esp-idf/examples/ethernet/enc28j60/main/esp_eth_phy_enc28j60.c

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2020-01-09 06:32:51 -05:00
// 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 <sys/cdefs.h>
#include "esp_log.h"
#include "esp_eth.h"
#include "eth_phy_regs_struct.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
static const char *TAG = "enc28j60";
#define PHY_CHECK(a, str, goto_tag, ...) \
do \
{ \
if (!(a)) \
{ \
ESP_LOGE(TAG, "%s(%d): " str, __FUNCTION__, __LINE__, ##__VA_ARGS__); \
goto goto_tag; \
} \
} while (0)
/***************Vendor Specific Register***************/
/**
* @brief PHCON2(PHY Control Register 2)
*
*/
typedef union {
struct {
uint32_t reserved_7_0 : 8; // Reserved
uint32_t hdldis : 1; // Half-Duplex Loopback Disable
uint32_t reserved_9: 1; // Reserved
uint32_t jabber: 1; // Disable Jabber Correction
uint32_t reserved_12_11: 2; // Reserved
uint32_t txdis: 1; // Disable Twist-Pair Transmitter
uint32_t frclnk: 1; // Force Linkup
uint32_t reserved_15: 1; //Reserved
};
uint32_t val;
} phcon2_reg_t;
#define ETH_PHY_PHCON2_REG_ADDR (0x10)
/**
* @brief PHSTAT2(PHY Status Register 2)
*
*/
typedef union {
struct {
uint32_t reserved_4_0 : 5; // Reserved
uint32_t plrity : 1; // Polarity Status
uint32_t reserved_8_6 : 3; // Reserved
uint32_t dpxstat : 1; // PHY Duplex Status
uint32_t lstat : 1; // PHY Link Status (non-latching)
uint32_t colstat : 1; // PHY Collision Status
uint32_t rxstat : 1; // PHY Receive Status
uint32_t txstat : 1; // PHY Transmit Status
uint32_t reserved_15_14 : 2; // Reserved
};
uint32_t val;
} phstat2_reg_t;
#define ETH_PHY_PHSTAT2_REG_ADDR (0x11)
typedef struct {
esp_eth_phy_t parent;
esp_eth_mediator_t *eth;
uint32_t addr;
uint32_t reset_timeout_ms;
eth_link_t link_status;
int reset_gpio_num;
} phy_enc28j60_t;
static esp_err_t enc28j60_update_link_duplex_speed(phy_enc28j60_t *enc28j60)
{
esp_eth_mediator_t *eth = enc28j60->eth;
eth_speed_t speed = ETH_SPEED_10M; // enc28j60 speed is fixed to 10Mbps
eth_duplex_t duplex = ETH_DUPLEX_HALF;
phstat2_reg_t phstat;
PHY_CHECK(eth->phy_reg_read(eth, enc28j60->addr, ETH_PHY_PHSTAT2_REG_ADDR, &(phstat.val)) == ESP_OK,
"read PHSTAT2 failed", err);
eth_link_t link = phstat.lstat ? ETH_LINK_UP : ETH_LINK_DOWN;
/* check if link status changed */
if (enc28j60->link_status != link) {
/* when link up, read result */
if (link == ETH_LINK_UP) {
if (phstat.dpxstat) {
duplex = ETH_DUPLEX_FULL;
} else {
duplex = ETH_DUPLEX_HALF;
}
PHY_CHECK(eth->on_state_changed(eth, ETH_STATE_SPEED, (void *)speed) == ESP_OK,
"change speed failed", err);
PHY_CHECK(eth->on_state_changed(eth, ETH_STATE_DUPLEX, (void *)duplex) == ESP_OK,
"change duplex failed", err);
}
PHY_CHECK(eth->on_state_changed(eth, ETH_STATE_LINK, (void *)link) == ESP_OK,
"change link failed", err);
enc28j60->link_status = link;
}
return ESP_OK;
err:
return ESP_FAIL;
}
static esp_err_t enc28j60_set_mediator(esp_eth_phy_t *phy, esp_eth_mediator_t *eth)
{
PHY_CHECK(eth, "can't set mediator for enc28j60 to null", err);
phy_enc28j60_t *enc28j60 = __containerof(phy, phy_enc28j60_t, parent);
