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How to use the other UART in sn8200(Discover Wi-Fi)?

Former Member

Hello,

I am a new in this conversation;

 

I have difficulty handling Discover Wi-Fi.

Currently, I am using keil vision and stm32f407 as a host mcu device

Also, I am trying to modify the example code but it is not working well. I need help and advice.

In the example, PB6 and PB7 are used to communicate with host mcu. Unfortunately, I have already assigned these pins to the another function. So I changed and tried several times such as UART1 to UART2, UART1 to UART3 and UART1 to UART1(PA9,PA10)

Surprisingly, It is only operated in PB6,PB7....

 

Does anybody know what happen in here and how to change it?

I tried the EWW website and others... it did not work..

 

I am really looking forward to meeting your answer.

 

Thanks

Parents

  • Can you first remove other things and just get demo working? That way we can eliminate hardware issues.

    Clem

  • in reply to clem57

    I checked the demo at first when I use it.

    I tested all the functions and it was working very well.

    Unfortunately, It doesn't work only for other UART function and I checked wiring between the mcu and wifi.

     

    Could you give me another solution for me?

     

    Thanks

     

    MJ

  • in reply to Former Member

    Can you post the changes to the demo only? Otherwise can you move your parts to other pins?

    Thanks,

    Clem

  • in reply to clem57

    Firstly, Thanks for reply.

    -For the software

    I changed below code. Below code is given and I changed USART1 --> USART2

    and pin assignment are changed to PA2 as a Tx and PA3 as a RX.

    Also UART CLOCK is changed APB2 --> APB1.

     

    -For the hardware

    I wired PA2 with   RX pin and PA3 with  SN8200SN8200 TXpin

    void SN8200_HAL_Init(uint32_t baudrate)

    {

        GPIO_InitTypeDef GPIO_InitStructure;

        USART_InitTypeDef USART_InitStructure;

        NVIC_InitTypeDef NVIC_InitStructure;

     

     

        /* Enable GPIO clock */

        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

     

     

        /* Enable UART clock */

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

     

     

     

     

        /* Connect PXx to USARTx_Tx*/

        GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1);

     

     

        /* Connect PXx to USARTx_Rx*/

        GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1);

     

     

        /* Configure USART Tx as alternate function  */

        GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

     

     

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

        GPIO_Init(GPIOB, &GPIO_InitStructure);

     

     

        /* Configure USART Rx as alternate function  */

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;

        GPIO_Init(GPIOB, &GPIO_InitStructure);

     

     

        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

     

     

        /* Enable the USART1 Interrupt */

        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NVIC_InitStructure);

     

     

        /* USART configuration */

        USART_InitStructure.USART_BaudRate = baudrate;

        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(USART1, &USART_InitStructure);

     

     

        USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

     

     

        /* Enable USART */

        USART_Cmd(USART1, ENABLE);

    }

     

     

     

     

    void SN8200_HAL_SendData(unsigned char *buf, int len)

    {

        int i;

     

     

        for (i = 0; i < len; i++) {

            USART_SendData(USART1, buf[i]);

            while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);

        }

    }

     

     

    bool SN8200_HAL_RxBufferEmpty(void)

    {

        return (RxBufferHead == RxBufferTail);

    }

     

     

    uint8_t SN8200_HAL_ReadByte(void)

    {

        uint8_t data = 0;

     

     

        if(RxBufferHead != RxBufferTail) {

            data = RxBuffer[RxBufferTail];

            RxBufferTail = (RxBufferTail + 1) % RX_BUFFER_SIZE;

        }

     

     

        return data;

    }

     

     

    void USART1_IRQHandler(void)

    {

        if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) {

            RxBuffer[RxBufferHead] = USART_ReceiveData(USART1);

            RxBufferHead = (RxBufferHead + 1) % RX_BUFFER_SIZE;

        }

    }

Reply
  • in reply to clem57

    Firstly, Thanks for reply.

    -For the software

    I changed below code. Below code is given and I changed USART1 --> USART2

    and pin assignment are changed to PA2 as a Tx and PA3 as a RX.

    Also UART CLOCK is changed APB2 --> APB1.

     

    -For the hardware

    I wired PA2 with   RX pin and PA3 with  SN8200SN8200 TXpin

    void SN8200_HAL_Init(uint32_t baudrate)

    {

        GPIO_InitTypeDef GPIO_InitStructure;

        USART_InitTypeDef USART_InitStructure;

        NVIC_InitTypeDef NVIC_InitStructure;

     

     

        /* Enable GPIO clock */

        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

     

     

        /* Enable UART clock */

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

     

     

     

     

        /* Connect PXx to USARTx_Tx*/

        GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1);

     

     

        /* Connect PXx to USARTx_Rx*/

        GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1);

     

     

        /* Configure USART Tx as alternate function  */

        GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

     

     

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

        GPIO_Init(GPIOB, &GPIO_InitStructure);

     

     

        /* Configure USART Rx as alternate function  */

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;

        GPIO_Init(GPIOB, &GPIO_InitStructure);

     

     

        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

     

     

        /* Enable the USART1 Interrupt */

        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NVIC_InitStructure);

     

     

        /* USART configuration */

        USART_InitStructure.USART_BaudRate = baudrate;

        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(USART1, &USART_InitStructure);

     

     

        USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

     

     

        /* Enable USART */

        USART_Cmd(USART1, ENABLE);

    }

     

     

     

     

    void SN8200_HAL_SendData(unsigned char *buf, int len)

    {

        int i;

     

     

        for (i = 0; i < len; i++) {

            USART_SendData(USART1, buf[i]);

            while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);

        }

    }

     

     

    bool SN8200_HAL_RxBufferEmpty(void)

    {

        return (RxBufferHead == RxBufferTail);

    }

     

     

    uint8_t SN8200_HAL_ReadByte(void)

    {

        uint8_t data = 0;

     

     

        if(RxBufferHead != RxBufferTail) {

            data = RxBuffer[RxBufferTail];

            RxBufferTail = (RxBufferTail + 1) % RX_BUFFER_SIZE;

        }

     

     

        return data;

    }

     

     

    void USART1_IRQHandler(void)

    {

        if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) {

            RxBuffer[RxBufferHead] = USART_ReceiveData(USART1);

            RxBufferHead = (RxBufferHead + 1) % RX_BUFFER_SIZE;

        }

    }

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