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nodemcu-firmware/components/modules/ws2812.c

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#include "module.h"
#include "lauxlib.h"
#include "lmem.h"
#include "platform.h"
#include <string.h>
#define FADE_IN 1
#define FADE_OUT 0
#define SHIFT_LOGICAL 0
#define SHIFT_CIRCULAR 1
typedef struct {
int size;
uint8_t colorsPerLed;
uint8_t values[0];
} ws2812_buffer;
static void ws2812_cleanup( lua_State *L, int pop )
{
if (pop)
lua_pop( L, pop );
platform_ws2812_release();
}
// Lua: ws2812.write("string")
// Byte triples in the string are interpreted as G R B values.
//
// ws2812.write({pin = 4, data = string.char(0, 255, 0)}) sets the first LED red.
// ws2812.write({pin = 4, data = string.char(0, 0, 255):rep(10)}) sets ten LEDs blue.
// ws2812.write({pin = 4, data = string.char(255, 0, 0, 255, 255, 255)}) first LED green, second LED white.
static int ws2812_write( lua_State* L )
{
int top = lua_gettop( L );
for (int stack = 1; stack <= top; stack++) {
if (lua_type( L, stack ) == LUA_TNIL)
continue;
if (lua_type( L, stack ) != LUA_TTABLE) {
ws2812_cleanup( L, 0 );
luaL_checktype( L, stack, LUA_TTABLE ); // trigger error
return 0;
}
//
// retrieve pin
//
lua_getfield( L, stack, "pin" );
if (!lua_isnumber( L, -1 )) {
ws2812_cleanup( L, 1 );
return luaL_argerror( L, stack, "invalid pin" );
}
int gpio_num = luaL_checkint( L, -1 );
lua_pop( L, 1 );
//
// retrieve data
//
lua_getfield( L, stack, "data" );
const char *data;
size_t length;
int type = lua_type( L, -1 );
if (type == LUA_TSTRING)
{
data = lua_tolstring( L, -1, &length );
}
else if (type == LUA_TUSERDATA)
{
ws2812_buffer *buffer = (ws2812_buffer*)luaL_checkudata( L, -1, "ws2812.buffer" );
data = (const char *)buffer->values;
length = buffer->colorsPerLed*buffer->size;
}
else
{
ws2812_cleanup( L, 1 );
return luaL_argerror(L, stack, "ws2812.buffer or string expected");
}
lua_pop( L, 1 );
// prepare channel
if (platform_ws2812_setup( gpio_num, 1, (const uint8_t *)data, length ) != PLATFORM_OK) {
ws2812_cleanup( L, 0 );
return luaL_argerror( L, stack, "can't set up chain" );
}
}
//
// send all channels at once
//
if (platform_ws2812_send() != PLATFORM_OK) {
ws2812_cleanup( L, 0 );
return luaL_error( L, "sending failed" );
}
ws2812_cleanup( L, 0 );
return 0;
}
static ptrdiff_t posrelat (ptrdiff_t pos, size_t len) {
/* relative string position: negative means back from end */
if (pos < 0) pos += (ptrdiff_t)len + 1;
return (pos >= 0) ? pos : 0;
}
static ws2812_buffer *allocate_buffer(lua_State *L, int leds, int colorsPerLed) {
// Allocate memory
size_t size = sizeof(ws2812_buffer) + colorsPerLed*leds*sizeof(uint8_t);
ws2812_buffer * buffer = (ws2812_buffer*)lua_newuserdata(L, size);
// Associate its metatable
luaL_getmetatable(L, "ws2812.buffer");
lua_setmetatable(L, -2);
// Save led strip size
buffer->size = leds;
buffer->colorsPerLed = colorsPerLed;
return buffer;
}
// Handle a buffer where we can store led values
static int ws2812_new_buffer(lua_State *L) {
const int leds = luaL_checkint(L, 1);
const int colorsPerLed = luaL_checkint(L, 2);
luaL_argcheck(L, leds > 0, 1, "should be a positive integer");
luaL_argcheck(L, colorsPerLed > 0, 2, "should be a positive integer");
ws2812_buffer * buffer = allocate_buffer(L, leds, colorsPerLed);
memset(buffer->values, 0, colorsPerLed * leds);
return 1;
}
static int ws2812_buffer_fill(lua_State* L) {
ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
// Grab colors
int i, j;
int * colors = luaM_malloc(L, buffer->colorsPerLed * sizeof(int));
for (i = 0; i < buffer->colorsPerLed; i++)
{
colors[i] = luaL_checkinteger(L, 2+i);
}
// Fill buffer
uint8_t * p = &buffer->values[0];
for(i = 0; i < buffer->size; i++)
{
for (j = 0; j < buffer->colorsPerLed; j++)
{
