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- // Module for interfacing with the I2C interface
- #include "module.h"
- #include "lauxlib.h"
- #include "platform.h"
- // Lua: speed = 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 );
- MOD_CHECK_ID( i2c, id );
- MOD_CHECK_ID( gpio, sda );
- MOD_CHECK_ID( gpio, scl );
- if ( sda == 0 )
- return luaL_error( L, "i2c SDA on D0 is not supported" );
- s32 speed = ( s32 )luaL_checkinteger( L, 4 );
- if ( speed <= 0 )
- return luaL_error( L, "wrong arg range" );
- speed = platform_i2c_setup( id, sda, scl, (u32)speed );
- if ( speed == 0 )
- return luaL_error( L, "failed to initialize i2c %d", id );
- lua_pushinteger( L, speed );
- return 1;
- }
- // Lua: i2c.start( id )
- static int i2c_start( lua_State *L )
- {
- unsigned id = luaL_checkinteger( L, 1 );
- MOD_CHECK_ID( i2c, id );
- if (platform_i2c_configured( id ) )
- platform_i2c_send_start( id );
- else
- luaL_error( L, "i2c %d is not configured", id );
- return 0;
- }
- // Lua: i2c.stop( id )
- static int i2c_stop( lua_State *L )
- {
- unsigned id = luaL_checkinteger( L, 1 );
- MOD_CHECK_ID( i2c, id );
- platform_i2c_send_stop( id );
- return 0;
- }
- // Lua: status = i2c.address( id, address, direction )
- static int i2c_address( lua_State *L )
- {
- unsigned id = luaL_checkinteger( L, 1 );
- int address = luaL_checkinteger( L, 2 );
- int direction = luaL_checkinteger( L, 3 );
- MOD_CHECK_ID( i2c, id );
- if ( address < 0 || address > 127 )
- return luaL_error( L, "wrong arg range" );
- lua_pushboolean( L, platform_i2c_send_address( id, (u16)address, direction ) );
- 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 );
- const char *pdata;
- size_t datalen, i;
- int numdata;
- u32 wrote = 0;
- unsigned argn;
- MOD_CHECK_ID( i2c, id );
- 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( platform_i2c_send_byte( id, numdata ) != 1 )
- break;
- 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( platform_i2c_send_byte( id, numdata ) == 0 )
- break;
- }
- wrote += i;
- if( i < datalen )
- break;
- }
- else
- {
- pdata = luaL_checklstring( L, argn, &datalen );
- for( i = 0; i < datalen; i ++ )
- if( platform_i2c_send_byte( id, pdata[ i ] ) == 0 )
- break;
- 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 );
- u32 size = ( u32 )luaL_checkinteger( L, 2 ), i;
- luaL_Buffer b;
- int data;
- MOD_CHECK_ID( i2c, id );
- 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;
- }
- // Module function map
- LROT_BEGIN(i2c, NULL, 0)
- LROT_FUNCENTRY( setup, i2c_setup )
- LROT_FUNCENTRY( start, i2c_start )
- LROT_FUNCENTRY( stop, i2c_stop )
- LROT_FUNCENTRY( address, i2c_address )
- LROT_FUNCENTRY( write, i2c_write )
- LROT_FUNCENTRY( read, i2c_read )
- LROT_NUMENTRY( FASTPLUS, PLATFORM_I2C_SPEED_FASTPLUS )
- LROT_NUMENTRY( FAST, PLATFORM_I2C_SPEED_FAST )
- LROT_NUMENTRY( SLOW, PLATFORM_I2C_SPEED_SLOW )
- LROT_NUMENTRY( TRANSMITTER, PLATFORM_I2C_DIRECTION_TRANSMITTER )
- LROT_NUMENTRY( RECEIVER, PLATFORM_I2C_DIRECTION_RECEIVER )
- LROT_END(i2c, NULL, 0)
- NODEMCU_MODULE(I2C, "i2c", i2c, NULL);
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