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#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifndef AF_INET
#include <sys/socket.h>
#endif
#ifndef INADDR_ANY
#include <netinet/in.h>
#endif
#include <algorithm>
#include <cassert>
#include <cstdio>
#include "remote_bitbang.h"
#if 1
# define D(x) x
#else
# define D(x)
#endif
/////////// remote_bitbang_t
remote_bitbang_t::remote_bitbang_t(uint16_t port, jtag_dtm_t *tap) :
tap(tap),
socket_fd(0),
client_fd(0),
recv_start(0),
recv_end(0)
{
socket_fd = socket(AF_INET, SOCK_STREAM, 0);
if (socket_fd == -1) {
fprintf(stderr, "remote_bitbang failed to make socket: %s (%d)\n",
strerror(errno), errno);
abort();
}
fcntl(socket_fd, F_SETFL, O_NONBLOCK);
int reuseaddr = 1;
if (setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &reuseaddr,
sizeof(int)) == -1) {
fprintf(stderr, "remote_bitbang failed setsockopt: %s (%d)\n",
strerror(errno), errno);
abort();
}
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(port);
if (bind(socket_fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
fprintf(stderr, "remote_bitbang failed to bind socket: %s (%d)\n",
strerror(errno), errno);
abort();
}
if (listen(socket_fd, 1) == -1) {
fprintf(stderr, "remote_bitbang failed to listen on socket: %s (%d)\n",
strerror(errno), errno);
abort();
}
socklen_t addrlen = sizeof(addr);
if (getsockname(socket_fd, (struct sockaddr *) &addr, &addrlen) == -1) {
fprintf(stderr, "remote_bitbang getsockname failed: %s (%d)\n",
strerror(errno), errno);
abort();
}
printf("Listening for remote bitbang connection on port %d.\n",
ntohs(addr.sin_port));
fflush(stdout);
}
void remote_bitbang_t::accept()
{
client_fd = ::accept(socket_fd, NULL, NULL);
if (client_fd == -1) {
if (errno == EAGAIN) {
// No client waiting to connect right now.
} else {
fprintf(stderr, "failed to accept on socket: %s (%d)\n", strerror(errno),
errno);
abort();
}
} else {
fcntl(client_fd, F_SETFL, O_NONBLOCK);
}
}
void remote_bitbang_t::tick()
{
if (client_fd > 0) {
execute_commands();
} else {
this->accept();
}
}
void remote_bitbang_t::execute_commands()
{
static char send_buf[buf_size];
unsigned total_processed = 0;
bool quit = false;
bool in_rti = tap->state() == RUN_TEST_IDLE;
bool entered_rti = false;
while (1) {
if (recv_start < recv_end) {
unsigned send_offset = 0;
while (recv_start < recv_end) {
uint8_t command = recv_buf[recv_start];
switch (command) {
case 'B': /* fprintf(stderr, "*BLINK*\n"); */ break;
case 'b': /* fprintf(stderr, "_______\n"); */ break;
case 'r': tap->reset(); break;
case '0': tap->set_pins(0, 0, 0); break;
case '1': tap->set_pins(0, 0, 1); break;
case '2': tap->set_pins(0, 1, 0); break;
case '3': tap->set_pins(0, 1, 1); break;
case '4': tap->set_pins(1, 0, 0); break;
case '5': tap->set_pins(1, 0, 1); break;
case '6': tap->set_pins(1, 1, 0); break;
case '7': tap->set_pins(1, 1, 1); break;
case 'R': send_buf[send_offset++] = tap->tdo() ? '1' : '0'; break;
case 'Q': quit = true; break;
default:
fprintf(stderr, "remote_bitbang got unsupported command '%c'\n",
command);
}
recv_start++;
total_processed++;
if (!in_rti && tap->state() == RUN_TEST_IDLE) {
entered_rti = true;
break;
}
in_rti = false;
}
unsigned sent = 0;
while (sent < send_offset) {
ssize_t bytes = write(client_fd, send_buf + sent, send_offset);
if (bytes == -1) {
fprintf(stderr, "failed to write to socket: %s (%d)\n", strerror(errno), errno);
abort();
}
sent += bytes;
}
}
if (total_processed > buf_size || quit || entered_rti) {
// Don't go forever, because that could starve the main simulation.
break;
}
recv_start = 0;
recv_end = read(client_fd, recv_buf, buf_size);
if (recv_end == -1) {
if (errno == EAGAIN) {
break;
} else {
fprintf(stderr, "remote_bitbang failed to read on socket: %s (%d)\n",
strerror(errno), errno);
abort();
}
}
if (quit) {
fprintf(stderr, "Remote Bitbang received 'Q'\n");
}
if (recv_end == 0 || quit) {
// The remote disconnected.
fprintf(stderr, "Received nothing. Quitting.\n");
close(client_fd);
client_fd = 0;
break;
}
}
}
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