic_reset()
{
/* independently to current state 5 clk with TMS high is enough */
for (int i = 0; i < 6; i++)
setTMS(0x01);
flushTMS(false);
uint8_t bits = 0xff;
_jtag->writeTMS(&bits, 5, false);
_state = TEST_LOGIC_RESET;
}
int Jtag::read_write(const uint8_t *tdi, unsigned char *tdo, int len, char last)
{
flushTMS(false);
_jtag->writeTDI(tdi, tdo, len, last);
if (last == 1)
_state = (_state == SHIFT_DR) ? EXIT1_DR : EXIT1_IR;
@ -350,8 +403,7 @@ int Jtag::read_write(const uint8_t *tdi, unsigned char *tdo, int len, char last)
void Jtag::toggleClk(int nb)
{
unsigned char c = (TEST_LOGIC_RESET == _state) ? 1 : 0;
flushTMS(false);
uint8_t c = (TEST_LOGIC_RESET == _state) ? 1 : 0;
if (_jtag->toggleClk(c, 0, nb) >= 0)
return;
throw std::exception();
@ -365,7 +417,6 @@ int Jtag::shiftDR(const uint8_t *tdi, unsigned char *tdo, int drlen, tapState_t
*/
if (_state != SHIFT_DR) {
set_state(SHIFT_DR);
flushTMS(false); // force transmit tms state
if (_dr_bits_before)
read_write(_dr_bits.data(), NULL, _dr_bits_before, false);
@ -435,226 +486,9 @@ int Jtag::shiftIR(unsigned char *tdi, unsigned char *tdo, int irlen, tapState_t
void Jtag::set_state(tapState_t newState)
{
unsigned char tms = 0;
while (newState != _state) {
display("_state : %16s(%02d) -> %s(%02d) ",
getStateName((tapState_t)_state),
_state,
getStateName((tapState_t)newState), newState);
switch (_state) {
case TEST_LOGIC_RESET:
if (newState == TEST_LOGIC_RESET) {
tms = 1;
} else {
tms = 0;
_state = RUN_TEST_IDLE;
}
break;
case RUN_TEST_IDLE:
if (newState == RUN_TEST_IDLE) {
tms = 0;
} else {
tms = 1;
_state = SELECT_DR_SCAN;
}
break;
case SELECT_DR_SCAN:
switch (newState) {
case CAPTURE_DR:
case SHIFT_DR:
case EXIT1_DR:
case PAUSE_DR:
case EXIT2_DR:
case UPDATE_DR:
tms = 0;
_state = CAPTURE_DR;
break;
default:
tms = 1;
_state = SELECT_IR_SCAN;
}
break;
case SELECT_IR_SCAN:
switch (newState) {
case CAPTURE_IR:
case SHIFT_IR:
case EXIT1_IR:
case PAUSE_IR:
case EXIT2_IR:
case UPDATE_IR:
tms = 0;
_state = CAPTURE_IR;
break;
default:
tms = 1;
_state = TEST_LOGIC_RESET;
}
break;
/* DR column */
case CAPTURE_DR:
if (newState == SHIFT_DR) {
tms = 0;
_state = SHIFT_DR;
} else {
tms = 1;
_state = EXIT1_DR;
}
break;
case SHIFT_DR:
if (newState == SHIFT_DR) {
tms = 0;
} else {
tms = 1;
_state = EXIT1_DR;
}
break;
case EXIT1_DR:
switch (newState) {
case PAUSE_DR:
case EXIT2_DR:
case SHIFT_DR:
case EXIT1_DR:
tms = 0;
_state = PAUSE_DR;
break;
default:
tms = 1;
_state = UPDATE_DR;
}
break;
case PAUSE_DR:
if (newState == PAUSE_DR) {
tms = 0;
} else {
tms = 1;
_state = EXIT2_DR;
}
break;
case EXIT2_DR:
switch (newState) {
case SHIFT_DR:
case EXIT1_DR:
case PAUSE_DR:
tms = 0;
_state = SHIFT_DR;
break;
default:
tms = 1;
_state = UPDATE_DR;
}
break;
case UPDATE_DR:
case UPDATE_IR:
if (newState == RUN_TEST_IDLE) {
tms = 0;
_state = RUN_TEST_IDLE;
} else {
tms = 1;
