256 lines
7.0 KiB
C
256 lines
7.0 KiB
C
// Module for interfacing with GPIO
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#include "lauxlib.h"
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#include "platform.h"
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#include "lrodefs.h"
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#include "c_types.h"
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#include "c_string.h"
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#define PULLUP PLATFORM_GPIO_PULLUP
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#define FLOAT PLATFORM_GPIO_FLOAT
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#define OUTPUT PLATFORM_GPIO_OUTPUT
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#define INPUT PLATFORM_GPIO_INPUT
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#define INTERRUPT PLATFORM_GPIO_INT
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#define HIGH PLATFORM_GPIO_HIGH
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#define LOW PLATFORM_GPIO_LOW
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#ifdef GPIO_INTERRUPT_ENABLE
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static int gpio_cb_ref[GPIO_PIN_NUM];
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static lua_State* gL = NULL;
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void lua_gpio_unref(unsigned pin){
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if(gpio_cb_ref[pin] != LUA_NOREF){
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if(gL!=NULL)
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luaL_unref(gL, LUA_REGISTRYINDEX, gpio_cb_ref[pin]);
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}
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gpio_cb_ref[pin] = LUA_NOREF;
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}
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void gpio_intr_callback( unsigned pin, unsigned level )
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{
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NODE_DBG("pin:%d, level:%d \n", pin, level);
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if(gpio_cb_ref[pin] == LUA_NOREF)
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return;
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if(!gL)
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return;
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lua_rawgeti(gL, LUA_REGISTRYINDEX, gpio_cb_ref[pin]);
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lua_pushinteger(gL, level);
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lua_call(gL, 1, 0);
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}
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// Lua: trig( pin, type, function )
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static int lgpio_trig( lua_State* L )
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{
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unsigned type;
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unsigned pin;
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size_t sl;
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pin = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( gpio, pin );
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if(pin==0)
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return luaL_error( L, "no interrupt for D0" );
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const char *str = luaL_checklstring( L, 2, &sl );
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if (str == NULL)
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return luaL_error( L, "wrong arg type" );
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if(sl == 2 && c_strcmp(str, "up") == 0){
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type = GPIO_PIN_INTR_POSEDGE;
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}else if(sl == 4 && c_strcmp(str, "down") == 0){
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type = GPIO_PIN_INTR_NEGEDGE;
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}else if(sl == 4 && c_strcmp(str, "both") == 0){
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type = GPIO_PIN_INTR_ANYEDGE;
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}else if(sl == 3 && c_strcmp(str, "low") == 0){
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type = GPIO_PIN_INTR_LOLEVEL;
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}else if(sl == 4 && c_strcmp(str, "high") == 0){
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type = GPIO_PIN_INTR_HILEVEL;
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}else{
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type = GPIO_PIN_INTR_DISABLE;
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}
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// luaL_checkanyfunction(L, 3);
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if (lua_type(L, 3) == LUA_TFUNCTION || lua_type(L, 3) == LUA_TLIGHTFUNCTION){
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lua_pushvalue(L, 3); // copy argument (func) to the top of stack
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if(gpio_cb_ref[pin] != LUA_NOREF)
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luaL_unref(L, LUA_REGISTRYINDEX, gpio_cb_ref[pin]);
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gpio_cb_ref[pin] = luaL_ref(L, LUA_REGISTRYINDEX);
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}
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platform_gpio_intr_init(pin, type);
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return 0;
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}
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#endif
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// Lua: mode( pin, mode, pullup )
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static int lgpio_mode( lua_State* L )
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{
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unsigned mode, pullup = FLOAT;
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unsigned pin;
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pin = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( gpio, pin );
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mode = luaL_checkinteger( L, 2 );
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if ( mode!=OUTPUT && mode!=INPUT && mode!=INTERRUPT)
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return luaL_error( L, "wrong arg type" );
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if(pin==0 && mode==INTERRUPT)
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return luaL_error( L, "no interrupt for D0" );
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if(lua_isnumber(L, 3))
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pullup = lua_tointeger( L, 3 );
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if(pullup!=FLOAT)
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pullup = PULLUP;
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#ifdef GPIO_INTERRUPT_ENABLE
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gL = L; // save to local gL, for callback function
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if (mode!=INTERRUPT){ // disable interrupt
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if(gpio_cb_ref[pin] != LUA_NOREF){
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luaL_unref(L, LUA_REGISTRYINDEX, gpio_cb_ref[pin]);
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}
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gpio_cb_ref[pin] = LUA_NOREF;
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}
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#endif
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int r = platform_gpio_mode( pin, mode, pullup );
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if( r<0 )
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return luaL_error( L, "wrong pin num." );
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return 0;
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}
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// Lua: read( pin )
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static int lgpio_read( lua_State* L )
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{
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unsigned pin;
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pin = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( gpio, pin );
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unsigned level = platform_gpio_read( pin );
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lua_pushinteger( L, level );
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return 1;
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}
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// Lua: write( pin, level )
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static int lgpio_write( lua_State* L )
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{
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unsigned level;
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unsigned pin;
