3.2 KiB
2022-août-30
L'objectif du jour: Lire un registre de l'oximètre via I2C. (sans succès)
2022-09-05
Context: The library "oximeter2.h" on branch yu-capteurs is essentially the same thing as the example code 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 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.
CLICK ME IF YOU ARE CURIOUS
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
Page 22 de 34 de "ADPD144RI(Rev.A)"
Useful Tutorials from the Official nxp website
Keywords: secure TLS; WiFi; MQTT; openssl; Mosquitto