123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233 |
- // Module for interfacing with the I2C interface
- #include "module.h"
- #include "lauxlib.h"
- #include "lextra.h"
- #include "platform.h"
- #include "i2c_common.h"
- // Lua: i2c.setup( id, sda, scl, speed )
- static int i2c_setup( lua_State *L )
- {
- unsigned id = luaL_checkinteger( L, 1 );
- unsigned sda = luaL_checkinteger( L, 2 );
- unsigned scl = luaL_checkinteger( L, 3 );
- uint32_t speed = (uint32_t)luaL_checkinteger( L, 4 );
- luaL_argcheck( L, id < I2C_ID_MAX, 1, "invalid id" );
- MOD_CHECK_ID( gpio, sda );
- MOD_CHECK_ID( gpio, scl );
- if (id == I2C_ID_SW) {
- luaL_argcheck( L, speed <= PLATFORM_I2C_SPEED_SLOW, 4, "wrong arg range" );
- if (!platform_i2c_setup( id, sda, scl, (uint32_t)speed ))
- luaL_error( L, "setup failed" );
- } else {
- luaL_argcheck( L, speed <= PLATFORM_I2C_SPEED_FASTPLUS, 4, "wrong arg range" );
- li2c_hw_master_setup( L, id, sda, scl, speed );
- }
- return 0;
- }
- // Lua: i2c.start( id )
- static int i2c_start( lua_State *L )
- {
- unsigned id = luaL_checkinteger( L, 1 );
- luaL_argcheck( L, id < I2C_ID_MAX, 1, "invalid id" );
- if (id == I2C_ID_SW) {
- if (!platform_i2c_send_start( id ))
- luaL_error( L, "command failed");
- } else {
- li2c_hw_master_start( L, id );
- }
- return 0;
- }
- // Lua: i2c.stop( id )
- static int i2c_stop( lua_State *L )
- {
- unsigned id = luaL_checkinteger( L, 1 );
- luaL_argcheck( L, id < I2C_ID_MAX, 1, "invalid id" );
- if (id == I2C_ID_SW) {
- if (!platform_i2c_send_stop( id ))
- luaL_error( L, "command failed" );
- } else {
- li2c_hw_master_stop( L, id );
- }
- return 0;
- }
- // Lua: status = i2c.address( id, address, direction )
- static int i2c_address( lua_State *L )
- {
- int stack = 0;
- unsigned id = luaL_checkinteger( L, ++stack );
- luaL_argcheck( L, id < I2C_ID_MAX, stack, "invalid id" );
- int address = luaL_checkinteger( L, ++stack );
- luaL_argcheck( L, address >= 0 && address <= 127, stack, "wrong arg range" );
- int direction = luaL_checkinteger( L, ++stack );
- luaL_argcheck( L,
- direction == PLATFORM_I2C_DIRECTION_TRANSMITTER ||
- direction == PLATFORM_I2C_DIRECTION_RECEIVER,
- stack, "wrong arg range" );
- bool ack_check_en = luaL_optbool( L, ++stack, true );
- int ret;
- if (id == I2C_ID_SW) {
- ret = platform_i2c_send_address( id, (uint16_t)address, direction, ack_check_en ? 1 : 0 );
- } else {
- ret = li2c_hw_master_address( L, id, (uint16_t)address, direction, ack_check_en );
- }
- lua_pushboolean( L, ret > 0 );
- return 1;
- }
- // Lua: wrote = i2c.write( id, data1, [data2], ..., [datan] )
- // data can be either a string, a table or an 8-bit number
- static int i2c_write( lua_State *L )
- {
- unsigned id = luaL_checkinteger( L, 1 );
- luaL_argcheck( L, id < I2C_ID_MAX, 1, "invalid id" );
- const char *pdata;
- size_t datalen, i;
- int numdata;
- uint32_t wrote = 0;
- unsigned argn;
- bool ack_check_en = true;
- if (lua_isboolean( L, -1 )) {
- ack_check_en = lua_toboolean( L, -1 );
- lua_pop( L, 1 );
- }
- if( lua_gettop( L ) < 2 )
- return luaL_error( L, "wrong arg type" );
- for( argn = 2; argn <= lua_gettop( L ); argn ++ )
- {
- // lua_isnumber() would silently convert a string of digits to an integer
- // whereas here strings are handled separately.
