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- #include "module.h"
- #include "lauxlib.h"
- #include "lmem.h"
- #include "platform.h"
- #include "c_stdlib.h"
- #include "c_math.h"
- #include "c_string.h"
- #include "user_interface.h"
- #include "driver/uart.h"
- #include "osapi.h"
- #include "ws2812.h"
- #define CANARY_VALUE 0x32383132
- #define MODE_SINGLE 0
- #define MODE_DUAL 1
- // Init UART1 to be able to stream WS2812 data to GPIO2 pin
- // If DUAL mode is selected, init UART0 to stream to TXD0 as well
- // You HAVE to redirect LUA's output somewhere else
- static int ws2812_init(lua_State* L) {
- const int mode = luaL_optinteger(L, 1, MODE_SINGLE);
- luaL_argcheck(L, mode == MODE_SINGLE || mode == MODE_DUAL, 1, "ws2812.SINGLE or ws2812.DUAL expected");
- // Configure UART1
- // Set baudrate of UART1 to 3200000
- WRITE_PERI_REG(UART_CLKDIV(1), UART_CLK_FREQ / 3200000);
- // Set UART Configuration No parity / 6 DataBits / 1 StopBits / Invert TX
- WRITE_PERI_REG(UART_CONF0(1), UART_TXD_INV | (1 << UART_STOP_BIT_NUM_S) | (1 << UART_BIT_NUM_S));
- if (mode == MODE_DUAL) {
- // Configure UART0
- // Set baudrate of UART0 to 3200000
- WRITE_PERI_REG(UART_CLKDIV(0), UART_CLK_FREQ / 3200000);
- // Set UART Configuration No parity / 6 DataBits / 1 StopBits / Invert TX
- WRITE_PERI_REG(UART_CONF0(0), UART_TXD_INV | (1 << UART_STOP_BIT_NUM_S) | (1 << UART_BIT_NUM_S));
- }
- // Pull GPIO2 down
- platform_gpio_mode(4, PLATFORM_GPIO_OUTPUT, PLATFORM_GPIO_FLOAT);
- platform_gpio_write(4, 0);
- // Waits 10us to simulate a reset
- os_delay_us(10);
- // Redirect UART1 to GPIO2
- // Disable GPIO2
- GPIO_REG_WRITE(GPIO_ENABLE_W1TC_ADDRESS, BIT2);
- // Enable Function 2 for GPIO2 (U1TXD)
- PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO2_U, FUNC_U1TXD_BK);
- return 0;
- }
- // Stream data using UART1 routed to GPIO2
- // ws2812.init() should be called first
- //
- // NODE_DEBUG should not be activated because it also uses UART1
- void ICACHE_RAM_ATTR ws2812_write_data(const uint8_t *pixels, uint32_t length, const uint8_t *pixels2, uint32_t length2) {
- // Data are sent LSB first, with a start bit at 0, an end bit at 1 and all inverted
- // 0b00110111 => 110111 => [0]111011[1] => 10001000 => 00
- // 0b00000111 => 000111 => [0]111000[1] => 10001110 => 01
- // 0b00110100 => 110100 => [0]001011[1] => 11101000 => 10
- // 0b00000100 => 000100 => [0]001000[1] => 11101110 => 11
- // Array declared as static const to avoid runtime generation
- // But declared in ".data" section to avoid read penalty from FLASH
- static const __attribute__((section(".data._uartData"))) uint8_t _uartData[4] = { 0b00110111, 0b00000111, 0b00110100, 0b00000100 };
- const uint8_t *end = pixels + length;
- const uint8_t *end2 = pixels2 + length2;
- do {
- // If something to send for first buffer and enough room
- // in FIFO buffer (we wants to write 4 bytes, so less than
- // 124 in the buffer)
- if (pixels < end && (((READ_PERI_REG(UART_STATUS(1)) >> UART_TXFIFO_CNT_S) & UART_TXFIFO_CNT) <= 124)) {
- uint8_t value = *pixels++;
- // Fill the buffer
- WRITE_PERI_REG(UART_FIFO(1), _uartData[(value >> 6) & 3]);
- WRITE_PERI_REG(UART_FIFO(1), _uartData[(value >> 4) & 3]);
- WRITE_PERI_REG(UART_FIFO(1), _uartData[(value >> 2) & 3]);
- WRITE_PERI_REG(UART_FIFO(1), _uartData[(value >> 0) & 3]);
- }
- // Same for the second buffer
- if (pixels2 < end2 && (((READ_PERI_REG(UART_STATUS(0)) >> UART_TXFIFO_CNT_S) & UART_TXFIFO_CNT) <= 124)) {
- uint8_t value = *pixels2++;
- // Fill the buffer
- WRITE_PERI_REG(UART_FIFO(0), _uartData[(value >> 6) & 3]);
- WRITE_PERI_REG(UART_FIFO(0), _uartData[(value >> 4) & 3]);
- WRITE_PERI_REG(UART_FIFO(0), _uartData[(value >> 2) & 3]);
- WRITE_PERI_REG(UART_FIFO(0), _uartData[(value >> 0) & 3]);
- }
- } while(pixels < end || pixels2 < end2); // Until there is still something to send
- }
- // Lua: ws2812.write("string")
- // Byte triples in the string are interpreted as G R B values.
