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_icu.h"
#include "ra8_isr.h"
#include "ra8_time.h"

typedef enum : uint32_t {
  k_icu_extint_demo_baud    = 115200U, 
  k_icu_extint_demo_poll_ms = 20U,     
} icu_extint_demo_const_t;

typedef enum : uint8_t {
  k_icu_extint_demo_irq_num   = 13U,   
  k_icu_extint_demo_irqf_mask = 0x40U, 
} icu_extint_demo_irq_t;

static const uint8_t s_icu_extint_demo_msg_press[] = "icu: irq13 press\r\n";
static const uint8_t s_icu_extint_demo_msg_boot[]  = "icu_extint_demo: boot\r\n";

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

RA8_INTERNAL static void internal_icu_extint_demo_setup_or_halt(void)
{
  uint32_t cpuclk0_hz = 0U;
  if (ra8_cgc_init() != k_ra8_ok) {
    internal_icu_extint_demo_panic_halt();
  }
  if (ra8_cgc_get_clock_hz(k_ra8_clock_id_cpuclk0, &cpuclk0_hz) != k_ra8_ok) {
    internal_icu_extint_demo_panic_halt();
  }
  if (ra8_time_init(cpuclk0_hz) != k_ra8_ok) {
    internal_icu_extint_demo_panic_halt();
  }
  if (ra8_icu_init() != k_ra8_ok) {
    internal_icu_extint_demo_panic_halt();
  }
  if (ra8_board_uart_console_init((uint32_t)k_icu_extint_demo_baud) != k_ra8_ok) {
    internal_icu_extint_demo_panic_halt();
  }
  if (ra8_board_led_init(k_ra8_board_led1) != k_ra8_ok) {
    internal_icu_extint_demo_panic_halt();
  }
  if (ra8_board_sw_init(k_ra8_board_sw1) != k_ra8_ok) {
    internal_icu_extint_demo_panic_halt();
  }
}

[[nodiscard]] RA8_INTERNAL static ra8_err_t internal_icu_extint_demo_arm(void)
{
  const ra8_icu_irq_cfg_t cfg = {
    .sense      = k_ra8_icu_irqmd_falling,
    .filter_div = k_ra8_icu_fclksel_pclkb_64,
    .filter_en  = true,
  };
  return ra8_icu_configure_irq_pin((uint8_t)k_icu_extint_demo_irq_num, &cfg);
}
 
void main(void)
{
  internal_icu_extint_demo_setup_or_halt();
  ra8_isr_globals_enable();
 
  if (internal_icu_extint_demo_arm() != k_ra8_ok) {
    internal_icu_extint_demo_panic_halt();
  }
 
  /* HIL boot banner -- scraped by scripts/hil/run_direct.sh to confirm
   * the CGC + SCI + ICU bring-up reached the main poll loop. */
  (void)ra8_board_uart_console_write(s_icu_extint_demo_msg_boot,
                                     (size_t)(sizeof(s_icu_extint_demo_msg_boot) - 1U));
 
  while (1) {
    uint8_t irqcr = 0U;
    if (ra8_icu_read_irqcr((uint8_t)k_icu_extint_demo_irq_num, &irqcr) != k_ra8_ok) {
      break;
    }
    if ((irqcr & (uint8_t)k_icu_extint_demo_irqf_mask) != 0U) {
      if (ra8_board_led_toggle(k_ra8_board_led1) != k_ra8_ok) {
        break;
      }
      if (ra8_board_uart_console_write(s_icu_extint_demo_msg_press,
                                       (size_t)(sizeof(s_icu_extint_demo_msg_press) - 1U)) !=
          k_ra8_ok) {
        break;
      }
    }
    ra8_delay_ms((uint32_t)k_icu_extint_demo_poll_ms);
  }
  internal_icu_extint_demo_panic_halt();
}