Alexandru Radu / Mbed 2 deprecated RD117_LCD_copy

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependencies:   TextLCD mbed

Fork of RD117_MBED by Maxim Integrated

Embed: (wiki syntax)

« Back to documentation index

algorithm.cpp File Reference
Functions

algorithm.cpp File Reference

****************************************************** More...

Go to the source code of this file.

Functions

void maxim_heart_rate_and_oxygen_saturation (uint32_t *pun_ir_buffer, int32_t n_ir_buffer_length, uint32_t *pun_red_buffer, int32_t *pn_spo2, int8_t *pch_spo2_valid, int32_t *pn_heart_rate, int8_t *pch_hr_valid)
 Calculate the heart rate and SpO2 level.
void maxim_find_peaks (int32_t *pn_locs, int32_t *pn_npks, int32_t *pn_x, int32_t n_size, int32_t n_min_height, int32_t n_min_distance, int32_t n_max_num)
 Find peaks.
void maxim_peaks_above_min_height (int32_t *pn_locs, int32_t *pn_npks, int32_t *pn_x, int32_t n_size, int32_t n_min_height)
 Find peaks above n_min_height.
void maxim_remove_close_peaks (int32_t *pn_locs, int32_t *pn_npks, int32_t *pn_x, int32_t n_min_distance)
 Remove peaks.
void maxim_sort_ascend (int32_t *pn_x, int32_t n_size)
 Sort array.
void maxim_sort_indices_descend (int32_t *pn_x, int32_t *pn_indx, int32_t n_size)
 Sort indices.

Detailed Description

******************************************************

Project: MAXREFDES117# Filename: algorithm.cpp Description: This module calculates the heart rate/SpO2 level

--------------------------------------------------------------------

This code follows the following naming conventions:

char ch_pmod_value char (array) s_pmod_s_string[16] float f_pmod_value int32_t n_pmod_value int32_t (array) an_pmod_value[16] int16_t w_pmod_value int16_t (array) aw_pmod_value[16] uint16_t uw_pmod_value uint16_t (array) auw_pmod_value[16] uint8_t uch_pmod_value uint8_t (array) auch_pmod_buffer[16] uint32_t un_pmod_value int32_t * pn_pmod_value

-------------------------------------------------------------------------

Definition in file algorithm.cpp.

Function Documentation

void maxim_find_peaks ( int32_t *  pn_locs,
int32_t *  pn_npks,
int32_t *  pn_x,
int32_t  n_size,
int32_t  n_min_height,
int32_t  n_min_distance,
int32_t  n_max_num 
)

Find peaks.

Details
Find at most MAX_NUM peaks above MIN_HEIGHT separated by at least MIN_DISTANCE
Return values:
None

Definition at line 254 of file algorithm.cpp.

void maxim_heart_rate_and_oxygen_saturation ( uint32_t *  pun_ir_buffer,
int32_t  n_ir_buffer_length,
uint32_t *  pun_red_buffer,
int32_t *  pn_spo2,
int8_t *  pch_spo2_valid,
int32_t *  pn_heart_rate,
int8_t *  pch_hr_valid 
)

Calculate the heart rate and SpO2 level.

Details
By detecting peaks of PPG cycle and corresponding AC/DC of red/infra-red signal, the ratio for the SPO2 is computed. Since this algorithm is aiming for Arm M0/M3. formaula for SPO2 did not achieve the accuracy due to register overflow. Thus, accurate SPO2 is precalculated and save longo uch_spo2_table[] per each ratio.
Parameters:
[in]*pun_ir_buffer- IR sensor data buffer
[in]n_ir_buffer_length- IR sensor data buffer length
[in]*pun_red_buffer- Red sensor data buffer
[out]*pn_spo2- Calculated SpO2 value
[out]*pch_spo2_valid- 1 if the calculated SpO2 value is valid
[out]*pn_heart_rate- Calculated heart rate value
[out]*pch_hr_valid- 1 if the calculated heart rate value is valid
Return values:
None

Definition at line 62 of file algorithm.cpp.

void maxim_peaks_above_min_height ( int32_t *  pn_locs,
int32_t *  pn_npks,
int32_t *  pn_x,
int32_t  n_size,
int32_t  n_min_height 
)

Find peaks above n_min_height.

Details
Find all peaks above MIN_HEIGHT
Return values:
None

Definition at line 268 of file algorithm.cpp.

void maxim_remove_close_peaks ( int32_t *  pn_locs,
int32_t *  pn_npks,
int32_t *  pn_x,
int32_t  n_min_distance 
)

Remove peaks.

Details
Remove peaks separated by less than MIN_DISTANCE
Return values:
None

Definition at line 299 of file algorithm.cpp.

void maxim_sort_ascend ( int32_t *  pn_x,
int32_t  n_size 
)

Sort array.

Details
Sort array in ascending order (insertion sort algorithm)
Return values:
None

Definition at line 328 of file algorithm.cpp.

void maxim_sort_indices_descend ( int32_t *  pn_x,
int32_t *  pn_indx,
int32_t  n_size 
)

Sort indices.

Details
Sort indices according to descending order (insertion sort algorithm)
Return values:
None

Definition at line 346 of file algorithm.cpp.

Generated on Wed Jul 13 2022 11:29:51 by  doxygen 1.7.2