*p++ = colors[j];
}
}
// Free memory
luaM_free(L, colors);
return 0;
}
static int ws2812_buffer_fade(lua_State* L) {
ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
const int fade = luaL_checkinteger(L, 2);
unsigned direction = luaL_optinteger( L, 3, FADE_OUT );
luaL_argcheck(L, fade > 0, 2, "fade value should be a strict positive number");
uint8_t * p = &buffer->values[0];
int val = 0;
int i;
for(i = 0; i < buffer->size * buffer->colorsPerLed; i++)
{
if (direction == FADE_OUT)
{
*p++ /= fade;
}
else
{
// as fade in can result in value overflow, an int is used to perform the check afterwards
val = *p * fade;
if (val > 255) val = 255;
*p++ = val;
}
}
return 0;
}
static int ws2812_buffer_shift(lua_State* L) {
ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
const int shiftValue = luaL_checkinteger(L, 2);
const unsigned shift_type = luaL_optinteger( L, 3, SHIFT_LOGICAL );
ptrdiff_t start = posrelat(luaL_optinteger(L, 4, 1), buffer->size);
ptrdiff_t end = posrelat(luaL_optinteger(L, 5, -1), buffer->size);
if (start < 1) start = 1;
if (end > (ptrdiff_t)buffer->size) end = (ptrdiff_t)buffer->size;
start--;
int size = end - start;
size_t offset = start * buffer->colorsPerLed;
luaL_argcheck(L, shiftValue > 0-size && shiftValue < size, 2, "shifting more elements than buffer size");
int shift = shiftValue >= 0 ? shiftValue : -shiftValue;
// check if we want to shift at all
if (shift == 0 || size <= 0)
{
return 0;
}
uint8_t * tmp_pixels = luaM_malloc(L, buffer->colorsPerLed * sizeof(uint8_t) * shift);
size_t shift_len, remaining_len;
// calculate length of shift section and remaining section
shift_len = shift*buffer->colorsPerLed;
remaining_len = (size-shift)*buffer->colorsPerLed;
if (shiftValue > 0)
{
// Store the values which are moved out of the array (last n pixels)
memcpy(tmp_pixels, &buffer->values[offset + (size-shift)*buffer->colorsPerLed], shift_len);
// Move pixels to end
memmove(&buffer->values[offset + shift*buffer->colorsPerLed], &buffer->values[offset], remaining_len);
// Fill beginning with temp data
if (shift_type == SHIFT_LOGICAL)
{
memset(&buffer->values[offset], 0, shift_len);
}
else
{
memcpy(&buffer->values[offset], tmp_pixels, shift_len);
}
}
else
{
// Store the values which are moved out of the array (last n pixels)
memcpy(tmp_pixels, &buffer->values[offset], shift_len);
// Move pixels to end
memmove(&buffer->values[offset], &buffer->values[offset + shift*buffer->colorsPerLed], remaining_len);
// Fill beginning with temp data
if (shift_type == SHIFT_LOGICAL)
{
memset(&buffer->values[offset + (size-shift)*buffer->colorsPerLed], 0, shift_len);
}
else
{
memcpy(&buffer->values[offset + (size-shift)*buffer->colorsPerLed], tmp_pixels, shift_len);
}
}
// Free memory
luaM_free(L, tmp_pixels);
return 0;
}
static int ws2812_buffer_dump(lua_State* L) {
ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
lua_pushlstring(L, (char *)buffer->values, buffer->size * buffer->colorsPerLed);
return 1;
}
static int ws2812_buffer_replace(lua_State* L) {
ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
size_t l = buffer->size;
ptrdiff_t start = posrelat(luaL_optinteger(L, 3, 1), l);
uint8_t *src;
size_t srcLen;
if (lua_type(L, 2) == LUA_TSTRING) {
size_t length;
src = (uint8_t *) lua_tolstring(L, 2, &length);
srcLen = length / buffer->colorsPerLed;
} else {
ws2812_buffer * rhs = (ws2812_buffer*)luaL_checkudata(L, 2, "ws2812.buffer");
src = rhs->values;
srcLen = rhs->size;
luaL_argcheck(L, rhs->colorsPerLed == buffer->colorsPerLed, 2, "Buffers have different colors");
}
luaL_argcheck(L, srcLen + start - 1 <= buffer->size, 2, "Does not fit into destination");
memcpy(buffer->values + (start - 1) * buffer->colorsPerLed, src, srcLen * buffer->colorsPerLed);
return 0;
}
// buffer:mix(factor1, buffer1, ..)
