Cannot get gpio.PULLDOWN working
Posted: Thu Feb 12, 2015 2:10 pmHi,
I tried to get PULLDOWN on GPIO pins working, but I am failing so far. I see, that platform.c already contains the necessary code:
so I made the following changes to gpio.c, to make it available from Lua:
Now when calling
I am sure the PLATFORM_GPIO_PULLDOWN case in platform.c is executed (added a c_printf() call there to check), but the result on the pin is the same as with PULLUP.
Any hints?
I tried to get PULLDOWN on GPIO pins working, but I am failing so far. I see, that platform.c already contains the necessary code:
Code: Select all
case PLATFORM_GPIO_PULLDOWN:
PIN_PULLUP_DIS(pin_mux[pin]);
PIN_PULLDWN_EN(pin_mux[pin]);
break;
so I made the following changes to gpio.c, to make it available from Lua:
Code: Select all
--- gpio.c_orig 2015-02-05 19:04:09.000000000 +0100
+++ gpio.c 2015-02-11 22:42:07.297420800 +0100
@@ -10,8 +10,9 @@
#include "c_types.h"
#include "c_string.h"
-#define PULLUP PLATFORM_GPIO_PULLUP
#define FLOAT PLATFORM_GPIO_FLOAT
+#define PULLUP PLATFORM_GPIO_PULLUP
+#define PULLDOWN PLATFORM_GPIO_PULLDOWN
#define OUTPUT PLATFORM_GPIO_OUTPUT
#define INPUT PLATFORM_GPIO_INPUT
#define INTERRUPT PLATFORM_GPIO_INT
@@ -86,10 +87,11 @@
}
#endif
-// Lua: mode( pin, mode, pullup )
+// Lua: mode( pin, mode, pull )
static int lgpio_mode( lua_State* L )
{
- unsigned mode, pullup = FLOAT;
+ unsigned mode;
+ unsigned pull = FLOAT;
unsigned pin;
pin = luaL_checkinteger( L, 1 );
@@ -100,9 +102,7 @@
if(pin==0 && mode==INTERRUPT)
return luaL_error( L, "no interrupt for D0" );
if(lua_isnumber(L, 3))
- pullup = lua_tointeger( L, 3 );
- if(pullup!=FLOAT)
- pullup = PULLUP;
+ pull = lua_tointeger( L, 3 );
#ifdef GPIO_INTERRUPT_ENABLE
gL = L; // save to local gL, for callback function
if (mode!=INTERRUPT){ // disable interrupt
@@ -112,7 +112,7 @@
gpio_cb_ref[pin] = LUA_NOREF;
}
#endif
- int r = platform_gpio_mode( pin, mode, pullup );
+ int r = platform_gpio_mode( pin, mode, pull );
if( r<0 )
return luaL_error( L, "wrong pin num." );
return 0;
@@ -167,6 +167,7 @@
{ LSTRKEY( "LOW" ), LNUMVAL( LOW ) },
{ LSTRKEY( "FLOAT" ), LNUMVAL( FLOAT ) },
{ LSTRKEY( "PULLUP" ), LNUMVAL( PULLUP ) },
+ { LSTRKEY( "PULLDOWN" ), LNUMVAL( PULLDOWN ) },
#endif
{ LNILKEY, LNILVAL }
};
@@ -195,6 +196,7 @@
MOD_REG_NUMBER( L, "LOW", LOW );
MOD_REG_NUMBER( L, "FLOAT", FLOAT );
MOD_REG_NUMBER( L, "PULLUP", PULLUP );
+ MOD_REG_NUMBER( L, "PULLDOWN", PULLDOWN );
return 1;
#endif // #if LUA_OPTIMIZE_MEMORY > 0
}
Now when calling
Code: Select all
gpio.mode(4, gpio.INPUT, gpio.PULLDOWN)I am sure the PLATFORM_GPIO_PULLDOWN case in platform.c is executed (added a c_printf() call there to check), but the result on the pin is the same as with PULLUP.
Any hints?