- //
- // ws2812.init() should be called first
- //
- // ws2812.write(string.char(0, 255, 0)) sets the first LED red.
- // ws2812.write(string.char(0, 0, 255):rep(10)) sets ten LEDs blue.
- // ws2812.write(string.char(255, 0, 0, 255, 255, 255)) first LED green, second LED white.
- //
- // In DUAL mode 'ws2812.init(ws2812.DUAL)', you may pass a second string as parameter
- // It will be sent through TXD0 in parallel
- static int ws2812_write(lua_State* L) {
- size_t length1, length2;
- const char *buffer1, *buffer2;
- // First mandatory parameter
- int type = lua_type(L, 1);
- if (type == LUA_TNIL)
- {
- buffer1 = 0;
- length1 = 0;
- }
- else if(type == LUA_TSTRING)
- {
- buffer1 = lua_tolstring(L, 1, &length1);
- }
- else if (type == LUA_TUSERDATA)
- {
- ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
- buffer1 = buffer->values;
- length1 = buffer->colorsPerLed*buffer->size;
- }
- else
- {
- luaL_argerror(L, 1, "ws2812.buffer or string expected");
- }
- // Second optionnal parameter
- type = lua_type(L, 2);
- if (type == LUA_TNONE || type == LUA_TNIL)
- {
- buffer2 = 0;
- length2 = 0;
- }
- else if (type == LUA_TSTRING)
- {
- buffer2 = lua_tolstring(L, 2, &length2);
- }
- else if (type == LUA_TUSERDATA)
- {
- ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 2, "ws2812.buffer");
- buffer2 = buffer->values;
- length2 = buffer->colorsPerLed*buffer->size;
- }
- else
- {
- luaL_argerror(L, 2, "ws2812.buffer or string expected");
- }
- // Send the buffers
- ws2812_write_data(buffer1, length1, buffer2, length2);
- 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);
- c_memset(buffer->values, 0, colorsPerLed * leds);
- return 1;
- }
- int ws2812_buffer_fill(ws2812_buffer * buffer, int * colors) {
- // Grab colors
- int i, j;
- // 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];
- }
- }
- return 0;
- }
- static int ws2812_buffer_fill_lua(lua_State* L) {
- ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
- // Grab colors
- int i;
- int * colors = luaM_malloc(L, buffer->colorsPerLed * sizeof(int));
- for (i = 0; i < buffer->colorsPerLed; i++)
- {
- colors[i] = luaL_checkinteger(L, 2+i);
- }
- ws2812_buffer_fill(buffer, colors);
- // 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;
- }
- int ws2812_buffer_shift(ws2812_buffer * buffer, int shiftValue, unsigned shift_type, int pos_start, int pos_end) {
- ptrdiff_t start = posrelat(pos_start, buffer->size);
- ptrdiff_t end = posrelat(pos_end, 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 = c_malloc(buffer->colorsPerLed * sizeof(uint8_t) * shift);
- int i,j;
- 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)
- c_memcpy(tmp_pixels, &buffer->values[offset + (size-shift)*buffer->colorsPerLed], shift_len);
- // Move pixels to end
- os_memmove(&buffer->values[offset + shift*buffer->colorsPerLed], &buffer->values[offset], remaining_len);
- // Fill beginning with temp data
- if (shift_type == SHIFT_LOGICAL)
- {
- c_memset(&buffer->values[offset], 0, shift_len);
- }
- else
- {
- c_memcpy(&buffer->values[offset], tmp_pixels, shift_len);
- }
- }
- else
- {
- // Store the values which are moved out of the array (last n pixels)
- c_memcpy(tmp_pixels, &buffer->values[offset], shift_len);
- // Move pixels to end
- os_memmove(&buffer->values[offset], &buffer->values[offset + shift*buffer->colorsPerLed], remaining_len);
- // Fill beginning with temp data
