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nodemcu-firmware/app/modules/gpio.c

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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)
{
uint32_t then = (param >> 8) & 0xffffff;
uint32_t pin = (param >> 1) & 127;
uint32_t level = param & 1;
UNUSED(priority);
uint32_t now = system_get_time();
// Now must be >= then . Add the missing bits
if (then > (now & 0xffffff)) {
// Now must have rolled over since the interrupt -- back it down
now -= 0x1000000;
}
then = (then + (now & 0x7f000000)) & 0x7fffffff;
NODE_DBG("pin:%d, level:%d \n", pin, level);
if(gpio_cb_ref[pin] != LUA_NOREF) {
// GPIO callbacks are run in L0 and include the level as a parameter
lua_State *L = lua_getstate();
NODE_DBG("Calling: %08x\n", gpio_cb_ref[pin]);
bool needs_callback = 1;
while (needs_callback) {
// Note that the interrupt level only modifies 'seen' and
// the base level only modifies 'reported'.
// Do the actual callback
lua_rawgeti(L, LUA_REGISTRYINDEX, gpio_cb_ref[pin]);
lua_pushinteger(L, level);
lua_pushinteger(L, then);
uint16_t seen = pin_counter[pin].seen;
lua_pushinteger(L, 0x7fff & (seen - pin_counter[pin].reported));
pin_counter[pin].reported = seen & 0x7fff; // This will cause the next interrupt to trigger a callback
uint16_t diff = (seen ^ pin_counter[pin].seen);
// Needs another callback if seen changed but not if the top bit is set
needs_callback = diff <= 0x7fff && diff > 0;
if (needs_callback) {
// Fake this for next time (this only happens if another interrupt happens since
// we loaded the 'seen' variable.
then = system_get_time() & 0x7fffffff;
}
lua_call(L, 3, 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);
uint16_t seen;
// Make sure that we clear out any queued interrupts
do {
seen = pin_counter[pin].seen;
pin_counter[pin].reported = seen & 0x7fff;
} while (seen != pin_counter[pin].seen);
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],
#ifdef GPIO_INTERRUPT_ENABLE
pin_int_type[pin], gpio_cb_ref[pin]
#else
0, 0
#endif
);
#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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