// factor is 256 for 100%
// uses saturating arithmetic (one buffer at a time)
static int ws2812_buffer_mix(lua_State* L) {
ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
int pos = 2;
size_t cells = buffer->size * buffer->colorsPerLed;
int n_sources = (lua_gettop(L) - 1) / 2;
struct {
int factor;
const uint8_t *values;
} source[n_sources];
int src;
for (src = 0; src < n_sources; src++, pos += 2) {
int factor = luaL_checkinteger(L, pos);
ws2812_buffer *src_buffer = (ws2812_buffer*) luaL_checkudata(L, pos + 1, "ws2812.buffer");
luaL_argcheck(L, src_buffer->size == buffer->size && src_buffer->colorsPerLed == buffer->colorsPerLed, pos + 1, "Buffer not same shape");
source[src].factor = factor;
source[src].values = src_buffer->values;
}
size_t i;
for (i = 0; i < cells; i++) {
int val = 0;
for (src = 0; src < n_sources; src++) {
val += ((int)(source[src].values[i] * source[src].factor) >> 8);
}
if (val < 0) {
val = 0;
} else if (val > 255) {
val = 255;
}
buffer->values[i] = val;
}
return 0;
}
// Returns the total of all channels
static int ws2812_buffer_power(lua_State* L) {
ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
size_t cells = buffer->size * buffer->colorsPerLed;
size_t i;
int total = 0;
for (i = 0; i < cells; i++) {
total += buffer->values[i];
}
lua_pushnumber(L, total);
return 1;
}
static int ws2812_buffer_get(lua_State* L) {
ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
const int led = luaL_checkinteger(L, 2) - 1;
luaL_argcheck(L, led >= 0 && led < buffer->size, 2, "index out of range");
int i;
for (i = 0; i < buffer->colorsPerLed; i++)
{
lua_pushnumber(L, buffer->values[buffer->colorsPerLed*led+i]);
}
return buffer->colorsPerLed;
}
static int ws2812_buffer_set(lua_State* L) {
ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
const int led = luaL_checkinteger(L, 2) - 1;
luaL_argcheck(L, led >= 0 && led < buffer->size, 2, "index out of range");
int type = lua_type(L, 3);
if(type == LUA_TTABLE)
{
int i;
for (i = 0; i < buffer->colorsPerLed; i++)
{
// Get value and push it on stack
lua_rawgeti(L, 3, i+1);
// Convert it as int and store them in buffer
buffer->values[buffer->colorsPerLed*led+i] = lua_tonumber(L, -1);
}
// Clean up the stack
lua_pop(L, buffer->colorsPerLed);
}
else if(type == LUA_TSTRING)
{
size_t len;
const char * buf = lua_tolstring(L, 3, &len);
// Overflow check
if( buffer->colorsPerLed*led + len > buffer->colorsPerLed*buffer->size )
{
return luaL_error(L, "string size will exceed strip length");
}
memcpy(&buffer->values[buffer->colorsPerLed*led], buf, len);
}
else
{
int i;
for (i = 0; i < buffer->colorsPerLed; i++)
{
buffer->values[buffer->colorsPerLed*led+i] = luaL_checkinteger(L, 3+i);
}
}
return 0;
}
static int ws2812_buffer_size(lua_State* L) {
ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
lua_pushnumber(L, buffer->size);
return 1;
}
static int ws2812_buffer_sub(lua_State* L) {
ws2812_buffer * lhs = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
size_t l = lhs->size;
