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- // Module for interfacing with GPIO
- //#define NODE_DEBUG
- #include "module.h"
- #include "lauxlib.h"
- #include "lmem.h"
- #include "platform.h"
- #include "user_interface.h"
- #include "c_types.h"
- #include "c_string.h"
- #include "gpio.h"
- #include "hw_timer.h"
- #define PULLUP PLATFORM_GPIO_PULLUP
- #define FLOAT PLATFORM_GPIO_FLOAT
- #define OUTPUT PLATFORM_GPIO_OUTPUT
- #define OPENDRAIN PLATFORM_GPIO_OPENDRAIN
- #define INPUT PLATFORM_GPIO_INPUT
- #define INTERRUPT PLATFORM_GPIO_INT
- #define HIGH PLATFORM_GPIO_HIGH
- #define LOW PLATFORM_GPIO_LOW
- #ifdef GPIO_INTERRUPT_ENABLE
- // We also know that the non-level interrupt types are < LOLEVEL, and that
- // HILEVEL is > LOLEVEL. Since this is burned into the hardware it is not
- // going to change.
- #define INTERRUPT_TYPE_IS_LEVEL(x) ((x) >= GPIO_PIN_INTR_LOLEVEL)
- static int gpio_cb_ref[GPIO_PIN_NUM];
- // This task is scheduled by the ISR and is used
- // to initiate the Lua-land gpio.trig() callback function
- // It also re-enables the pin interrupt, so that we get another callback queued
- static void gpio_intr_callback_task (task_param_t param, uint8 priority)
- {
- unsigned pin = param >> 1;
- unsigned level = param & 1;
- UNUSED(priority);
- NODE_DBG("pin:%d, level:%d \n", pin, level);
- if(gpio_cb_ref[pin] != LUA_NOREF) {
- // GPIO callbacks are run in L0 and inlcude the level as a parameter
- lua_State *L = lua_getstate();
- NODE_DBG("Calling: %08x\n", gpio_cb_ref[pin]);
- //
- if (!INTERRUPT_TYPE_IS_LEVEL(pin_int_type[pin])) {
- // Edge triggered -- re-enable the interrupt
- platform_gpio_intr_init(pin, pin_int_type[pin]);
- }
- // Do the actual callback
- lua_rawgeti(L, LUA_REGISTRYINDEX, gpio_cb_ref[pin]);
- lua_pushinteger(L, level);
- lua_call(L, 1, 0);
- if (INTERRUPT_TYPE_IS_LEVEL(pin_int_type[pin])) {
- // Level triggered -- re-enable the callback
- platform_gpio_intr_init(pin, pin_int_type[pin]);
- }
- }
- }
- // Lua: trig( pin, type, function )
- static int lgpio_trig( lua_State* L )
- {
- unsigned pin = luaL_checkinteger( L, 1 );
- static const char * const opts[] = {"none", "up", "down", "both", "low", "high", NULL};
- static const int opts_type[] = {
- GPIO_PIN_INTR_DISABLE, GPIO_PIN_INTR_POSEDGE, GPIO_PIN_INTR_NEGEDGE,
- GPIO_PIN_INTR_ANYEDGE, GPIO_PIN_INTR_LOLEVEL, GPIO_PIN_INTR_HILEVEL
- };
- luaL_argcheck(L, platform_gpio_exists(pin) && pin>0, 1, "Invalid interrupt pin");
- int old_pin_ref = gpio_cb_ref[pin];
- int type = opts_type[luaL_checkoption(L, 2, "none", opts)];
- if (type == GPIO_PIN_INTR_DISABLE) {
- // "none" clears the callback
- gpio_cb_ref[pin] = LUA_NOREF;
- } else if (lua_gettop(L)==2 && old_pin_ref != LUA_NOREF) {
- // keep the old one if no callback
- old_pin_ref = LUA_NOREF;
- } else if (lua_type(L, 3) == LUA_TFUNCTION || lua_type(L, 3) == LUA_TLIGHTFUNCTION) {
- // set up the new callback if present
- lua_pushvalue(L, 3);
- gpio_cb_ref[pin] = luaL_ref(L, LUA_REGISTRYINDEX);
- } else {
- // invalid combination, so clear down any old callback and throw an error
- if(old_pin_ref != LUA_NOREF) luaL_unref(L, LUA_REGISTRYINDEX, old_pin_ref);
- luaL_argcheck(L, 0, 3, "invalid callback type");
- }
- // unreference any overwritten callback
- if(old_pin_ref != LUA_NOREF) luaL_unref(L, LUA_REGISTRYINDEX, old_pin_ref);
- NODE_DBG("Pin data: %d %d %08x, %d %d %d, %08x\n",
- pin, type, pin_mux[pin], pin_num[pin], pin_func[pin], pin_int_type[pin], gpio_cb_ref[pin]);
- platform_gpio_intr_init(pin, type);
- return 0;
