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- #include "module.h"
- #include "lauxlib.h"
- #include "platform.h"
- #include "c_stdlib.h"
- #include "c_string.h"
- #include "user_interface.h"
- static inline uint32_t _getCycleCount(void) {
- uint32_t cycles;
- __asm__ __volatile__("rsr %0,ccount":"=a" (cycles));
- return cycles;
- }
- // This algorithm reads the cpu clock cycles to calculate the correct
- // pulse widths. It works in both 80 and 160 MHz mode.
- static void ICACHE_RAM_ATTR tm1829_write_to_pin(uint8_t pin, uint8_t *pixels, uint32_t length) {
- uint8_t *p, *end;
- p = pixels;
- end = p + length;
- const uint32_t t0l = (1000 * system_get_cpu_freq()) / 3333; // 0.390us (spec=0.35 +- 0.15)
- const uint32_t t1l = (1000 * system_get_cpu_freq()) / 1250; // 0.800us (spec=0.70 +- 0.15)
- const uint32_t ttot = (1000 * system_get_cpu_freq()) / 800; // 1.25us
- while (p != end) {
- register int i;
- register uint8_t pixel = *p++;
- ets_intr_lock();
- for (i = 7; i >= 0; i--) {
- register uint32_t pin_mask = 1 << pin;
- // Select low time
- register uint32_t tl = ((pixel >> i) & 1) ? t1l : t0l;
- register uint32_t t1, t2;
- register uint32_t t = _getCycleCount();
- t1 = t + tl;
- t2 = t + ttot;
- GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pin_mask); // Set pin low
- while (_getCycleCount() < t1);
- GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pin_mask); // Set pin high
- while (_getCycleCount() < t2);
- }
- ets_intr_unlock();
- }
- }
- // Lua: tm1829.write(pin, "string")
- // Byte triples in the string are interpreted as R G B values and sent to the hardware as G R B.
- // WARNING: this function scrambles the input buffer :
- // a = string.char(255,0,128)
- // tm1829.write(3,a)
- // =a.byte()
- // (0,255,128)
- static int ICACHE_FLASH_ATTR tm1829_write(lua_State* L)
- {
- const uint8_t pin = luaL_checkinteger(L, 1);
- size_t length;
- const char *rgb = luaL_checklstring(L, 2, &length);
- // dont modify lua-internal lstring - make a copy instead
- char *buffer = (char *)c_malloc(length);
- // Ignore incomplete Byte triples at the end of buffer
- length -= length % 3;
- // Copy payload and make sure first byte is < 0xFF (triggers
- // constant current command, instead of PWM duty command)
- size_t i;
- for (i = 0; i < length; i += 3) {
- buffer[i] = rgb[i];
- buffer[i + 1] = rgb[i + 1];
- buffer[i + 2] = rgb[i + 2];
- // Check for first byte
- if (buffer[i] == 0xff)
- buffer[i] = 0xfe;
- }
- // Initialize the output pin and wait a bit
- platform_gpio_mode(pin, PLATFORM_GPIO_OUTPUT, PLATFORM_GPIO_FLOAT);
- platform_gpio_write(pin, 1);
- // Send the buffer
- tm1829_write_to_pin(pin_num[pin], (uint8_t*) buffer, length);
- os_delay_us(500); // reset time
- c_free(buffer);
- return 0;
- }
- static const LUA_REG_TYPE tm1829_map[] =
- {
- { LSTRKEY( "write" ), LFUNCVAL( tm1829_write) },
- { LNILKEY, LNILVAL }
- };
- int luaopen_tm1829(lua_State *L) {
- // TODO: Make sure that the GPIO system is initialized
- return 0;
- }
- NODEMCU_MODULE(TM1829, "tm1829", tm1829_map, luaopen_tm1829);
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