UART write example (#53)

* Rename test functions

* rewrite furi API, segfault

* make fixes in FURI, log through FURI

* add uart write example blank

* implement fuprintf instead of fopencookie

* add gif, blank page

* UART write example description

Co-authored-by: Vadim Kaushan <admin@disasm.info>

core/tty_uart.c

@@ -0,0 +1,20 @@
+#include "furi.h"
+#include "main.h"
+
+extern UART_HandleTypeDef DEBUG_UART;
+
+void handle_uart_write(const void* data, size_t size) {
+	HAL_UART_Transmit(&DEBUG_UART, (uint8_t*)data, (uint16_t)size, HAL_MAX_DELAY);
+}
+
+bool register_tty_uart() {
+	if(!furi_create("tty", NULL, 0)) {
+		return false;
+	}
+	
+	if(furi_open("tty", false, false, handle_uart_write, NULL) == NULL) {
+		return false;
+	}
+
+	return true;
+}