enc28j60->eth = eth;
return ESP_OK;
err:
return ESP_ERR_INVALID_ARG;
}
static esp_err_t enc28j60_get_link(esp_eth_phy_t *phy)
{
phy_enc28j60_t *enc28j60 = __containerof(phy, phy_enc28j60_t, parent);
/* Updata information about link, speed, duplex */
PHY_CHECK(enc28j60_update_link_duplex_speed(enc28j60) == ESP_OK, "update link duplex speed failed", err);
return ESP_OK;
err:
return ESP_FAIL;
}
static esp_err_t enc28j60_reset(esp_eth_phy_t *phy)
{
phy_enc28j60_t *enc28j60 = __containerof(phy, phy_enc28j60_t, parent);
enc28j60->link_status = ETH_LINK_DOWN;
esp_eth_mediator_t *eth = enc28j60->eth;
bmcr_reg_t bmcr = {.reset = 1};
PHY_CHECK(eth->phy_reg_write(eth, enc28j60->addr, ETH_PHY_BMCR_REG_ADDR, bmcr.val) == ESP_OK,
"write BMCR failed", err);
/* Wait for reset complete */
uint32_t to = 0;
for (to = 0; to < enc28j60->reset_timeout_ms / 10; to++) {
vTaskDelay(pdMS_TO_TICKS(10));
PHY_CHECK(eth->phy_reg_read(eth, enc28j60->addr, ETH_PHY_BMCR_REG_ADDR, &(bmcr.val)) == ESP_OK,
"read BMCR failed", err);
if (!bmcr.reset) {
break;
}
}
PHY_CHECK(to < enc28j60->reset_timeout_ms / 10, "PHY reset timeout", err);
return ESP_OK;
err:
return ESP_FAIL;
}
static esp_err_t enc28j60_reset_hw(esp_eth_phy_t *phy)
{
phy_enc28j60_t *enc28j60 = __containerof(phy, phy_enc28j60_t, parent);
// set reset_gpio_num minus zero can skip hardware reset phy chip
if (enc28j60->reset_gpio_num >= 0) {
gpio_reset_pin(enc28j60->reset_gpio_num);
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gpio_set_direction(enc28j60->reset_gpio_num, GPIO_MODE_OUTPUT);
gpio_set_level(enc28j60->reset_gpio_num, 0);
gpio_set_level(enc28j60->reset_gpio_num, 1);
}
return ESP_OK;
}
static esp_err_t enc28j60_negotiate(esp_eth_phy_t *phy)
{
/**
* ENC28J60 does not support automatic duplex negotiation.
* If it is connected to an automatic duplex negotiation enabled network switch,
* ENC28J60 will be detected as a half-duplex device.
* To communicate in Full-Duplex mode, ENC28J60 and the remote node
* must be manually configured for full-duplex operation.
*/
phy_enc28j60_t *enc28j60 = __containerof(phy, phy_enc28j60_t, parent);
/* Updata information about link, speed, duplex */
PHY_CHECK(enc28j60_update_link_duplex_speed(enc28j60) == ESP_OK, "update link duplex speed failed", err);
return ESP_OK;
err:
return ESP_FAIL;
}
static esp_err_t enc28j60_pwrctl(esp_eth_phy_t *phy, bool enable)
{
phy_enc28j60_t *enc28j60 = __containerof(phy, phy_enc28j60_t, parent);
esp_eth_mediator_t *eth = enc28j60->eth;
bmcr_reg_t bmcr;
PHY_CHECK(eth->phy_reg_read(eth, enc28j60->addr, ETH_PHY_BMCR_REG_ADDR, &(bmcr.val)) == ESP_OK,
"read BMCR failed", err);
if (!enable) {
/* Enable IEEE Power Down Mode */
bmcr.power_down = 1;
} else {
/* Disable IEEE Power Down Mode */
bmcr.power_down = 0;
}
PHY_CHECK(eth->phy_reg_write(eth, enc28j60->addr, ETH_PHY_BMCR_REG_ADDR, bmcr.val) == ESP_OK,
"write BMCR failed", err);
PHY_CHECK(eth->phy_reg_read(eth, enc28j60->addr, ETH_PHY_BMCR_REG_ADDR, &(bmcr.val)) == ESP_OK,
"read BMCR failed", err);
if (!enable) {
PHY_CHECK(bmcr.power_down == 1, "power down failed", err);
