Not able to "Receive" data via UART on STM32f429-disco

[sk12]

hello guys, 
i am using a FTDI FT232B17 for serial communicaiton with my stm32f429 board. i'm using keil uvision, and not using any libraries other than stm32f429xx.h to write the code. i am facing problems "receiving" data from the ftdi-ft232 to my STM32 board. i have successfully sent data from stm32f429 and am able to see it on tera-term/real-term etc, but i am not able to echo or receive data, any ideas where it could be wrong? i have double checked my hardware connections. while running the program when i click "send" from the Real-term, light blinks on the ft232 board but unfortunately nothing is received on stm32.

[AScha.3]

Hi,

>any ideas where it could be wrong?

in your program ...

or hardware: did you check with scope, data coming to F429 rx pin ?

+ Which uart ? Did you check, nothing connected on your board to the rx pin ?

[sk12]

i toggled the on-board LED on my code to find where i am wrong, it turns out 

unsigned char UART4_read(void) {

    // working led_tog();

/*problem*/ while (!(UART4->SR & USART_SR_RXNE)) {

//here LED toggling continuously in loop led_tog();} 

    //not togling led_tog();

return UART4->DR; 

}

it turns out it is stuck in 'while (!(UART4->SR & USART_SR_RXNE))' loop and not accepting any data even after me sending it through the real-term application, setting the SAME baud rate and all other parameters like stop bits etc. 
the issue got to be with the TX pin(PA0) on-board connected to RX of the ft232, either the TX Pin on ft232 is damaged or could be the wire.. are the most visible problems to me when i think about it.. what could it be?

[Tesla DeLorean]

Make sure to clear any pending errors on the UART, so noise, framing type errors.

The STM32F429I-DISCO likely to have very few unconflicted pins.

Provide a wiring diagram and initialization code for clocks, pins and peripheral. 

char InChar(void)
{
  while((USART_RS232->SR & USART_SR_RXNE) == 0) // Wait for Char
  {
    if (USART_RS232->SR & (USART_SR_PE | USART_SR_FE | USART_SR_NE | USART_SR_ORE)) // Check/Clear Errors
      USART_RS232->DR;
  }
  return((char)USART_RS232->DR); // Read Char
}

[sk12]

not working, the RXNE bit is the problem and i don't know why its not getting low and the while loop isn't moving forward. everything else works,as i said, i am able to send the data from the microcontroller with the same setup but not receive.

[sk12 · Accepted solution]

guys turns out, PA0 and PA1 didnt work because of being connected to the RAM and they were pulled low, i check with the oscilloscope if the signal was received on PA1, it was indeed but since it was pulled low, i used a different port, PC10 and PC11 which did work