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pin = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( gpio, pin );
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level = luaL_checkinteger( L, 2 );
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if ( level!=HIGH && level!=LOW )
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return luaL_error( L, "wrong arg type" );
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platform_gpio_write(pin, level);
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return 0;
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}
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#define DELAY_TABLE_MAX_LEN 256
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#define noInterrupts ets_intr_lock
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#define interrupts ets_intr_unlock
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#define delayMicroseconds os_delay_us
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#define DIRECT_WRITE(pin, level) (GPIO_OUTPUT_SET(GPIO_ID_PIN(pin_num[pin]), level))
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// Lua: serout( pin, firstLevel, delay_table, [repeatNum] )
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// -- serout( pin, firstLevel, delay_table, [repeatNum] )
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// gpio.mode(1,gpio.OUTPUT,gpio.PULLUP)
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// gpio.serout(1,1,{30,30,60,60,30,30}) -- serial one byte, b10110010
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// gpio.serout(1,1,{30,70},8) -- serial 30% pwm 10k, lasts 8 cycles
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// gpio.serout(1,1,{3,7},8) -- serial 30% pwm 100k, lasts 8 cycles
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// gpio.serout(1,1,{0,0},8) -- serial 50% pwm as fast as possible, lasts 8 cycles
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// gpio.mode(1,gpio.OUTPUT,gpio.PULLUP)
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// gpio.serout(1,0,{20,10,10,20,10,10,10,100}) -- sim uart one byte 0x5A at about 100kbps
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// gpio.serout(1,1,{8,18},8) -- serial 30% pwm 38k, lasts 8 cycles
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static int lgpio_serout( lua_State* L )
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{
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unsigned level;
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unsigned pin;
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unsigned table_len = 0;
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unsigned repeat = 0;
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int delay_table[DELAY_TABLE_MAX_LEN];
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pin = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( gpio, pin );
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level = luaL_checkinteger( L, 2 );
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if ( level!=HIGH && level!=LOW )
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return luaL_error( L, "wrong arg type" );
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if( lua_istable( L, 3 ) )
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{
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table_len = lua_objlen( L, 3 );
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if (table_len <= 0 || table_len>DELAY_TABLE_MAX_LEN)
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return luaL_error( L, "wrong arg range" );
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int i;
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for( i = 0; i < table_len; i ++ )
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{
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lua_rawgeti( L, 3, i + 1 );
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delay_table[i] = ( int )luaL_checkinteger( L, -1 );
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lua_pop( L, 1 );
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if( delay_table[i] < 0 || delay_table[i] > 1000000 ) // can not delay more than 1000000 us
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return luaL_error( L, "delay must < 1000000 us" );
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}
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} else {
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return luaL_error( L, "wrong arg range" );
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}
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if(lua_isnumber(L, 4))
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repeat = lua_tointeger( L, 4 );
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if( repeat < 0 || repeat > DELAY_TABLE_MAX_LEN )
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return luaL_error( L, "delay must < 256" );
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if(repeat==0)
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repeat = 1;
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int j;
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bool skip_loop = true;
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do
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{
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if(skip_loop){ // skip the first loop.
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skip_loop = false;
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continue;
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}
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for(j=0;j<table_len;j++){
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noInterrupts();
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// platform_gpio_write(pin, level);
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DIRECT_WRITE(pin, level);
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interrupts();
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delayMicroseconds(delay_table[j]);
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level=!level;
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}
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repeat--;
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} while (repeat>0);
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return 0;
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}
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#undef DELAY_TABLE_MAX_LEN
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// Module function map
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const LUA_REG_TYPE gpio_map[] = {
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{ LSTRKEY( "mode" ), LFUNCVAL( lgpio_mode ) },
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{ LSTRKEY( "read" ), LFUNCVAL( lgpio_read ) },
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{ LSTRKEY( "write" ), LFUNCVAL( lgpio_write ) },
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{ LSTRKEY( "serout" ), LFUNCVAL( lgpio_serout ) },
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#ifdef GPIO_INTERRUPT_ENABLE
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{ LSTRKEY( "trig" ), LFUNCVAL( lgpio_trig ) },
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{ LSTRKEY( "INT" ), LNUMVAL( INTERRUPT ) },
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#endif
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{ LSTRKEY( "OUTPUT" ), LNUMVAL( OUTPUT ) },
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{ LSTRKEY( "INPUT" ), LNUMVAL( INPUT ) },
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{ LSTRKEY( "HIGH" ), LNUMVAL( HIGH ) },
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{ LSTRKEY( "LOW" ), LNUMVAL( LOW ) },
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{ LSTRKEY( "FLOAT" ), LNUMVAL( FLOAT ) },
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{ LSTRKEY( "PULLUP" ), LNUMVAL( PULLUP ) },
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{ LNILKEY, LNILVAL }
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};
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LUALIB_API int luaopen_gpio( lua_State *L ) {
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#ifdef GPIO_INTERRUPT_ENABLE
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int i;
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for(i=0;i<GPIO_PIN_NUM;i++){
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gpio_cb_ref[i] = LUA_NOREF;
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}
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platform_gpio_init(gpio_intr_callback);
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#endif
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#if MIN_OPT_LEVEL==2 && LUA_OPTIMIZE_MEMORY==2
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return 0;
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#else
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# error "NodeMCU modules must be build with LTR enabled (MIN_OPT_LEVEL=2 and LUA_OPTIMIZE_MEMORY=2)"
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#endif
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}
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