Add UART REPL library and example

examples/uart_repl_test/FreeRTOSConfig.h

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+#define configUSE_COUNTING_SEMAPHORES (1)
+
+#include_next <FreeRTOSConfig.h>
+

examples/uart_repl_test/Makefile

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+PROGRAM=uart_repl_test.c
+EXTRA_COMPONENTS=extras/stdin_uart_interrupt extras/uart_repl
+ESPBAUD=921600
+
+include ../../common.mk
+
+serial:
+	screen $(ESPPORT) 115200
+

examples/uart_repl_test/uart_repl_test.c

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+#include <stdlib.h>
+#include <string.h> /* strlen */
+
+#include <espressif/esp_common.h>
+#include <espressif/user_interface.h>
+#include <esp/uart.h>
+#include <FreeRTOS.h>
+#include <task.h>
+
+#include <uart_repl/uart_repl.h>
+
+
+void handle_command(char const d[]) {
+	if (!strcmp(d, "ts") || !strcmp(d, "time")) {
+		printf("the tick count since boot is: %u\n", xTaskGetTickCount());
+	} else if (!strcmp(d, "help")) {
+		printf("commands include ts, time\n");
+	} else {
+		printf("command not recognized, try help\n");
+	}
+}
+
+
+void user_init(void) {
+	uart_set_baud(0, 115200);
+
+	printf("\n\nWelcome to the uart REPL demo. try \"help\"\n");
+	uart_repl_init(&handle_command);
+}
+
+

extras/uart_repl/component.mk

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+# Component makefile for extras/uart_repl
+
+# expected anyone using this library includes it as 'uart_repl/uart_repl.h'
+INC_DIRS += $(uart_repl_ROOT)..
+
+# args for passing into compile rule generation
+uart_repl_SRC_DIR = $(uart_repl_ROOT)
+
+$(eval $(call component_compile_rules,uart_repl))