Modbus RTU - Multi Devices

2026-04-14 15:19:00 -05:00
commit fe8acfbc2c
1482 changed files with 182833 additions and 0 deletions
--- a/modbus_uart.txt
+++ b/modbus_uart.txt
@@ -0,0 +1,32 @@
+if (cfg->rtu.de_pin >= 0)
+    {
+        ret = uart_set_mode(uart_num, UART_MODE_RS485_HALF_DUPLEX);
+        if (ret != ESP_OK)
+        {
+            ESP_LOGE(TAG, "uart_set_mode(RS485_HALF_DUPLEX) failed: %s", esp_err_to_name(ret));
+            return ret;
+        }
+
+        ESP_LOGI(TAG, "UART RS485 half-duplex mode enabled (DE pin=%d)", cfg->rtu.de_pin);
+    }
+    else
+    {
+        ESP_LOGI(TAG, "UART normal mode enabled (shield auto-direction assumed)");
+    }
+
+    if (resp_len > 0U)
+        {
+            int written = uart_write_bytes(g_rtu_ctx.uart_num,
+                                           (const char *)tx_buf,
+                                           (uint32_t)resp_len);
+
+            ESP_LOGI(TAG, "UART wrote %d bytes", written);
+
+            if (written < 0)
+            {
+                ESP_LOGW(TAG, "uart_write_bytes failed");
+                continue;
+            }
+
+            ESP_ERROR_CHECK(uart_wait_tx_done(g_rtu_ctx.uart_num, pdMS_TO_TICKS(100)));
+        }