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// https://github.com/pulp-platform/riscv-dbg/blob/master/tb/remote_bitbang/remote_bitbang.h
// See LICENSE.Berkeley for license details.
#ifndef REMOTE_JTAG_HPP
#define REMOTE_JTAG_HPP
#include <atomic>
#include <cstdint>
#include <condition_variable>
#include <mutex>
#include <thread>
class remote_jtag
{
public:
remote_jtag(std::uint16_t port);
~remote_jtag();
inline bool pending() noexcept
{
return this->readable.load(std::memory_order_relaxed);
}
inline bool alive() noexcept
{
return !this->dead.load(std::memory_order_relaxed);
}
template<typename F>
void process
(
unsigned char *tck,
unsigned char *tms,
unsigned char *tdi,
unsigned char *trstn,
unsigned char *tdo,
F &&cycle
);
private:
int socket_fd = -1;
std::atomic<bool> readable = false;
std::atomic<bool> dead = false;
char in_buffer[512];
char out_buffer[512];
ssize_t read_bytes = 0;
unsigned write_bytes = 0;
std::mutex buffer_lock;
std::condition_variable processed_cond;
std::thread poll_thread;
void poll_main();
};
template<typename F>
void remote_jtag::process
(
unsigned char *tck,
unsigned char *tms,
unsigned char *tdi,
unsigned char *trstn,
unsigned char *tdo,
F &&cycle
)
{
std::unique_lock<std::mutex> lock(this->buffer_lock);
char command;
if (this->read_bytes > 0) {
this->write_bytes = 0;
for (ssize_t i = 0; i < this->read_bytes; ++i) {
char command = this->in_buffer[i];
int dosend = 0;
char tosend = '?';
switch (command) {
case 'B':
break;
case 'b':
break;
case 'r':
*trstn = 1; //r-reset command deasserts TRST. See: openocd/blob/master/doc/manual/jtag/drivers/remote_bitbang.txt
break;
case 's':
*trstn = 1; //s-reset command deasserts TRST. See: openocd/blob/master/doc/manual/jtag/drivers/remote_bitbang.txt
break;
case 't':
*trstn = 0; //t-reset command asserts TRST. See: openocd/blob/master/doc/manual/jtag/drivers/remote_bitbang.txt
break;
case 'u':
*trstn = 0; //u-reset command asserts TRST. See: openocd/blob/master/doc/manual/jtag/drivers/remote_bitbang.txt
break;
case '0':
*tck = 0;
*tms = 0;
*tdi = 0;
break;
case '1':
*tck = 0;
*tms = 0;
*tdi = 1;
break;
case '2':
*tck = 0;
*tms = 1;
*tdi = 0;
break;
case '3':
*tck = 0;
*tms = 1;
*tdi = 1;
break;
case '4':
*tck = 1;
*tms = 0;
*tdi = 0;
break;
case '5':
*tck = 1;
*tms = 0;
*tdi = 1;
break;
case '6':
*tck = 1;
*tms = 1;
*tdi = 0;
break;
case '7':
*tck = 1;
*tms = 1;
*tdi = 1;
break;
case 'R':
dosend = 1;
tosend = *tdo ? '1' : '0';
break;
case 'Q':
fprintf(stderr, "Remote end disconnected\n");
this->dead.store(true, std::memory_order_relaxed);
break;
default:
fprintf(stderr, "remote_bitbang got unsupported command '%c'\n", command);
break;
}
if (dosend)
this->out_buffer[this->write_bytes++] = tosend;
cycle();
}
} else if (this->read_bytes < 0)
fprintf(stderr, "jtag read() failed\n");
this->readable.store(false, std::memory_order_relaxed);
lock.unlock();
this->processed_cond.notify_one();
}
#endif
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