Posted on November 11, 2012 at 02:08Hello,
I am trying to implement a simple USART echo program but am running into communication problems between the discovery board and puTTy. When I transmit a character to the discovery board it does not respond. I have my serial adapters transmit line hooked up to a scope which is outputting an 8 bit value in accordance to the configuration of 4800 baud, 1 stop bit and no parity. However even though i can see a signal being sent to the STM i am not quite sure why it does not echo and send a character back.
the code I am currently executing is below
int main(void)
{
RCC_Configuration(); //clock initialize for usart2
//NVIC_Configuration();
GPIO_Configuration();//pins 2 and 3 configurationaaa
init_usart();
STM_EVAL_LEDInit(LED4);
STM_EVAL_LEDInit(LED5);
while(1)
{
uint16_t Data;
while(USART_GetITStatus(USART2,USART_IT_RXNE) == RESET) ;
// STM_EVAL_LEDToggle(LED4);
Data = USART_ReceiveData(USART2); // Collect Char
while(USART_GetITStatus(USART2,USART_IT_TXE)== RESET); // wait for empty
USART_SendData(USART2,Data); // defined in stm32f4xx_usart.h
}
}
I have even tried just putting USART_SendData(USART2,0x61) in the main while loop, but instead of the lower case a i should receive I am seeing an 'O' character in puTTy.
Please help me I dont know where I am going wrong!!!
#use-an-oscilloscope