} else {
PHY_CHECK(bmcr.power_down == 0, "power up failed", err);
}
return ESP_OK;
err:
return ESP_FAIL;
}
static esp_err_t enc28j60_set_addr(esp_eth_phy_t *phy, uint32_t addr)
{
phy_enc28j60_t *enc28j60 = __containerof(phy, phy_enc28j60_t, parent);
enc28j60->addr = addr;
return ESP_OK;
}
static esp_err_t enc28j60_get_addr(esp_eth_phy_t *phy, uint32_t *addr)
{
PHY_CHECK(addr, "addr can't be null", err);
phy_enc28j60_t *enc28j60 = __containerof(phy, phy_enc28j60_t, parent);
*addr = enc28j60->addr;
return ESP_OK;
err:
return ESP_ERR_INVALID_ARG;
}
static esp_err_t enc28j60_del(esp_eth_phy_t *phy)
{
phy_enc28j60_t *enc28j60 = __containerof(phy, phy_enc28j60_t, parent);
free(enc28j60);
return ESP_OK;
}
static esp_err_t enc28j60_init(esp_eth_phy_t *phy)
{
phy_enc28j60_t *enc28j60 = __containerof(phy, phy_enc28j60_t, parent);
esp_eth_mediator_t *eth = enc28j60->eth;
/* Power on Ethernet PHY */
PHY_CHECK(enc28j60_pwrctl(phy, true) == ESP_OK, "power control failed", err);
/* Reset Ethernet PHY */
PHY_CHECK(enc28j60_reset(phy) == ESP_OK, "reset failed", err);
/* Check PHY ID */
phyidr1_reg_t id1;
phyidr2_reg_t id2;
PHY_CHECK(eth->phy_reg_read(eth, enc28j60->addr, ETH_PHY_IDR1_REG_ADDR, &(id1.val)) == ESP_OK,
"read ID1 failed", err);
PHY_CHECK(eth->phy_reg_read(eth, enc28j60->addr, ETH_PHY_IDR2_REG_ADDR, &(id2.val)) == ESP_OK,
"read ID2 failed", err);
PHY_CHECK(id1.oui_msb == 0x0083 && id2.oui_lsb == 0x05 && id2.vendor_model == 0x00,
"wrong chip ID", err);
/* Disable half duplex loopback */
phcon2_reg_t phcon2;
PHY_CHECK(eth->phy_reg_read(eth, enc28j60->addr, ETH_PHY_PHCON2_REG_ADDR, &(phcon2.val)) == ESP_OK,
"read PHCON2 failed", err);
phcon2.hdldis = 1;
PHY_CHECK(eth->phy_reg_write(eth, enc28j60->addr, ETH_PHY_PHCON2_REG_ADDR, phcon2.val) == ESP_OK,
"write PHCON2 failed", err);
return ESP_OK;
err:
return ESP_FAIL;
}
static esp_err_t enc28j60_deinit(esp_eth_phy_t *phy)
{
/* Power off Ethernet PHY */
PHY_CHECK(enc28j60_pwrctl(phy, false) == ESP_OK, "power off Ethernet PHY failed", err);
return ESP_OK;
err:
return ESP_FAIL;
}
esp_eth_phy_t *esp_eth_phy_new_enc28j60(const eth_phy_config_t *config)
{
PHY_CHECK(config, "can't set phy config to null", err);
phy_enc28j60_t *enc28j60 = calloc(1, sizeof(phy_enc28j60_t));
PHY_CHECK(enc28j60, "calloc enc28j60 failed", err);
enc28j60->addr = config->phy_addr; // although PHY addr is meaningless to ENC28J60
enc28j60->reset_timeout_ms = config->reset_timeout_ms;
enc28j60->reset_gpio_num = config->reset_gpio_num;
enc28j60->link_status = ETH_LINK_DOWN;
enc28j60->parent.reset = enc28j60_reset;
enc28j60->parent.reset_hw = enc28j60_reset_hw;
enc28j60->parent.init = enc28j60_init;
enc28j60->parent.deinit = enc28j60_deinit;
enc28j60->parent.set_mediator = enc28j60_set_mediator;
enc28j60->parent.negotiate = enc28j60_negotiate;
enc28j60->parent.get_link = enc28j60_get_link;
enc28j60->parent.pwrctl = enc28j60_pwrctl;
enc28j60->parent.get_addr = enc28j60_get_addr;
enc28j60->parent.set_addr = enc28j60_set_addr;
enc28j60->parent.del = enc28j60_del;
return &(enc28j60->parent);
err:
return NULL;
}