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;
}
/*
* error, data, read_len = port:read(max_read_len [[, timeout_ms], forced])
*
* if forced > 0 then read() blocks until 'timeout_ms' or there's 'max_read_len'
* bytes available
*/
static int lua_port_read(lua_State *L)
{
int ret = 0;
int argc = 0;
int forced = 0;
unsigned int timeout = 0;
unsigned int len = 0;
unsigned int bytes_read = 0;
unsigned char *data = NULL;
struct rs232_port_t *p = NULL;
p = *(struct rs232_port_t**) luaL_checkudata(L, 1, MODULE_NAMESPACE);
lua_remove(L, 1);
if (p == NULL || !rs232_port_open(p)) {
lua_pushinteger(L, RS232_ERR_PORT_CLOSED);
lua_pushnil(L);
lua_pushinteger(L, 0);
return 3;
}
argc = lua_gettop(L);
switch (argc) {
case 1:
len = (unsigned int) luaL_checkinteger(L, 1);
data = (unsigned char*) malloc(len * sizeof(unsigned char *));
memset(data, 0, len);
ret = rs232_read(p, data, len, &bytes_read);
break;
case 2:
case 3:
len = (unsigned int) luaL_checknumber(L, 1);
data = (unsigned char*) malloc(len * sizeof(unsigned char *));
memset(data, 0, len);
timeout = (unsigned int) luaL_checknumber(L, 2);
forced = luaL_optint(L, 3, 0);
if (forced > 0)
ret = rs232_read_timeout_forced(p, data, len, &bytes_read, timeout);
else
ret = rs232_read_timeout(p, data, len, &bytes_read, timeout);
break;
default:
lua_pushinteger(L, RS232_ERR_UNKNOWN);
lua_pushnil(L);
lua_pushinteger(L, 0);
return 3;
}
DBG("ret=%d hex='%s' bytes_read=%d\n",
ret, rs232_hex_dump(data, bytes_read), bytes_read);
lua_pushinteger(L, ret);
if (bytes_read > 0)
lua_pushlstring(L, (char *) data, bytes_read);
else
lua_pushnil(L);
if (data)
free(data);
lua_pushinteger(L, bytes_read);
return 3;
}
