STM32f429zi usart interrupts

[RMang.1]

Hi guys hope you are doing well, I am having some issues generating a USART Interrupt to receive data in my project using the Standard Peripheral Library not HAL...I wanted to ask if there is someone who might have a simple code based on usart interrupts, my code here

https://pastebin.com/h4fTQGKT

[Tesla DeLorean]

if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET){

    USART_ClearFlag(USART3, USART_FLAG_RXNE); // <<<< Don't need this, the read will implicitly clear the status/interrupt

    rxByte = USART_ReceiveData(USART3);

Should perhaps also have code to check parity, framing, noise error and clear those.

Does transmit work? Check HSE_VALUE setting

// STM32 USART IRQ TX/RX Loop (USART3 Tx PD.8, Rx PD.9) STM32F4 Discovery - sourcer32@gmail.com
 
#include "stm32f4_discovery.h"
 
volatile char StringLoop[] = "The quick brown fox jumps over the lazy dog\r\n";
 
/**************************************************************************************/
 
void RCC_Configuration(void)
{
  /* --------------------------- System Clocks Configuration -----------------*/
  /* USART3 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
 
  /* GPIOD clock enable */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
}
 
/**************************************************************************************/
 
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
 
  /*-------------------------- GPIO Configuration ----------------------------*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
  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(GPIOD, &GPIO_InitStructure);
 
  /* Connect USART pins to AF */
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource8, GPIO_AF_USART3);
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource9, GPIO_AF_USART3);
}
 
/**************************************************************************************/
 
void USART3_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;
 
  /* USARTx configuration ------------------------------------------------------*/
  /* USARTx configured as follow:
        - BaudRate = 9600 baud
        - Word Length = 8 Bits
        - Two Stop Bit
        - Odd parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  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(USART3, &USART_InitStructure);
 
  USART_Cmd(USART3, ENABLE);
 
  USART_ITConfig(USART3, USART_IT_RXNE | USART_IT_TXE, ENABLE);
}
 
/**************************************************************************************/
 
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
 
  /* Configure the NVIC Preemption Priority Bits */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
 
  /* Enable the USART3 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}
 
/**************************************************************************************/
 
void USART3_IRQHandler(void)
{
  static int tx_index = 0;
  static int rx_index = 0;
 
  if (USART_GetITStatus(USART3, USART_IT_TXE) != RESET) // Transmit the string in a loop
  {
    USART_SendData(USART3, StringLoop[tx_index++]);
 
    if (tx_index >= (sizeof(StringLoop) - 1))
      tx_index = 0;
  }
 
  if (USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) // Received characters modify string
  {
    StringLoop[rx_index++] = USART_ReceiveData(USART3);
 
    if (rx_index >= (sizeof(StringLoop) - 1))
      rx_index = 0;
  }
}
 
/**************************************************************************************/
 
int main(void)
{
  RCC_Configuration();
 
  GPIO_Configuration();
 
  NVIC_Configuration();
 
  USART3_Configuration();
 
  while(1); // Don't want to exit
}
 
/**************************************************************************************/
 
#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
 
  /* Infinite loop */
  while (1)
  {
  }
}
#endif
 
/**************************************************************************************/