Tasmota/tasmota/xlgt_03_sm16716.ino

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/*
xlgt_03_sm16716.ino - sm16716 three channel led support for Tasmota
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Copyright (C) 2021 Theo Arends
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_LIGHT
#ifdef USE_SM16716
/*********************************************************************************************\
* SM16716 - Controlling RGB over a synchronous serial line
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* Copyright (C) 2021 Gabor Simon
*
* Source: https://community.home-assistant.io/t/cheap-uk-wifi-bulbs-with-tasmota-teardown-help-tywe3s/40508/27
\*********************************************************************************************/
#define XLGT_03 3
#define D_LOG_SM16716 "SM16716: "
struct SM16716 {
uint8_t pin_clk = 0;
uint8_t pin_dat = 0;
uint8_t pin_sel = 0;
bool enabled = false;
} Sm16716;
void SM16716_SendBit(uint8_t v)
{
/* NOTE:
* According to the spec sheet, max freq is 30 MHz, that is 16.6 ns per high/low half of the
* clk square wave. That is less than the overhead of 'digitalWrite' at this clock rate,
* so no additional delays are needed yet. */
digitalWrite(Sm16716.pin_dat, (v != 0) ? HIGH : LOW);
//delayMicroseconds(1);
digitalWrite(Sm16716.pin_clk, HIGH);
//delayMicroseconds(1);
digitalWrite(Sm16716.pin_clk, LOW);
}
void SM16716_SendByte(uint8_t v)
{
uint8_t mask;
for (mask = 0x80; mask; mask >>= 1) {
SM16716_SendBit(v & mask);
}
}
void SM16716_Update(uint8_t duty_r, uint8_t duty_g, uint8_t duty_b)
{
if (Sm16716.pin_sel < 99) {
bool should_enable = (duty_r | duty_g | duty_b);
if (!Sm16716.enabled && should_enable) {
DEBUG_DRIVER_LOG(PSTR(D_LOG_SM16716 "turning color on"));
Sm16716.enabled = true;
digitalWrite(Sm16716.pin_sel, HIGH);
// in testing I found it takes a minimum of ~380us to wake up the chip
// tested on a Merkury RGBW with an SM726EB
delayMicroseconds(1000);
SM16716_Init();
}
else if (Sm16716.enabled && !should_enable) {
DEBUG_DRIVER_LOG(PSTR(D_LOG_SM16716 "turning color off"));
Sm16716.enabled = false;
digitalWrite(Sm16716.pin_sel, LOW);
}
}
DEBUG_DRIVER_LOG(PSTR(D_LOG_SM16716 "Update; rgb=%02x%02x%02x"), duty_r, duty_g, duty_b);
// send start bit
SM16716_SendBit(1);
SM16716_SendByte(duty_r);
SM16716_SendByte(duty_g);
SM16716_SendByte(duty_b);
// send a 'do it' pulse
// (if multiple chips are chained, each one processes the 1st '1rgb' 25-bit block and
// passes on the rest, right until the one starting with 0)
//SM16716_Init();
SM16716_SendBit(0);
SM16716_SendByte(0);
SM16716_SendByte(0);
SM16716_SendByte(0);
}
/*
bool SM16716_ModuleSelected(void)
{
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Sm16716.pin_clk = Pin(GPIO_SM16716_CLK);
Sm16716.pin_dat = Pin(GPIO_SM16716_DAT);
Sm16716.pin_sel = Pin(GPIO_SM16716_SEL);
DEBUG_DRIVER_LOG(PSTR(D_LOG_SM16716 "ModuleSelected; clk_pin=%d, dat_pin=%d)"), Sm16716.pin_clk, Sm16716.pin_dat);
return (Sm16716.pin_clk < 99) && (Sm16716.pin_dat < 99);
}
*/
void SM16716_Init(void)
{
for (uint32_t t_init = 0; t_init < 50; ++t_init) {
SM16716_SendBit(0);
}
}
/********************************************************************************************/
bool Sm16716SetChannels(void)
{
/*
// handle any PWM pins, skipping the first 3 values for sm16716
for (uint32_t i = 3; i < Light.subtype; i++) {
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if (PinUsed(GPIO_PWM1, i-3)) {
//AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_APPLICATION "Cur_Col%d 10 bits %d, Pwm%d %d"), i, cur_col[i], i+1, curcol);
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analogWrite(Pin(GPIO_PWM1, i-3), bitRead(TasmotaGlobal.pwm_inverted, i-3) ? Settings.pwm_range - cur_col_10bits[i] : cur_col_10bits[i]);
}
}
*/
// handle sm16716 update
uint8_t *cur_col = (uint8_t*)XdrvMailbox.data;
SM16716_Update(cur_col[0], cur_col[1], cur_col[2]);
return true;
}
void Sm16716ModuleSelected(void)
{
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if (PinUsed(GPIO_SM16716_CLK) && PinUsed(GPIO_SM16716_DAT)) {
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Sm16716.pin_clk = Pin(GPIO_SM16716_CLK);
Sm16716.pin_dat = Pin(GPIO_SM16716_DAT);
Sm16716.pin_sel = Pin(GPIO_SM16716_SEL);
/*
// init PWM
for (uint32_t i = 0; i < Light.subtype; i++) {
Settings.pwm_value[i] = 0; // Disable direct PWM control
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if (PinUsed(GPIO_PWM1, i)) {
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#ifdef ESP8266
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pinMode(Pin(GPIO_PWM1, i), OUTPUT);
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#endif // ESP8266
#ifdef ESP32
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analogAttach(Pin(GPIO_PWM1, i), i);
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#endif // ESP32
}
}
*/
// init sm16716
pinMode(Sm16716.pin_clk, OUTPUT);
digitalWrite(Sm16716.pin_clk, LOW);
pinMode(Sm16716.pin_dat, OUTPUT);
digitalWrite(Sm16716.pin_dat, LOW);
if (Sm16716.pin_sel < 99) {
pinMode(Sm16716.pin_sel, OUTPUT);
digitalWrite(Sm16716.pin_sel, LOW);
// no need to call SM16716_Init here, it will be called after sel goes HIGH
} else {
// no sel pin means you have an 'always on' chip, so init right away
SM16716_Init();
}
LightPwmOffset(LST_RGB); // Handle any PWM pins, skipping the first 3 color values for sm16716
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TasmotaGlobal.light_type += LST_RGB; // Add RGB to be controlled by sm16716
TasmotaGlobal.light_driver = XLGT_03;
AddLog_P(LOG_LEVEL_DEBUG, PSTR("DBG: SM16716 Found"));
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xlgt03(uint8_t function)
{
bool result = false;
switch (function) {
case FUNC_SET_CHANNELS:
result = Sm16716SetChannels();
break;
case FUNC_MODULE_INIT:
Sm16716ModuleSelected();
break;
}
return result;
}
#endif // USE_SM16716
#endif // USE_LIGHT