nuttx/nuttx-update
1
2
Fork 1
Code Issues 1 Pull requests 1 Projects Releases Packages Wiki Activity Actions

EFM32: Add buton interrupt handling for the Olimex board

Browse source
This commit is contained in:
Gregory Nutt 2014-10-21 13:51:30 -06:00
parent b8d841c9d2
commit 33015d6018
6 changed files with 307 additions and 25 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
configs/Kconfig
View file

@ -367,6 +367,7 @@ config ARCH_BOARD_OLIMEX_EFM32G880F128_STK
bool "Olimex EFM32G880F128 STK"
depends on ARCH_CHIP_EFM32G880F128
select ARCH_HAVE_BUTTONS
select ARCH_HAVE_IRQBUTTONS
---help---
This options selects the Olimex EFM32G880F128 STK

16
configs/olimex-efm32g880f128-stk/README.txt
View file

@ -46,6 +46,22 @@ LEDs
The EFM32G880F128-STK has no user controllable LEDs.
Buttons
=======
The Olimex board has four buttons, BUT1-4. Each is grounded and so should
have a weak pull-up so that it will be sensed as "1" when open and "0"
when closed.
--------------------- ---------------------
PIN CONNECTIONS
--------------------- ---------------------
PE0/PCNT0_S0IN/U0_TX BUT1, EXT-18
PE1/PCNT0_S1IN/U0_RX BUT2, EXT-19
PE2/ACMP0_O BUT3, EXT-20
E3/ACMP1_O BUT4, EXT-21
--------------------- ---------------------
Serial Console
==============

26
configs/olimex-efm32g880f128-stk/include/board.h
View file

@ -204,6 +204,32 @@
#define LED_ASSERTION 6 /* LED1 + LED2 + LED3 */
#define LED_PANIC 7 /* N/C + N/C + N/C + LED4 */
/* Buttons ******************************************************************/
/* The Olimex board has four buttons, BUT1-4. Each is grounded and so should
* have a weak pull-up so that it will be sensed as "1" when open and "0"
* when closed.
*
* --------------------- ---------------------
* PIN CONNECTIONS
* --------------------- ---------------------
* PE0/PCNT0_S0IN/U0_TX BUT1, EXT-18
* PE1/PCNT0_S1IN/U0_RX BUT2, EXT-19
* PE2/ACMP0_O BUT3, EXT-20
* PE3/ACMP1_O BUT4, EXT-21
* --------------------- ---------------------
*/
#define BUTTON_1 0
#define BUTTON_2 1
#define BUTTON_3 2
#define BUTTON_4 3
#define NUM_BUTTONS 4
#define BUTTON_1_BIT (1 << BUTTON_1)
#define BUTTON_2_BIT (1 << BUTTON_2)
#define BUTTON_3_BIT (1 << BUTTON_3)
#define BUTTON_4_BIT (1 << BUTTON_4)
/* Pin routing **************************************************************/
/* UART0:
*

4
configs/olimex-efm32g880f128-stk/src/Makefile
View file

@ -37,6 +37,10 @@
CSRCS = efm32_boot.c
ifeq ($(CONFIG_ARCH_BUTTONS),y)
CSRCS += efm32_buttons.c
endif
COBJS = $(CSRCS:.c=$(OBJEXT))
SRCS = $(ASRCS) $(CSRCS)
OBJS = $(AOBJS) $(COBJS)

