151 lines
5.6 KiB
C
151 lines
5.6 KiB
C
/****************************************************************************
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* configs/sama5d3-xplained/src/sam_autoleds.c
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*
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* Copyright (C) 2014-2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/* There are two LEDs on the SAMA5D3 series-CM board that can be controlled
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* by software. A blue LED is controlled via PIO pins. A red LED normally
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* provides an indication that power is supplied to the board but can also
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* be controlled via software.
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*
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* PE25. This blue LED is pulled high and is illuminated by pulling PE25
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* low.
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*
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* PE24. The red LED is also pulled high but is driven by a transistor so
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* that it is illuminated when power is applied even if PE24 is not
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* configured as an output. If PE24 is configured as an output, then the
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* LCD is illuminated by a low output.
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*
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* These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
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* defined. In that case, the usage by the board port is defined in
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* include/board.h and src/sam_leds.c. The LEDs are used to encode OS-related
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* events as follows:
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*
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* SYMBOL Val Meaning LED state
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* Blue Red
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* ----------------- --- ----------------------- -------- --------
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* LED_STARTED 0 NuttX has been started OFF OFF
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* LED_HEAPALLOCATE 0 Heap has been allocated OFF OFF
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* LED_IRQSENABLED 0 Interrupts enabled OFF OFF
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* LED_STACKCREATED 1 Idle stack created ON OFF
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* LED_INIRQ 2 In an interrupt No change
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* LED_SIGNAL 2 In a signal handler No change
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* LED_ASSERTION 2 An assertion failed No change
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* LED_PANIC 3 The system has crashed OFF Blinking
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* LED_IDLE N/A MCU is is sleep mode Not used
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*
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* Thus if the blue LED is statically on, NuttX has successfully booted and
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* is, apparently, running normally. If the red is flashing at
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* approximately 2Hz, then a fatal error has been detected and the system
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* has halted.
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <debug.h>
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#include <nuttx/board.h>
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#include <arch/board/board.h>
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#include "sam_pio.h"
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#include "sama5d3-xplained.h"
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#ifdef CONFIG_ARCH_LEDS
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: board_autoled_initialize
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****************************************************************************/
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void board_autoled_initialize(void)
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{
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/* Configure LED PIOs for output */
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sam_configpio(PIO_BLUE);
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sam_configpio(PIO_RED);
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}
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/****************************************************************************
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* Name: board_autoled_on
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****************************************************************************/
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void board_autoled_on(int led)
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{
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bool blueoff = true; /* Low illuminates */
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bool redon = false; /* High illuminates */
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switch (led)
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{
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case 0: /* LED_STARTED, LED_HEAPALLOCATE, LED_IRQSENABLED */
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break;
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case 1: /* LED_STACKCREATED */
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blueoff = false;
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break;
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default:
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case 2: /* LED_INIRQ, LED_SIGNAL, LED_ASSERTION */
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return;
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case 3: /* LED_PANIC */
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redon = true;
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break;
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}
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sam_piowrite(PIO_BLUE, blueoff);
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sam_piowrite(PIO_RED, redon);
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}
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/****************************************************************************
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* Name: board_autoled_off
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****************************************************************************/
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void board_autoled_off(int led)
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{
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if (led != 2)
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{
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sam_piowrite(PIO_BLUE, true); /* Low illuminates */
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sam_piowrite(PIO_RED, false); /* High illuminates */
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}
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}
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#endif /* CONFIG_ARCH_LEDS */
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