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