Modbus TCP enc28j60 communication problem

[SIlvesterrr]

Hi, Im trying to setup Modbus TCP Slave on my esp32s3 using enc28j60 module.
Ive combined enc28j60 example with modbus slave tcp example.
Device gets address from dhcp without any problem.
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When I want to read some data from device I do not get any response. Console clearly indicates that it recieved frame and accepted client communication but nothing else happends.
this is log on eth starup:

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1. I (3563) eth_example: Ethernet Got IP Address
2. I (3573) eth_example: ~~~~~~~~~~~
3. I (3573) eth_example: ETHIP:192.168.1.34
4. I (3583) eth_example: ETHMASK:255.255.255.0
5. I (3583) eth_example: ETHGW:192.168.1.1
6. I (3593) eth_example: ~~~~~~~~~~~
7. D (5673) MB_PORT_COMMON: vMBPortSetMode: Port enter critical.
8. D (5673) MB_PORT_COMMON: vMBPortSetMode: Port exit critical
9. W (5673) eth_example: Input reg. set to 000000
10. I (5673) MB_TCP_SLAVE_PORT: Protocol stack initialized.
11. D (5683) MB_PORT_COMMON: TCP Slave port enable.
12. I (5683) MB_TCP_SLAVE_PORT: Socket (#54), listener 192.168.1.34 on port: 502, errno=0

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As you can see there seems to be no problem but after trying to communicate with device I do not get any response.

qmodubs_sc.png (164.16 KiB) Viewed 1872 times

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My console looks like this while trying to commuincate:

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1. I (165093) MB_TCP_SLAVE_PORT: Socket (#55), accept client connection from address: 192.168.1.12
2. D (165093) MB_TCP_SLAVE_PORT: | TID = 0001 | PID = 0000 | LEN = 0006 | UID = 01 | FUNC = 04 | DATA = 00000001 |
3. D (165103) MB_TCP_SLAVE_PORT: Socket (#55)(192.168.1.12), get packet TID=0x1, 12 bytes.
4. D (165103) MB_PORT_COMMON: EV_FRAME_RECEIVED
5. D (165113) MB_PORT_COMMON: 04 00 00 00 01
6. D (165123) MB_PORT_COMMON: eMBPoll:EV_EXECUTE
7. D (165123) MB_TCP_SLAVE_PORT: Client 0, Socket(#55), processing time = 22852 (us).

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So it clearly recives frame but it doesn't do anything with it.
next data recieve attempt just drops the connection:

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1. E (163033) MB_TCP_SLAVE_PORT: Socket (#55)(192.168.1.12), connection closed by peer.

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Here is my Code:

Code: [Select all] [Expand/Collapse]

