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#include <stdio.h>
#include <metal/cpu.h>
#include <metal/led.h>
#include <metal/button.h>
#include <metal/switch.h>
#define RTC_FREQ 32768
struct metal_cpu *cpu0;
struct metal_interrupt *cpu_intr, *tmr_intr;
int tmr_id;
volatile uint32_t timer_isr_flag;
void display_banner (void) {
printf("\n");
printf("\n");
printf(" SIFIVE, INC.\n");
printf("\n");
printf(" 5555555555555555555555555\n");
printf(" 5555 5555\n");
printf(" 5555 5555\n");
printf(" 5555 5555\n");
printf(" 5555 5555555555555555555555\n");
printf(" 5555 555555555555555555555555\n");
printf(" 5555 5555\n");
printf(" 5555 5555\n");
printf(" 5555 5555\n");
printf(" 5555555555555555555555555555 55555\n");
printf(" 55555 555555555 55555\n");
printf(" 55555 55555 55555\n");
printf(" 55555 5 55555\n");
printf(" 55555 55555\n");
printf(" 55555 55555\n");
printf(" 55555 55555\n");
printf(" 55555 55555\n");
printf(" 55555 55555\n");
printf(" 555555555\n");
printf(" 55555\n");
printf(" 5\n");
printf("\n");
printf("\n");
printf("Welcome to the E31/E51 Coreplex IP FPGA Evaluation Kit!\n");
}
void timer_isr (int id, void *data) {
// Disable Timer interrupt
metal_interrupt_disable(tmr_intr, tmr_id);
// Flag showing we hit timer isr
timer_isr_flag = 1;
}
void wait_for_timer(struct metal_led *which_led) {
// clear global timer isr flag
timer_isr_flag = 0;
// Turn on desired LED
metal_led_on(which_led);
// Set timer
metal_cpu_set_mtimecmp(cpu0, metal_cpu_get_mtime(cpu0) + RTC_FREQ);
// Enable Timer interrupt
metal_interrupt_enable(tmr_intr, tmr_id);
// wait till timer triggers and isr is hit
while (timer_isr_flag == 0){};
timer_isr_flag = 0;
// All Off
metal_led_off(which_led);
}
int main (void)
{
int rc, up_cnt, dn_cnt;
struct metal_led *led0_red, *led0_green, *led0_blue;
// This demo will toggle LEDs colors so we define them here
led0_red = metal_led_get_rgb("LD0", "red");
led0_green = metal_led_get_rgb("LD0", "green");
led0_blue = metal_led_get_rgb("LD0", "blue");
if ((led0_red == NULL) || (led0_green == NULL) || (led0_blue == NULL)) {
printf("At least one of LEDs is null.\n");
return 1;
}
// Enable each LED
metal_led_enable(led0_red);
metal_led_enable(led0_green);
metal_led_enable(led0_blue);
// All Off
metal_led_off(led0_red);
metal_led_off(led0_green);
metal_led_off(led0_blue);
// Lets get the CPU and and its interrupt
cpu0 = metal_cpu_get(0);
if (cpu0 == NULL) {
printf("CPU null.\n");
return 2;
}
cpu_intr = metal_cpu_interrupt_controller(cpu0);
if (cpu_intr == NULL) {
printf("CPU interrupt controller is null.\n");
return 3;
}
metal_interrupt_init(cpu_intr);
// display welcome banner
display_banner();
// Setup Timer and its interrupt so we can toggle LEDs on 1s cadence
tmr_intr = metal_cpu_timer_interrupt_controller(cpu0);
if (tmr_intr == NULL) {
printf("TIMER interrupt controller is null.\n");
return 4;
}
metal_interrupt_init(tmr_intr);
tmr_id = metal_cpu_timer_get_interrupt_id(cpu0);
rc = metal_interrupt_register_handler(tmr_intr, tmr_id, timer_isr, cpu0);
if (rc < 0) {
printf("TIMER interrupt handler registration failed\n");
return (rc * -1);
}
// Lastly CPU interrupt
if (metal_interrupt_enable(cpu_intr, 0) == -1) {
printf("CPU interrupt enable failed\n");
return 6;
}
// Red -> Green -> Blue, repeat
while (1) {
// Turn on RED
wait_for_timer(led0_red);
// Turn on Green
wait_for_timer(led0_green);
// Turn on Blue
wait_for_timer(led0_blue);
}
// return
return 0;
}
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