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STM32 USART can send but not receive on Putty

Question asked by M on Aug 27, 2015
Latest reply on Aug 27, 2015 by M
Hi all, I'm very new to this so please bear with me.

I'm using STM32L053 Nucleo and I set up normal polling USART to COM4 of the PC. 
I can send data to the serial monitor (PuTTy) but I can't receive anything back from PuTTy. 


When I try to type on PuTTy it doesn't seem to register anything, but since I can send I'm assuming that my USART is set up correctly..


In my main:


     char *msg = "Press a key.\n\r";
     HAL_UART_Transmit(&huart2, (uint8_t*)msg, strlen(msg), 0xFFFF);
     
     HAL_UART_Receive(&huart2, (char*)c, strlen((char*)c), 0xFFFF);
     HAL_UART_Transmit(&huart2, (uint8_t*)endl, strlen(endl), 0xFFFF);
     msg = "You pressed this key: ";
     HAL_UART_Transmit(&huart2, (uint8_t*)msg, strlen(msg), 0xFFFF);


The serial monitor prints out the following, and no matter what I press it makes no difference:


>> Press a key.


>> You pressed this key:


This is how I intialised USART:




    /* USART2 init function */
    void MX_USART2_UART_Init(void)
    {
    
      huart2.Instance = USART2;
      huart2.Init.BaudRate = 9600;
      huart2.Init.WordLength = UART_WORDLENGTH_8B;
      huart2.Init.StopBits = UART_STOPBITS_1;
      huart2.Init.Parity = UART_PARITY_NONE;
      huart2.Init.Mode = UART_MODE_TX_RX;
      huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
      huart2.Init.OverSampling = UART_OVERSAMPLING_16;
      huart2.Init.OneBitSampling = UART_ONEBIT_SAMPLING_DISABLED;
      huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
      HAL_UART_Init(&huart2);
    
    }


    /* Initialise USART MSP */
    void HAL_UART_MspInit(UART_HandleTypeDef* huart)
    {
      GPIO_InitTypeDef GPIO_InitStruct;
      if(huart->Instance==USART2)
      {
        /* Peripheral clock enable */
        __USART2_CLK_ENABLE();
      
        /**USART2 GPIO Configuration    
        PA2     ------> USART2_TX
        PA3     ------> USART2_RX 
        */
        GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Pull = GPIO_PULLUP;
        GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
        GPIO_InitStruct.Alternate = GPIO_AF4_USART2;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
      }   
    }


At this point I'm not sure if it's the code, the PuTTy setting, or the hardware. Any suggestion is appreciated. Thanks!

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