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Two USARTs

Question asked by pedersen.michael.002 on Feb 7, 2014
Latest reply on Feb 10, 2014 by pedersen.michael.002
Hi,

I am trying to use two USARTs at the same time, but I can't get it to work.

First:

void RCC_Configuration(void)
{
  /* USART1 clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);


  /* USART2 clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);


  /* GPIOA clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
}

Then:

void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;


  /* GPIO Configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);


  /* Connect USART pins to AF */
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_7);   // USART1_TX
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_7);  // USART1_RX


  /* GPIO Configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);


  /* Connect USART pins to AF */
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_7);   // USART2_TX
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_7);  // USART2_RX
}

And finally:

void USART1_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;


  /* USARTx configuration ------------------------------------------------------*/
  /* USARTx configured as follow:
        - BaudRate = 115200 baud
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = 115200; //115200;
  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_Cmd(USART1, ENABLE);
}


void USART2_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;


  /* USARTx configuration ------------------------------------------------------*/
  /* USARTx configured as follow:
        - BaudRate = 115200 baud
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = 115200; //115200;
  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(USART2, &USART_InitStructure);


  USART_Cmd(USART2, ENABLE);
}

And of cause i am calling them all from main:

  RCC_Configuration();


  GPIO_Configuration();


  USART1_Configuration();


  USART2_Configuration();

But I can only send data via USART 1... What can be wrong?!

Kind regards,
Michael

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