void test_loopback(void) {
serial_t serial;
unsigned int count;
time_t start, stop;
uint8_t lorem_ipsum[] = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";
uint8_t lorem_hugesum[4096*3];
uint8_t buf[sizeof(lorem_hugesum)];
ptest();
passert(serial_open(&serial, device, 115200) == 0);
/* Test write/flush/read */
passert(serial_write(&serial, lorem_ipsum, sizeof(lorem_ipsum)) == sizeof(lorem_ipsum));
passert(serial_flush(&serial) == 0);
passert(serial_read(&serial, buf, sizeof(lorem_ipsum), -1) == sizeof(lorem_ipsum));
passert(memcmp(lorem_ipsum, buf, sizeof(lorem_ipsum)) == 0);
/* Test poll/write/flush/poll/input waiting/read */
passert(serial_poll(&serial, 500) == 0); /* Should timeout */
passert(serial_write(&serial, lorem_ipsum, sizeof(lorem_ipsum)) == sizeof(lorem_ipsum));
passert(serial_flush(&serial) == 0);
passert(serial_poll(&serial, 500) == 1);
usleep(500000);
passert(serial_input_waiting(&serial, &count) == 0);
passert(count == sizeof(lorem_ipsum));
passert(serial_read(&serial, buf, sizeof(lorem_ipsum), -1) == sizeof(lorem_ipsum));
passert(memcmp(lorem_ipsum, buf, sizeof(lorem_ipsum)) == 0);
/* Test non-blocking poll */
passert(serial_poll(&serial, 0) == 0);
/* Test a very large read-write (likely to exceed internal buffer size (~4096)) */
memset(lorem_hugesum, 0xAA, sizeof(lorem_hugesum));
passert(serial_write(&serial, lorem_hugesum, sizeof(lorem_hugesum)) == sizeof(lorem_hugesum));
passert(serial_flush(&serial) == 0);
passert(serial_read(&serial, buf, sizeof(lorem_hugesum), -1) == sizeof(lorem_hugesum));
passert(memcmp(lorem_hugesum, buf, sizeof(lorem_hugesum)) == 0);
/* Test read timeout */
start = time(NULL);
passert(serial_read(&serial, buf, sizeof(buf), 2000) == 0);
stop = time(NULL);
passert((stop - start) > 1);
/* Test non-blocking read */
start = time(NULL);
passert(serial_read(&serial, buf, sizeof(buf), 0) == 0);
stop = time(NULL);
/* Assuming we weren't context switched out for a second and weren't on a
* thin time boundary ;) */
passert((stop - start) == 0);
passert(serial_close(&serial) == 0);
}
static int lua_serial_input_waiting(lua_State *L) {
serial_t *serial;
int count;
int ret;
serial = luaL_checkudata(L, 1, "periphery.Serial");
if ((ret = serial_input_waiting(serial, &count)) < 0)
return lua_serial_error(L, ret, serial_errno(serial), "Error: %s", serial_errmsg(serial));
lua_pushinteger(L, count);
return 1;
}
