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- #include "module.h"
- #include "lauxlib.h"
- #include "platform.h"
- #include "c_stdlib.h"
- #include "c_string.h"
- /**
- * Code is based on https://github.com/CHERTS/esp8266-devkit/blob/master/Espressif/examples/EspLightNode/user/ws2801.c
- * and provides a similar api as the ws2812 module.
- * The current implementation allows the caller to use
- * any combination of GPIO0, GPIO2, GPIO4, GPIO5 as clock and data.
- */
- #define PIN_CLK_DEFAULT 0
- #define PIN_DATA_DEFAULT 2
- static uint32_t ws2801_bit_clk;
- static uint32_t ws2801_bit_data;
- static void ws2801_byte(uint8_t n) {
- uint8_t bitmask;
- for (bitmask = 0x80; bitmask !=0 ; bitmask >>= 1) {
- if (n & bitmask) {
- GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, ws2801_bit_data);
- } else {
- GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, ws2801_bit_data);
- }
- GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, ws2801_bit_clk);
- GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, ws2801_bit_clk);
- }
- }
- static void ws2801_color(uint8_t r, uint8_t g, uint8_t b) {
- ws2801_byte(r);
- ws2801_byte(g);
- ws2801_byte(b);
- }
- static void ws2801_strip(uint8_t const * data, uint16_t len) {
- while (len--) {
- ws2801_byte(*(data++));
- }
- GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, ws2801_bit_data);
- }
- static void enable_pin_mux(int pin) {
- // The API only supports setting PERIPHS_IO_MUX on GPIO 0, 2, 4, 5
- switch (pin) {
- case 0:
- PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO0_U, FUNC_GPIO0);
- break;
- case 2:
- PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO2_U, FUNC_GPIO2);
- break;
- case 4:
- PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO4_U, FUNC_GPIO4);
- break;
- case 5:
- PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO5_U, FUNC_GPIO5);
- break;
- default:
- break;
- }
- }
- /* Lua: ws2801.init(pin_clk, pin_data)
- * Sets up the GPIO pins
- *
- * ws2801.init(0, 2) uses GPIO0 as clock and GPIO2 as data.
- * This is the default behavior.
- */
- static int ICACHE_FLASH_ATTR ws2801_init_lua(lua_State* L) {
- uint32_t pin_clk;
- uint32_t pin_data;
- uint32_t func_gpio_clk;
- uint32_t func_gpio_data;
- if (!lua_isnumber(L, 1) || !lua_isnumber(L, 2)) {
- // Use default pins if the input is omitted
- pin_clk = PIN_CLK_DEFAULT;
- pin_data = PIN_DATA_DEFAULT;
- } else {
- pin_clk = luaL_checkinteger(L, 1);
- pin_data = luaL_checkinteger(L, 2);
- }
- ws2801_bit_clk = 1 << pin_clk;
- ws2801_bit_data = 1 << pin_data;
- os_delay_us(10);
- //Set GPIO pins to output mode
- enable_pin_mux(pin_clk);
- enable_pin_mux(pin_data);
- //Set both GPIOs low low
- gpio_output_set(0, ws2801_bit_clk | ws2801_bit_data, ws2801_bit_clk | ws2801_bit_data, 0);
- os_delay_us(10);
- }
- /* Lua: ws2801.write(pin, "string")
- * Byte triples in the string are interpreted as R G B values.
- * This function does not corrupt your buffer.
- *
- * ws2801.write(string.char(255, 0, 0)) sets the first LED red.
- * ws2801.write(string.char(0, 0, 255):rep(10)) sets ten LEDs blue.
- * ws2801.write(string.char(0, 255, 0, 255, 255, 255)) first LED green, second LED white.
- */
- static int ICACHE_FLASH_ATTR ws2801_writergb(lua_State* L) {
- size_t length;
- const char *buffer = luaL_checklstring(L, 1, &length);
- os_delay_us(10);
- ets_intr_lock();
- ws2801_strip(buffer, length);
- ets_intr_unlock();
- return 0;
- }
- static const LUA_REG_TYPE ws2801_map[] =
- {
- { LSTRKEY( "write" ), LFUNCVAL( ws2801_writergb )},
- { LSTRKEY( "init" ), LFUNCVAL( ws2801_init_lua )},
- { LNILKEY, LNILVAL}
- };
- NODEMCU_MODULE(WS2801, "ws2801", ws2801_map, NULL);
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