245 lines
8.2 KiB
C
245 lines
8.2 KiB
C
// Module for interfacing with GPIO
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#include "module.h"
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#include "lauxlib.h"
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#include "lmem.h"
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#include "platform.h"
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#include "user_interface.h"
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#include "c_types.h"
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#include "c_string.h"
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#include "gpio.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 OPENDRAIN PLATFORM_GPIO_OPENDRAIN
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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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// We also know that the non-level interrupt types are < LOLEVEL, and that
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// HILEVEL is > LOLEVEL. Since this is burned into the hardware it is not
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// going to change.
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#define INTERRUPT_TYPE_IS_LEVEL(x) ((x) >= GPIO_PIN_INTR_LOLEVEL)
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static int gpio_cb_ref[GPIO_PIN_NUM];
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// This task is scheduled by the ISR and is used
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// to initiate the Lua-land gpio.trig() callback function
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// It also re-enables the pin interrupt, so that we get another callback queued
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static void gpio_intr_callback_task (task_param_t param, uint8 priority)
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{
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unsigned pin = param >> 1;
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unsigned level = param & 1;
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UNUSED(priority);
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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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// GPIO callbacks are run in L0 and inlcude the level as a parameter
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lua_State *L = lua_getstate();
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NODE_DBG("Calling: %08x\n", gpio_cb_ref[pin]);
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//
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if (!INTERRUPT_TYPE_IS_LEVEL(pin_int_type[pin])) {
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// Edge triggered -- re-enable the interrupt
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platform_gpio_intr_init(pin, pin_int_type[pin]);
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}
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// Do the actual callback
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lua_rawgeti(L, LUA_REGISTRYINDEX, gpio_cb_ref[pin]);
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lua_pushinteger(L, level);
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lua_call(L, 1, 0);
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if (INTERRUPT_TYPE_IS_LEVEL(pin_int_type[pin])) {
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// Level triggered -- re-enable the callback
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platform_gpio_intr_init(pin, pin_int_type[pin]);
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}
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}
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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 pin = luaL_checkinteger( L, 1 );
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static const char * const opts[] = {"none", "up", "down", "both", "low", "high", NULL};
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static const int opts_type[] = {
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GPIO_PIN_INTR_DISABLE, GPIO_PIN_INTR_POSEDGE, GPIO_PIN_INTR_NEGEDGE,
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GPIO_PIN_INTR_ANYEDGE, GPIO_PIN_INTR_LOLEVEL, GPIO_PIN_INTR_HILEVEL
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};
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luaL_argcheck(L, platform_gpio_exists(pin) && pin>0, 1, "Invalid interrupt pin");
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int old_pin_ref = gpio_cb_ref[pin];
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int type = opts_type[luaL_checkoption(L, 2, "none", opts)];
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if (type == GPIO_PIN_INTR_DISABLE) {
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// "none" clears the callback
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gpio_cb_ref[pin] = LUA_NOREF;
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} else if (lua_gettop(L)==2 && old_pin_ref != LUA_NOREF) {
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// keep the old one if no callback
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old_pin_ref = LUA_NOREF;
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} else if (lua_type(L, 3) == LUA_TFUNCTION || lua_type(L, 3) == LUA_TLIGHTFUNCTION) {
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// set up the new callback if present
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lua_pushvalue(L, 3);
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gpio_cb_ref[pin] = luaL_ref(L, LUA_REGISTRYINDEX);
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} else {
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// invalid combination, so clear down any old callback and throw an error
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if(old_pin_ref != LUA_NOREF) luaL_unref(L, LUA_REGISTRYINDEX, old_pin_ref);
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luaL_argcheck(L, 0, 3, "invalid callback type");
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}
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// unreference any overwritten callback
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if(old_pin_ref != LUA_NOREF) luaL_unref(L, LUA_REGISTRYINDEX, old_pin_ref);
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NODE_DBG("Pin data: %d %d %08x, %d %d %d, %08x\n",
