I2C problem with STM32F103

This STM32F103 project will have a 4x20 LCD, needs two PWM ouptuts, and I2C interface to a Si5351A and several external interrupts. I started developing the interface to the LCD; no problem,then the two PWM's; again no problem but I cannot get the I2C interface to work. The two lines, SDA and SCL show no activity on an oscilloscope and calls to HAL_I2C_Master_Transmit() just return a HAL_BUSY. Looking at the code generated, I'm surprised to see that the MX_GPIO_Init() routine does not show any configuration of the two I2C lines; PB6 and PB7 although a MX_I2C1_Init() is generated.

static void MX_GPIO_Init(void)
{
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 
 /* GPIO Ports Clock Enable */
 __HAL_RCC_GPIOC_CLK_ENABLE();
 __HAL_RCC_GPIOD_CLK_ENABLE();
 __HAL_RCC_GPIOA_CLK_ENABLE();
 __HAL_RCC_GPIOB_CLK_ENABLE();
 
 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET);
 
 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(GPIOB, D2_Pin|D3_Pin|E_Pin|RS_Pin 
 |D0_Pin|D1_Pin, GPIO_PIN_RESET);
 
 /*Configure GPIO pin : LD2_Pin */
 GPIO_InitStruct.Pin = LD2_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(LD2_GPIO_Port, &GPIO_InitStruct);
 
 /*Configure GPIO pins : D2_Pin D3_Pin E_Pin RS_Pin 
 D0_Pin D1_Pin */
 GPIO_InitStruct.Pin = D2_Pin|D3_Pin|E_Pin|RS_Pin 
 |D0_Pin|D1_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
}

static void MX_I2C1_Init(void)
{
 
 /* USER CODE BEGIN I2C1_Init 0 */
 
 /* USER CODE END I2C1_Init 0 */
 
 /* USER CODE BEGIN I2C1_Init 1 */
 
 /* USER CODE END I2C1_Init 1 */
 hi2c1.Instance = I2C1;
 hi2c1.Init.ClockSpeed = 100000;
 hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
 hi2c1.Init.OwnAddress1 = 0;
 hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
 hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
 hi2c1.Init.OwnAddress2 = 0;
 hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
 hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
 if (HAL_I2C_Init(&hi2c1) != HAL_OK)
 {
 Error_Handler();
 }
 
 /* USER CODE BEGIN I2C1_Init 2 */
 
 /* USER CODE END I2C1_Init 2 */
 
}