1. #include <stdio.h>
2. #include <string.h>
3. #include "sdkconfig.h"
4. #include "freertos/FreeRTOS.h"
5. #include "freertos/task.h"
6. #include "esp_netif.h"
7. #include "esp_eth.h"
8. #include "esp_event.h"
9. #include "esp_log.h"
10. #include "driver/gpio.h"
11. #include "driver/spi_master.h"
12. #include "eth_enc28j60/esp_eth_enc28j60.h"
13.  
14. #include "mbcontroller.h"
15. void modbus_tcp(void);
16. void modbus_slave_task(void *pvParameter);
17.  
18. static const char *TAG = "eth_example";
19.  
20. /** Event handler for Ethernet events */
21. static void eth_event_handler(void *arg, esp_event_base_t event_base,
22.                               int32_t event_id, void *event_data)
23. {
24.     uint8_t mac_addr[6] = {0};
25.     /* we can get the ethernet driver handle from event data */
26.     esp_eth_handle_t eth_handle = *(esp_eth_handle_t *)event_data;
27.  
28.     switch (event_id)
29.     {
30.     case ETHERNET_EVENT_CONNECTED:
31.         esp_eth_ioctl(eth_handle, ETH_CMD_G_MAC_ADDR, mac_addr);
32.         ESP_LOGI(TAG, "Ethernet Link Up");
33.         ESP_LOGI(TAG, "Ethernet HW Addr %02x:%02x:%02x:%02x:%02x:%02x",
34.                  mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);
35.         break;
36.     case ETHERNET_EVENT_DISCONNECTED:
37.         ESP_LOGI(TAG, "Ethernet Link Down");
38.         break;
39.     case ETHERNET_EVENT_START:
40.         ESP_LOGI(TAG, "Ethernet Started");
41.         break;
42.     case ETHERNET_EVENT_STOP:
43.         ESP_LOGI(TAG, "Ethernet Stopped");
44.         break;
45.     default:
46.         break;
47.     }
48. }
49. // char *ip;
50. /** Event handler for IP_EVENT_ETH_GOT_IP */
51. static void got_ip_event_handler(void *arg, esp_event_base_t event_base,
52.                                  int32_t event_id, void *event_data)
53. {
54.     ip_event_got_ip_t *event = (ip_event_got_ip_t *)event_data;
55.     const esp_netif_ip_info_t *ip_info = &event->ip_info;
56.  
57.     ESP_LOGI(TAG, "Ethernet Got IP Address");
58.     ESP_LOGI(TAG, "~~~~~~~~~~~");
59.     ESP_LOGI(TAG, "ETHIP:" IPSTR, IP2STR(&ip_info->ip));
60.     ESP_LOGI(TAG, "ETHMASK:" IPSTR, IP2STR(&ip_info->netmask));
61.     ESP_LOGI(TAG, "ETHGW:" IPSTR, IP2STR(&ip_info->gw));
62.     ESP_LOGI(TAG, "~~~~~~~~~~~");
63.     // modbus_tcp();
64. }
65. esp_netif_t *eth_netif;
66.  
67. void init_eth(void)
68. {
69.  
70.     ESP_ERROR_CHECK(gpio_install_isr_service(0));
71.     // Initialize TCP/IP network interface (should be called only once in application)
72.     ESP_ERROR_CHECK(esp_netif_init());
73.     // Create default event loop that running in background
74.     ESP_ERROR_CHECK(esp_event_loop_create_default());
75.     esp_netif_config_t netif_cfg = ESP_NETIF_DEFAULT_ETH();
76.     eth_netif = esp_netif_new(&netif_cfg);
77.  
78.     spi_bus_config_t buscfg = {
79.         .miso_io_num = 39,
80.         .mosi_io_num = 40,
81.         .sclk_io_num = 41,
82.         .quadwp_io_num = -1,
83.         .quadhd_io_num = -1,
84.     };
85.     ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &buscfg, SPI_DMA_CH_AUTO));
86.     /* ENC28J60 ethernet driver is based on spi driver */
87.     spi_device_interface_config_t devcfg = {
88.         .command_bits = 3,
89.         .address_bits = 5,
90.         .mode = 0,
91.         .clock_speed_hz = 8 * 1000 * 1000,
92.         .spics_io_num = 42,
93.         .queue_size = 20,
94.         .cs_ena_posttrans = enc28j60_cal_spi_cs_hold_time(8),
95.     };
96.  
97.     spi_device_handle_t spi_handle = NULL;
98.     ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &devcfg, &spi_handle));
99.  
100.     eth_enc28j60_config_t enc28j60_config = ETH_ENC28J60_DEFAULT_CONFIG(spi_handle);
101.     enc28j60_config.int_gpio_num = 38;
102.  
103.     eth_mac_config_t mac_config = ETH_MAC_DEFAULT_CONFIG();
104.     mac_config.smi_mdc_gpio_num = -1; // ENC28J60 doesn't have SMI interface
105.     mac_config.smi_mdio_gpio_num = -1;
106.     esp_eth_mac_t *mac = esp_eth_mac_new_enc28j60(&enc28j60_config, &mac_config);
107.  
108.     eth_phy_config_t phy_config = ETH_PHY_DEFAULT_CONFIG();
109.     phy_config.autonego_timeout_ms = 0; // ENC28J60 doesn't support auto-negotiation
110.     phy_config.reset_gpio_num = -1;     // ENC28J60 doesn't have a pin to reset internal PHY
111.     esp_eth_phy_t *phy = esp_eth_phy_new_enc28j60(&phy_config);
112.  
113.     esp_eth_config_t eth_config = ETH_DEFAULT_CONFIG(mac, phy);
114.     esp_eth_handle_t eth_handle = NULL;
