Fix errors.

Src/main.c

@@ -253,7 +253,7 @@ static void RTC_Init(void) {
 
   /* Wait for I2C */
   while ( I2C1->ISR & I2C_ISR_BUSY ) {};
-  I2C2->CR1 &= ~I2C_CR1_PE;
+  I2C1->CR1 &= ~I2C_CR1_PE;
 
   /* Fill buffer with register address and register value */
   i2cBufTX[0] = DS3231_CONTROL_ADDR;

Src/stm32g0xx_it.c

@@ -256,8 +256,8 @@ void TIM17_IRQHandler(void)
 {
   /* USER CODE BEGIN TIM17_IRQn 0 */
   /* check for NACK ??? */
-  if ( (I2C2->ISR & I2C_ISR_NACF) != 0 ) {
-    I2C->ICR |= I2C_ICR_NACKCF;
+  if ( (I2C1->ISR & I2C_ISR_NACKF) != 0 ) {
+    I2C1->ICR |= I2C_ICR_NACKCF;
     IN15_Percent;
   }
   /* USER CODE END TIM17_IRQn 0 */