280 lines
8.0 KiB
C
280 lines
8.0 KiB
C
#include "module.h"
|
|
#include "lauxlib.h"
|
|
#include "lmem.h"
|
|
#include "platform.h"
|
|
#include "c_stdlib.h"
|
|
#include "c_string.h"
|
|
#include "user_interface.h"
|
|
#include "driver/uart.h"
|
|
|
|
#define CANARY_VALUE 0x32383132
|
|
|
|
typedef struct {
|
|
int canary;
|
|
int size;
|
|
uint8_t colorsPerLed;
|
|
uint8_t values[0];
|
|
} ws2812_buffer;
|
|
|
|
// Init UART1 to be able to stream WS2812 data
|
|
// We use GPIO2 as output pin
|
|
static void ws2812_init() {
|
|
// 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));
|
|
|
|
// 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);
|
|
}
|
|
|
|
|
|
// Stream data using UART1 routed to GPIO2
|
|
// ws2812.init() should be called first
|
|
//
|
|
// NODE_DEBUG should not be activated because it also uses UART1
|
|
static void ICACHE_RAM_ATTR ws2812_write(uint8_t *pixels, uint32_t length) {
|
|
|
|
// 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 };
|
|
|
|
uint8_t *end = pixels + length;
|
|
|
|
do {
|
|
uint8_t value = *pixels++;
|
|
|
|
// Wait enough space in the FIFO buffer
|
|
// (Less than 124 bytes in the buffer)
|
|
while (((READ_PERI_REG(UART_STATUS(1)) >> UART_TXFIFO_CNT_S) & UART_TXFIFO_CNT) > 124);
|
|
|
|
// 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]);
|
|
|
|
} while(pixels < end);
|
|
|
|
}
|
|
|
|
// 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.
|
|
static int ws2812_writegrb(lua_State* L) {
|
|
size_t length;
|
|
const char *values = luaL_checklstring(L, 1, &length);
|
|
|
|
// Send the buffer
|
|
ws2812_write((uint8_t*) values, length);
|
|
|
|
return 0;
|
|
}
|
|
|
|
// 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");
|
|
|
|
// 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;
|
|
|
|
// Store canary for future type checks
|
|
buffer->canary = CANARY_VALUE;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int ws2812_buffer_fill(lua_State* L) {
|
|
ws2812_buffer * buffer = (ws2812_buffer*)lua_touserdata(L, 1);
|
|
|
|
luaL_argcheck(L, buffer && buffer->canary == CANARY_VALUE, 1, "ws2812.buffer expected");
|
|
|
|
// 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*)lua_touserdata(L, 1);
|
|
const int fade = luaL_checkinteger(L, 2);
|
|
|
|
luaL_argcheck(L, buffer && buffer->canary == CANARY_VALUE, 1, "ws2812.buffer expected");
|
|
luaL_argcheck(L, fade > 0, 2, "fade value should be a strict positive number");
|
|
|
|
uint8_t * p = &buffer->values[0];
|
|
int i;
|
|
for(i = 0; i < buffer->size * buffer->colorsPerLed; i++)
|
|
{
|
|
*p++ /= fade;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ws2812_buffer_get(lua_State* L) {
|
|
ws2812_buffer * buffer = (ws2812_buffer*)lua_touserdata(L, 1);
|
|
const int led = luaL_checkinteger(L, 2) - 1;
|
|
|
|
luaL_argcheck(L, buffer && buffer->canary == CANARY_VALUE, 1, "ws2812.buffer expected");
|
|
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*)lua_touserdata(L, 1);
|
|
const int led = luaL_checkinteger(L, 2) - 1;
|
|
|
|
luaL_argcheck(L, buffer && buffer->canary == CANARY_VALUE, 1, "ws2812.buffer expected");
|
|
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*)lua_touserdata(L, 1);
|
|
|
|
luaL_argcheck(L, buffer && buffer->canary == CANARY_VALUE, 1, "ws2812.buffer expected");
|
|
|
|
lua_pushnumber(L, buffer->size);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int ws2812_buffer_write(lua_State* L) {
|
|
ws2812_buffer * buffer = (ws2812_buffer*)lua_touserdata(L, 1);
|
|
|
|
luaL_argcheck(L, buffer && buffer->canary == CANARY_VALUE, 1, "ws2812.buffer expected");
|
|
|
|
// Send the buffer
|
|
ws2812_write(buffer->values, buffer->colorsPerLed*buffer->size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const LUA_REG_TYPE ws2812_buffer_map[] =
|
|
{
|
|
{ LSTRKEY( "fade" ), LFUNCVAL( ws2812_buffer_fade )},
|
|
{ LSTRKEY( "fill" ), LFUNCVAL( ws2812_buffer_fill )},
|
|
{ LSTRKEY( "get" ), LFUNCVAL( ws2812_buffer_get )},
|
|
{ LSTRKEY( "set" ), LFUNCVAL( ws2812_buffer_set )},
|
|
{ LSTRKEY( "size" ), LFUNCVAL( ws2812_buffer_size )},
|
|
{ LSTRKEY( "write" ), LFUNCVAL( ws2812_buffer_write )},
|
|
{ LSTRKEY( "__index" ), LROVAL ( ws2812_buffer_map )},
|
|
{ LNILKEY, LNILVAL}
|
|
};
|
|
|
|
static const LUA_REG_TYPE ws2812_map[] =
|
|
{
|
|
{ LSTRKEY( "write" ), LFUNCVAL( ws2812_writegrb )},
|
|
{ LSTRKEY( "newBuffer" ), LFUNCVAL( ws2812_new_buffer )},
|
|
{ LSTRKEY( "init" ), LFUNCVAL( ws2812_init )},
|
|
{ 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);
|