esp-idf/components/esp_eth/src/esp_eth_phy.c

// Copyright 2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include <stdlib.h>
#include "esp_log.h"
#include "esp_eth.h"
#include "eth_phy_regs_struct.h"

static const char *TAG = "esp_eth.phy";

esp_err_t esp_eth_detect_phy_addr(esp_eth_mediator_t *eth, int *detected_addr)
{
    if (!eth || !detected_addr) {
        ESP_LOGE(TAG, "eth and detected_addr can't be null");
        return ESP_ERR_INVALID_ARG;
    }
    int addr_try = 0;
    uint32_t reg_value = 0;
    for (; addr_try < 16; addr_try++) {
        eth->phy_reg_read(eth, addr_try, ETH_PHY_IDR1_REG_ADDR, &reg_value);
        if (reg_value != 0xFFFF && reg_value != 0x00) {
            *detected_addr = addr_try;
            break;
        }
    }
    if (addr_try < 16) {
        ESP_LOGD(TAG, "Found PHY address: %d", addr_try);
        return ESP_OK;
    } else {
        ESP_LOGE(TAG, "No PHY device detected");
        return ESP_ERR_NOT_FOUND;
    }
}