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Support sending strings with multi-byte-wide SPI #3529

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Support sending strings with multi-byte-wide SPI #3529

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10 changes: 9 additions & 1 deletion app/modules/spi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -140,13 +140,21 @@ static int spi_send_recv( lua_State *L )
else
{
luaL_Buffer b;
size_t datachars = spi_databits[id] / 8;

if (spi_databits[id] % 8 != 0) {
return luaL_error( L, "attempt to send string with non-character-divisible databits" );
}
if (datalen % datachars != 0) {
return luaL_error( L, "attempt to send string with non-databits-divisible length" );
}

pdata = luaL_checklstring( L, argn, &datalen );
if (recv > 0) {
luaL_buffinit( L, &b );
}

for( i = 0; i < datalen; i ++ )
for( i = 0; i < datalen; i += datachars )
{
if (recv > 0)
{
Expand Down