main.c

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#include <stdint.h>
 
#include "ra8_agt.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_time.h"

typedef enum : uint32_t {
  k_agt_periodic_baud    = 115200U, 
  k_agt_periodic_poll_ms = 10U,     
} agt_periodic_const_t;

typedef enum : uint16_t {
  k_agt_periodic_channel = 0U, 
  /* Reload tuned for the fake -- on real silicon AGT prescaler
   * setup happens inside ra8_agt_start_free_run. */
  k_agt_periodic_reload = 0x7FFFU, 
} agt_periodic_timer_t;

typedef enum : uint8_t {
  k_agt_periodic_undf_bit = 0x20U, 
} agt_periodic_status_t;

static const uint8_t s_agt_periodic_log_msg[] = "agt: tick OK\r\n";

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

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

[[nodiscard]] RA8_INTERNAL static ra8_err_t internal_agt_periodic_arm(void)
{
  return ra8_agt_start_free_run((uint8_t)k_agt_periodic_channel, (uint16_t)k_agt_periodic_reload);
}
 
void main(void)
{
  internal_agt_periodic_setup_or_halt();
  ra8_isr_globals_enable();
 
  if (internal_agt_periodic_arm() != k_ra8_ok) {
    internal_agt_periodic_panic_halt();
  }
 
  while (1) {
    uint8_t status = 0U;
    if (ra8_agt_get_status((uint8_t)k_agt_periodic_channel, &status) != k_ra8_ok) {
      break;
    }
    if ((status & (uint8_t)k_agt_periodic_undf_bit) != 0U) {
      if (ra8_board_led_toggle(k_ra8_board_led1) != k_ra8_ok) {
        break;
      }
      if (ra8_board_uart_console_write(s_agt_periodic_log_msg,
                                       (size_t)(sizeof(s_agt_periodic_log_msg) - 1U)) != k_ra8_ok) {
        break;
      }
      /* Re-arm: stop + start clears AGTCR.TUNDF on real silicon. */
      if (ra8_agt_stop((uint8_t)k_agt_periodic_channel) != k_ra8_ok) {
        break;
      }
      if (internal_agt_periodic_arm() != k_ra8_ok) {
        break;
      }
    }
    ra8_delay_ms((uint32_t)k_agt_periodic_poll_ms);
  }
  internal_agt_periodic_panic_halt();
}