153 lines
5.3 KiB
C
153 lines
5.3 KiB
C
/****************************************************************************
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* boards/arm/samd2l2/samd20-xplained/src/sam_autoleds.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* There are three LEDs on board the SAMD20 Xplained Pro board: The EDBG
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* controls two of the LEDs, a power LED and a status LED. There is only
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* one user controllable LED, a yellow LED labelled STATUS near the SAMD20
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* USB connector.
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*
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* This LED is controlled by PA14 and the LED can be activated by driving
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* PA14 to GND.
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*
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* When CONFIG_ARCH_LEDS is defined in the NuttX configuration, NuttX will
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* control the LED as follows:
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*
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* SYMBOL Meaning LED
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* ------------------- ----------------------- ------
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* LED_STARTED NuttX has been started OFF
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* LED_HEAPALLOCATE Heap has been allocated OFF
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* LED_IRQSENABLED Interrupts enabled OFF
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* LED_STACKCREATED Idle stack created ON
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* LED_INIRQ In an interrupt** N/C
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* LED_SIGNAL In a signal handler*** N/C
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* LED_ASSERTION An assertion failed N/C
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* LED_PANIC The system has crashed FLASH
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*
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* Thus if the LED is statically on, NuttX has successfully booted and is,
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* apparently, running normally. If the LED is flashing at approximately
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* 2Hz, then a fatal error has been detected and the system 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 <assert.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_port.h"
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#include "samd20-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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sam_configport(PORT_STATUS_LED);
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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 ledstate = true;
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switch (led)
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{
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case 0: /* LED_STARTED: NuttX has been started STATUS LED=OFF
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* LED_HEAPALLOCATE: Heap has been allocated STATUS LED=OFF
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* LED_IRQSENABLED: Interrupts enabled STATUS LED=OFF
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*/
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break; /* Leave ledstate == true to turn OFF */
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default:
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case 2: /* LED_INIRQ: In an interrupt STATUS LED=N/C
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* LED_SIGNAL: In a signal handler STATUS LED=N/C
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* LED_ASSERTION: An assertion failed STATUS LED=N/C
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*/
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return; /* Return to leave STATUS LED unchanged */
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case 3: /* LED_PANIC: The system has crashed STATUS LED=FLASH */
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case 1: /* LED_STACKCREATED: Idle stack created STATUS LED=ON */
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ledstate = false; /* Set ledstate == false to turn ON */
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break;
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}
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sam_portwrite(PORT_STATUS_LED, ledstate);
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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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switch (led)
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{
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/* These should not happen and are ignored */
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default:
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case 0: /* LED_STARTED: NuttX has been started STATUS LED=OFF
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* LED_HEAPALLOCATE: Heap has been allocated STATUS LED=OFF
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* LED_IRQSENABLED: Interrupts enabled STATUS LED=OFF
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*/
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case 1: /* LED_STACKCREATED: Idle stack created STATUS LED=ON */
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/* These result in no-change */
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case 2: /* LED_INIRQ: In an interrupt STATUS LED=N/C
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* LED_SIGNAL: In a signal handler STATUS LED=N/C
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* LED_ASSERTION: An assertion failed STATUS LED=N/C
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*/
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return; /* Return to leave STATUS LED unchanged */
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/* Turn STATUS LED off set driving the output high */
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case 3: /* LED_PANIC: The system has crashed STATUS LED=FLASH */
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sam_portwrite(PORT_STATUS_LED, true);
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break;
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}
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}
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#endif /* CONFIG_ARCH_LEDS */
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