Those who have used assembly language know that in assembly language, the instruction reti is used to return from the interrupt service routine. Then in winavr we use C to write a program like this:
#include
…
ISR(USART_RXC_vect)
{
uart_putc('a');
while(!(UCSRA&(1< char dummy = UDR; flag = !flag; uart_putc_hex(flag); reti(); } … int main(void) { uart_init(); uart_putstring("starting\r\n"); //send data to PC sei(); while(1) { … } } Run the program and you will find that as long as you send characters from the serial port assistant to the microcontroller, it will output a line: “starting” This means that every time you return from an interrupt, the program is restarted. Who restarted it? After debugging, I found that it was restarted by reti(). I was stunned. It turns out that it not only simply returns from an interrupt, but also restarts the entire program. Keep this in mind.
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