aod: PPI/RTC-based backlight brightness
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20ac7e8df3
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3dca742b65
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@ -2,38 +2,138 @@
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#include <hal/nrf_gpio.h>
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#include "displayapp/screens/Symbols.h"
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#include "drivers/PinMap.h"
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#include <libraries/delay/nrf_delay.h>
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using namespace Pinetime::Controllers;
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namespace {
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// reinterpret_cast is not constexpr so this is the best we can do
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static NRF_RTC_Type* const RTC = reinterpret_cast<NRF_RTC_Type*>(NRF_RTC2_BASE);
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}
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void BrightnessController::Init() {
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nrf_gpio_cfg_output(PinMap::LcdBacklightLow);
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nrf_gpio_cfg_output(PinMap::LcdBacklightMedium);
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nrf_gpio_cfg_output(PinMap::LcdBacklightHigh);
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nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
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nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
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nrf_gpio_pin_clear(PinMap::LcdBacklightHigh);
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static_assert(timerFrequency == 32768, "Change the prescaler below");
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RTC->PRESCALER = 0;
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// CC1 switches the backlight on (pin transitions from high to low) and resets the counter to 0
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RTC->CC[1] = timerPeriod;
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// Enable compare events for CC0,CC1
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RTC->EVTEN = 0b0000'0000'0000'0011'0000'0000'0000'0000;
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// Disable all interrupts
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RTC->INTENCLR = 0b0000'0000'0000'1111'0000'0000'0000'0011;
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Set(level);
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}
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void BrightnessController::ApplyBrightness(uint16_t rawBrightness) {
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// The classic off, low, medium, high brightnesses are at {0, timerPeriod, timerPeriod*2, timerPeriod*3}
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// These brightness levels do not use PWM: they only set/clear the corresponding pins
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// Any brightness level between the above levels is achieved with efficient RTC based PWM on the next pin up
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// E.g 2.5*timerPeriod corresponds to medium brightness with 50% PWM on the high pin
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// Note: Raw brightness does not necessarily correspond to a linear perceived brightness
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uint8_t pin;
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if (rawBrightness > 2 * timerPeriod) {
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rawBrightness -= 2 * timerPeriod;
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pin = PinMap::LcdBacklightHigh;
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} else if (rawBrightness > timerPeriod) {
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rawBrightness -= timerPeriod;
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pin = PinMap::LcdBacklightMedium;
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} else {
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pin = PinMap::LcdBacklightLow;
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}
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if (rawBrightness == timerPeriod || rawBrightness == 0) {
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if (lastPin != UNSET) {
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RTC->TASKS_STOP = 1;
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nrf_delay_us(rtcStopTime);
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nrf_ppi_channel_disable(ppiBacklightOff);
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nrf_ppi_channel_disable(ppiBacklightOn);
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nrfx_gpiote_out_uninit(lastPin);
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nrf_gpio_cfg_output(lastPin);
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}
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lastPin = UNSET;
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if (rawBrightness == 0) {
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nrf_gpio_pin_set(pin);
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} else {
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nrf_gpio_pin_clear(pin);
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}
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} else {
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// If the pin on which we are doing PWM is changing
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// Disable old PWM channel (if exists) and set up new one
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if (lastPin != pin) {
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if (lastPin != UNSET) {
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RTC->TASKS_STOP = 1;
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nrf_delay_us(rtcStopTime);
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nrf_ppi_channel_disable(ppiBacklightOff);
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nrf_ppi_channel_disable(ppiBacklightOn);
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nrfx_gpiote_out_uninit(lastPin);
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nrf_gpio_cfg_output(lastPin);
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}
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nrfx_gpiote_out_config_t gpioteCfg = {.action = NRF_GPIOTE_POLARITY_TOGGLE,
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.init_state = NRF_GPIOTE_INITIAL_VALUE_LOW,
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.task_pin = true};
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APP_ERROR_CHECK(nrfx_gpiote_out_init(pin, &gpioteCfg));
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nrfx_gpiote_out_task_enable(pin);
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nrf_ppi_channel_endpoint_setup(ppiBacklightOff,
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reinterpret_cast<uint32_t>(&RTC->EVENTS_COMPARE[0]),
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nrfx_gpiote_out_task_addr_get(pin));
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nrf_ppi_channel_endpoint_setup(ppiBacklightOn,
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reinterpret_cast<uint32_t>(&RTC->EVENTS_COMPARE[1]),
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nrfx_gpiote_out_task_addr_get(pin));
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nrf_ppi_fork_endpoint_setup(ppiBacklightOn, reinterpret_cast<uint32_t>(&RTC->TASKS_CLEAR));
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nrf_ppi_channel_enable(ppiBacklightOff);
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nrf_ppi_channel_enable(ppiBacklightOn);
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} else {
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// If the pin used for PWM isn't changing, we only need to set the pin state to the initial value (low)
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RTC->TASKS_STOP = 1;
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nrf_delay_us(rtcStopTime);
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// Due to errata 20,179 and the intricacies of RTC timing, keep it simple: override the pin state
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nrfx_gpiote_out_task_force(pin, false);
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}
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// CC0 switches the backlight off (pin transitions from low to high)
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RTC->CC[0] = rawBrightness;
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RTC->TASKS_CLEAR = 1;
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RTC->TASKS_START = 1;
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lastPin = pin;
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}
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switch (pin) {
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case PinMap::LcdBacklightHigh:
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nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
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nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
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break;
