Move plugins to external folder

applications/external/swd_probe/usb_uart.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef struct UsbUart UsbUart;
+
+typedef struct {
+    uint8_t vcp_ch;
+    size_t (*rx_data)(void* ctx, uint8_t* data, size_t length);
+    void* rx_data_ctx;
+} UsbUartConfig;
+
+typedef struct {
+    uint32_t rx_cnt;
+    uint32_t tx_cnt;
+} UsbUartState;
+
+UsbUart* usb_uart_enable(UsbUartConfig* cfg);
+
+void usb_uart_disable(UsbUart* usb_uart);
+
+void usb_uart_set_config(UsbUart* usb_uart, UsbUartConfig* cfg);
+
+void usb_uart_get_config(UsbUart* usb_uart, UsbUartConfig* cfg);
+
+void usb_uart_get_state(UsbUart* usb_uart, UsbUartState* st);
+
+bool usb_uart_tx_data(UsbUart* usb_uart, uint8_t* data, size_t length);