ESP32 UART over Lora

[saeedisa]

I have 2 ESP32S - WROOM - 32 and 2 Lora E220-400T22S, Lora is installed on Ebyte E15-ULT1. I'm tryin to create transmitter and receivers of this 2 setups. Each setup is a ESP32S and Lora connected together, where:

From Lora's side, I have pins:
* RXD: which is used for Receiving data
* TXD: which is used for Transmitting data
* AUX
* NC1, NC2, NC3
* GRD
* VCC
* M0, M1

in ESP32S I have a lot of pins:
* GRD, VCC
* a lot of GPIO

I have connected ESP32 to Lora by those;
* Lora GND -> ESP GND
* Lora VCC -> ESP VCC 5V
* M0, M1 -> GND
* Lora RXD and TXD to ESP GPIO 16, 17 in ESP (Tried the opposite as well, do RXD and TXD to ESP GPIO 17, 16 but that did not solve.)

I have written 2 similar codes where the only diff is read/write respectively to transmit/receive operation.

Where receiver app is:

Code: [Select all] [Expand/Collapse]

1. #define ECHO_TEST_TXD (17)
2. #define ECHO_TEST_RXD (16)
3. #define ECHO_TEST_RTS (UART_PIN_NO_CHANGE)
4. #define ECHO_TEST_CTS (UART_PIN_NO_CHANGE)
5.  
6. #define ECHO_UART_PORT_NUM      (UART_NUM_0)
7. #define ECHO_UART_BAUD_RATE     (115200)
8.  
9. #define BUF_SIZE (1024)
10.  
11. void lora_uart() {
12.  
13. /* Configure parameters of an UART driver,
14.  * communication pins and install the driver */
15. uart_config_t uart_config = {
16.     .baud_rate = ECHO_UART_BAUD_RATE,
17.     .data_bits = UART_DATA_8_BITS,
18.     .parity    = UART_PARITY_DISABLE,
19.     .stop_bits = UART_STOP_BITS_1,
20.     .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
21.     .source_clk = UART_SCLK_DEFAULT,
22. };
23. int intr_alloc_flags = 0;
24.  
25.  
26. #if CONFIG_UART_ISR_IN_IRAM
27.     intr_alloc_flags = ESP_INTR_FLAG_IRAM;
28. #endif
29.  
30. ESP_ERROR_CHECK(uart_driver_install(ECHO_UART_PORT_NUM, BUF_SIZE * 2, 0, 0, NULL, intr_alloc_flags));
31. ESP_ERROR_CHECK(uart_param_config(ECHO_UART_PORT_NUM, &uart_config));
32. ESP_ERROR_CHECK(uart_set_pin(ECHO_UART_PORT_NUM, ECHO_TEST_TXD, ECHO_TEST_RXD, ECHO_TEST_RTS, ECHO_TEST_CTS));
33.  
34. // Configure a temporary buffer for the incoming data
35. uint8_t *data = (uint8_t *) malloc(BUF_SIZE);
36.  
37. while (1) {
38.     // Read data from the UART
39.     ESP_LOGI(TAG, "Receiving.....");
40.     int len = uart_read_bytes(ECHO_UART_PORT_NUM, data, (BUF_SIZE - 1), 20 / portTICK_PERIOD_MS);
41.     if (len) {
42.         data[len] = '\0';
43.         ESP_LOGI(TAG, "Recv str: %s", (char *) data);
44.     }
45.     vTaskDelay(1000);
46. }
47. }

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and transmitter app is:

Code: [Select all] [Expand/Collapse]

1. #define ECHO_TEST_TXD (17)
2. #define ECHO_TEST_RXD (16)
3. #define ECHO_TEST_RTS (UART_PIN_NO_CHANGE)
4. #define ECHO_TEST_CTS (UART_PIN_NO_CHANGE)
5.  
6. #define ECHO_UART_PORT_NUM      (UART_NUM_0)
7. #define ECHO_UART_BAUD_RATE     (115200)
8.  
9. #define BUF_SIZE (1024)
10.  
11.  
12. void lora_uart() {
13.  
14. /* Configure parameters of an UART driver,
15.  * communication pins and install the driver */
16. uart_config_t uart_config = {
17.     .baud_rate = ECHO_UART_BAUD_RATE,
18.     .data_bits = UART_DATA_8_BITS,
19.     .parity    = UART_PARITY_DISABLE,
20.     .stop_bits = UART_STOP_BITS_1,
21.     .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
22.     .source_clk = UART_SCLK_DEFAULT,
23. };
24. int intr_alloc_flags = 0;
25.  
26. #if CONFIG_UART_ISR_IN_IRAM
27.     intr_alloc_flags = ESP_INTR_FLAG_IRAM;
28. #endif
29.  
30. ESP_ERROR_CHECK(uart_driver_install(ECHO_UART_PORT_NUM, BUF_SIZE * 2, 0, 0, NULL, intr_alloc_flags));
31. ESP_ERROR_CHECK(uart_param_config(ECHO_UART_PORT_NUM, &uart_config));
32. ESP_ERROR_CHECK(uart_set_pin(ECHO_UART_PORT_NUM, ECHO_TEST_TXD, ECHO_TEST_RXD, ECHO_TEST_RTS, ECHO_TEST_CTS));
33.  
34. // Configure a temporary buffer for the incoming data
35. // uint8_t *data = (uint8_t *) malloc(BUF_SIZE);
36.  
37. while (1) {
38.     // Write data back to the UART
39.     ESP_LOGI(TAG, "Sending....." );
40.     uart_write_bytes(ECHO_UART_PORT_NUM, (const char *) "Hello", 5);
41.     ESP_LOGI(TAG, "Wrote data str: %s", (char *) "Hello");
42.     vTaskDelay(1000);
43. }
44. }

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But no success of receiving any data...

What did I miss in connectivity ? is there anything special I need to do in addition ?
I have been struggling with this for many days now

Thanks in advance

[jayhack]

I can't find info on any E15-ULT1, but Ebyte modules I have used had default baud rate of 9600.

[aliarifat794]

Sorry I could not find any tutorial on ESP32 and Lora E220-400T22S. However, I found one project on ESP32 microcontroller with an RA-01 LoRa module. You can check this out and see if it helps in any way: https://www.pcbway.com/project/sharepro ... 56be3.html
You can also check this library: https://github.com/xreef/EByte_LoRa_E22_Series_Library