Posted on April 01, 2013 at 17:16Folks
Here is the interrupt code that works for me:-
extern ''C'' void USART1_IRQHandler(void)
{
// check if the USART1 receive interrupt flag was set
if (USART_GetITStatus(USART1, USART_IT_RXNE ))
{
static uint8_t cnt = 0; // this counter is used to determine the string length
char t = USART1 ->DR; // the character from the USART1 data register is saved in t
/* check if the received character is not the LF character (used to determine end of string)
* or the if the maximum string length has been been reached
*/
if ((t != '\n') && (cnt < MAX_STRLEN))
{
received_string[cnt] = t;
cnt++;
}
else
{ // otherwise reset the character counter and print the received string
cnt = 0;
USART_puts(USART1, received_string);
}
}
}
and also I've changed the USART_puts function to:-
void USART_puts(USART_TypeDef* USARTx, volatile char *s)
{
while ((*s) && (*s != '\n') && (*s != '\r')) // loop until you get to the end of the string
{
// wait until data register is empty
while (!(USARTx->SR & 0x00000040)) ; // no body to this while just waiting for the buffer to be free
USART_SendData(USARTx, *s);
s++;
}
while (!(USARTx->SR & 0x00000040))
; // waiting for the buffer to be free
USART_SendData(USARTx, '\r');
while (!(USARTx->SR & 0x00000040))
; // waiting for the buffer to be free
USART_SendData(USARTx, '\n');
// void USART_SendData(USART_TypeDef* USARTx, uint16_t Data);
}
Now on to getting USART2 working......