ptrdiff_t start = posrelat(luaL_checkinteger(L, 2), l);
ptrdiff_t end = posrelat(luaL_optinteger(L, 3, -1), l);
if (start < 1) start = 1;
if (end > (ptrdiff_t)l) end = (ptrdiff_t)l;
if (start <= end) {
ws2812_buffer *result = allocate_buffer(L, end - start + 1, lhs->colorsPerLed);
memcpy(result->values, lhs->values + lhs->colorsPerLed * (start - 1), lhs->colorsPerLed * (end - start + 1));
} else {
ws2812_buffer *result = allocate_buffer(L, 0, lhs->colorsPerLed);
(void)result;
}
return 1;
}
static int ws2812_buffer_concat(lua_State* L) {
ws2812_buffer * lhs = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
ws2812_buffer * rhs = (ws2812_buffer*)luaL_checkudata(L, 2, "ws2812.buffer");
luaL_argcheck(L, lhs->colorsPerLed == rhs->colorsPerLed, 1, "Can only concatenate buffers with same colors");
int colorsPerLed = lhs->colorsPerLed;
int leds = lhs->size + rhs->size;
ws2812_buffer * buffer = allocate_buffer(L, leds, colorsPerLed);
memcpy(buffer->values, lhs->values, lhs->colorsPerLed * lhs->size);
memcpy(buffer->values + lhs->colorsPerLed * lhs->size, rhs->values, rhs->colorsPerLed * rhs->size);
return 1;
}
static int ws2812_buffer_tostring(lua_State* L) {
ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
luaL_Buffer result;
luaL_buffinit(L, &result);
luaL_addchar(&result, '[');
int i;
int p = 0;
for (i = 0; i < buffer->size; i++) {
int j;
if (i > 0) {
luaL_addchar(&result, ',');
}
luaL_addchar(&result, '(');
for (j = 0; j < buffer->colorsPerLed; j++, p++) {
if (j > 0) {
luaL_addchar(&result, ',');
}
char numbuf[5];
sprintf(numbuf, "%d", buffer->values[p]);
luaL_addstring(&result, numbuf);
}
luaL_addchar(&result, ')');
}
luaL_addchar(&result, ']');
luaL_pushresult(&result);
return 1;
}
LROT_BEGIN(ws2812_buffer)
LROT_FUNCENTRY( dump, ws2812_buffer_dump )
LROT_FUNCENTRY( fade, ws2812_buffer_fade )
LROT_FUNCENTRY( fill, ws2812_buffer_fill )
LROT_FUNCENTRY( get, ws2812_buffer_get )
LROT_FUNCENTRY( replace, ws2812_buffer_replace )
LROT_FUNCENTRY( mix, ws2812_buffer_mix )
LROT_FUNCENTRY( power, ws2812_buffer_power )
LROT_FUNCENTRY( set, ws2812_buffer_set )
LROT_FUNCENTRY( shift, ws2812_buffer_shift )
LROT_FUNCENTRY( size, ws2812_buffer_size )
LROT_FUNCENTRY( sub, ws2812_buffer_sub )
LROT_FUNCENTRY( __concat, ws2812_buffer_concat )
LROT_TABENTRY ( __index, ws2812_buffer )
LROT_FUNCENTRY( __tostring, ws2812_buffer_tostring )
LROT_END(ws2812_buffer, NULL, 0)
LROT_BEGIN(ws2812)
LROT_FUNCENTRY( newBuffer, ws2812_new_buffer )
LROT_FUNCENTRY( write, ws2812_write )
LROT_NUMENTRY ( FADE_IN, FADE_IN )
LROT_NUMENTRY ( FADE_OUT, FADE_OUT )
LROT_NUMENTRY ( SHIFT_LOGICAL, SHIFT_LOGICAL )
LROT_NUMENTRY ( SHIFT_CIRCULAR, SHIFT_CIRCULAR )
LROT_END(ws2812, NULL, 0)
int luaopen_ws2812(lua_State *L) {
// TODO: Make sure that the GPIO system is initialized
luaL_rometatable(L, "ws2812.buffer", (void *)ws2812_buffer_map); // create metatable for ws2812.buffer
return 0;
}
NODEMCU_MODULE(WS2812, "ws2812", ws2812, luaopen_ws2812);
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