_state = SELECT_DR_SCAN;
}
break;
/* IR column */
case CAPTURE_IR:
if (newState == SHIFT_IR) {
tms = 0;
_state = SHIFT_IR;
} else {
tms = 1;
_state = EXIT1_IR;
}
break;
case SHIFT_IR:
if (newState == SHIFT_IR) {
tms = 0;
} else {
tms = 1;
_state = EXIT1_IR;
}
break;
case EXIT1_IR:
switch (newState) {
case PAUSE_IR:
case EXIT2_IR:
case SHIFT_IR:
case EXIT1_IR:
tms = 0;
_state = PAUSE_IR;
break;
default:
tms = 1;
_state = UPDATE_IR;
}
break;
case PAUSE_IR:
if (newState == PAUSE_IR) {
tms = 0;
} else {
tms = 1;
_state = EXIT2_IR;
}
break;
case EXIT2_IR:
switch (newState) {
case SHIFT_IR:
case EXIT1_IR:
case PAUSE_IR:
tms = 0;
_state = SHIFT_IR;
break;
default:
tms = 1;
_state = UPDATE_IR;
}
break;
case UNKNOWN:;
// UNKNOWN should not be valid...
throw std::exception();
}
setTMS(tms);
display("%d %d %d %x\n", tms, _num_tms-1, _state,
_tms_buffer[(_num_tms-1) / 8]);
}
/* force write buffer */
flushTMS(false);
}
const char *Jtag::getStateName(tapState_t s)
{
switch (s) {
case TEST_LOGIC_RESET:
return "TEST_LOGIC_RESET";
case RUN_TEST_IDLE:
return "RUN_TEST_IDLE";
case SELECT_DR_SCAN:
return "SELECT_DR_SCAN";
case CAPTURE_DR:
return "CAPTURE_DR";
case SHIFT_DR:
return "SHIFT_DR";
case EXIT1_DR:
return "EXIT1_DR";
case PAUSE_DR:
return "PAUSE_DR";
case EXIT2_DR:
return "EXIT2_DR";
case UPDATE_DR:
return "UPDATE_DR";
case SELECT_IR_SCAN:
return "SELECT_IR_SCAN";
case CAPTURE_IR:
return "CAPTURE_IR";
case SHIFT_IR:
return "SHIFT_IR";
case EXIT1_IR:
return "EXIT1_IR";
case PAUSE_IR:
return "PAUSE_IR";
case EXIT2_IR:
return "EXIT2_IR";
case UPDATE_IR:
return "UPDATE_IR";
default:
return "Unknown";
if (_state >= UNKNOWN || newState >= UNKNOWN) {
throw std::exception();
}
_jtag->writeTMS(&paths[_state][newState].tms_bits, paths[_state][newState].len, false);
_state = newState;
}

18
src/jtag.hpp
View File

@ -99,11 +99,7 @@ class Jtag {
void toggleClk(int nb);
void go_test_logic_reset();
void set_state(tapState_t newState);
int flushTMS(bool flush_buffer = false);
void flush() {flushTMS(); _jtag->flush();}
void setTMS(unsigned char tms);
const char *getStateName(tapState_t s);
void flush() {_jtag->flush();}
/* utilities */
void setVerbose(int8_t verbose){_verbose = verbose;}
@ -121,9 +117,6 @@ class Jtag {
bool search_and_insert_device_with_idcode(uint32_t idcode);
bool _verbose;
tapState_t _state;
int _tms_buffer_size;
int _num_tms;
unsigned char *_tms_buffer;
std::string _board_name;
int device_index; /*!< index for targeted FPGA */
@ -139,5 +132,14 @@ class Jtag {
std::vector<int32_t> _devices_list; /*!< ordered list of devices idcode */
std::vector<int16_t> _irlength_list; /*!< ordered list of irlength */
struct Path {
uint8_t tms_bits;
uint8_t len;
} paths[16][16];
void dive(unsigned origin, unsigned prev, const Path &p);
void print_path(tapState_t from, tapState_t to);
void create_paths();
};
#endif