main.c

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#include <stdint.h>
 
#include "lowpower_holdpage.h"
#include "ra8_boot_entry.h"
#include "ra8_dual_core.h"
#include "ra8_err.h"
#include "ra8_log.h"

extern uint32_t g_ra8_ls_cpu1_mram_start;
extern uint32_t g_ra8_ls_cpu1_stack_top;

typedef enum : uint32_t {
  k_m85_park_log_every = 240U, 
} m85_lowpower_const_t;

static void render_page0(volatile lowpower_mailbox_t* mb)
{
  mb->magic         = 0U;
  mb->page_num      = 0U;
  mb->active_core   = (uint32_t)k_lowpower_core_m33;
  mb->m33_heartbeat = 0U;
  mb->sw1_events    = 0U;
  __asm volatile("dsb" ::: "memory");
  mb->magic = (uint32_t)k_lowpower_magic;
  __asm volatile("dsb" ::: "memory");
}

[[noreturn]] static void park_low_power(volatile lowpower_mailbox_t* mb)
{
  (void)mb; /* Read only inside ra8_log_info_val(), which a non-Debug build elides. */
  uint32_t wakes = 0U;
  while (1) {
    __asm volatile("wfi");
    wakes++;
    if ((wakes % (uint32_t)k_m85_park_log_every) == 0U) {
      ra8_log_info_val("M85", "parked (WFI); M33 hold heartbeat", mb->m33_heartbeat);
    }
  }
}

[[noreturn]] static void park_forever(void)
{
  while (1) {
    __asm volatile("nop");
  }
}

void main(void)
{
  ra8_log_init();
  ra8_log_info("M85", "==== RA8D2 low-power hold-page demo ====");
  ra8_log_info("M85", "Cortex-M85 primary core online");
  ra8_log_info("M85", "mailbox in shared SRAM at 0x22100000");
 
  volatile lowpower_mailbox_t* mb = lowpower_mailbox();
  render_page0(mb);
  ra8_log_info("M85", "rendered page 0; handing the held page to the M33");
 
  ra8_log_info("M85", "releasing Cortex-M33 secondary core ...");
  const ra8_err_t err = ra8_cpu1_release(&g_ra8_ls_cpu1_mram_start, &g_ra8_ls_cpu1_stack_top);
  ra8_log_info_val("M85", "ra8_cpu1_release rc (0 = ok)", (uint32_t)err);
  if (err != k_ra8_ok) {
    ra8_log_info("M85", "release FAILED -- halting");
    park_forever();
  }
 
  ra8_log_info("M85", "low-power: page handed to M33; M85 parking (clock-gated posture)");
  park_low_power(mb);
}