Add DHT Lua Module for interfacing with the DHTxx sensors (xx = 11-21-22-33-44).

app/dhtlib/dht.c

@@ -27,6 +27,7 @@
 // Released to the public domain
 //
 
+#include "user_interface.h"
 #include "platform.h"
 #include "dht.h"
 
@@ -51,6 +52,20 @@ static int dht_readSensor(uint8_t pin, uint8_t wakeupDelay);
 // PUBLIC
 //
 
+// return values:
+// Humidity
+double dht_getHumidity(void)
+{
+    return dht_humidity;
+}
+
+// return values:
+// Temperature
+double dht_getTemperature(void)
+{
+    return dht_temperature;
+}
+
 // return values:
 // DHTLIB_OK
 // DHTLIB_ERROR_CHECKSUM
@@ -111,6 +126,42 @@ int dht_read(uint8_t pin)
     return DHTLIB_OK;
 }
 
+// return values:
+// DHTLIB_OK
+// DHTLIB_ERROR_CHECKSUM
+// DHTLIB_ERROR_TIMEOUT
+inline int dht_read21(uint8_t pin)
+{
+    return dht_read(pin);
+}
+
+// return values:
+// DHTLIB_OK
+// DHTLIB_ERROR_CHECKSUM
+// DHTLIB_ERROR_TIMEOUT
+inline int dht_read22(uint8_t pin)
+{
+    return dht_read(pin);
+}
+
+// return values:
+// DHTLIB_OK
+// DHTLIB_ERROR_CHECKSUM
+// DHTLIB_ERROR_TIMEOUT
+inline int dht_read33(uint8_t pin)
+{
+    return dht_read(pin);
+}
+
+// return values:
+// DHTLIB_OK
+// DHTLIB_ERROR_CHECKSUM
+// DHTLIB_ERROR_TIMEOUT
+inline int dht_read44(uint8_t pin)
+{
+    return dht_read(pin);
+}
+
 /////////////////////////////////////////////////////
 //
 // PRIVATE
@@ -138,6 +189,7 @@ int dht_readSensor(uint8_t pin, uint8_t wakeupDelay)
 
     // REQUEST SAMPLE
     // pinMode(pin, OUTPUT);
+    platform_gpio_mode(pin, PLATFORM_GPIO_OUTPUT, PLATFORM_GPIO_PULLUP);
     DIRECT_MODE_OUTPUT(pin);
     // digitalWrite(pin, LOW); // T-be
     DIRECT_WRITE_LOW(pin);

app/dhtlib/dht.h

@@ -52,10 +52,13 @@
 int dht_read11(uint8_t pin);
 int dht_read(uint8_t pin);
 
-inline int dht_read21(uint8_t pin) { return dht_read(pin); };
+inline int dht_read21(uint8_t pin);
-inline int dht_read22(uint8_t pin) { return dht_read(pin); };
+inline int dht_read22(uint8_t pin);
-inline int dht_read33(uint8_t pin) { return dht_read(pin); };
+inline int dht_read33(uint8_t pin);
-inline int dht_read44(uint8_t pin) { return dht_read(pin); };
+inline int dht_read44(uint8_t pin);
+
+double dht_getHumidity(void);
+double dht_getTemperature(void);
 
 #endif
 //

app/include/user_modules.h

@@ -33,6 +33,7 @@
 #define LUA_USE_MODULES_CJSON
 #define LUA_USE_MODULES_CRYPTO
 #define LUA_USE_MODULES_RC
+#define LUA_USE_MODULES_DHT
 
 #endif /* LUA_USE_MODULES */
 

app/modules/Makefile

@@ -48,6 +48,7 @@ INCLUDES += -I ../wofs
 INCLUDES += -I ../spiffs
 INCLUDES += -I ../smart
 INCLUDES += -I ../cjson
+INCLUDES += -I ../dhtlib
 PDIR := ../$(PDIR)
 sinclude $(PDIR)Makefile
 

app/modules/auxmods.h

@@ -82,6 +82,15 @@ LUALIB_API int ( luaopen_ow )( lua_State *L );
 #define AUXLIB_CJSON    "cjson"
 LUALIB_API int ( luaopen_cjson )( lua_State *L );
 
