329 lines
8.8 KiB
C
329 lines
8.8 KiB
C
// Module for interfacing with the SPI interface
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#include "module.h"
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#include "lauxlib.h"
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#include "platform.h"
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#define SPI_HALFDUPLEX 0
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#define SPI_FULLDUPLEX 1
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static u8 spi_databits[NUM_SPI] = {0, 0};
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static u8 spi_duplex[NUM_SPI] = {SPI_HALFDUPLEX, SPI_HALFDUPLEX};
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// Lua: = spi.setup( id, mode, cpol, cpha, databits, clock_div, [duplex_mode] )
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static int spi_setup( lua_State *L )
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{
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int id = luaL_checkinteger( L, 1 );
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int mode = luaL_checkinteger( L, 2 );
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int cpol = luaL_checkinteger( L, 3 );
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int cpha = luaL_checkinteger( L, 4 );
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int databits = luaL_checkinteger( L, 5 );
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u32 clock_div = luaL_checkinteger( L, 6 );
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int duplex_mode = luaL_optinteger( L, 7, SPI_HALFDUPLEX );
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MOD_CHECK_ID( spi, id );
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if (mode != PLATFORM_SPI_SLAVE && mode != PLATFORM_SPI_MASTER) {
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return luaL_error( L, "wrong arg type" );
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}
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if (cpol != PLATFORM_SPI_CPOL_LOW && cpol != PLATFORM_SPI_CPOL_HIGH) {
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return luaL_error( L, "wrong arg type" );
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}
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if (cpha != PLATFORM_SPI_CPHA_LOW && cpha != PLATFORM_SPI_CPHA_HIGH) {
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return luaL_error( L, "wrong arg type" );
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}
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if (databits < 0 || databits > 32) {
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return luaL_error( L, "out of range" );
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}
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if (clock_div < 4) {
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// defaulting to 8
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clock_div = 8;
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}
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if (duplex_mode == SPI_HALFDUPLEX || duplex_mode == SPI_FULLDUPLEX)
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{
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spi_duplex[id] = duplex_mode;
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}
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else
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{
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return luaL_error( L, "out of range" );
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}
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spi_databits[id] = databits;
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u32 res = platform_spi_setup(id, mode, cpol, cpha, clock_div);
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lua_pushinteger( L, res );
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return 1;
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}
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// Half-duplex mode:
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// Lua: wrote = spi.send( id, data1, [data2], ..., [datan] )
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// Full-duplex mode:
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// Lua: wrote, [data1], ..., [datan] = spi.send_recv( id, data1, [data2], ..., [datan] )
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// data can be either a string, a table or an 8-bit number
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static int spi_send_recv( lua_State *L )
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{
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unsigned id = luaL_checkinteger( L, 1 );
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const char *pdata;
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size_t datalen, i;
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u32 numdata;
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u32 wrote = 0;
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int pushed = 1;
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unsigned argn, tos;
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u8 recv = spi_duplex[id] == SPI_FULLDUPLEX ? 1 : 0;
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MOD_CHECK_ID( spi, id );
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if( (tos = lua_gettop( L )) < 2 )
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return luaL_error( L, "wrong arg type" );
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// prepare first returned item 'wrote' - value is yet unknown
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// position on stack is tos+1
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lua_pushinteger( L, 0 );
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for( argn = 2; argn <= tos; argn ++ )
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{
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// *** Send integer value and return received data as integer ***
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// lua_isnumber() would silently convert a string of digits to an integer
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// whereas here strings are handled separately.
