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boards/xtensa/esp32/esp32-wrover-kit: Add an example on how to use GPIO

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interrupts.

This example uses the GPIO driver with the 3 on board LEDs outputs and one input
as an interrupt pin.

Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>
This commit is contained in:
Abdelatif Guettouche 2021-01-11 17:32:24 +01:00 committed by Alin Jerpelea
parent c00141c41a
commit 6875207985
6 changed files with 399 additions and 0 deletions
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52
boards/xtensa/esp32/esp32-wrover-kit/configs/gpio/defconfig Normal file
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@ -0,0 +1,52 @@
#
# This file is autogenerated: PLEASE DO NOT EDIT IT.
#
# You can use "make menuconfig" to make any modifications to the installed .config file.
# You can then do "make savedefconfig" to generate a new defconfig file that includes your
# modifications.
#
# CONFIG_ARCH_LEDS is not set
# CONFIG_NSH_ARGCAT is not set
# CONFIG_NSH_CMDOPT_HEXDUMP is not set
# CONFIG_NSH_CMDPARMS is not set
CONFIG_ARCH="xtensa"
CONFIG_ARCH_BOARD="esp32-wrover-kit"
CONFIG_ARCH_BOARD_ESP32_WROVERKIT=y
CONFIG_ARCH_CHIP="esp32"
CONFIG_ARCH_CHIP_ESP32=y
CONFIG_ARCH_STACKDUMP=y
CONFIG_ARCH_XTENSA=y
CONFIG_BOARD_LOOPSPERMSEC=16717
CONFIG_BUILTIN=y
CONFIG_DEV_GPIO=y
CONFIG_ESP32_GPIO_IRQ=y
CONFIG_ESP32_UART0=y
CONFIG_EXAMPLES_GPIO=y
CONFIG_FS_PROCFS=y
CONFIG_HAVE_CXX=y
CONFIG_HAVE_CXXINITIALIZE=y
CONFIG_IDLETHREAD_STACKSIZE=3072
CONFIG_INTELHEX_BINARY=y
CONFIG_MAX_TASKS=16
CONFIG_MM_REGIONS=2
CONFIG_NFILE_DESCRIPTORS=8
CONFIG_NSH_ARCHINIT=y
CONFIG_NSH_BUILTIN_APPS=y
CONFIG_NSH_FILEIOSIZE=512
CONFIG_NSH_LINELEN=64
CONFIG_NSH_READLINE=y
CONFIG_PREALLOC_TIMERS=4
CONFIG_RAM_SIZE=114688
CONFIG_RAM_START=0x20000000
CONFIG_RAW_BINARY=y
CONFIG_RR_INTERVAL=200
CONFIG_SCHED_WAITPID=y
CONFIG_SDCLONE_DISABLE=y
CONFIG_SPI=y
CONFIG_START_DAY=6
CONFIG_START_MONTH=12
CONFIG_START_YEAR=2011
CONFIG_SYSTEM_NSH=y
CONFIG_UART0_SERIAL_CONSOLE=y
CONFIG_USER_ENTRYPOINT="nsh_main"
CONFIG_XTENSA_INTBACKTRACE=y

5
boards/xtensa/esp32/esp32-wrover-kit/include/board.h
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@ -105,4 +105,9 @@
#define LED_ASSERTION 6 /* LED1 + LED2 + LED3 */
#define LED_PANIC 7 /* LED1 + N/C + N/C */
/* GPIO pins used by the GPIO Subsystem */
#define BOARD_NGPIOOUT 3 /* Amount of GPIO Output pins */
#define BOARD_NGPIOINT 1 /* Amount of GPIO Input w/ Interruption pins */
#endif /* __BOARDS_XTENSA_ESP32_ESP32_WROVER_KIT_INCLUDE_BOARD_H */

4
boards/xtensa/esp32/esp32-wrover-kit/src/Make.defs
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@ -51,6 +51,10 @@ ifeq ($(CONFIG_ESP32_SPIFLASH),y)
CSRCS += esp32_spiflash.c
endif
ifeq ($(CONFIG_DEV_GPIO),y)
CSRCS += esp32_gpio.c
endif
SCRIPTIN = $(SCRIPTDIR)$(DELIM)esp32.template.ld
SCRIPTOUT = $(SCRIPTDIR)$(DELIM)esp32_out.ld

8
boards/xtensa/esp32/esp32-wrover-kit/src/esp32-wrover-kit.h
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@ -108,5 +108,13 @@ int esp32_spiflash_init(void);
void esp32_spiflash_encrypt_test(void);
#endif
/****************************************************************************
* Name: esp32_gpio_init
****************************************************************************/
#ifdef CONFIG_DEV_GPIO
int esp32_gpio_init(void);
#endif
#endif /* __ASSEMBLY__ */
#endif /* __BOARDS_XTENSA_ESP32_ESP32_WROVERKIT_SRC_ESP32_WROVERKIT_H */

