log day 1

README.md

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+# 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.
+
+## 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)"*

yu_scratch.md

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 # 2022-aug-29
-Oximeter 2
 
+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
+[] 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.