154 lines
4.3 KiB
C++
154 lines
4.3 KiB
C++
#include "breakout_mics6814.hpp"
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#include <algorithm>
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namespace pimoroni {
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bool BreakoutMICS6814::init(bool skip_chip_id_check) {
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bool success = false;
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if(ioe.init(skip_chip_id_check)) {
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ioe.set_mode(MICS_VREF, IOExpander::PIN_ADC);
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ioe.set_mode(MICS_RED, IOExpander::PIN_ADC);
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ioe.set_mode(MICS_NH3, IOExpander::PIN_ADC);
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ioe.set_mode(MICS_OX, IOExpander::PIN_ADC);
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ioe.set_mode(MICS_HEATER_EN, IOExpander::PIN_OD);
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ioe.output(MICS_HEATER_EN, IOExpander::LOW);
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// Calculate a period large enough to get 0-255 steps at the desired brightness
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uint16_t period = (uint16_t)(255.0f / brightness);
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ioe.set_pwm_period(period);
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ioe.set_pwm_control(2); // PWM as fast as we can to avoid LED flicker
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ioe.set_mode(LED_R, IOExpander::PIN_PWM, false, INVERT_OUTPUT);
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ioe.set_mode(LED_G, IOExpander::PIN_PWM, false, INVERT_OUTPUT);
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ioe.set_mode(LED_B, IOExpander::PIN_PWM, false, INVERT_OUTPUT);
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success = true;
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}
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return success;
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}
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i2c_inst_t* BreakoutMICS6814::get_i2c() const {
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return ioe.get_i2c();
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}
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int BreakoutMICS6814::get_sda() const {
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return ioe.get_sda();
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}
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int BreakoutMICS6814::get_scl() const {
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return ioe.get_scl();
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}
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int BreakoutMICS6814::get_int() const {
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return ioe.get_int();
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}
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void BreakoutMICS6814::set_address(uint8_t address) {
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ioe.set_address(address);
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}
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float BreakoutMICS6814::get_adc_vref(void) {
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return ioe.get_adc_vref();
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}
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void BreakoutMICS6814::set_adc_vref(float vref) {
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ioe.set_adc_vref(vref);
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}
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void BreakoutMICS6814::set_brightness(float brightness) {
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this->brightness = std::min(std::max(brightness, 0.01f), 1.0f);
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// Calculate a period large enough to get 0-255 steps at the desired brightness
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uint16_t period = (uint16_t)(255.0f / this->brightness);
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ioe.set_pwm_period(period);
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}
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void BreakoutMICS6814::set_led(uint8_t r, uint8_t g, uint8_t b) {
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ioe.output(LED_R, r, false); // Hold off pwm load until the last
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ioe.output(LED_G, g, false); // Hold off pwm load until the last
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ioe.output(LED_B, b); // Loads all 3 pwms
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}
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void BreakoutMICS6814::set_heater(bool on) {
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ioe.output(MICS_HEATER_EN, on ? IOExpander::LOW : IOExpander::HIGH);
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}
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void BreakoutMICS6814::disable_heater() {
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ioe.output(MICS_HEATER_EN, IOExpander::HIGH);
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ioe.set_mode(MICS_HEATER_EN, IOExpander::PIN_IN);
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}
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float BreakoutMICS6814::get_raw_ref(uint32_t adc_timeout) {
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return ioe.input_as_voltage(MICS_VREF, adc_timeout);
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}
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float BreakoutMICS6814::get_raw_red(uint32_t adc_timeout) {
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return ioe.input_as_voltage(MICS_RED, adc_timeout);
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}
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float BreakoutMICS6814::get_raw_nh3(uint32_t adc_timeout) {
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return ioe.input_as_voltage(MICS_NH3, adc_timeout);
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}
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float BreakoutMICS6814::get_raw_oxd(uint32_t adc_timeout) {
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return ioe.input_as_voltage(MICS_OX, adc_timeout);
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}
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BreakoutMICS6814::Reading BreakoutMICS6814::read_all(uint32_t adc_timeout) {
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BreakoutMICS6814::Reading reading;
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reading.reducing = read_reducing(adc_timeout);
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reading.nh3 = read_nh3(adc_timeout);
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reading.oxidising = read_oxidising(adc_timeout);
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reading.ref = read_ref(adc_timeout);
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return reading;
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}
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float BreakoutMICS6814::read_ref(uint32_t adc_timeout) {
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float ref = get_raw_ref(adc_timeout);
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if(ref == -1)
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ref = 0;
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return ref;
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}
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float BreakoutMICS6814::read_reducing(uint32_t adc_timeout) {
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float vref = ioe.get_adc_vref();
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float red = get_raw_red(adc_timeout);
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if((red != -1) && (vref != red))
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red = (red * 56000.0f) / (vref - red);
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else
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red = 0;
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return red;
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}
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float BreakoutMICS6814::read_nh3(uint32_t adc_timeout) {
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float vref = ioe.get_adc_vref();
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float nh3 = get_raw_red(adc_timeout);
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if((nh3 != -1) && (vref != nh3))
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nh3 = (nh3 * 56000.0f) / (vref - nh3);
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else
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nh3 = 0;
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return nh3;
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}
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float BreakoutMICS6814::read_oxidising(uint32_t adc_timeout) {
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float vref = ioe.get_adc_vref();
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float oxd = get_raw_red(adc_timeout);
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if((oxd != -1) && (vref != oxd))
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oxd = (oxd * 56000.0f) / (vref - oxd);
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else
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oxd = 0;
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return oxd;
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}
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} |