SMT32 I2C: initialize clock before configuring PINs

This is needed especially for F1 family but can apply to all.

Author: LMESTM

targets/TARGET_STM/i2c_api.c

@@ -203,70 +203,70 @@ void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
     // Enable I2C1 clock and pinout if not done
     if (obj_s->i2c == I2C_1) {
         obj_s->index = 0;
+        __HAL_RCC_I2C1_CLK_ENABLE();
         // Configure I2C pins
         pinmap_pinout(sda, PinMap_I2C_SDA);
         pinmap_pinout(scl, PinMap_I2C_SCL);
         pin_mode(sda, PullUp);
         pin_mode(scl, PullUp);
         obj_s->event_i2cIRQ = I2C1_EV_IRQn;
         obj_s->error_i2cIRQ = I2C1_ER_IRQn;
-        __HAL_RCC_I2C1_CLK_ENABLE();
     }
 #endif
 #if defined I2C2_BASE
     // Enable I2C2 clock and pinout if not done
     if (obj_s->i2c == I2C_2) {
         obj_s->index = 1;
+        __HAL_RCC_I2C2_CLK_ENABLE();
         // Configure I2C pins
         pinmap_pinout(sda, PinMap_I2C_SDA);
         pinmap_pinout(scl, PinMap_I2C_SCL);
         pin_mode(sda, PullUp);
         pin_mode(scl, PullUp);
         obj_s->event_i2cIRQ = I2C2_EV_IRQn;
         obj_s->error_i2cIRQ = I2C2_ER_IRQn;
-        __HAL_RCC_I2C2_CLK_ENABLE();
     }
 #endif
 #if defined I2C3_BASE
     // Enable I2C3 clock and pinout if not done
     if (obj_s->i2c == I2C_3) {
         obj_s->index = 2;
+        __HAL_RCC_I2C3_CLK_ENABLE();
         // Configure I2C pins
         pinmap_pinout(sda, PinMap_I2C_SDA);
         pinmap_pinout(scl, PinMap_I2C_SCL);
         pin_mode(sda, PullUp);
         pin_mode(scl, PullUp);
         obj_s->event_i2cIRQ = I2C3_EV_IRQn;
         obj_s->error_i2cIRQ = I2C3_ER_IRQn;
-        __HAL_RCC_I2C3_CLK_ENABLE();
     }
 #endif
 #if defined I2C4_BASE
     // Enable I2C3 clock and pinout if not done
     if (obj_s->i2c == I2C_4) {
         obj_s->index = 3;
+        __HAL_RCC_I2C4_CLK_ENABLE();
         // Configure I2C pins
         pinmap_pinout(sda, PinMap_I2C_SDA);
         pinmap_pinout(scl, PinMap_I2C_SCL);
         pin_mode(sda, PullUp);
         pin_mode(scl, PullUp);
         obj_s->event_i2cIRQ = I2C4_EV_IRQn;
         obj_s->error_i2cIRQ = I2C4_ER_IRQn;
-        __HAL_RCC_I2C4_CLK_ENABLE();
     }
 #endif
 #if defined FMPI2C1_BASE
     // Enable I2C3 clock and pinout if not done
     if (obj_s->i2c == FMPI2C_1) {
         obj_s->index = 4;
+        __HAL_RCC_FMPI2C1_CLK_ENABLE();
         // Configure I2C pins
         pinmap_pinout(sda, PinMap_I2C_SDA);
         pinmap_pinout(scl, PinMap_I2C_SCL);
         pin_mode(sda, PullUp);
         pin_mode(scl, PullUp);
         obj_s->event_i2cIRQ = FMPI2C1_EV_IRQn;
         obj_s->error_i2cIRQ = FMPI2C1_ER_IRQn;
-        __HAL_RCC_FMPI2C1_CLK_ENABLE();
     }
 #endif