- }
- #endif
- // Lua: mode( pin, mode, pullup )
- static int lgpio_mode( lua_State* L )
- {
- unsigned pin = luaL_checkinteger( L, 1 );
- unsigned mode = luaL_checkinteger( L, 2 );
- unsigned pullup = luaL_optinteger( L, 3, FLOAT );
- luaL_argcheck(L, platform_gpio_exists(pin) && (mode!=INTERRUPT || pin>0), 1, "Invalid pin");
- luaL_argcheck(L, mode==OUTPUT || mode==OPENDRAIN || mode==INPUT
- #ifdef GPIO_INTERRUPT_ENABLE
- || mode==INTERRUPT
- #endif
- , 2, "wrong arg type" );
- if(pullup!=FLOAT) pullup = PULLUP;
- NODE_DBG("pin,mode,pullup= %d %d %d\n",pin,mode,pullup);
- NODE_DBG("Pin data at mode: %d %08x, %d %d %d, %08x\n",
- pin, pin_mux[pin], pin_num[pin], pin_func[pin], pin_int_type[pin], gpio_cb_ref[pin]);
- #ifdef GPIO_INTERRUPT_ENABLE
- if (mode != INTERRUPT){ // disable interrupt
- if(gpio_cb_ref[pin] != LUA_NOREF){
- luaL_unref(L, LUA_REGISTRYINDEX, gpio_cb_ref[pin]);
- gpio_cb_ref[pin] = LUA_NOREF;
- }
- }
- #endif
- if( platform_gpio_mode( pin, mode, pullup ) < 0 )
- return luaL_error( L, "wrong pin num." );
- return 0;
- }
- // Lua: read( pin )
- static int lgpio_read( lua_State* L )
- {
- unsigned pin = luaL_checkinteger( L, 1 );
- MOD_CHECK_ID( gpio, pin );
- lua_pushinteger( L, platform_gpio_read( pin ) );
- return 1;
- }
- // Lua: write( pin, level )
- static int lgpio_write( lua_State* L )
- {
- unsigned pin = luaL_checkinteger( L, 1 );
- unsigned level = luaL_checkinteger( L, 2 );
- MOD_CHECK_ID( gpio, pin );
- luaL_argcheck(L, level==HIGH || level==LOW, 2, "wrong level type" );
- platform_gpio_write(pin, level);
- return 0;
- }
- #define DELAY_TABLE_MAX_LEN 256
- #define delayMicroseconds os_delay_us
- // Lua: serout( pin, firstLevel, delay_table[, repeat_num[, callback]])
- // gpio.mode(1,gpio.OUTPUT,gpio.PULLUP)
- // gpio.serout(1,1,{30,30,60,60,30,30}) -- serial one byte, b10110010
- // gpio.serout(1,1,{30,70},8) -- serial 30% pwm 10k, lasts 8 cycles
- // gpio.serout(1,1,{3,7},8) -- serial 30% pwm 100k, lasts 8 cycles
- // gpio.serout(1,1,{0,0},8) -- serial 50% pwm as fast as possible, lasts 8 cycles
- // gpio.mode(1,gpio.OUTPUT,gpio.PULLUP)
- // gpio.serout(1,0,{20,10,10,20,10,10,10,100}) -- sim uart one byte 0x5A at about 100kbps
- // gpio.serout(1,1,{8,18},8) -- serial 30% pwm 38k, lasts 8 cycles
- typedef struct
- {
- unsigned pin;
- unsigned level;
- uint32 index;
- uint32 repeats;
- uint32 *delay_table;
- uint32 tablelen;
- task_handle_t done_taskid;
- int lua_done_ref; // callback when transmission is done
- } serout_t;
- static serout_t serout;
- static const os_param_t TIMER_OWNER = 0x6770696f; // "gpio"
- static void seroutasync_done (task_param_t arg)
- {
- lua_State *L = lua_getstate();
- luaM_freearray(L, serout.delay_table, serout.tablelen, uint32);
- serout.delay_table = NULL;
- if (serout.lua_done_ref != LUA_NOREF) {
- lua_rawgeti (L, LUA_REGISTRYINDEX, serout.lua_done_ref);
- luaL_unref (L, LUA_REGISTRYINDEX, serout.lua_done_ref);
- serout.lua_done_ref = LUA_NOREF;
- if (lua_pcall(L, 0, 0, 0)) {
- // Uncaught Error. Print instead of sudden reset
- luaL_error(L, "error: %s", lua_tostring(L, -1));
- }
- }
- }
- static void ICACHE_RAM_ATTR seroutasync_cb(os_param_t p) {
- (void) p;
- if (serout.index < serout.tablelen) {
- GPIO_OUTPUT_SET(GPIO_ID_PIN(pin_num[serout.pin]), serout.level);
- serout.level = serout.level==LOW ? HIGH : LOW;
- platform_hw_timer_arm_us(TIMER_OWNER, serout.delay_table[serout.index]);
- serout.index++;
- if (serout.repeats && serout.index>=serout.tablelen) {serout.index=0; serout.repeats--;}
- } else {
