89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
#include "lualib.h"
|
|
#include "lauxlib.h"
|
|
#include "platform.h"
|
|
#include "auxmods.h"
|
|
#include "lrotable.h"
|
|
/**
|
|
* All this code is mostly from http://www.esp8266.com/viewtopic.php?f=21&t=1143&sid=a620a377672cfe9f666d672398415fcb
|
|
* from user Markus Gritsch.
|
|
* I just put this code into its own module and pushed into a forked repo,
|
|
* to easily create a pull request. Thanks to Markus Gritsch for the code.
|
|
*/
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// -- This WS2812 code must be compiled with -O2 to get the timing right. Read this:
|
|
// -- http://wp.josh.com/2014/05/13/ws2812-neopixels-are-not-so-finicky-once-you-get-to-know-them/
|
|
// -- The ICACHE_FLASH_ATTR is there to trick the compiler and get the very first pulse width correct.
|
|
static void ICACHE_FLASH_ATTR send_ws_0(uint8_t gpio) {
|
|
uint8_t i;
|
|
i = 4; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, 1 << gpio);
|
|
i = 9; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, 1 << gpio);
|
|
}
|
|
|
|
static void ICACHE_FLASH_ATTR send_ws_1(uint8_t gpio) {
|
|
uint8_t i;
|
|
i = 8; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, 1 << gpio);
|
|
i = 6; while (i--) GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, 1 << gpio);
|
|
}
|
|
|
|
// Lua: ws2812.write(pin, "string")
|
|
// Byte triples in the string are interpreted as R G B values and sent to the hardware as G R B.
|
|
// ws2812.write(4, string.char(255, 0, 0)) uses GPIO2 and sets the first LED red.
|
|
// ws2812.write(3, string.char(0, 0, 255):rep(10)) uses GPIO0 and sets ten LEDs blue.
|
|
// ws2812.write(4, string.char(0, 255, 0, 255, 255, 255)) first LED green, second LED white.
|
|
static int ICACHE_FLASH_ATTR ws2812_writergb(lua_State* L)
|
|
{
|
|
const uint8_t pin = luaL_checkinteger(L, 1);
|
|
size_t length;
|
|
char *buffer = (char *)luaL_checklstring(L, 2, &length); // Cast away the constness.
|
|
|
|
// Initialize the output pin:
|
|
platform_gpio_mode(pin, PLATFORM_GPIO_OUTPUT, PLATFORM_GPIO_FLOAT);
|
|
platform_gpio_write(pin, 0);
|
|
|
|
// Ignore incomplete Byte triples at the end of buffer:
|
|
length -= length % 3;
|
|
|
|
// Rearrange R G B values to G R B order needed by WS2812 LEDs:
|
|
size_t i;
|
|
for (i = 0; i < length; i += 3) {
|
|
const char r = buffer[i];
|
|
const char g = buffer[i + 1];
|
|
buffer[i] = g;
|
|
buffer[i + 1] = r;
|
|
}
|
|
|
|
// Do not remove these:
|
|
os_delay_us(1);
|
|
os_delay_us(1);
|
|
|
|
// Send the buffer:
|
|
os_intr_lock();
|
|
const char * const end = buffer + length;
|
|
while (buffer != end) {
|
|
uint8_t mask = 0x80;
|
|
while (mask) {
|
|
(*buffer & mask) ? send_ws_1(pin_num[pin]) : send_ws_0(pin_num[pin]);
|
|
mask >>= 1;
|
|
}
|
|
++buffer;
|
|
}
|
|
os_intr_unlock();
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define MIN_OPT_LEVEL 2
|
|
#include "lrodefs.h"
|
|
const LUA_REG_TYPE ws2812_map[] =
|
|
{
|
|
{ LSTRKEY( "writergb" ), LFUNCVAL( ws2812_writergb )},
|
|
{ LNILKEY, LNILVAL}
|
|
};
|
|
|
|
LUALIB_API int luaopen_ws2812(lua_State *L) {
|
|
// TODO: Make sure that the GPIO system is initialized
|
|
LREGISTER(L, "ws2812", ws2812_map);
|
|
return 1;
|
|
}
|