+#define AUXLIB_CRYPTO   "crypto"
+LUALIB_API int ( luaopen_crypto )( lua_State *L );
+
+#define AUXLIB_RC       "rc"
+LUALIB_API int ( luaopen_rc )( lua_State *L );
+
+#define AUXLIB_DHT      "dht"
+LUALIB_API int ( luaopen_dht )( lua_State *L );
+
 // Helper macros
 #define MOD_CHECK_ID( mod, id )\
   if( !platform_ ## mod ## _exists( id ) )\

app/modules/dht.c

@@ -0,0 +1,80 @@
+// Module for interfacing with the DHTxx sensors (xx = 11-21-22-33-44).
+
+#include "lualib.h"
+#include "lauxlib.h"
+#include "auxmods.h"
+#include "lrotable.h"
+#include "cpu_esp8266.h"
+#include "dht.h"
+
+#define NUM_DHT GPIO_PIN_NUM
+
+// ****************************************************************************
+// DHT functions
+int platform_dht_exists( unsigned id )
+{
+  return ((id < NUM_DHT) && (id > 0));
+}
+
+// Lua: result = dht.read( id )
+static int dht_lapi_read( lua_State *L )
+{
+  unsigned id = luaL_checkinteger( L, 1 );
+  MOD_CHECK_ID( dht, id );
+  lua_pushinteger( L, dht_read(id) );
+  return 1;
+}
+
+// Lua: result = dht.read11( id )
+static int dht_lapi_read11( lua_State *L )
+{
+  unsigned id = luaL_checkinteger( L, 1 );
+  MOD_CHECK_ID( dht, id );
+  lua_pushinteger( L, dht_read11(id) );
+  return 1;
+}
+
+// Lua: result = dht.humidity()
+static int dht_lapi_humidity( lua_State *L )
+{
+  lua_pushinteger( L, dht_getHumidity() );
+  return 1;
+}
+
+// Lua: result = dht.temperature()
+static int dht_lapi_temperature( lua_State *L )
+{
+  lua_pushinteger( L, dht_getTemperature() );
+  return 1;
+}
+
+
+// Module function map
+#define MIN_OPT_LEVEL   2
+#include "lrodefs.h"
+const LUA_REG_TYPE dht_map[] =
+{
+  { LSTRKEY( "read" ),  LFUNCVAL( dht_lapi_read ) },
+  { LSTRKEY( "read11" ), LFUNCVAL( dht_lapi_read11 ) },
+  { LSTRKEY( "humidity" ),  LFUNCVAL( dht_lapi_humidity ) },
+  { LSTRKEY( "temperature" ), LFUNCVAL( dht_lapi_temperature ) },
+#if LUA_OPTIMIZE_MEMORY > 0
+  { LSTRKEY( "OK" ), LNUMVAL( DHTLIB_OK ) },
+  { LSTRKEY( "ERROR_CHECKSUM" ), LNUMVAL( DHTLIB_ERROR_CHECKSUM ) },
+  { LSTRKEY( "ERROR_TIMEOUT" ), LNUMVAL( DHTLIB_ERROR_TIMEOUT ) },
+#endif
+  { LNILKEY, LNILVAL }
+};
+
+LUALIB_API int luaopen_dht( lua_State *L )
+{
+#if LUA_OPTIMIZE_MEMORY > 0
+  return 0;
+#else // #if LUA_OPTIMIZE_MEMORY > 0
+  luaL_register( L, AUXLIB_DHT, dht_map );
+
+  // Add the constants
+
+  return 1;
+#endif // #if LUA_OPTIMIZE_MEMORY > 0
+}

app/modules/modules.h

@@ -165,6 +165,14 @@ _ROM(MODULES_RC, luaopen_rc, rc_map)
 #define ROM_MODULES_RC
 #endif
 
+#if defined(LUA_USE_MODULES_DHT)
+#define MODULES_DHT         "dht"
+#define ROM_MODULES_DHT     \
+    _ROM(MODULES_DHT, luaopen_dht, dht_map)
+#else
+#define ROM_MODULES_DHT
+#endif
+
 #define LUA_MODULES_ROM     \
         ROM_MODULES_GPIO    \
         ROM_MODULES_PWM		\
@@ -185,6 +193,7 @@ _ROM(MODULES_RC, luaopen_rc, rc_map)
         ROM_MODULES_WS2812  \
         ROM_MODULES_CJSON   \
         ROM_MODULES_CRYPTO  \
-        ROM_MODULES_RC
+        ROM_MODULES_RC      \
+        ROM_MODULES_DHT
 
 #endif

app/platform/common.c

@@ -75,6 +75,7 @@ int platform_tmr_exists( unsigned id )
   return id < NUM_TMR;
 }
 
+// ****************************************************************************
 // I2C support
 int platform_i2c_exists( unsigned id )
 {