9
boards/xtensa/esp32/esp32-wrover-kit/src/esp32_bringup.c
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@ -241,6 +241,15 @@ int esp32_bringup(void)
}
#endif
#ifdef CONFIG_DEV_GPIO
ret = esp32_gpio_init();
if (ret < 0)
{
syslog(LOG_ERR, "Failed to initialize GPIO Driver: %d\n", ret);
return ret;
}
#endif
/* If we got here then perhaps not all initialization was successful, but
* at least enough succeeded to bring-up NSH with perhaps reduced
* capabilities.

321
boards/xtensa/esp32/esp32-wrover-kit/src/esp32_gpio.c Normal file
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@ -0,0 +1,321 @@
/****************************************************************************
* boards/xtensa/esp32-wrover-kit/src/esp32_gpio.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <syslog.h>
#include <nuttx/irq.h>
#include <arch/irq.h>
#include <debug.h>
#include <nuttx/ioexpander/gpio.h>
#include <arch/board/board.h>
#include "esp32-wrover-kit.h"
#include "esp32_gpio.h"
#include "rom/esp32_gpio.h"
#include "hardware/esp32_gpio_sigmap.h"
#if defined(CONFIG_DEV_GPIO) && !defined(CONFIG_GPIO_LOWER_HALF)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#if !defined(CONFIG_ESP32_GPIO_IRQ) && BOARD_NGPIOINT > 0
# error "NGPIOINT is > 0 and GPIO interrupts aren't enabled"
#endif
/* Interrupt pins. GPIO22 is used as an example, any other inputs could be
* used.
*/
#define GPIO_IRQPIN 22
/****************************************************************************
* Private Types
****************************************************************************/
struct esp32gpio_dev_s
{
struct gpio_dev_s gpio;
uint8_t id;
};
struct esp32gpint_dev_s
{
struct esp32gpio_dev_s esp32gpio;
pin_interrupt_t callback;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
#if BOARD_NGPIOOUT > 0
static int gpout_read(FAR struct gpio_dev_s *dev, FAR bool *value);
static int gpout_write(FAR struct gpio_dev_s *dev, bool value);
#endif
#if BOARD_NGPIOINT > 0
static int gpint_read(FAR struct gpio_dev_s *dev, FAR bool *value);
static int gpint_attach(FAR struct gpio_dev_s *dev,
pin_interrupt_t callback);
static int gpint_enable(FAR struct gpio_dev_s *dev, bool enable);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
#if BOARD_NGPIOOUT > 0
static const struct gpio_operations_s gpout_ops =
{
.go_read = gpout_read,
.go_write = gpout_write,
.go_attach = NULL,
.go_enable = NULL,
};
/* This array maps the GPIO pins used as OUTPUT */
static const uint32_t g_gpiooutputs[BOARD_NGPIOOUT] =
{
GPIO_LED1, GPIO_LED2, GPIO_LED3
};
static struct esp32gpio_dev_s g_gpout[BOARD_NGPIOOUT];
#endif
#if BOARD_NGPIOINT > 0
static const struct gpio_operations_s gpint_ops =
{
.go_read = gpint_read,
.go_write = NULL,
.go_attach = gpint_attach,
.go_enable = gpint_enable,
};
/* This array maps the GPIO pins used as INTERRUPT INPUTS */
static const uint32_t g_gpiointinputs[BOARD_NGPIOINT] =
{
GPIO_IRQPIN,
};
static struct esp32gpint_dev_s g_gpint[BOARD_NGPIOINT];
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: gpout_read
****************************************************************************/
#if BOARD_NGPIOOUT > 0
static int gpout_read(FAR struct gpio_dev_s *dev, FAR bool *value)
{
FAR struct esp32gpio_dev_s *esp32gpio = (FAR struct esp32gpio_dev_s *)dev;
DEBUGASSERT(esp32gpio != NULL && value != NULL);
DEBUGASSERT(esp32gpio->id < BOARD_NGPIOOUT);
gpioinfo("Reading...\n");
*value = esp32_gpioread(g_gpiooutputs[esp32gpio->id]);
return OK;
}
/****************************************************************************
* Name: gpout_write
****************************************************************************/
static int gpout_write(FAR struct gpio_dev_s *dev, bool value)
{
FAR struct esp32gpio_dev_s *esp32gpio = (FAR struct esp32gpio_dev_s *)dev;
DEBUGASSERT(esp32gpio != NULL);
DEBUGASSERT(esp32gpio->id < BOARD_NGPIOOUT);
