update problem log

README.md

@@ -1,6 +1,20 @@
-# 2022-août-30
+# 2022-09-06
 
-L'objectif du jour: Lire un registre de l'oximètre via I2C. (sans succès)
+**Problem/Confusion:**
+
+The yu-capteurs version of function i2c_master_write doesn't transfer nonblockingly correctly. The return value of `I2C_MasterTransferNonBlocking(EXAMPLE_I2C_MASTER, &g_m_handle, masterXfer)` is not `kStatus_Success`.
+
+[Link](https://githepia.hesge.ch/guoguo.yu/centre-medical-connecte/-/blob/yu-capteurs/project/oximetre/source/oximeter2.c#L103)
+
+Several things could be the cause of it:
+- Badly configured masterXfer variable
+- Badly configured handler g_m_handle
+  - `extern` not done properly maybe? maybe I should use `static`?
+- `EXAMPLE_I2C_MASTER` incorrect
+
+After modifying the oximeter2_init function and changing the EXAMPLE_I2C_MASTER's MSDAT value to 0x46(the correct value), the value goes back to the previous wrong value after `I2C_MasterTransferNonBlocking` in `i2c_master_write`.
+
+Another observation is that the value `final_result` read in function oximeter2_logs_results is always 92, regardless if the click sensor oximeter2 is connected to the board or not.
 
 
 # 2022-09-05
@@ -20,6 +34,10 @@ I received warnings of "variable 'reg_addr{1,3}' set but not used".
 
 Will removing these two variables affecting anything?
 
+# 2022-août-30
+
+L'objectif du jour: Lire un registre de l'oximètre via I2C. (sans succès)
+
 # 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".