CCF_100/InfiniTime
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Refactored Ppg for frequency based algorithm. (#1486)

Browse Source 
New implementation of the heart rate sensor data processing using a frequency based PPG algorithm.
The HRS3300 settings are fine-tuned for better signal to noise at 10Hz.
The measurement delay is now set to 100ms.
Enable and use the ambient light sensor.
FFT implementation based on ArduinoFFT (https://github.com/kosme/arduinoFFT, GPLv3.0).
This commit is contained in:
Ceimour
2023-04-30 08:50:18 -05:00
committed by GitHub
parent 40f7e1c7be
commit c22e30a4a6
26 changed files with 2675 additions and 210 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
src/drivers/Hrs3300.cpp
View File

@@ -16,6 +16,8 @@ using namespace Pinetime::Drivers;
/** Driver for the HRS3300 heart rate sensor.
* Original implementation from wasp-os : https://github.com/daniel-thompson/wasp-os/blob/master/wasp/drivers/hrs3300.py
*
* Experimentaly derived changes to improve signal/noise (see comments below) - Ceimour
*/
Hrs3300::Hrs3300(TwiMaster& twiMaster, uint8_t twiAddress) : twiMaster {twiMaster}, twiAddress {twiAddress} {
}
@@ -26,19 +28,21 @@ void Hrs3300::Init() {
Disable();
vTaskDelay(100);
// HRS disabled, 12.5 ms wait time between cycles, (partly) 20mA drive
WriteRegister(static_cast<uint8_t>(Registers::Enable), 0x60);
// HRS disabled, 50ms wait time between ADC conversion period, current 12.5mA
WriteRegister(static_cast<uint8_t>(Registers::Enable), 0x50);
// (partly) 20mA drive, power on, "magic" (datasheet says both
// "reserved" and "set low nibble to 8" but 0xe gives better results
// and is used by at least two other HRS3300 drivers
WriteRegister(static_cast<uint8_t>(Registers::PDriver), 0x6E);
// Current 12.5mA and low nibble 0xF.
// Note: Setting low nibble to 0x8 per the datasheet results in
// modulated LED driver output. Setting to 0xF results in clean,
// steady output during the ADC conversion period.
WriteRegister(static_cast<uint8_t>(Registers::PDriver), 0x2f);
// HRS and ALS both in 16-bit mode
WriteRegister(static_cast<uint8_t>(Registers::Res), 0x88);
// HRS and ALS both in 15-bit mode results in ~50ms LED drive period
// and presumably ~50ms ADC conversion period.
WriteRegister(static_cast<uint8_t>(Registers::Res), 0x77);
// 8x gain, non default, reduced value for better readings
WriteRegister(static_cast<uint8_t>(Registers::Hgain), 0xc);
// Gain set to 1x
WriteRegister(static_cast<uint8_t>(Registers::Hgain), 0x00);
}
void Hrs3300::Enable() {