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if( lua_type( L, argn ) == LUA_TNUMBER )
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{
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numdata = luaL_checkinteger( L, argn );
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if (recv > 0)
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{
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lua_pushinteger( L, platform_spi_send_recv( id, spi_databits[id], numdata ) );
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pushed ++;
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}
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else
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{
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platform_spi_send( id, spi_databits[id], numdata );
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}
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wrote ++;
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}
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// *** Send table elements and return received data items as a table ***
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else if( lua_istable( L, argn ) )
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{
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datalen = lua_objlen( L, argn );
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if (recv > 0 && datalen > 0) {
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// create a table for the received data
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lua_createtable( L, datalen, 0 );
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pushed ++;
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}
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for( i = 0; i < datalen; i ++ )
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{
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lua_rawgeti( L, argn, i + 1 );
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numdata = luaL_checkinteger( L, -1 );
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lua_pop( L, 1 );
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if (recv > 0) {
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lua_pushinteger( L, platform_spi_send_recv( id, spi_databits[id], numdata ) );
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lua_rawseti( L, -2, i + 1 );
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}
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else
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{
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platform_spi_send( id, spi_databits[id], numdata );
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}
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}
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wrote += i;
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if( i < datalen )
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break;
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}
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// *** Send characters of a string and return received data items as string ***
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else
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{
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luaL_Buffer b;
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pdata = luaL_checklstring( L, argn, &datalen );
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if (recv > 0) {
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luaL_buffinit( L, &b );
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}
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for( i = 0; i < datalen; i ++ )
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{
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if (recv > 0)
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{
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luaL_addchar( &b, (char)platform_spi_send_recv( id, spi_databits[id], pdata[ i ] ) );
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}
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else
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{
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platform_spi_send( id, spi_databits[id], pdata[ i ] );
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}
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}
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if (recv > 0 && datalen > 0) {
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luaL_pushresult( &b );
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pushed ++;
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}
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wrote += i;
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if( i < datalen )
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break;
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}
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}
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// update item 'wrote' on stack
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lua_pushinteger( L, wrote );
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lua_replace( L, tos+1 );
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return pushed;
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}
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// Lua: read = spi.recv( id, size, [default data] )
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static int spi_recv( lua_State *L )
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{
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int id = luaL_checkinteger( L, 1 );
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int size = luaL_checkinteger( L, 2 ), i;
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int def = luaL_optinteger( L, 3, 0xffffffff );
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luaL_Buffer b;
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MOD_CHECK_ID( spi, id );
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if (size == 0) {
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return 0;
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}
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luaL_buffinit( L, &b );
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for (i=0; i<size; i++)
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{
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luaL_addchar( &b, ( char )platform_spi_send_recv( id, spi_databits[id], def ) );
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}
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luaL_pushresult( &b );
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return 1;
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}
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// Lua: spi.set_mosi( id, offset, bitlen, data1, [data2], ..., [datan] )
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static int spi_set_mosi( lua_State *L )
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{
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int id = luaL_checkinteger( L, 1 );
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int offset = luaL_checkinteger( L, 2 );
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int bitlen = luaL_checkinteger( L, 3 );
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int argn;
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MOD_CHECK_ID( spi, id );
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if (offset < 0 || offset > 511) {
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return luaL_error( L, "offset out of range" );
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}
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if (bitlen < 1 || bitlen > 32) {
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return luaL_error( L, "bitlen out of range" );
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}
