[STM32] Make most of the I2C code into a common file

Since most of the code in i2c_api.c is now relying on STM32 HAL, there
is now a possibility to make a common usage of this code accross families.

The IP version definition is introduced per family, to allow a switch of
functionnalities, especially the frequency management which differs.
BTw, we fix the F0 frequency settings at the same time.

F1 is managed for now as an exception as the HAL API for sequential transmit
/receive is not yet available (coming soon)

Author: LMESTM

targets/TARGET_STM/TARGET_STM32F0/TARGET_DISCO_F051R8/objects.h

@@ -66,10 +66,6 @@ struct dac_s {
     uint32_t channel;
 };
 
-struct i2c_s {
-    I2CName  i2c;
-};
-
 #include "common_objects.h"
 #include "gpio_object.h"
 

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F030R8/objects.h

@@ -60,10 +60,6 @@ struct analogin_s {
     uint32_t channel;
 };
 
-struct i2c_s {
-    I2CName  i2c;
-};
-
 #include "common_objects.h"
 #include "gpio_object.h"
 

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F031K6/objects.h

@@ -60,10 +60,6 @@ struct analogin_s {
     uint32_t channel;
 };
 
-struct i2c_s {
-    I2CName  i2c;
-};
-
 #include "common_objects.h"
 #include "gpio_object.h"
 

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F042K6/objects.h

@@ -60,10 +60,6 @@ struct analogin_s {
     uint32_t channel;
 };
 
-struct i2c_s {
-    I2CName  i2c;
-};
-
 struct can_s {
     CANName can;
     int index;

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F070RB/objects.h

@@ -60,10 +60,6 @@ struct analogin_s {
     uint32_t channel;
 };
 
-struct i2c_s {
-    I2CName  i2c;
-};
-
 #include "common_objects.h"
 #include "gpio_object.h"
 

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F072RB/objects.h

@@ -66,10 +66,6 @@ struct dac_s {
     uint32_t channel;
 };
 
-struct i2c_s {
-    I2CName  i2c;
-};
-
 struct can_s {
     CANName can;
     int index;

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F091RC/objects.h

@@ -66,10 +66,6 @@ struct dac_s {
     uint32_t channel;
 };
 
-struct i2c_s {
-    I2CName  i2c;
-};
-
 struct can_s {
     CANName can;
     int index;

targets/TARGET_STM/TARGET_STM32F0/common_objects.h

@@ -82,6 +82,34 @@ struct serial_s {
 #endif
 };
 
+struct i2c_s {
+    /*  The 1st 2 members I2CName i2c
+     *  and I2C_HandleTypeDef handle should
+     *  be kept as the first members of this struct
+     *  to ensure i2c_get_obj to work as expected
+     */
+    I2CName  i2c;
+    I2C_HandleTypeDef handle;
+    uint8_t index;
+    int hz;
+    PinName sda;
+    PinName scl;
+    IRQn_Type event_i2cIRQ;
+    IRQn_Type error_i2cIRQ;
+    uint32_t XferOperation;
+    volatile uint8_t event;
+#if DEVICE_I2CSLAVE
+    uint8_t slave;
+    volatile uint8_t pending_slave_tx_master_rx;
+    volatile uint8_t pending_slave_rx_maxter_tx;
+#endif
+#if DEVICE_I2C_ASYNCH
+    uint32_t address;
+    uint8_t stop;
+    uint8_t available_events;
+#endif
+};
+
 #include "gpio_object.h"
 
 #ifdef __cplusplus