106 lines
3.3 KiB
C++
106 lines
3.3 KiB
C++
/*
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SPDX-License-Identifier: LGPL-3.0-or-later
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Original work Copyright (C) 2020 Daniel Thompson
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C++ port Copyright (C) 2021 Jean-François Milants
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*/
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#include "drivers/Hrs3300.h"
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#include <algorithm>
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#include <nrf_gpio.h>
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#include <FreeRTOS.h>
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#include <task.h>
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#include <nrf_log.h>
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using namespace Pinetime::Drivers;
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/** Driver for the HRS3300 heart rate sensor.
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* Original implementation from wasp-os : https://github.com/daniel-thompson/wasp-os/blob/master/wasp/drivers/hrs3300.py
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*/
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Hrs3300::Hrs3300(TwiMaster& twiMaster, uint8_t twiAddress) : twiMaster {twiMaster}, twiAddress {twiAddress} {
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}
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void Hrs3300::Init() {
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nrf_gpio_cfg_input(30, NRF_GPIO_PIN_NOPULL);
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Disable();
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vTaskDelay(100);
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// HRS disabled, 12.5 ms wait time between cycles, (partly) 20mA drive
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WriteRegister(static_cast<uint8_t>(Registers::Enable), 0x60);
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// (partly) 20mA drive, power on, "magic" (datasheet says both
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// "reserved" and "set low nibble to 8" but 0xe gives better results
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// and is used by at least two other HRS3300 drivers
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WriteRegister(static_cast<uint8_t>(Registers::PDriver), 0x6E);
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// HRS and ALS both in 16-bit mode
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WriteRegister(static_cast<uint8_t>(Registers::Res), 0x88);
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// 8x gain, non default, reduced value for better readings
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WriteRegister(static_cast<uint8_t>(Registers::Hgain), 0xc);
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}
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void Hrs3300::Enable() {
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NRF_LOG_INFO("ENABLE");
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auto value = ReadRegister(static_cast<uint8_t>(Registers::Enable));
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value |= 0x80;
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WriteRegister(static_cast<uint8_t>(Registers::Enable), value);
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}
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void Hrs3300::Disable() {
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NRF_LOG_INFO("DISABLE");
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auto value = ReadRegister(static_cast<uint8_t>(Registers::Enable));
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value &= ~0x80;
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WriteRegister(static_cast<uint8_t>(Registers::Enable), value);
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}
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uint32_t Hrs3300::ReadHrs() {
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auto m = ReadRegister(static_cast<uint8_t>(Registers::C0DataM));
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auto h = ReadRegister(static_cast<uint8_t>(Registers::C0DataH));
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auto l = ReadRegister(static_cast<uint8_t>(Registers::C0dataL));
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return ((l & 0x30) << 12) | (m << 8) | ((h & 0x0f) << 4) | (l & 0x0f);
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}
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uint32_t Hrs3300::ReadAls() {
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auto m = ReadRegister(static_cast<uint8_t>(Registers::C1dataM));
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auto h = ReadRegister(static_cast<uint8_t>(Registers::C1dataH));
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auto l = ReadRegister(static_cast<uint8_t>(Registers::C1dataL));
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return ((h & 0x3f) << 11) | (m << 3) | (l & 0x07);
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}
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void Hrs3300::SetGain(uint8_t gain) {
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constexpr uint8_t maxGain = 64U;
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gain = std::min(gain, maxGain);
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uint8_t hgain = 0;
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while ((1 << hgain) < gain) {
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++hgain;
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}
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WriteRegister(static_cast<uint8_t>(Registers::Hgain), hgain << 2);
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}
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void Hrs3300::SetDrive(uint8_t drive) {
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auto en = ReadRegister(static_cast<uint8_t>(Registers::Enable));
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auto pd = ReadRegister(static_cast<uint8_t>(Registers::PDriver));
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en = (en & 0xf7) | ((drive & 2) << 2);
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pd = (pd & 0xbf) | ((drive & 1) << 6);
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WriteRegister(static_cast<uint8_t>(Registers::Enable), en);
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WriteRegister(static_cast<uint8_t>(Registers::PDriver), pd);
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}
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void Hrs3300::WriteRegister(uint8_t reg, uint8_t data) {
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auto ret = twiMaster.Write(twiAddress, reg, &data, 1);
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if (ret != TwiMaster::ErrorCodes::NoError)
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NRF_LOG_INFO("WRITE ERROR");
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}
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uint8_t Hrs3300::ReadRegister(uint8_t reg) {
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uint8_t value;
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auto ret = twiMaster.Read(twiAddress, reg, &value, 1);
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if (ret != TwiMaster::ErrorCodes::NoError)
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NRF_LOG_INFO("READ ERROR");
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return value;
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}
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