mirror of https://github.com/arendst/Tasmota.git
204 lines
6.8 KiB
C++
204 lines
6.8 KiB
C++
/*
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xdrv_15_pca9685.ino - Support for I2C PCA9685 12bit 16 pin hardware PWM driver on Tasmota
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Copyright (C) 2019 Andre Thomas and Theo Arends
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_I2C
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#ifdef USE_PCA9685
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#define XDRV_15 15
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#define XI2C_01 1 // See I2CDEVICES.md
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#define PCA9685_REG_MODE1 0x00
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#define PCA9685_REG_LED0_ON_L 0x06
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#define PCA9685_REG_PRE_SCALE 0xFE
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#ifndef USE_PCA9685_FREQ
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#define USE_PCA9685_FREQ 50
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#endif
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uint8_t pca9685_detected = 0;
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uint16_t pca9685_freq = USE_PCA9685_FREQ;
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uint16_t pca9685_pin_pwm_value[16];
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void PCA9685_Detect(void)
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{
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if (pca9685_detected) { return; }
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uint8_t buffer;
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if (I2cValidRead8(&buffer, USE_PCA9685_ADDR, PCA9685_REG_MODE1)) {
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I2cWrite8(USE_PCA9685_ADDR, PCA9685_REG_MODE1, 0x20);
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if (I2cValidRead8(&buffer, USE_PCA9685_ADDR, PCA9685_REG_MODE1)) {
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if (0x20 == buffer) {
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pca9685_detected = 1;
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AddLog_P2(LOG_LEVEL_DEBUG, S_LOG_I2C_FOUND_AT, "PCA9685", USE_PCA9685_ADDR);
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PCA9685_Reset(); // Reset the controller
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}
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}
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}
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}
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void PCA9685_Reset(void)
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{
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I2cWrite8(USE_PCA9685_ADDR, PCA9685_REG_MODE1, 0x80);
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PCA9685_SetPWMfreq(USE_PCA9685_FREQ);
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for (uint32_t pin=0;pin<16;pin++) {
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PCA9685_SetPWM(pin,0,false);
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pca9685_pin_pwm_value[pin] = 0;
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}
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Response_P(PSTR("{\"PCA9685\":{\"RESET\":\"OK\"}}"));
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}
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void PCA9685_SetPWMfreq(double freq) {
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/*
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7.3.5 from datasheet
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prescale value = round(25000000/(4096*freq))-1;
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*/
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if (freq > 23 && freq < 1527) {
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pca9685_freq=freq;
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} else {
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pca9685_freq=50;
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}
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uint8_t pre_scale_osc = round(25000000/(4096*pca9685_freq))-1;
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if (1526 == pca9685_freq) pre_scale_osc=0xFF; // force setting for 24hz because rounding causes 1526 to be 254
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uint8_t current_mode1 = I2cRead8(USE_PCA9685_ADDR, PCA9685_REG_MODE1); // read current value of MODE1 register
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uint8_t sleep_mode1 = (current_mode1&0x7F) | 0x10; // Determine register value to put PCA to sleep
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I2cWrite8(USE_PCA9685_ADDR, PCA9685_REG_MODE1, sleep_mode1); // Let's sleep a little
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I2cWrite8(USE_PCA9685_ADDR, PCA9685_REG_PRE_SCALE, pre_scale_osc); // Set the pre-scaler
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I2cWrite8(USE_PCA9685_ADDR, PCA9685_REG_MODE1, current_mode1 | 0xA0); // Reset MODE1 register to original state and enable auto increment
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}
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void PCA9685_SetPWM_Reg(uint8_t pin, uint16_t on, uint16_t off) {
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uint8_t led_reg = PCA9685_REG_LED0_ON_L + 4 * pin;
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uint32_t led_data = 0;
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I2cWrite8(USE_PCA9685_ADDR, led_reg, on);
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I2cWrite8(USE_PCA9685_ADDR, led_reg+1, (on >> 8));
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I2cWrite8(USE_PCA9685_ADDR, led_reg+2, off);
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I2cWrite8(USE_PCA9685_ADDR, led_reg+3, (off >> 8));
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}
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void PCA9685_SetPWM(uint8_t pin, uint16_t pwm, bool inverted) {
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if (4096 == pwm) {
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PCA9685_SetPWM_Reg(pin, 4096, 0); // Special use additional bit causes channel to turn on completely without PWM
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} else {
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PCA9685_SetPWM_Reg(pin, 0, pwm);
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}
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pca9685_pin_pwm_value[pin] = pwm;
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}
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bool PCA9685_Command(void)
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{
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bool serviced = true;
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bool validpin = false;
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uint8_t paramcount = 0;
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if (XdrvMailbox.data_len > 0) {
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paramcount=1;
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} else {
