# 2022-août-30

L'objectif du jour: Lire un registre de l'oximètre via I2C. (sans succès)


# 2022-09-05

##### yu-capteurs branch in function "oximeter2_read_data" optimisation

**Context:**
The library "oximeter2.h" on branch yu-capteurs is essentially the same thing as the [example code](https://github.com/MikroElektronika/mikrosdk_click_v2/blob/master/clicks/oximeter2/example/main.c) from the official github repo of MikroElektronika except a few modifications. 

There are modifications because the cod on this gitlab branch yu doesn't use the "drv" libraries. The code connecting the drivers of the [nxp mcu sdk](https://github.com/NXPmicro/mcux-sdk/blob/main/drivers/i2c/fsl_i2c.h) and the example code provided by mikroelektronika has to be reinvened.

**Problem/Confusion:**

The function oximeter2_read_data from the MikroElektro official oximeter2 library has 4 register value catchers catching readings from the 4 channels(PD_{1,2,3,4}). 

I received warnings of "variable 'reg_addr{1,3}' set but not used". 

Will removing these two variables affecting anything?

# 2022-août-29

L'objectif du jour: Découvrir le capteur oximètre 2 qui est une partie d'une LPC55S16 d'application 2 "centre de mesures".

- Le LPC55S16 "doit faire des mesures à la fréquence programmée" via l'oximètre connecté.
- Possibilité de forcer une acquisition. Ce forcement démarre le cycle de mesure.
    - Probablement forcer depuis le tableau de bord.

### To-do list for being able to read measurements from the oximeter 2
[x] Familiariser avec la bibliothèque d'i2c "fsl_i2c.h".

[ ] Implémenter la communcation entre le LPC55S16 et l'oximètre 2 en utilisant cette bibliothèque.

<details>
<summary style="font-size:14px"> CLICK ME IF YOU ARE CURIOUS </summary>
<p>


## LPC55S16-EVK setup
> "The I2C interface of the codec is routed to Flexcomm 4 of the LPC55Sxx, the same connection as used for the other I2C devices on the board." (from "LPCXpresso55S16 Development Boards User Manual")

Donc "I2C_MasterTransferCreateHandle(I2C4, &a_i2c_master_handle_t, i2c_master_callback, NULL);"

## Oximeter 2
Oximeter 2 utilise l'ADPD144RI pour la détection par photopléthysmographie de l'oxygénation du sang.

### ADPD144RI

Son adresse d'esclave est 0x64.

Il n'a pas un who_am_i.

> The ADPD144RI samples bursts of synchronous pulses in two independent time slots, Time Slot A and Time Slot B, which occur sequentially within a sample period. 

> A burst accumulator sums the pulse energies into a 20-bit value. The number of pulses in each time slot is set in the top octet of Register 0x31 for Time Slot A and Register 0x36 for Time Slot B. Each time slot can contain 1 to 255 pulses.

#### Les Registres Importants
![Example_SpO2_Setup_File](./img/Example_SpO2_Setup_File.png)
*Page 22 de 34 de "ADPD144RI(Rev.A)"*


</p></details>

# Useful Tutorials from the Official nxp website

- [AN12805 Establish Secure Connection with Private Cloud](https://www.nxp.com/docs/en/application-note/AN12805.pdf)

    - [Internal link for AN12805 Establish Secure Connection with Private Cloud](./tuto/AN12805.pdf)

Keywords: secure TLS; WiFi; MQTT; openssl; Mosquitto

- [LPC55S00 Security Solutions for IoT](https://www.nxp.com/docs/en/application-note/AN12278.pdf)
    - [Internal link for LPC55S00 Security Solutions for IoT](./tuto/AN12278.pdf)