115.     ESP_ERROR_CHECK(esp_eth_driver_install(&eth_config, &eth_handle));
116.  
117.     /* ENC28J60 doesn't burn any factory MAC address, we need to set it manually.
118.        02:00:00 is a Locally Administered OUI range so should not be used except when testing on a LAN under your control.
119.     */
120.     mac->set_addr(mac, (uint8_t[]){
121.                            0x02, 0x00, 0x00, 0x12, 0x34, 0x56});
122.  
123.     // ENC28J60 Errata #1 check
124.     if (emac_enc28j60_get_chip_info(mac) < ENC28J60_REV_B5)
125.     {
126.         ESP_LOGE(TAG, "SPI frequency must be at least 8 MHz for chip revision less than 5");
127.         ESP_ERROR_CHECK(ESP_FAIL);
128.     }
129.  
130.     /* attach Ethernet driver to TCP/IP stack */
131.     ESP_ERROR_CHECK(esp_netif_attach(eth_netif, esp_eth_new_netif_glue(eth_handle)));
132.     // Register user defined event handers
133.     ESP_ERROR_CHECK(esp_event_handler_register(ETH_EVENT, ESP_EVENT_ANY_ID, &eth_event_handler, NULL));
134.     ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_ETH_GOT_IP, &got_ip_event_handler, NULL));
135.     /* start Ethernet driver state machine */
136.     ESP_ERROR_CHECK(esp_eth_start(eth_handle));
137. }
138.  
139. mb_register_area_descriptor_t reg_area;
140. mb_param_info_t reg_info;
141. void setup_input_register(uint16_t offset, void *values, int size)
142. {
143.     reg_area.type = MB_PARAM_INPUT;
144.     reg_area.start_offset = offset;
145.     reg_area.address = values;
146.     reg_area.size = size;
147.     mbc_slave_set_descriptor(reg_area);
148.     ESP_LOGW(TAG, "Input reg. set to %#06x", offset);
149. }
150. void modbus_tcp(void)
151. {
152.     mb_communication_info_t comm_info = {0};
153.  
154.     comm_info.ip_addr_type = MB_IPV4;
155.     comm_info.ip_mode = MB_MODE_TCP;
156.  
157.     comm_info.ip_port = 502;
158.  
159.     void *slave_handler = NULL;
160.  
161.     // Initialization of Modbus controller
162.     esp_err_t err = mbc_slave_init_tcp(&slave_handler);
163.     MB_RETURN_ON_FALSE((err == ESP_OK && slave_handler != NULL), ESP_ERR_INVALID_STATE,
164.                        TAG,
165.                        "mb controller initialization fail.");
166.  
167.     comm_info.ip_addr = "192.168.1.34"; // Bind to any address
168.     comm_info.ip_netif_ptr = eth_netif;
169.  
170.     // Setup communication parameters and start stack
171.     err = mbc_slave_setup(&comm_info);
172.     MB_RETURN_ON_FALSE((err == ESP_OK), ESP_ERR_INVALID_STATE,
173.                        TAG,
174.                        "mbc_slave_setup fail, returns(0x%x).",
175.                        (uint32_t)err);
176.     uint16_t test = 5;
177.     setup_input_register(0x0, &test, 1);
178.  
179.     mbc_slave_start();
180. }
181. #define MB_PAR_INFO_GET_TIME_OUT 20
182. #define MB_READ_MASK (MB_EVENT_INPUT_REG_RD | MB_EVENT_HOLDING_REG_RD | MB_EVENT_DISCRETE_RD | MB_EVENT_COILS_RD)
183. #define MB_WRITE_MASK (MB_EVENT_HOLDING_REG_WR | MB_EVENT_COILS_WR)
184. #define MB_READ_WRITE_MASK (MB_READ_MASK | MB_WRITE_MASK)
185.  
186. void modbus_slave_task(void *pvParameter)
187. {
188.     esp_err_t rc;
189.     while (1)
190.     {
191.  
192.         rc = ESP_OK;
193.         vTaskDelay(pdMS_TO_TICKS(100));
194.         mb_event_group_t event = mbc_slave_check_event(MB_READ_WRITE_MASK);
195.         ESP_LOGW(TAG, "0x%x", event);
196.  
197.         // Check for read/write events of Modbus master for certain events
198.  
199.         /* input register read */
200.         if (event & MB_EVENT_INPUT_REG_RD)
201.         {
202.             rc += mbc_slave_get_param_info(&reg_info, MB_PAR_INFO_GET_TIME_OUT);
203.             ESP_LOGI(TAG, "INPUT READ:, ADDR:%u, SIZE:%u",
204.                      (uint32_t)reg_info.address,
205.                      (uint32_t)reg_info.size);
206.  
207.             /* discrete register read */
208.         }
209.     }
210.     // Destroy of Modbus controller on alarm
211.     ESP_LOGE(TAG, "Modbus controller destroyed.");
212.     vTaskDelay(100);
213. }
214. void app_main(void)
215. {
216.     init_eth();
217.     vTaskDelay(pdMS_TO_TICKS(5000));
218.     modbus_tcp();
219.     modbus_slave_task(NULL);
220. }

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I've looked all internet through and could not find anything helpfull. Waiting for response .

[ESP_alisitsyn]

Hi @Silvesterrr,

The question is answered here: https://github.com/espressif/esp-idf/issues/9714