Merge pull request #483 from Riksu9000/fix_adc
Fix misconfigured ADC and remove now unnecessary filtering
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commit
9fb3755088
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@ -23,7 +23,6 @@ void Battery::Update() {
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return;
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}
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// Non blocking read
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samples = 0;
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isReading = true;
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SaadcInit();
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@ -40,9 +39,9 @@ void Battery::SaadcInit() {
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nrf_saadc_channel_config_t adcChannelConfig = {.resistor_p = NRF_SAADC_RESISTOR_DISABLED,
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.resistor_n = NRF_SAADC_RESISTOR_DISABLED,
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.gain = NRF_SAADC_GAIN1_5,
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.gain = NRF_SAADC_GAIN1_4,
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.reference = NRF_SAADC_REFERENCE_INTERNAL,
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.acq_time = NRF_SAADC_ACQTIME_3US,
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.acq_time = NRF_SAADC_ACQTIME_40US,
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.mode = NRF_SAADC_MODE_SINGLE_ENDED,
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.burst = NRF_SAADC_BURST_ENABLED,
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.pin_p = batteryVoltageAdcInput,
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@ -60,22 +59,21 @@ void Battery::SaadcEventHandler(nrfx_saadc_evt_t const* p_event) {
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APP_ERROR_CHECK(nrfx_saadc_buffer_convert(&saadc_value, 1));
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// A hardware voltage divider divides the battery voltage by 2
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// ADC gain is 1/5
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// thus adc_voltage = battery_voltage / 2 * gain = battery_voltage / 10
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// reference_voltage is 0.6V
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// ADC gain is 1/4
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// thus adc_voltage = battery_voltage / 2 * gain = battery_voltage / 8
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// reference_voltage is 600mV
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// p_event->data.done.p_buffer[0] = (adc_voltage / reference_voltage) * 1024
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voltage = p_event->data.done.p_buffer[0] * 6000 / 1024;
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percentRemaining = (voltage - battery_min) * 100 / (battery_max - battery_min);
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percentRemaining = std::max(percentRemaining, 0);
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percentRemaining = std::min(percentRemaining, 100);
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percentRemainingBuffer.Insert(percentRemaining);
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voltage = p_event->data.done.p_buffer[0] * (8 * 600) / 1024;
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samples++;
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if (samples > percentRemainingSamples) {
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nrfx_saadc_uninit();
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isReading = false;
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if (voltage > battery_max) {
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percentRemaining = 100;
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} else if (voltage < battery_min) {
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percentRemaining = 0;
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} else {
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nrfx_saadc_sample();
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percentRemaining = (voltage - battery_min) * 100 / (battery_max - battery_min);
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}
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nrfx_saadc_uninit();
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isReading = false;
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}
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}
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@ -7,38 +7,6 @@
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namespace Pinetime {
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namespace Controllers {
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/** A simple circular buffer that can be used to average
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out the sensor values. The total capacity of the CircBuffer
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is given as the template parameter N.
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*/
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template <int N> class CircBuffer {
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public:
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CircBuffer() : arr {}, sz {}, cap {N}, head {} {
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}
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/**
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insert member function overwrites the next data to the current
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HEAD and moves the HEAD to the newly inserted value.
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*/
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void Insert(const uint8_t num) {
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head %= cap;
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arr[head++] = num;
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if (sz != cap) {
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sz++;
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}
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}
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uint8_t GetAverage() const {
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int sum = std::accumulate(arr.begin(), arr.end(), 0);
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return static_cast<uint8_t>(sum / sz);
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}
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private:
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std::array<uint8_t, N> arr; /**< internal array used to store the values*/
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uint8_t sz; /**< The current size of the array.*/
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uint8_t cap; /**< Total capacity of the CircBuffer.*/
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uint8_t head; /**< The current head of the CircBuffer*/
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};
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class Battery {
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public:
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Battery();
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@ -47,10 +15,7 @@ namespace Pinetime {
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void Update();
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uint8_t PercentRemaining() const {
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auto avg = percentRemainingBuffer.GetAverage();
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avg = std::min(avg, static_cast<uint8_t>(100));
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avg = std::max(avg, static_cast<uint8_t>(0));
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return avg;
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return percentRemaining;
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}
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uint16_t Voltage() const {
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@ -69,14 +34,11 @@ namespace Pinetime {
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static Battery* instance;
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nrf_saadc_value_t saadc_value;
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static constexpr uint8_t percentRemainingSamples = 5;
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CircBuffer<percentRemainingSamples> percentRemainingBuffer {};
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static constexpr uint32_t chargingPin = 12;
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static constexpr uint32_t powerPresentPin = 19;
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static constexpr nrf_saadc_input_t batteryVoltageAdcInput = NRF_SAADC_INPUT_AIN7;
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uint16_t voltage = 0;
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int percentRemaining = -1;
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uint8_t percentRemaining = 0;
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bool isCharging = false;
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bool isPowerPresent = false;
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@ -87,7 +49,6 @@ namespace Pinetime {
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static void AdcCallbackStatic(nrfx_saadc_evt_t const* event);
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bool isReading = false;
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uint8_t samples = 0;
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};
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}
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}
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