- if( lua_type( L, argn ) == LUA_TNUMBER )
- {
- numdata = ( int )luaL_checkinteger( L, argn );
- if( numdata < 0 || numdata > 255 )
- return luaL_error( L, "wrong arg range" );
- if (id == I2C_ID_SW) {
- if( platform_i2c_send_byte( id, numdata, 1) != 1 && ack_check_en )
- break;
- } else {
- li2c_hw_master_write( L, id, numdata, ack_check_en );
- }
- wrote ++;
- }
- else if( lua_istable( L, argn ) )
- {
- datalen = lua_objlen( L, argn );
- for( i = 0; i < datalen; i ++ )
- {
- lua_rawgeti( L, argn, i + 1 );
- numdata = ( int )luaL_checkinteger( L, -1 );
- lua_pop( L, 1 );
- if( numdata < 0 || numdata > 255 )
- return luaL_error( L, "wrong arg range" );
- if (id == I2C_ID_SW) {
- if( platform_i2c_send_byte( id, numdata, 1 ) == 0 && ack_check_en)
- break;
- } else {
- li2c_hw_master_write( L, id, numdata, ack_check_en );
- }
- }
- wrote += i;
- if( i < datalen )
- break;
- }
- else
- {
- pdata = luaL_checklstring( L, argn, &datalen );
- for( i = 0; i < datalen; i ++ )
- if (id == I2C_ID_SW) {
- if( platform_i2c_send_byte( id, pdata[ i ], 1 ) == 0 && ack_check_en)
- break;
- } else {
- li2c_hw_master_write( L, id, pdata[ i ], ack_check_en );
- }
- wrote += i;
- if( i < datalen )
- break;
- }
- }
- lua_pushinteger( L, wrote );
- return 1;
- }
- // Lua: read = i2c.read( id, size )
- static int i2c_read( lua_State *L )
- {
- unsigned id = luaL_checkinteger( L, 1 );
- luaL_argcheck( L, id < I2C_ID_MAX, 1, "invalid id" );
- uint32_t size = ( uint32_t )luaL_checkinteger( L, 2 ), i;
- if (id == I2C_ID_SW) {
- luaL_Buffer b;
- int data;
- if( size == 0 )
- return 0;
- luaL_buffinit( L, &b );
- for( i = 0; i < size; i ++ )
- if( ( data = platform_i2c_recv_byte( id, i < size - 1 ) ) == -1 )
- break;
- else
- luaL_addchar( &b, ( char )data );
- luaL_pushresult( &b );
- return 1;
- } else {
- li2c_hw_master_read( L, id, size );
- return 0;
- }
- }
- static const LUA_REG_TYPE i2c_map[] = {
- { LSTRKEY( "setup" ), LFUNCVAL( i2c_setup ) },
- { LSTRKEY( "start" ), LFUNCVAL( i2c_start ) },
- { LSTRKEY( "stop" ), LFUNCVAL( i2c_stop ) },
- { LSTRKEY( "address" ), LFUNCVAL( i2c_address ) },
- { LSTRKEY( "write" ), LFUNCVAL( i2c_write ) },
- { LSTRKEY( "read" ), LFUNCVAL( i2c_read ) },
- { LSTRKEY( "transfer" ), LFUNCVAL( li2c_hw_master_transfer ) },
- { LSTRKEY( "slave"), LROVAL( li2c_slave_map ) },
- { LSTRKEY( "FASTPLUS" ), LNUMVAL( PLATFORM_I2C_SPEED_FASTPLUS ) },
- { LSTRKEY( "FAST" ), LNUMVAL( PLATFORM_I2C_SPEED_FAST ) },
- { LSTRKEY( "SLOW" ), LNUMVAL( PLATFORM_I2C_SPEED_SLOW ) },
- { LSTRKEY( "TRANSMITTER" ), LNUMVAL( PLATFORM_I2C_DIRECTION_TRANSMITTER ) },
- { LSTRKEY( "RECEIVER" ), LNUMVAL( PLATFORM_I2C_DIRECTION_RECEIVER ) },
- { LSTRKEY( "SW" ), LNUMVAL( I2C_ID_SW ) },
- { LSTRKEY( "HW0" ), LNUMVAL( I2C_ID_HW0 ) },
- { LSTRKEY( "HW1" ), LNUMVAL( I2C_ID_HW1 ) },
- {LNILKEY, LNILVAL}
- };
- int luaopen_i2c( lua_State *L ) {
- li2c_hw_master_init( L );
- li2c_hw_slave_init( L );
- return 0;
- }
- NODEMCU_MODULE(I2C, "i2c", i2c_map, luaopen_i2c);
|