Commit 5f1c6ee2 authored by Carles Cufi's avatar Carles Cufi Committed by Anas Nashif
Browse files

console: Add a Segger RTT console driver 



The Real Time Terminal functionality of the Segger J-Link
debug probe and software suite allows applications to write
to a certain RAM area that is read in real-time by the
debugger. This is specially useful when a UART is not
available to provide a console.
This commit adds a console driver that outputs over an RTT
"connection".

Change-Id: Ifce8020060e9f519a61f3f1fbe9f56f98da2ef7f
Signed-off-by: default avatarCarles Cufi <carles.cufi@nordicsemi.no>
parent d9150ee3

drivers/console/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -127,6 +127,17 @@ config RAM_CONSOLE_BUFFER_SIZE 
	Size of the RAM console buffer. Messages will wrap around if the

	length is exceeded.



config RTT_CONSOLE

	bool

	prompt "Use RTT console"

	depends on HAS_SEGGER_RTT

	select CONSOLE_HAS_DRIVER

	default n

	help

	Emit console messages to a RAM buffer that is then read by the

	Segger J-Link software and displayed on a computer in real-time.

	Requires support for Segger J-Link on the companion IC onboard.



config IPM_CONSOLE_SENDER

	bool

	prompt "Inter-processor Mailbox console sender"

drivers/console/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ obj-$(CONFIG_ENABLE_SHELL) += shells/ 
obj-$(CONFIG_CONSOLE_HANDLER_SHELL) += console_handler_shell.o

obj-$(CONFIG_UART_CONSOLE) += uart_console.o

obj-$(CONFIG_RAM_CONSOLE) += ram_console.o

obj-$(CONFIG_RTT_CONSOLE) += rtt_console.o

obj-$(CONFIG_IPM_CONSOLE_RECEIVER) += ipm_console_receiver.o

obj-$(CONFIG_IPM_CONSOLE_SENDER) += ipm_console_sender.o

obj-$(CONFIG_UART_PIPE) += uart_pipe.o

drivers/console/rtt_console.c

0 → 100644
+51 −0
Original line number Diff line number Diff line 
/* rtt_console.c - Console messages to a RAM buffer that is then read by

 * the Segger J-Link debugger

 */



/*

 * Copyright (c) 2016 Nordic Semiconductor ASA

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */





#include <kernel.h>

#include <misc/printk.h>

#include <device.h>

#include <init.h>

#include <rtt/SEGGER_RTT.h>



extern void __printk_hook_install(int (*fn)(int));

extern void __stdout_hook_install(int (*fn)(int));



static int rtt_console_out(int character)

{

	char c = (char)character;



	SEGGER_RTT_WriteNoLock(0, &c, 1);

	return character;

}



static int rtt_console_init(struct device *d)

{

	ARG_UNUSED(d);



	SEGGER_RTT_Init();



	__printk_hook_install(rtt_console_out);

	__stdout_hook_install(rtt_console_out);



	return 0;

}



SYS_INIT(rtt_console_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);

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