43 lines
1.9 KiB
Markdown
43 lines
1.9 KiB
Markdown
# 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)
|
|
|
|
|
|
# 2022-aug-29
|
|
|
|
Working on: Application 2 centre de mesures sensor oximeter 2.
|
|
|
|
- Il doit faire des mesures à la fréquence programmée.
|
|
- Possibilité de forcer une acquisition. Ce forcement démarre le cycle de mesure.
|
|
|
|
### To-do list for being able to read measurements from the oximeter 2
|
|
[x] Implement an i2c library for lpc55s16
|
|
[ ] Use the implemented i2c library to communication between lpc55s16 and Oximeter 2.
|
|
|
|
## 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")
|
|
|
|
## Oximeter 2
|
|
Oximeter 2 uses ADPD144RI for photoplethysmography detection of blood oxygenation.
|
|
|
|
### ADPD144RI
|
|
VDD1 and VDD2 pin = 1.8 V.
|
|
|
|
The 7-bit I 2 C slave address for the device is 0x64.
|
|
|
|
ADPD144RI doesn't have a 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)"* |