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if (lua_gettop( L ) < 4) {
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return luaL_error( L, "too few args" );
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}
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for (argn = 4; argn <= lua_gettop( L ); argn++, offset += bitlen )
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{
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u32 data = ( u32 )luaL_checkinteger(L, argn );
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if (offset + bitlen > 512) {
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return luaL_error( L, "data range exceeded > 512 bits" );
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}
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if (PLATFORM_OK != platform_spi_set_mosi( id, offset, bitlen, data )) {
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return luaL_error( L, "failed" );
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}
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}
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return 0;
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}
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// Lua: data = spi.get_miso( id, offset, bitlen, num )
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static int spi_get_miso( lua_State *L )
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{
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int id = luaL_checkinteger( L, 1 );
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int offset = luaL_checkinteger( L, 2 );
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int bitlen = luaL_checkinteger( L, 3 );
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int num = luaL_checkinteger( L, 4 ), i;
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MOD_CHECK_ID( spi, id );
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if (offset < 0 || offset > 511) {
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return luaL_error( L, "out of range" );
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}
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if (bitlen < 1 || bitlen > 32) {
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return luaL_error( L, "bitlen out of range" );
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}
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if (offset + bitlen * num > 512) {
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return luaL_error( L, "out of range" );
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}
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for (i = 0; i < num; i++)
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{
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lua_pushinteger( L, platform_spi_get_miso( id, offset + (bitlen * i), bitlen ) );
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}
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return num;
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}
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// Lua: spi.transaction( id, cmd_bitlen, cmd_data, addr_bitlen, addr_data, mosi_bitlen, dummy_bitlen, miso_bitlen )
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static int spi_transaction( lua_State *L )
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{
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int id = luaL_checkinteger( L, 1 );
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int cmd_bitlen = luaL_checkinteger( L, 2 );
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u16 cmd_data = ( u16 )luaL_checkinteger( L, 3 );
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int addr_bitlen = luaL_checkinteger( L, 4 );
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u32 addr_data = ( u32 )luaL_checkinteger( L, 5 );
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int mosi_bitlen = luaL_checkinteger( L, 6 );
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int dummy_bitlen = luaL_checkinteger( L, 7 );
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int miso_bitlen = luaL_checkinteger( L, 8 );
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MOD_CHECK_ID( spi, id );
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if (cmd_bitlen < 0 || cmd_bitlen > 16) {
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return luaL_error( L, "cmd_bitlen out of range" );
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}
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if (addr_bitlen < 0 || addr_bitlen > 32) {
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return luaL_error( L, "addr_bitlen out of range" );
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}
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if (mosi_bitlen < 0 || mosi_bitlen > 512) {
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return luaL_error( L, "mosi_bitlen out of range" );
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}
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if (dummy_bitlen < 0 || dummy_bitlen > 256) {
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return luaL_error( L, "dummy_bitlen out of range" );
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}
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if (miso_bitlen < -512 || miso_bitlen > 512) {
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return luaL_error( L, "miso_bitlen out of range" );
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}
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if (PLATFORM_OK != platform_spi_transaction( id, cmd_bitlen, cmd_data, addr_bitlen, addr_data,
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mosi_bitlen, dummy_bitlen, miso_bitlen) ) {
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return luaL_error( L, "failed" );
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}
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return 0;
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}
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// Module function map
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static const LUA_REG_TYPE spi_map[] = {
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{ LSTRKEY( "setup" ), LFUNCVAL( spi_setup ) },
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{ LSTRKEY( "send" ), LFUNCVAL( spi_send_recv ) },
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{ LSTRKEY( "recv" ), LFUNCVAL( spi_recv ) },
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{ LSTRKEY( "set_mosi" ), LFUNCVAL( spi_set_mosi ) },
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{ LSTRKEY( "get_miso" ), LFUNCVAL( spi_get_miso ) },
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{ LSTRKEY( "transaction" ), LFUNCVAL( spi_transaction ) },
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{ LSTRKEY( "MASTER" ), LNUMVAL( PLATFORM_SPI_MASTER ) },
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{ LSTRKEY( "SLAVE" ), LNUMVAL( PLATFORM_SPI_SLAVE) },
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{ LSTRKEY( "CPHA_LOW" ), LNUMVAL( PLATFORM_SPI_CPHA_LOW) },
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{ LSTRKEY( "CPHA_HIGH" ), LNUMVAL( PLATFORM_SPI_CPHA_HIGH) },
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{ LSTRKEY( "CPOL_LOW" ), LNUMVAL( PLATFORM_SPI_CPOL_LOW) },
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{ LSTRKEY( "CPOL_HIGH" ), LNUMVAL( PLATFORM_SPI_CPOL_HIGH) },
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{ LSTRKEY( "DATABITS_8" ), LNUMVAL( 8 ) },
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{ LSTRKEY( "HALFDUPLEX" ), LNUMVAL( SPI_HALFDUPLEX ) },
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{ LSTRKEY( "FULLDUPLEX" ), LNUMVAL( SPI_FULLDUPLEX ) },
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{ LNILKEY, LNILVAL }
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};
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NODEMCU_MODULE(SPI, "spi", spi_map, NULL);
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