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case PinMap::LcdBacklightMedium:
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nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
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nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
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break;
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case PinMap::LcdBacklightLow:
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nrf_gpio_pin_set(PinMap::LcdBacklightMedium);
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nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
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}
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}
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void BrightnessController::Set(BrightnessController::Levels level) {
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this->level = level;
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switch (level) {
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default:
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case Levels::High:
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nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
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nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
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nrf_gpio_pin_clear(PinMap::LcdBacklightHigh);
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ApplyBrightness(3 * timerPeriod);
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break;
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case Levels::Medium:
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nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
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nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
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nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
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ApplyBrightness(2 * timerPeriod);
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break;
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case Levels::Low:
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nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
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nrf_gpio_pin_set(PinMap::LcdBacklightMedium);
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nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
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ApplyBrightness(timerPeriod);
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break;
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case Levels::AlwaysOn:
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ApplyBrightness(timerPeriod / 10);
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break;
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case Levels::Off:
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nrf_gpio_pin_set(PinMap::LcdBacklightLow);
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nrf_gpio_pin_set(PinMap::LcdBacklightMedium);
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nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
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ApplyBrightness(0);
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break;
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}
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}
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@ -2,11 +2,14 @@
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#include <cstdint>
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#include "nrf_ppi.h"
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#include "nrfx_gpiote.h"
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namespace Pinetime {
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namespace Controllers {
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class BrightnessController {
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public:
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enum class Levels { Off, Low, Medium, High };
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enum class Levels { Off, AlwaysOn, Low, Medium, High };
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void Init();
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void Set(Levels level);
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@ -20,6 +23,25 @@ namespace Pinetime {
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private:
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Levels level = Levels::High;
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static constexpr uint8_t UNSET = UINT8_MAX;
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uint8_t lastPin = UNSET;
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// Maximum time (μs) it takes for the RTC to fully stop
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static constexpr uint8_t rtcStopTime = 46;
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// Frequency of timer used for PWM (Hz)
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static constexpr uint16_t timerFrequency = 32768;
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// Backlight PWM frequency (Hz)
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static constexpr uint16_t pwmFreq = 1000;
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// Wraparound point in timer ticks
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// Defines the number of brightness levels between each pin
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static constexpr uint16_t timerPeriod = timerFrequency / pwmFreq;
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// Warning: nimble reserves some PPIs
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// https://github.com/InfiniTimeOrg/InfiniTime/blob/034d83fe6baf1ab3875a34f8cee387e24410a824/src/libs/mynewt-nimble/nimble/drivers/nrf52/src/ble_phy.c#L53
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// SpiMaster uses PPI 0 for an erratum workaround
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// Channel 1, 2 should be free to use
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static constexpr nrf_ppi_channel_t ppiBacklightOn = NRF_PPI_CHANNEL1;
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static constexpr nrf_ppi_channel_t ppiBacklightOff = NRF_PPI_CHANNEL2;
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void ApplyBrightness(uint16_t val);
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};
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}
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}
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@ -242,11 +242,17 @@ void DisplayApp::Refresh() {
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RestoreBrightness();
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break;
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case Messages::GoToSleep:
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while (brightnessController.Level() != Controllers::BrightnessController::Levels::Off) {
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while (brightnessController.Level() != Controllers::BrightnessController::Levels::Low) {
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brightnessController.Lower();
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vTaskDelay(100);
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}
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// Don't actually turn off the display for AlwaysOn mode
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if (settingsController.GetAlwaysOnDisplay()) {
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brightnessController.Set(Controllers::BrightnessController::Levels::AlwaysOn);
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} else {
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brightnessController.Set(Controllers::BrightnessController::Levels::Off);
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lcd.Sleep();
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}
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PushMessageToSystemTask(Pinetime::System::Messages::OnDisplayTaskSleeping);
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state = States::Idle;
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break;
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@ -102,7 +102,9 @@ void SystemTask::Work() {
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watchdog.Setup(7, Drivers::Watchdog::SleepBehaviour::Run, Drivers::Watchdog::HaltBehaviour::Pause);
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watchdog.Start();
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NRF_LOG_INFO("Last reset reason : %s", Pinetime::Drivers::ResetReasonToString(watchdog.GetResetReason()));
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APP_GPIOTE_INIT(2);
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if (!nrfx_gpiote_is_init()) {
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nrfx_gpiote_init();
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}
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spi.Init();
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spiNorFlash.Init();
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