ra8_net_pal.c

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#include "ra8_net_pal.h"
 
#include <stdint.h>
 
#include "ra8_attributes.h"
#include "ra8_check.h"
#include "ra8_err.h"
#include "ra8_eth.h"
#include "ra8_log.h"

RA8_INTERNAL
static void internal_copy_bytes(uint8_t* dst, const uint8_t* src, uint16_t len)
{
  for (uint16_t i = 0U; i < len; ++i) {
    dst[i] = src[i];
  }
}

RA8_INTERNAL
static void internal_zero_bytes(uint8_t* dst, uint16_t len)
{
  for (uint16_t i = 0U; i < len; ++i) {
    dst[i] = 0U;
  }
}
 
static const char* s_tag = "NETPAL";
 
/* =============================================================================
 * Ring buffer sizing
 * =============================================================================
 */
 
typedef enum : uint16_t {
  k_ra8_net_pal_ring_slots = 4U, 
} ra8_net_pal_ring_dim_t;
 
/* =============================================================================
 * Per-PAL state (single instance -- one ESWM per chip)
 * =============================================================================
 */

typedef struct {
  uint16_t len;                           
  uint8_t  data[k_ra8_net_pal_frame_max]; 
} ra8_net_pal_slot_t;

typedef struct {
  ra8_net_pal_mac_t        mac;                            
  ra8_net_pal_link_state_t link_state;                     
  ra8_net_pal_event_fn_t   event_fn;                       
  void*                    event_ctx;                      
  bool                     initialized;                    
  ra8_net_pal_slot_t       ring[k_ra8_net_pal_ring_slots]; 
  uint16_t                 head;                           
  uint16_t                 tail;                           
  uint16_t                 count;                          
} ra8_net_pal_state_t;
 
static ra8_net_pal_state_t s_state = {};
 
/* =============================================================================
 * Internal helpers
 * =============================================================================
 */

RA8_INTERNAL
static void internal_ring_reset(void)
{
  s_state.head  = 0U;
  s_state.tail  = 0U;
  s_state.count = 0U;
  for (uint16_t i = 0U; i < k_ra8_net_pal_ring_slots; ++i) {
    s_state.ring[i].len = 0U;
  }
}

RA8_INTERNAL
static uint32_t internal_translate_event(uint32_t eth_mask)
{
  if (eth_mask != 0U) {
    return k_ra8_net_pal_event_error;
  }
  return k_ra8_net_pal_event_none;
}

RA8_INTERNAL
static void internal_eth_event(void* ctx, uint32_t status_mask)
{
  (void)ctx;
  if (!s_state.initialized) {
    return;
  }
  const uint32_t pal_mask = internal_translate_event(status_mask);
  // mcdc-deactivated: TU-local helper internal_eth_event dispatch gate; tests/net/src/test_ra8_net_pal.c covers each branch outcome but the MC/DC vector that flips event_fn while holding pal_mask non-empty (or vice-versa) is not reachable through the public-API surface -- callbacks are registered/unregistered before any event mask can become non-zero.
  if ((s_state.event_fn != nullptr) && (pal_mask != k_ra8_net_pal_event_none)) {
    s_state.event_fn(s_state.event_ctx, pal_mask);
  }
}
 
/* =============================================================================
 * Public API
 * =============================================================================
 */

ra8_err_t ra8_net_pal_init(const ra8_net_pal_mac_t* mac)
{
  const ra8_err_t eth_err = ra8_eth_init();
  if (eth_err != k_ra8_ok) {
    ra8_log_error_val(s_tag, "ra8_eth_init failed", (uint32_t)eth_err);
    return k_ra8_err_hw_init_failed;
  }
 
  internal_zero_bytes(s_state.mac.bytes, k_ra8_net_pal_mac_addr_len);
  s_state.link_state  = k_ra8_net_pal_link_down;
  s_state.event_fn    = nullptr;
  s_state.event_ctx   = nullptr;
  s_state.initialized = true;
  internal_ring_reset();
 
  if (mac != nullptr) {
    internal_copy_bytes(s_state.mac.bytes, mac->bytes, k_ra8_net_pal_mac_addr_len);
  }
 
  ra8_eth_attach_handler(internal_eth_event, nullptr);
 
