l wanna blink an LED at a rate of 2 Hz until ,so what kind of code should i add

#include #include #include "eecs388_lib.h"

volatile int intr_count;

#define MAX_INTERRUPTS 16 void (*interrupt_handler[MAX_INTERRUPTS])(); void (*exception_handler[MAX_INTERRUPTS])();

void handle_trap(void) __attribute((interrupt)); void handle_trap() { unsigned long mcause = read_csr(mcause); if (mcause & MCAUSE_INT) { printf("interrupt. cause=%d, count=%d ", mcause & MCAUSE_CAUSE, (int)intr_count); // mask interrupt bit and branch to handler interrupt_handler[mcause & MCAUSE_CAUSE] (); } else { printf("exception=%d ", mcause & MCAUSE_CAUSE); // synchronous exception, branch to handler exception_handler[mcause & MCAUSE_CAUSE](); } }

void timer_handler() { intr_count++;

// YOUR CODE HERE set_cycles(get_cycles()+2000*32768/1000); }

void enable_timer_interrupt() { write_csr(mie, read_csr(mie) | (1 << MIE_MTIE_BIT)); }

void enable_interrupt() { // YOUR CODE HERE write_csr(mstatus, read_csr(mstatus)|(1< }

void disable_interrupt() { // YOUR CODE HERE write_csr(mstatus,read_csr(mstatus)&~(1< }

void register_trap_handler(void *func) { write_csr(mtvec, ((unsigned long)func)); }

int main (void) { int led_idx = 0; int led_gpio[] = {BLUE_LED, GREEN_LED}; for (int i = 0; i < 2; i++) gpio_mode(led_gpio[i], OUTPUT);

// install timer interrupt handler interrupt_handler[7] = timer_handler;

// write handle_trap address to mtvec register_trap_handler(handle_trap);

// enable timer interrupt enable_timer_interrupt();

// cause timer interrupt set_cycles(0);

// enable global interrupt enable_interrupt();

// main loop. int val = 0; char angle = 0; int prev_intr_count = intr_count; while(1) { disable_interrupt(); if (prev_intr_count != intr_count) { // toggle led on/off on a new interrupt val ^= 1; gpio_write(led_gpio[led_idx], val); prev_intr_count = intr_count; } If (intr_count >= 2)

{

if (angle >- 10||angle <10) { gpio_write(led_gpio[led_idx], OFF); }

else if(angle <- 10) { printf("count=%d. reset ", (int)intr_count); intr_count = 0; gpio_write(led_gpio[led_idx], ON); led_idx = (led_idx + 1) % 2; } else if (angle >10) { printf("count=%d. reset ", (int)intr_count); intr_count = 0; gpio_write(led_gpio[led_idx], ON); led_idx = (led_idx + 1) % 2; } } } enable_interrupt(); } return 0; }