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/*
* xbee_io.c
* xbee_test
*
* Created by Tymm on 11/20/08.
* Copyright 2008 __MyCompanyName__. All rights reserved.
*
*/
#include <unistd.h>
#include <string.h>
#include <stdint.h>
#include <sys/select.h>
#include <pthread.h>
#ifdef PD
#include "m_pd.h"
#include "max2pd.h"
#else
#include "ext.h"
#endif /* PD */
#include "xbee.h"
#include "xbee_io.h"
#ifndef MIN
# define MIN(a,b) ((a)<(b)?(a):(b))
#endif
void xbee_io_read(xbee_t *xbee)
{
int r;
char data[128];
xbee_io_context_t *ctx = xbee_user_context(*xbee);
int xbee_fd = ctx->fd;
r = read(xbee_fd, data, sizeof(data));
if (r <= 0) {
return;
}
xbee_in(xbee, data, r);
}
void xbee_io_write(xbee_t *xbee)
{
int r;
int max_bytes_to_write;
xbee_io_context_t *ctx = xbee_user_context(*xbee);
int xbee_fd = ctx->fd;
int tmp_start = ctx->out_buffer_start;
if (tmp_start != ctx->out_buffer_end) {
max_bytes_to_write = (ctx->out_buffer_end + XBEE_IO_BUFSIZ - ctx->out_buffer_start) % XBEE_IO_BUFSIZ;
//for (r = 0; r < MIN(max_bytes_to_write, XBEE_IO_BUFSIZ - tmp_start); r++) {
// post("%02x", (unsigned char)ctx->out_buffer[tmp_start + r]);
//}
r = write(xbee_fd, (char *)(ctx->out_buffer + tmp_start), MIN(max_bytes_to_write, XBEE_IO_BUFSIZ - tmp_start));
if (r < 0) {
return;
}
tmp_start += r;
tmp_start %= XBEE_IO_BUFSIZ;
ctx->out_buffer_start = tmp_start;
if (tmp_start == 0) {
max_bytes_to_write -= r;
r = write(xbee_fd, (char *)(ctx->out_buffer), max_bytes_to_write);
if (r < 0) {
return;
}
tmp_start += r;
tmp_start %= XBEE_IO_BUFSIZ;
}
ctx->out_buffer_start = tmp_start;
}
}
int xbee_put_data(xbee_io_context_t *ctx, char *data, int len)
{
int byte_count = 0;
int max_bytes;
int tmp_end = ctx->out_buffer_end;
max_bytes = MIN((ctx->out_buffer_start + XBEE_IO_BUFSIZ - tmp_end - 1) % XBEE_IO_BUFSIZ, len);
byte_count = MIN(max_bytes, XBEE_IO_BUFSIZ - tmp_end);
memcpy((char *)(ctx->out_buffer + tmp_end), data, byte_count);
if (byte_count != max_bytes) {
memcpy((char *)(ctx->out_buffer), data + byte_count, max_bytes - byte_count);
}
tmp_end += max_bytes;
tmp_end %= XBEE_IO_BUFSIZ;
ctx->out_buffer_end = tmp_end;
return max_bytes;
}
void *xbee_io_loop(void *param)
{
int xbee_fd;
fd_set r_fds, w_fds;
int nfds = 0;
struct timeval timeout;
struct timeval timeout_orig = { .tv_sec = 1, .tv_usec = 0 };
xbee_t *xbee = param;
xbee_io_context_t *ctx = xbee_user_context(*xbee);
int notif_fd;
int maxfd;
xbee_fd = ctx->fd;
notif_fd = ctx->pipe_fds[0];
FD_ZERO(&r_fds);
FD_ZERO(&w_fds);
while(1) {
if (ctx->io_done) {
break;
}
nfds = 0;
FD_SET(notif_fd, &r_fds);
maxfd = notif_fd;
FD_SET(xbee_fd, &r_fds);
if (xbee_fd > maxfd)
maxfd = xbee_fd;
FD_CLR(xbee_fd, &w_fds);
if (ctx->out_buffer_start != ctx->out_buffer_end) {
FD_SET(xbee_fd, &w_fds);
}
// For Linux compat
timeout = timeout_orig;
nfds = select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
if (nfds >= 1) {
if (FD_ISSET(notif_fd, &r_fds)) {
// We've been notified that there's data to be read, or need to exit
char blah;
read(notif_fd, &blah, 1);
}
if (FD_ISSET(xbee_fd, &r_fds)) {
xbee_io_read(xbee);
}
if (FD_ISSET(xbee_fd, &w_fds)) {
xbee_io_write(xbee);
}
}
}
ctx->io_running = 0;
return NULL;
}
int xbee_kill_io_thread(xbee_t *xbee)
{
xbee_io_context_t *ctx;
void *val;
ctx = xbee_user_context(*xbee);
if (ctx != NULL) {
if (ctx->io_running) {
ctx->io_done = 1;
write(ctx->pipe_fds[1], "!", 1);
if (pthread_join(ctx->io_thread, &val) < 0) {
return -1;
}
post("xbee_test: xbee io thread stopped.");
}
}
return 0;
}
int xbee_new_io_thread(xbee_t *xbee)
{
xbee_io_context_t *ctx = xbee_user_context(*xbee);
int r;
if (!ctx->io_running) {
ctx->io_running = 1;
r = pthread_create(&ctx->io_thread, NULL, &xbee_io_loop, (void *)xbee);
if (r < 0) {
ctx->io_running = 0;
return -1;
}
post("xbee_test: xbee io thread started.");
}
return 0;
}
int xbee_out(xbee_t *xbee, xbee_pkt_t *pkt, uint8_t len)
{
xbee_io_context_t *ctx = xbee_user_context(*xbee);
int r;
r = xbee_put_data(ctx, (void *)pkt, len);
xbee_free_pkt_mem(pkt);
return r;
}
int xbee_recv_pkt(xbee_t *xbee, xbee_pkt_t *pkt, uint8_t len)
{
//int i;
//for (i = 0; i < len; i++) {
// post("GOT %02x", ((unsigned char *)pkt)[i]);
//}
xbee_free_pkt_mem(pkt);
return 0;
}
void *xbee_alloc_pkt_mem(uint8_t direction, uint8_t len)
{
return sysmem_newptr(128);
}
void xbee_free_pkt_mem(xbee_pkt_t *pkt)
{
sysmem_freeptr(pkt);
}
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