gpioinfo("Writing %d\n", (int)value);
esp32_gpiowrite(g_gpiooutputs[esp32gpio->id], value);
return OK;
}
#endif
/****************************************************************************
* Name: esp32gpio_interrupt
****************************************************************************/
#if BOARD_NGPIOINT > 0
static int esp32gpio_interrupt(int irq, void *context, void *arg)
{
FAR struct esp32gpint_dev_s *esp32gpint =
(FAR struct esp32gpint_dev_s *)arg;
DEBUGASSERT(esp32gpint != NULL && esp32gpint->callback != NULL);
gpioinfo("Interrupt! callback=%p\n", esp32gpint->callback);
esp32gpint->callback(&esp32gpint->esp32gpio.gpio,
esp32gpint->esp32gpio.id);
return OK;
}
/****************************************************************************
* Name: gpint_read
****************************************************************************/
static int gpint_read(FAR struct gpio_dev_s *dev, FAR bool *value)
{
FAR struct esp32gpint_dev_s *esp32gpint =
(FAR struct esp32gpint_dev_s *)dev;
DEBUGASSERT(esp32gpint != NULL && value != NULL);
DEBUGASSERT(esp32gpint->esp32gpio.id < BOARD_NGPIOINT);
gpioinfo("Reading int pin...\n");
*value = esp32_gpioread(g_gpiointinputs[esp32gpint->esp32gpio.id]);
return OK;
}
/****************************************************************************
* Name: gpint_attach
****************************************************************************/
static int gpint_attach(FAR struct gpio_dev_s *dev,
pin_interrupt_t callback)
{
FAR struct esp32gpint_dev_s *esp32gpint =
(FAR struct esp32gpint_dev_s *)dev;
int irq = ESP32_PIN2IRQ(g_gpiointinputs[esp32gpint->esp32gpio.id]);
int ret;
gpioinfo("Attaching the callback\n");
/* Make sure the interrupt is disabled */
esp32_gpioirqdisable(irq);
ret = irq_attach(irq,
esp32gpio_interrupt,
&g_gpint[esp32gpint->esp32gpio.id]);
if (ret < 0)
{
syslog(LOG_ERR, "ERROR: gpint_attach() failed: %d\n", ret);
return ret;
}
gpioinfo("Attach %p\n", callback);
esp32gpint->callback = callback;
return OK;
}
/****************************************************************************
* Name: gpint_enable
****************************************************************************/
static int gpint_enable(FAR struct gpio_dev_s *dev, bool enable)
{
FAR struct esp32gpint_dev_s *esp32gpint =
(FAR struct esp32gpint_dev_s *)dev;
int irq = ESP32_PIN2IRQ(g_gpiointinputs[esp32gpint->esp32gpio.id]);
if (enable)
{
if (esp32gpint->callback != NULL)
{
gpioinfo("Enabling the interrupt\n");
/* Configure the interrupt for rising edge */
esp32_gpioirqenable(irq, RISING);
}
}
else
{
gpioinfo("Disable the interrupt\n");
esp32_gpioirqdisable(irq);
}
return OK;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: esp32_gpio_init
****************************************************************************/
int esp32_gpio_init(void)
{
int i;
int pincount = 0;
#if BOARD_NGPIOOUT > 0
for (i = 0; i < BOARD_NGPIOOUT; i++)
{
/* Setup and register the GPIO pin */
g_gpout[i].gpio.gp_pintype = GPIO_OUTPUT_PIN;
g_gpout[i].gpio.gp_ops = &gpout_ops;
g_gpout[i].id = i;
gpio_pin_register(&g_gpout[i].gpio, pincount);
/* Configure the pins that will be used as output */
gpio_matrix_out(g_gpiooutputs[i], SIG_GPIO_OUT_IDX, 0, 0);
esp32_configgpio(g_gpiooutputs[i], OUTPUT_FUNCTION_3);
esp32_gpiowrite(g_gpiooutputs[i], 0);
pincount++;
}
#endif
#if BOARD_NGPIOINT > 0
for (i = 0; i < BOARD_NGPIOINT; i++)
{
/* Setup and register the GPIO pin */
g_gpint[i].esp32gpio.gpio.gp_pintype = GPIO_INTERRUPT_PIN;
g_gpint[i].esp32gpio.gpio.gp_ops = &gpint_ops;
g_gpint[i].esp32gpio.id = i;
gpio_pin_register(&g_gpint[i].esp32gpio.gpio, pincount);
/* Configure the pins that will be used as interrupt input */
esp32_configgpio(g_gpiointinputs[i], INPUT_FUNCTION_3 | PULLDOWN);
pincount++;
}
#endif
return OK;
}
#endif /* CONFIG_DEV_GPIO && !CONFIG_GPIO_LOWER_HALF */