Posted on November 09, 2015 at 08:46Indeed it is not my goal to switch a led on in the interrupt routine, it was only a test to check if I entered in the toutine.
What I need is, every time a new charcater arrives, catch it and put it in an buffer for futher elaboration.
More or less the routine is like this:
=====================================================
extern ''C'' void USART1_IRQHandler()
{
myusart.PrintString((uint8_t *) ''\n\nUSART INTERRUPT\n'', 0); // I am entering in the routine
if(USART1->ISR & USART_ISR_RXNE)
{
if(iocnt < 500)
{
if(c != '\n')
{
iobuf[iocnt++] = c;
iobuf[iocnt] = 0;
}
else
{
iobuf[iocnt] = 0; // redundant instruction
iocnt = 0;
}
}
}
// USART1->RQR |= 0x00000008;
USART1->ICR = 0x00020A5F;
return;
}
=====================================================
Enabling NVIC interrupt is working, but still I encounter some problems:
- Interrupt bit should clear when I read ISR register, but it doesn't
- Interrupt bit should clear when I set RXRFQ bit in RQR register, but it doesn't
The only way I found to clear interrupt is to set bits in ICR register and, furthermore, only the first carachter of input string is read.
Do I have to increase sysclock frequency?
(it is sysclock = 8 MHz and baud rate = 115200)
Thank you
Freya
