main.c

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#include <stdint.h>
 
#include "ra8_attributes.h"
#include "ra8_board_ek_ra8d2.h"
#include "ra8_boot_entry.h"
#include "ra8_cgc.h"
#include "ra8_err.h"
#include "ra8_isr.h"
#include "ra8_iwdt.h"
#include "ra8_time.h"

typedef enum : uint32_t {
  k_iwdt_demo_baud    = 115200U, 
  k_iwdt_demo_poll_ms = 50U,     
} iwdt_demo_const_t;

typedef enum : uint16_t {
  k_iwdt_demo_window_low  = 0x0400U, 
  k_iwdt_demo_window_high = 0x0C00U, 
} iwdt_demo_window_t;
 
static const uint8_t s_iwdt_demo_msg_refresh[] = "iwdt: refresh in window\r\n";
static const uint8_t s_iwdt_demo_msg_boot[]    = "iwdt: poll counter\r\n";

RA8_INTERNAL static void internal_panic_halt(void)
{
  while (1) {
    __asm__ volatile("wfi");
  }
}

RA8_INTERNAL static void internal_setup_or_halt(void)
{
  uint32_t cpuclk0_hz = 0U;
  if (ra8_cgc_init() != k_ra8_ok) {
    internal_panic_halt();
  }
  if (ra8_cgc_get_clock_hz(k_ra8_clock_id_cpuclk0, &cpuclk0_hz) != k_ra8_ok) {
    internal_panic_halt();
  }
  if (ra8_time_init(cpuclk0_hz) != k_ra8_ok) {
    internal_panic_halt();
  }
  if (ra8_board_uart_console_init((uint32_t)k_iwdt_demo_baud) != k_ra8_ok) {
    internal_panic_halt();
  }
  if (ra8_board_led_init(k_ra8_board_led1) != k_ra8_ok) {
    internal_panic_halt();
  }
}

RA8_INTERNAL static bool internal_in_window(uint16_t counter)
{
  return (counter >= (uint16_t)k_iwdt_demo_window_low) &&
         (counter <= (uint16_t)k_iwdt_demo_window_high);
}

void main(void)
{
  internal_setup_or_halt();
  ra8_isr_globals_enable();
 
  /* Boot banner -- emit immediately after setup so the HIL host can
   * confirm the firmware booted regardless of OFS0 / IWDT state. */
  (void)ra8_board_uart_console_write(s_iwdt_demo_msg_boot,
                                     (size_t)(sizeof(s_iwdt_demo_msg_boot) - 1U));
 
  if (ra8_iwdt_init() != k_ra8_ok) {
    internal_panic_halt();
  }
 
  while (1) {
    uint16_t counter = 0U;
    if (ra8_iwdt_get_counter(&counter) != k_ra8_ok) {
      break;
    }
    if (internal_in_window(counter)) {
      ra8_iwdt_refresh_deferred();
      if (ra8_iwdt_clear_status() != k_ra8_ok) {
        break;
      }
      if (ra8_board_led_toggle(k_ra8_board_led1) != k_ra8_ok) {
        break;
      }
      if (ra8_board_uart_console_write(s_iwdt_demo_msg_refresh,
                                       (size_t)(sizeof(s_iwdt_demo_msg_refresh) - 1U)) !=
          k_ra8_ok) {
        break;
      }
    }
    ra8_delay_ms((uint32_t)k_iwdt_demo_poll_ms);
  }
  internal_panic_halt();
}