RS232_LIB unsigned int
rs232_write_timeout(struct rs232_port_t *p, unsigned char *buf,
unsigned int buf_len, unsigned int *write_len,
unsigned int timeout)
{
unsigned int w = 0;
struct rs232_windows_t *wx = p->pt;
unsigned int wt = wx->w_timeout;
DBG("p=%p p->pt=%p buf_len:%d\n", (void *)p, p->pt, buf_len);
if (!rs232_port_open(p))
return RS232_ERR_PORT_CLOSED;
if (port_timeout(p, wx->r_timeout, timeout))
return RS232_ERR_UNKNOWN;
if (!WriteFile(wx->fd, buf, buf_len, &w, NULL)) {
*write_len = 0;
DBG("WriteFile() %s\n", last_error());
return RS232_ERR_WRITE;
}
if (port_timeout(p, wx->r_timeout, wt))
return RS232_ERR_UNKNOWN;
*write_len = w;
DBG("write_len=%d hex='%s' ascii='%s'\n", w, rs232_hex_dump(buf, w),
rs232_ascii_dump(buf, w));
return RS232_ERR_NOERROR;
}
RS232_LIB unsigned int
rs232_read_timeout(struct rs232_port_t *p, unsigned char *buf,
unsigned int buf_len, unsigned int *read_len,
unsigned int timeout)
{
unsigned int r = 0;
struct rs232_windows_t *wx = p->pt;
unsigned int rt = wx->r_timeout;
DBG("p=%p p->pt=%p buf_len: %d timeout: %d\n", (void *)p, p->pt, buf_len, timeout);
if (!rs232_port_open(p))
return RS232_ERR_PORT_CLOSED;
*read_len = 0;
if (port_timeout(p, timeout, wx->w_timeout))
return RS232_ERR_UNKNOWN;
if (!ReadFile(wx->fd, buf, buf_len, &r, NULL)) {
*read_len = 0;
DBG("ReadFile() %s\n", last_error());
return RS232_ERR_READ;
}
if (port_timeout(p, rt, wx->w_timeout))
return RS232_ERR_UNKNOWN;
*read_len = r;
DBG("read_len=%d hex='%s' ascii='%s'\n", r, rs232_hex_dump(buf, r),
rs232_ascii_dump(buf, r));
return RS232_ERR_NOERROR;
}
RS232_LIB unsigned int
rs232_read_timeout(struct rs232_port_t *p, unsigned char *buf,
unsigned int buf_len, unsigned int *read_len,
unsigned int timeout)
{
unsigned int r = 0;
struct rs232_windows_t *wx = p->pt;
unsigned int rt = wx->r_timeout;
DBG("p=%p p->pt=%p buf_len: %d timeout: %d\n", (void *)p, p->pt, buf_len, timeout);
if (!rs232_port_open(p))
return RS232_ERR_PORT_CLOSED;
*read_len = 0;
if (port_timeout(p, timeout, wx->w_timeout))
return RS232_ERR_UNKNOWN;
if (!ReadFile(wx->fd, buf, buf_len, &r, NULL)) {
*read_len = 0;
DBG("ReadFile() %s\n", last_error());
return RS232_ERR_READ;
}
if (port_timeout(p, rt, wx->w_timeout))
return RS232_ERR_UNKNOWN;
*read_len = r;
DBG("read_len=%d hex='%s' ascii='%s'\n", r, rs232_hex_dump(buf, r),
rs232_ascii_dump(buf, r));
/* TODO - This is lame, since we rely on the fact, that if we read 0 bytes,
* that the read probably timeouted. So we should rather measure the reading
* interval or rework it using overlapped I/O */
return *read_len == 0 ? RS232_ERR_TIMEOUT : RS232_ERR_NOERROR;
}