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serviced = false;
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return serviced;
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}
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char sub_string[XdrvMailbox.data_len];
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for (uint32_t ca=0;ca<XdrvMailbox.data_len;ca++) {
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if ((' ' == XdrvMailbox.data[ca]) || ('=' == XdrvMailbox.data[ca])) { XdrvMailbox.data[ca] = ','; }
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if (',' == XdrvMailbox.data[ca]) { paramcount++; }
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}
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UpperCase(XdrvMailbox.data,XdrvMailbox.data);
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if (!strcmp(subStr(sub_string, XdrvMailbox.data, ",", 1),"RESET")) { PCA9685_Reset(); return serviced; }
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if (!strcmp(subStr(sub_string, XdrvMailbox.data, ",", 1),"STATUS")) { PCA9685_OutputTelemetry(false); return serviced; }
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if (!strcmp(subStr(sub_string, XdrvMailbox.data, ",", 1),"PWMF")) {
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if (paramcount > 1) {
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uint16_t new_freq = atoi(subStr(sub_string, XdrvMailbox.data, ",", 2));
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if ((new_freq >= 24) && (new_freq <= 1526)) {
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PCA9685_SetPWMfreq(new_freq);
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Response_P(PSTR("{\"PCA9685\":{\"PWMF\":%i, \"Result\":\"OK\"}}"),new_freq);
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return serviced;
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}
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} else { // No parameter was given for setfreq, so we return current setting
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Response_P(PSTR("{\"PCA9685\":{\"PWMF\":%i}}"),pca9685_freq);
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return serviced;
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}
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}
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if (!strcmp(subStr(sub_string, XdrvMailbox.data, ",", 1),"PWM")) {
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if (paramcount > 1) {
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uint8_t pin = atoi(subStr(sub_string, XdrvMailbox.data, ",", 2));
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if (paramcount > 2) {
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if (!strcmp(subStr(sub_string, XdrvMailbox.data, ",", 3), "ON")) {
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PCA9685_SetPWM(pin, 4096, false);
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Response_P(PSTR("{\"PCA9685\":{\"PIN\":%i,\"PWM\":%i}}"),pin,4096);
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serviced = true;
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return serviced;
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}
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if (!strcmp(subStr(sub_string, XdrvMailbox.data, ",", 3), "OFF")) {
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PCA9685_SetPWM(pin, 0, false);
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Response_P(PSTR("{\"PCA9685\":{\"PIN\":%i,\"PWM\":%i}}"),pin,0);
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serviced = true;
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return serviced;
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}
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uint16_t pwm = atoi(subStr(sub_string, XdrvMailbox.data, ",", 3));
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if ((pin >= 0 && pin <= 15) && (pwm >= 0 && pwm <= 4096)) {
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PCA9685_SetPWM(pin, pwm, false);
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Response_P(PSTR("{\"PCA9685\":{\"PIN\":%i,\"PWM\":%i}}"),pin,pwm);
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serviced = true;
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return serviced;
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}
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}
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}
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}
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return serviced;
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}
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void PCA9685_OutputTelemetry(bool telemetry) {
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if (0 == pca9685_detected) { return; } // We do not do this if the PCA9685 has not been detected
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ResponseTime_P(PSTR(",\"PCA9685\":{\"PWM_FREQ\":%i,"),pca9685_freq);
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for (uint32_t pin=0;pin<16;pin++) {
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ResponseAppend_P(PSTR("\"PWM%i\":%i,"),pin,pca9685_pin_pwm_value[pin]);
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}
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ResponseAppend_P(PSTR("\"END\":1}}"));
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if (telemetry) {
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MqttPublishPrefixTopic_P(TELE, PSTR(D_RSLT_SENSOR), Settings.flag.mqtt_sensor_retain); // CMND_SENSORRETAIN
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}
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}
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bool Xdrv15(uint8_t function)
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{
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if (!I2cEnabled(XI2C_01)) { return false; }
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bool result = false;
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switch (function) {
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case FUNC_EVERY_SECOND:
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PCA9685_Detect();
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if (tele_period == 0) {
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PCA9685_OutputTelemetry(true);
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}
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break;
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case FUNC_COMMAND_DRIVER:
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if (XDRV_15 == XdrvMailbox.index) {
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result = PCA9685_Command();
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}
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break;
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}
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return result;
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}
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#endif // USE_PCA9685
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#endif // USE_IC2
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