mimxrt: Add dht_readinto() to the mimxrt module, and freeze dht.py.

The change affects dht.py from the drivers directory as well to include the
logic for the mimxrt port.

drivers/dht/dht.py

@@ -1,9 +1,13 @@
 # DHT11/DHT22 driver for MicroPython on ESP8266
 # MIT license; Copyright (c) 2016 Damien P. George
 
-try:
+import sys
+
+if sys.platform.startswith("esp"):
     from esp import dht_readinto
-except:
+elif sys.platform == "mimxrt":
+    from mimxrt import dht_readinto
+else:
     from pyb import dht_readinto
 
 

ports/mimxrt/Makefile

@@ -213,6 +213,7 @@ SRC_C += \
 	board_init.c \
 	dma_channel.c \
 	drivers/bus/softspi.c \
+	drivers/dht/dht.c \
 	eth.c \
 	extmod/modnetwork.c \
 	extmod/modonewire.c \

ports/mimxrt/boards/manifest.py

@@ -1,3 +1,4 @@
 freeze("$(PORT_DIR)/modules")
 freeze("$(MPY_DIR)/drivers/onewire")
+freeze("$(MPY_DIR)/drivers/dht", "dht.py")
 include("$(MPY_DIR)/extmod/uasyncio/manifest.py")

ports/mimxrt/modmimxrt.c

@@ -24,12 +24,16 @@
  * THE SOFTWARE.
  */
 
+#include "py/mperrno.h"
 #include "py/runtime.h"
+#include "drivers/dht/dht.h"
 #include "modmimxrt.h"
 
 STATIC const mp_rom_map_elem_t mimxrt_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__),            MP_ROM_QSTR(MP_QSTR_mimxrt) },
     { MP_ROM_QSTR(MP_QSTR_Flash),               MP_ROM_PTR(&mimxrt_flash_type) },
+
+    { MP_ROM_QSTR(MP_QSTR_dht_readinto), MP_ROM_PTR(&dht_readinto_obj) },
 };
 STATIC MP_DEFINE_CONST_DICT(mimxrt_module_globals, mimxrt_module_globals_table);