227
configs/olimex-efm32g880f128-stk/src/efm32_buttons.c Normal file
View file

@ -0,0 +1,227 @@
/****************************************************************************
* configs/olimex-efm32g880f128-stk/src/efm32_buttons.c
*
* Copyright (C) 2014 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.
*
****************************************************************************/
/* The Olimex board has four buttons, BUT1-4. Each is grounded and so should
* have a weak pull-up so that it will be sensed as "1" when open and "0"
* when closed.
*
* --------------------- ---------------------
* PIN CONNECTIONS
* --------------------- ---------------------
* PE0/PCNT0_S0IN/U0_TX BUT1, EXT-18
* PE1/PCNT0_S1IN/U0_RX BUT2, EXT-19
* PE2/ACMP0_O BUT3, EXT-20
* E3/ACMP1_O BUT4, EXT-21
* --------------------- ---------------------
*/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <nuttx/arch.h>
#include <nuttx/irq.h>
#include <arch/irq.h>
#include <arch/board/board.h>
#include "efm32_gpio.h"
#include "efm32g880f128-stk.h"
#if CONFIG_ARCH_BUTTONS
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
#if defined(CONFIG_EFM32_GPIO_IRQ) && defined(CONFIG_ARCH_IRQBUTTONS)
#if 0 /* REVISIT -- See comments in board_button_irq() */
static xcpt_t g_button_handlers[NUM_BUTTONS];
#endif
static const uint8_t g_button_irqs[NUM_BUTTONS];
#endif
static const gpio_pinset_t g_button_configs[NUM_BUTTONS] =
{
GPIO_BUTTON_1, GPIO_BUTTON_2, GPIO_BUTTON_3, GPIO_BUTTON_4
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: board_button_initialize
*
* Description:
* board_button_initialize() must be called to initialize button resources.
* After that, board_buttons() may be called to collect the current state
* of all buttons or board_button_irq() may be called to register button
* interrupt handlers.
*
****************************************************************************/
void board_button_initialize(void)
{
int i;
/* Configure each button */
for (i = 0; i < NUM_BUTTONS; i++)
{
(void)efm32_configgpio(g_button_configs[i]);
}
}
/****************************************************************************
* Name: board_buttons
*
* Description:
* After board_button_initialize() has been called, board_buttons() may be
* called to collect the state of all buttons. board_buttons() returns an
* 8-bit bit set with each bit associated with a button. See the BUTTON*
* definitions above for the meaning of each bit in the returned value.
*
****************************************************************************/
uint8_t board_buttons(void)
{
uint8_t ret;
int i;
/* Check each button */
for (i = 0, ret = 0; i < NUM_BUTTONS; i++)
{
/* The button is closed if a low value is sensed */
if (!efm32_gpioread(g_button_configs[i]))
{
ret |= (1 << i);
}
}
return ret;
}
/****************************************************************************
* Name: board_button_irq
*
* Description:
* This function may be called to register an interrupt handler that will
* be called when a button is depressed or released. The ID value is one
* of the BUTTON* definitions provided above. The previous interrupt
* handler address is returned (so that it may restored, if so desired).
*
* Configuration Notes:
* Configuration CONFIG_EFM32_GPIO_IRQ must be selected to enable the
* overall GPIO IRQ feature.
*
* Returned Value:
* This function should return the old interrupt handler value, but
* currently always returns NULL.
*
****************************************************************************/
#if defined(CONFIG_EFM32_GPIO_IRQ) && defined(CONFIG_ARCH_IRQBUTTONS)
xcpt_t board_button_irq(int id, xcpt_t irqhandler)
{
xcpt_t oldhandler = NULL;
if (id >=0 && id < NUM_BUTTONS)
{
irqstate_t flags;
/* Disable interrupts until we are done. This guarantees that the
* following operations are atomic.
*/
flags = irqsave();
/* Get/set the old button handler
*
* REVISIT: Keeping copies of the hander in RAM seems wasteful
* since the OS already has this information internally.
*/
#if 0 /* REVISIT */
oldhandler = g_button_handlers[id];
g_button_handlers[id] = irqhandler;
#else
oldhandler = NULL;
#endif
/* Are we attaching or detaching? */
if (irqhandler != NULL)
{
/* Configure the interrupt */
efm32_gpioirq(g_button_configs[id]);
/* Attach and enable the interrupt */
(void)irq_attach(g_button_irqs[id], irqhandler);
efm32_gpioirqenable(g_button_irqs[id]);
}
else
{
/* Disable and detach the interrupt */
efm32_gpioirqdisable(g_button_irqs[id]);
(void)irq_detach(g_button_irqs[id]);
}
irqrestore(flags);
}
/* Return the old button handler (so that it can be restored) */
return oldhandler;
}
#endif
#endif /* CONFIG_ARCH_BUTTONS */

