stm32: Add support for DHT11/DHT22 sensors.

drivers/dht/dht.py

@@ -1,7 +1,10 @@
 # DHT11/DHT22 driver for MicroPython on ESP8266
 # MIT license; Copyright (c) 2016 Damien P. George
 
-import esp
+try:
+    from esp import dht_readinto
+except:
+    from pyb import dht_readinto
 
 class DHTBase:
     def __init__(self, pin):
@@ -10,7 +13,7 @@ class DHTBase:
 
     def measure(self):
         buf = self.buf
-        esp.dht_readinto(self.pin, buf)
+        dht_readinto(self.pin, buf)
         if (buf[0] + buf[1] + buf[2] + buf[3]) & 0xff != buf[4]:
             raise Exception("checksum error")
 

ports/stm32/Makefile

@@ -186,6 +186,7 @@ EXTMOD_SRC_C = $(addprefix extmod/,\
 
 DRIVERS_SRC_C = $(addprefix drivers/,\
 	memory/spiflash.c \
+	dht/dht.c \
 	)
 
 SRC_C = \

ports/stm32/modpyb.c

@@ -34,6 +34,7 @@
 #include "lib/utils/pyexec.h"
 #include "lib/oofatfs/ff.h"
 #include "lib/oofatfs/diskio.h"
+#include "drivers/dht/dht.h"
 #include "gccollect.h"
 #include "stm32_it.h"
 #include "irq.h"
@@ -168,6 +169,9 @@ STATIC const mp_rom_map_elem_t pyb_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_sync), MP_ROM_PTR(&mod_os_sync_obj) },
     { MP_ROM_QSTR(MP_QSTR_mount), MP_ROM_PTR(&mp_vfs_mount_obj) },
 
+    // This function is not intended to be public and may be moved elsewhere
+    { MP_ROM_QSTR(MP_QSTR_dht_readinto), MP_ROM_PTR(&dht_readinto_obj) },
+
     { MP_ROM_QSTR(MP_QSTR_Timer), MP_ROM_PTR(&pyb_timer_type) },
 
 #if MICROPY_HW_ENABLE_RNG

ports/stm32/modules/dht.py

@@ -0,0 +1 @@
+../../../drivers/dht/dht.py