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/****************************************************************************
* configs/arduino-due/src/sam_autoleds.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <debug.h>
#include <arch/board/board.h>
#include "chip.h"
#include "sam_gpio.h"
#include "arduino-due.h"
#ifdef CONFIG_ARCH_LEDS
/****************************************************************************
* Definitions
****************************************************************************/
/* There are three user-controllable LEDs on board the Arduino Due board:
*
* LED GPIO
* ---------------- -----
* L Amber LED PB27
* TX Yellow LED PA21
* RX Yellow LED PC30
*
* LED L is connected to ground and can be illuminated by driving the PB27
* output high. The TX and RX LEDs are pulled high and can be illuminated by
* driving the corresponding
* GPIO output to low.
*
* These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
* defined. In that case, the usage by the board port is defined in
* include/board.h and src/sam_leds.c. The LEDs are used to encode OS-related
* events as follows:
*
* SYMBOL MEANING LED STATE
* L TX RX
* ------------------- ----------------------- -------- -------- --------
* LED_STARTED NuttX has been started OFF OFF OFF
* LED_HEAPALLOCATE Heap has been allocated OFF OFF OFF
* LED_IRQSENABLED Interrupts enabled OFF OFF OFF
* LED_STACKCREATED Idle stack created ON OFF OFF
* LED_INIRQ In an interrupt N/C GLOW OFF
* LED_SIGNAL In a signal handler N/C GLOW OFF
* LED_ASSERTION An assertion failed N/C GLOW OFF
* LED_PANIC The system has crashed N/C N/C Blinking
* LED_IDLE MCU is is sleep mode ------ Not used --------
*
* Thus if LED L is statically on, NuttX has successfully booted and is,
* apparently, running normmally. If LED RX is glowing, then NuttX is
* handling interupts (and also signals and assertions). If TX is flashing
* at approximately 2Hz, then a fatal error has been detected and the system
*/
/* CONFIG_DEBUG_LEDS enables debug output from this file (needs CONFIG_DEBUG
* with CONFIG_DEBUG_VERBOSE too)
*/
#ifdef CONFIG_DEBUG_LEDS
# define leddbg lldbg
# define ledvdbg llvdbg
#else
# define leddbg(x...)
# define ledvdbg(x...)
#endif
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_ledinit
****************************************************************************/
void up_ledinit(void)
{
/* Configure RX and TX LED GPIOs for output */
sam_configgpio(GPIO_LED_L);
sam_configgpio(GPIO_LED_RX);
sam_configgpio(GPIO_LED_TX);
}
/****************************************************************************
* Name: up_ledon
****************************************************************************/
void up_ledon(int led)
{
switch (led)
{
/* 0: LED_STARTED, LED_HEAPALLOCATE, LED_IRQSENABLED: L=OFF TX=OFF
* RX=OFF
*
* Since the LEDs were initially all OFF and since this state only
* occurs one time, nothing need be done.
*/
default:
case 0:
break;
/* 1: LED_STACKCREATED: L=ON TX=OFF RX=OFF
*
* This case will also occur only once. Note that unlike the other
* LEDs, LED L is active high.
*/
case 1:
sam_gpiowrite(GPIO_LED_L, true);
break;
/* 2: LED_INIRQ, LED_SIGNAL, LED_ASSERTION: L=N/C TX=ON RX=N/C
*
* This case will occur many times. LED TX is active low.
*/
case 2:
sam_gpiowrite(GPIO_LED_TX, false);
break;
/* 3: LED_PANIC: L=N/X TX=N/C RX=ON
*
* This case will also occur many times. LED RX is active low.
*/
case 3:
sam_gpiowrite(GPIO_LED_RX, false);
break;
}
}
/****************************************************************************
* Name: up_ledoff
****************************************************************************/
void up_ledoff(int led)
{
switch (led)
{
/* 0: LED_STARTED, LED_HEAPALLOCATE, LED_IRQSENABLED: L=OFF TX=OFF
* RX=OFF
* 1: LED_STACKCREATED: L=ON TX=OFF RX=OFF
*
* These cases should never happen.
*/
default:
case 1:
case 0:
break;
/* 2: LED_INIRQ, LED_SIGNAL, LED_ASSERTION: L=N/C TX=OFF RX=N/C
*
* This case will occur many times. LED TX is active low.
*/
case 2:
sam_gpiowrite(GPIO_LED_TX, true);
break;
/* 3: LED_PANIC: L=N/X TX=N/C RX=OFF
*
* This case will also occur many times. LED RX is active low.
*/
case 3:
sam_gpiowrite(GPIO_LED_RX, true);
break;
}
}
#endif /* CONFIG_ARCH_LEDS */
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