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pin, type, pin_mux[pin], pin_num[pin], pin_func[pin], pin_int_type[pin], gpio_cb_ref[pin]);
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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 pin = luaL_checkinteger( L, 1 );
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unsigned mode = luaL_checkinteger( L, 2 );
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unsigned pullup = luaL_optinteger( L, 3, FLOAT );
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luaL_argcheck(L, platform_gpio_exists(pin) && (mode!=INTERRUPT || pin>0), 1, "Invalid pin");
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luaL_argcheck(L, mode==OUTPUT || mode==OPENDRAIN || mode==INPUT
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#ifdef GPIO_INTERRUPT_ENABLE
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|| mode==INTERRUPT
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#endif
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, 2, "wrong arg type" );
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if(pullup!=FLOAT) pullup = PULLUP;
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NODE_DBG("pin,mode,pullup= %d %d %d\n",pin,mode,pullup);
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NODE_DBG("Pin data at mode: %d %08x, %d %d %d, %08x\n",
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pin, pin_mux[pin], pin_num[pin], pin_func[pin], pin_int_type[pin], gpio_cb_ref[pin]);
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#ifdef GPIO_INTERRUPT_ENABLE
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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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gpio_cb_ref[pin] = LUA_NOREF;
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}
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}
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#endif
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if( platform_gpio_mode( pin, mode, pullup ) < 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 = luaL_checkinteger( L, 1 );
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MOD_CHECK_ID( gpio, pin );
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lua_pushinteger( L, platform_gpio_read( pin ) );
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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 pin = luaL_checkinteger( L, 1 );
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unsigned level = luaL_checkinteger( L, 2 );
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MOD_CHECK_ID( gpio, pin );
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luaL_argcheck(L, level==HIGH || level==LOW, 2, "wrong level 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 delayMicroseconds os_delay_us
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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 clocks_per_us = system_get_cpu_freq();
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unsigned pin = luaL_checkinteger( L, 1 );
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unsigned level = luaL_checkinteger( L, 2 );
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unsigned repeats = luaL_optint( L, 4, 1 );
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unsigned table_len, i, j;
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luaL_argcheck(L, platform_gpio_exists(pin), 1, "Invalid pin");
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luaL_argcheck(L, level==HIGH || level==LOW, 2, "Wrong arg type" );
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luaL_argcheck(L, lua_istable( L, 3 ) &&
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((table_len = lua_objlen( L, 3 )<DELAY_TABLE_MAX_LEN)), 3, "Invalid table" );
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luaL_argcheck(L, repeats<256, 4, "repeats >= 256" );
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uint32 *delay_table = luaM_newvector(L, table_len*repeats, uint32);
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for( i = 1; i <= table_len; i++ ) {
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lua_rawgeti( L, 3, i + 1 );
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unsigned delay = (unsigned) luaL_checkinteger( L, -1 );
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if (delay > 1000000) return luaL_error( L, "delay %u must be < 1,000,000 us", i );
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delay_table[i-1] = delay;
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lua_pop( L, 1 );
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}
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for( i = 0; i <= repeats; i++ ) {
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if (!i) // skip the first loop (presumably this is some form of icache priming??).
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continue;
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for( j = 0;j < table_len; j++ ){
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/* Direct Write is a ROM function which already disables interrupts for the atomic bit */
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GPIO_OUTPUT_SET(GPIO_ID_PIN(pin_num[pin]), level);
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delayMicroseconds(delay_table[j]);
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level = level==LOW ? HIGH : LOW;
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}
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}
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luaM_freearray(L, delay_table, table_len, uint32);
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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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static 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( "OPENDRAIN" ), LNUMVAL( OPENDRAIN ) },
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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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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(task_get_id(gpio_intr_callback_task));
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#endif
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return 0;
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}
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NODEMCU_MODULE(GPIO, "gpio", gpio_map, luaopen_gpio);
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