- if (shift_type == SHIFT_LOGICAL)
- {
- c_memset(&buffer->values[offset + (size-shift)*buffer->colorsPerLed], 0, shift_len);
- }
- else
- {
- c_memcpy(&buffer->values[offset + (size-shift)*buffer->colorsPerLed], tmp_pixels, shift_len);
- }
- }
- // Free memory
- c_free(tmp_pixels);
- return 0;
- }
- static int ws2812_buffer_shift_lua(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 );
- const int pos_start = luaL_optinteger(L, 4, 1);
- const int pos_end = luaL_optinteger(L, 5, -1);
- ws2812_buffer_shift(buffer, shiftValue, shift_type, pos_start, pos_end);
- return 0;
- }
- static int ws2812_buffer_dump(lua_State* L) {
- ws2812_buffer * buffer = (ws2812_buffer*)luaL_checkudata(L, 1, "ws2812.buffer");
- lua_pushlstring(L, 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");
- c_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++) {
- int32_t val = 0;
- for (src = 0; src < n_sources; src++) {
- val += (int32_t)(source[src].values[i] * source[src].factor);
- }
- val >>= 8;
- if (val < 0) {
- val = 0;
- } else if (val > 255) {
- val = 255;
- }
- buffer->values[i] = (uint8_t)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");
- }
- c_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);
- c_memcpy(result->values, lhs->values + lhs->colorsPerLed * (start - 1), lhs->colorsPerLed * (end - start + 1));
- } else {
- ws2812_buffer *result = allocate_buffer(L, 0, lhs->colorsPerLed);
- }
- 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);
- c_memcpy(buffer->values, lhs->values, lhs->colorsPerLed * lhs->size);
- c_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];
- c_sprintf(numbuf, "%d", buffer->values[p]);
- luaL_addstring(&result, numbuf);
- }
- luaL_addchar(&result, ')');
- }
- luaL_addchar(&result, ']');
- luaL_pushresult(&result);
- return 1;
- }
- static const LUA_REG_TYPE ws2812_buffer_map[] =
- {
- { LSTRKEY( "dump" ), LFUNCVAL( ws2812_buffer_dump )},
- { LSTRKEY( "fade" ), LFUNCVAL( ws2812_buffer_fade )},
- { LSTRKEY( "fill" ), LFUNCVAL( ws2812_buffer_fill_lua )},
- { LSTRKEY( "get" ), LFUNCVAL( ws2812_buffer_get )},
- { LSTRKEY( "replace" ), LFUNCVAL( ws2812_buffer_replace )},
- { LSTRKEY( "mix" ), LFUNCVAL( ws2812_buffer_mix )},
- { LSTRKEY( "power" ), LFUNCVAL( ws2812_buffer_power )},
- { LSTRKEY( "set" ), LFUNCVAL( ws2812_buffer_set )},
- { LSTRKEY( "shift" ), LFUNCVAL( ws2812_buffer_shift_lua )},
- { LSTRKEY( "size" ), LFUNCVAL( ws2812_buffer_size )},
- { LSTRKEY( "sub" ), LFUNCVAL( ws2812_buffer_sub )},
- { LSTRKEY( "__concat" ),LFUNCVAL( ws2812_buffer_concat )},
- { LSTRKEY( "__index" ), LROVAL( ws2812_buffer_map )},
- { LSTRKEY( "__tostring" ), LFUNCVAL( ws2812_buffer_tostring )},
- { LNILKEY, LNILVAL}
- };
- static const LUA_REG_TYPE ws2812_map[] =
- {
- { LSTRKEY( "init" ), LFUNCVAL( ws2812_init )},
- { LSTRKEY( "newBuffer" ), LFUNCVAL( ws2812_new_buffer )},
- { LSTRKEY( "write" ), LFUNCVAL( ws2812_write )},
- { LSTRKEY( "FADE_IN" ), LNUMVAL( FADE_IN ) },
- { LSTRKEY( "FADE_OUT" ), LNUMVAL( FADE_OUT ) },
- { LSTRKEY( "MODE_SINGLE" ), LNUMVAL( MODE_SINGLE ) },
- { LSTRKEY( "MODE_DUAL" ), LNUMVAL( MODE_DUAL ) },
- { LSTRKEY( "SHIFT_LOGICAL" ), LNUMVAL( SHIFT_LOGICAL ) },
- { LSTRKEY( "SHIFT_CIRCULAR" ), LNUMVAL( SHIFT_CIRCULAR ) },
- { LNILKEY, LNILVAL}
- };
- 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_map, luaopen_ws2812);
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