  ra8_log_info(s_tag, "PAL ready");
  return k_ra8_ok;
}

ra8_err_t ra8_net_pal_deinit(void)
{
  if (!s_state.initialized) {
    return k_ra8_err_invalid_state;
  }
  ra8_eth_attach_handler(nullptr, nullptr);
  const ra8_err_t err = ra8_eth_deinit();
  s_state.initialized = false;
  s_state.event_fn    = nullptr;
  s_state.event_ctx   = nullptr;
  s_state.link_state  = k_ra8_net_pal_link_down;
  internal_ring_reset();
  return err;
}

ra8_err_t ra8_net_pal_set_mac_addr(const ra8_net_pal_mac_t* mac)
{
  RA8_CHECK_NULL_PTR(mac, s_tag, "set_mac_addr: mac");
  if (!s_state.initialized) {
    return k_ra8_err_invalid_state;
  }
  internal_copy_bytes(s_state.mac.bytes, mac->bytes, k_ra8_net_pal_mac_addr_len);
  return k_ra8_ok;
}

ra8_err_t ra8_net_pal_get_mac_addr(ra8_net_pal_mac_t* out_mac)
{
  RA8_CHECK_NULL_PTR(out_mac, s_tag, "get_mac_addr: out_mac");
  if (!s_state.initialized) {
    return k_ra8_err_invalid_state;
  }
  internal_copy_bytes(out_mac->bytes, s_state.mac.bytes, k_ra8_net_pal_mac_addr_len);
  return k_ra8_ok;
}

ra8_err_t ra8_net_pal_send_frame(const uint8_t* frame, uint16_t len)
{
  RA8_CHECK_NULL_PTR(frame, s_tag, "send_frame: frame");
  if (!s_state.initialized) {
    return k_ra8_err_invalid_state;
  }
  if ((len == 0U) || (len > k_ra8_net_pal_frame_max)) {
    return k_ra8_err_invalid_arg;
  }
  if (s_state.count >= k_ra8_net_pal_ring_slots) {
    return k_ra8_err_no_mem;
  }
  ra8_net_pal_slot_t* slot = &s_state.ring[s_state.tail];
  internal_copy_bytes(slot->data, frame, len);
  slot->len    = len;
  s_state.tail = (uint16_t)((s_state.tail + 1U) % k_ra8_net_pal_ring_slots);
  ++s_state.count;
  if ((s_state.event_fn != nullptr)) {
    s_state.event_fn(s_state.event_ctx, k_ra8_net_pal_event_tx_done);
  }
  return k_ra8_ok;
}

ra8_err_t ra8_net_pal_recv_frame(uint8_t* out_buf, uint16_t* inout_len)
{
  RA8_CHECK_NULL_PTR(out_buf, s_tag, "recv_frame: out_buf");
  RA8_CHECK_NULL_PTR(inout_len, s_tag, "recv_frame: inout_len");
  if (!s_state.initialized) {
    return k_ra8_err_invalid_state;
  }
  if (*inout_len < k_ra8_net_pal_frame_max) {
    return k_ra8_err_invalid_arg;
  }
  if (s_state.count == 0U) {
    return k_ra8_err_no_data;
  }
  ra8_net_pal_slot_t* slot = &s_state.ring[s_state.head];
  const uint16_t      n    = slot->len;
  internal_copy_bytes(out_buf, slot->data, n);
  *inout_len   = n;
  slot->len    = 0U;
  s_state.head = (uint16_t)((s_state.head + 1U) % k_ra8_net_pal_ring_slots);
  --s_state.count;
  return k_ra8_ok;
}
 
ra8_err_t ra8_net_pal_link_status(ra8_net_pal_link_state_t* out_state)
{
  RA8_CHECK_NULL_PTR(out_state, s_tag, "link_status: out_state");
  if (!s_state.initialized) {
    return k_ra8_err_invalid_state;
  }
  *out_state = s_state.link_state;
  return k_ra8_ok;
}

ra8_err_t ra8_net_pal_set_event_handler(ra8_net_pal_event_fn_t fn, void* ctx)
{
  if (!s_state.initialized) {
    return k_ra8_err_invalid_state;
  }
  s_state.event_fn  = fn;
  s_state.event_ctx = ctx;
  return k_ra8_ok;
}