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STM32F105RC UART problem

Question asked by wei.andy.003 on Oct 5, 2015
Latest reply on Oct 5, 2015 by Clive One
Hi, I'm currently working with STM32F105RC chip and trying to use UART4 (PC10 and PC11), which connects to a USB to UART module to a computer.  The problem is, I'm not getting any readings from PC using hyperterminal.

/******** Declare USART、GPIO structure ********/
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    /******** Activate GPIOC、UART4 RCC clock ********/
    //RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_USART1, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); //clock a PORTC
    RCC_APB2PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE); //clock alla UART4!
    /******** Setup PC10 for Tx ********/
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOC, &GPIO_InitStructure); // Initialize PC10
    /******** Setup PC11 for Rx ********/
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOC, &GPIO_InitStructure); // Initialize PC11
    /******** USART parameter ********/
    USART_InitStructure.USART_BaudRate = 9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(UART4, &USART_InitStructure); // Initialize UART4
    USART_Cmd(UART4, ENABLE); // Activate  USART4
    USART_SendData(UART4, 'a'); // Send data