58
configs/olimex-efm32g880f128-stk/src/efm32g880f128-stk.h
View file

@ -40,36 +40,44 @@
* Included Files
****************************************************************************/
#include <arch/irq.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* LEDs
*
* The EFM32 Gecko Start Kit has four yellow LEDs. These LEDs are connected
* as follows:
*
* ------------------------------------- --------------------
* EFM32 PIN BOARD SIGNALS
* ------------------------------------- --------------------
* C0/USART1_TX#0/PCNT0_S0IN#2/ACMP0_CH0 MCU_PC0 UIF_LED0
* C1/USART1_RX#0/PCNT0_S1IN#2/ACMP0_CH1 MCU_PC1 UIF_LED1
* C2/USART2_TX#0/ACMP0_CH2 MCU_PC2 UIF_LED2
* C3/USART2_RX#0/ACMP0_CH3 MCU_PC3 UIF_LED3
* ------------------------------------- --------------------
*
* All LEDs are grounded and so are illuminated by outputting a high
* value to the LED.
*/
/* Buttons:
*
* The Olimex board has four buttons, BUT1-4. Each is grounded and so should
* have a weak pull-up so that it will be sensed as "1" when open and "0"
* when closed.
*
* --------------------- ---------------------
* PIN CONNECTIONS
* --------------------- ---------------------
* PE0/PCNT0_S0IN/U0_TX BUT1, EXT-18
* PE1/PCNT0_S1IN/U0_RX BUT2, EXT-19
* PE2/ACMP0_O BUT3, EXT-20
* PE3/ACMP1_O BUT4, EXT-21
* --------------------- ---------------------
*/
#define GPIO_LED1 (GPIO_OUTPUT_WIREDOR_PULLDOWN|\
GPIO_OUTPUT_CLEAR|GPIO_PORTC|GPIO_PIN0)
#define GPIO_LED2 (GPIO_OUTPUT_WIREDOR_PULLDOWN|\
GPIO_OUTPUT_CLEAR|GPIO_PORTC|GPIO_PIN1)
#define GPIO_LED3 (GPIO_OUTPUT_WIREDOR_PULLDOWN|\
GPIO_OUTPUT_CLEAR|GPIO_PORTC|GPIO_PIN2)
#define GPIO_LED4 (GPIO_OUTPUT_WIREDOR_PULLDOWN|\
GPIO_OUTPUT_CLEAR|GPIO_PORTC|GPIO_PIN3)
#ifdef CONFIG_EFM32_GPIO_IRQ
# define GPIO_BUTTON_1 (GPIO_INPUT_PULLUP|GPIO_INT_BOTH|GPIO_PORTE|GPIO_PIN0)
# define GPIO_BUTTON_2 (GPIO_INPUT_PULLUP|GPIO_INT_BOTH|GPIO_PORTE|GPIO_PIN1)
# define GPIO_BUTTON_3 (GPIO_INPUT_PULLUP|GPIO_INT_BOTH|GPIO_PORTE|GPIO_PIN2)
# define GPIO_BUTTON_4 (GPIO_INPUT_PULLUP|GPIO_INT_BOTH|GPIO_PORTE|GPIO_PIN3)
# define GPIO_IRQ_BUTTON_1 EFM32_IRQ_EXTI0
# define GPIO_IRQ_BUTTON_2 EFM32_IRQ_EXTI1
# define GPIO_IRQ_BUTTON_3 EFM32_IRQ_EXTI2
# define GPIO_IRQ_BUTTON_4 EFM32_IRQ_EXTI3
#else
# define GPIO_BUTTON_1 (GPIO_INPUT_PULLUP|GPIO_PORTE|GPIO_PIN0)
# define GPIO_BUTTON_2 (GPIO_INPUT_PULLUP|GPIO_PORTE|GPIO_PIN1)
# define GPIO_BUTTON_3 (GPIO_INPUT_PULLUP|GPIO_PORTE|GPIO_PIN2)
# define GPIO_BUTTON_4 (GPIO_INPUT_PULLUP|GPIO_PORTE|GPIO_PIN3)
#endif
/****************************************************************************
* Public Function Prototypes