- platform_hw_timer_close(TIMER_OWNER);
- task_post_low (serout.done_taskid, (task_param_t)0);
- }
- }
- static int lgpio_serout( lua_State* L )
- {
- serout.pin = luaL_checkinteger( L, 1 );
- serout.level = luaL_checkinteger( L, 2 );
- serout.repeats = luaL_optint( L, 4, 1 )-1;
- luaL_unref (L, LUA_REGISTRYINDEX, serout.lua_done_ref);
- uint8_t is_async = FALSE;
- if (!lua_isnoneornil(L, 5)) {
- if (lua_isnumber(L, 5)) {
- serout.lua_done_ref = LUA_NOREF;
- } else {
- lua_pushvalue(L, 5);
- serout.lua_done_ref = luaL_ref(L, LUA_REGISTRYINDEX);
- }
- is_async = TRUE;
- } else {
- serout.lua_done_ref = LUA_NOREF;
- }
- if (serout.delay_table) {
- luaM_freearray(L, serout.delay_table, serout.tablelen, uint32);
- serout.delay_table = NULL;
- }
- luaL_argcheck(L, platform_gpio_exists(serout.pin), 1, "Invalid pin");
- luaL_argcheck(L, serout.level==HIGH || serout.level==LOW, 2, "Wrong level type" );
- luaL_argcheck(L, lua_istable( L, 3 ) &&
- ((serout.tablelen = lua_objlen( L, 3 )) < DELAY_TABLE_MAX_LEN), 3, "Invalid delay_times" );
- serout.delay_table = luaM_newvector(L, serout.tablelen, uint32);
- for(unsigned i = 0; i < serout.tablelen; i++ ) {
- lua_rawgeti( L, 3, i + 1 );
- unsigned delay = (unsigned) luaL_checkinteger( L, -1 );
- serout.delay_table[i] = delay;
- lua_pop( L, 1 );
- }
- if (is_async) { // async version for duration above 15 mSec
- if (!platform_hw_timer_init(TIMER_OWNER, FRC1_SOURCE, TRUE)) {
- // Failed to init the timer
- luaL_error(L, "Unable to initialize timer");
- }
- platform_hw_timer_set_func(TIMER_OWNER, seroutasync_cb, 0);
- serout.index = 0;
- seroutasync_cb(0);
- } else { // sync version for sub-50 µs resolution & total duration < 15 mSec
- do {
- for( serout.index = 0;serout.index < serout.tablelen; serout.index++ ){
- NODE_DBG("%d\t%d\t%d\t%d\t%d\t%d\t%d\n", serout.repeats, serout.index, serout.level, serout.pin, serout.tablelen, serout.delay_table[serout.index], system_get_time()); // timings is delayed for short timings when debug output is enabled
- GPIO_OUTPUT_SET(GPIO_ID_PIN(pin_num[serout.pin]), serout.level);
- serout.level = serout.level==LOW ? HIGH : LOW;
- delayMicroseconds(serout.delay_table[serout.index]);
- }
- } while (serout.repeats--);
- luaM_freearray(L, serout.delay_table, serout.tablelen, uint32);
- }
- return 0;
- }
- #undef DELAY_TABLE_MAX_LEN
- // Module function map
- static const LUA_REG_TYPE gpio_map[] = {
- { LSTRKEY( "mode" ), LFUNCVAL( lgpio_mode ) },
- { LSTRKEY( "read" ), LFUNCVAL( lgpio_read ) },
- { LSTRKEY( "write" ), LFUNCVAL( lgpio_write ) },
- { LSTRKEY( "serout" ), LFUNCVAL( lgpio_serout ) },
- #ifdef GPIO_INTERRUPT_ENABLE
- { LSTRKEY( "trig" ), LFUNCVAL( lgpio_trig ) },
- { LSTRKEY( "INT" ), LNUMVAL( INTERRUPT ) },
- #endif
- { LSTRKEY( "OUTPUT" ), LNUMVAL( OUTPUT ) },
- { LSTRKEY( "OPENDRAIN" ), LNUMVAL( OPENDRAIN ) },
- { LSTRKEY( "INPUT" ), LNUMVAL( INPUT ) },
- { LSTRKEY( "HIGH" ), LNUMVAL( HIGH ) },
- { LSTRKEY( "LOW" ), LNUMVAL( LOW ) },
- { LSTRKEY( "FLOAT" ), LNUMVAL( FLOAT ) },
- { LSTRKEY( "PULLUP" ), LNUMVAL( PULLUP ) },
- { LNILKEY, LNILVAL }
- };
- int luaopen_gpio( lua_State *L ) {
- #ifdef GPIO_INTERRUPT_ENABLE
- int i;
- for(i=0;i<GPIO_PIN_NUM;i++){
- gpio_cb_ref[i] = LUA_NOREF;
- }
- platform_gpio_init(task_get_id(gpio_intr_callback_task));
- #endif
- serout.done_taskid = task_get_id((task_callback_t) seroutasync_done);
- serout.lua_done_ref = LUA_NOREF;
- return 0;
- }
- NODEMCU_MODULE(GPIO, "gpio", gpio_map, luaopen_gpio);
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