64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
// Module for interfacing with dac hardware
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#include <string.h>
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#include "module.h"
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#include "lauxlib.h"
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#include "driver/gpio.h"
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#include "driver/dac.h"
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#define GET_CHN(idx) \
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int chn = luaL_checkint( L, idx ); \
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luaL_argcheck( L, chn >= DAC_CHAN_0 && chn <= DAC_CHAN_1, idx, "invalid channel" );
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// Lua: enable( dac_channel )
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static int ldac_enable( lua_State *L )
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{
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GET_CHN(1);
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if (dac_output_enable( chn ) != ESP_OK)
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return luaL_error( L, "dac failed" );
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return 0;
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}
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// Lua: disable( dac_channel )
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static int ldac_disable( lua_State *L )
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{
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GET_CHN(1);
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if (dac_output_disable( chn ) != ESP_OK)
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return luaL_error( L, "dac failed" );
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return 0;
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}
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// Lua: write( dac_channel )
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static int ldac_write( lua_State *L )
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{
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GET_CHN(1);
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int data = luaL_checkint( L, 2 );
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luaL_argcheck( L, data >= 0 && data <= 255, 2, "out of range" );
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if (dac_output_voltage( chn, data ) != ESP_OK)
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return luaL_error( L, "dac failed" );
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return 0;
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}
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// Module function map
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LROT_BEGIN(dac, NULL, 0)
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LROT_FUNCENTRY( enable, ldac_enable )
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LROT_FUNCENTRY( disable, ldac_disable )
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LROT_FUNCENTRY( write, ldac_write )
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LROT_NUMENTRY ( CHANNEL_1, DAC_CHAN_0 )
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LROT_NUMENTRY ( CHANNEL_2, DAC_CHAN_1 )
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LROT_END(dac, NULL, 0)
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NODEMCU_MODULE(DAC, "dac", dac, NULL);
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