RGB LED driver
This commit is contained in:
Alan Carvalho de Assis
Gregory Nutt
parent
7cb35587a3
commit
ea15ead6cc
@ -41,6 +41,13 @@ config USERLED_LOWER
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endif # USERLED
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config RGBLED
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bool "RGB LED Driver Support"
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default n
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---help---
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This selection enables building of the "upper-half" RGB LED driver.
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See include/nuttx/rgbled.h for further PWM driver information.
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config PCA9635PW
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bool "PCA9635PW I2C LED Driver"
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default n
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@ -50,6 +50,12 @@ endif
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LEDVPATH = :leds
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endif
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ifeq ($(CONFIG_RGBLED),y)
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CSRCS += rgbled.c
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LEDDEPATH = --dep-path leds
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LEDVPATH = :leds
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endif
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ifeq ($(CONFIG_PCA9635PW),y)
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CSRCS += pca9635pw.c
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LEDDEPATH = --dep-path leds
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417
drivers/leds/rgbled.c
Normal file
417
drivers/leds/rgbled.c
Normal file
@ -0,0 +1,417 @@
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/****************************************************************************
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* drivers/rgbled.c
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Alan Carvalho de Assis <acassis@gmail.com>
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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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/****************************************************************************
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* Compilation Switches
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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 <sys/types.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <semaphore.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/arch.h>
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#include <nuttx/pwm.h>
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#include <nuttx/leds/rgbled.h>
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#include <arch/irq.h>
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#ifdef CONFIG_RGBLED
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Debug ********************************************************************/
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/* Non-standard debug that may be enabled just for testing PWM */
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#ifdef CONFIG_DEBUG_RGBLED
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# define pwmdbg dbg
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# define pwmvdbg vdbg
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# define pwmlldbg lldbg
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# define pwmllvdbg llvdbg
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#else
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# define pwmdbg(x...)
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# define pwmvdbg(x...)
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# define pwmlldbg(x...)
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# define pwmllvdbg(x...)
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#endif
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/****************************************************************************
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* Private Type Definitions
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****************************************************************************/
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/* This structure describes the state of the upper half driver */
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struct rgbled_upperhalf_s
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{
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uint8_t crefs; /* The number of times the device has been opened */
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volatile bool started; /* True: pulsed output is being generated */
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sem_t exclsem; /* Supports mutual exclusion */
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struct pwm_info_s ledr; /* Pulsed output for LED R*/
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struct pwm_info_s ledg; /* Pulsed output for LED G*/
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struct pwm_info_s ledb; /* Pulsed output for LED B*/
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struct pwm_lowerhalf_s *devledr;
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struct pwm_lowerhalf_s *devledg;
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struct pwm_lowerhalf_s *devledb;
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int rgbled_open(FAR struct file *filep);
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static int rgbled_close(FAR struct file *filep);
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static ssize_t rgbled_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t rgbled_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_rgbledops =
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{
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rgbled_open, /* open */
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rgbled_close, /* close */
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rgbled_read, /* read */
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rgbled_write, /* write */
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0, /* seek */
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0 /* ioctl */
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#ifndef CONFIG_DISABLE_POLL
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, 0 /* poll */
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#endif
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: rgbled_open
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*
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* Description:
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* This function is called whenever the PWM device is opened.
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*
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****************************************************************************/
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static int rgbled_open(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct rgbled_upperhalf_s *upper = inode->i_private;
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uint8_t tmp;
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int ret;
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pwmvdbg("crefs: %d\n", upper->crefs);
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/* Get exclusive access to the device structures */
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ret = sem_wait(&upper->exclsem);
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if (ret < 0)
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{
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ret = -get_errno();
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goto errout;
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}
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/* Increment the count of references to the device. If this the first
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* time that the driver has been opened for this device, then initialize
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* the device.
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*/
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tmp = upper->crefs + 1;
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if (tmp == 0)
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{
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/* More than 255 opens; uint8_t overflows to zero */
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ret = -EMFILE;
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goto errout_with_sem;
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}
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/* Save the new open count on success */
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upper->crefs = tmp;
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ret = OK;
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errout_with_sem:
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sem_post(&upper->exclsem);
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errout:
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return ret;
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}
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/****************************************************************************
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* Name: rgbled_close
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*
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* Description:
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* This function is called when the PWM device is closed.
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*
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****************************************************************************/
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static int rgbled_close(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct rgbled_upperhalf_s *upper = inode->i_private;
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int ret;
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pwmvdbg("crefs: %d\n", upper->crefs);
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/* Get exclusive access to the device structures */
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ret = sem_wait(&upper->exclsem);
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if (ret < 0)
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{
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ret = -get_errno();
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goto errout;
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}
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/* Decrement the references to the driver. If the reference count will
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* decrement to 0, then uninitialize the driver.
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*/
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if (upper->crefs > 1)
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{
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upper->crefs--;
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}
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sem_post(&upper->exclsem);
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ret = OK;
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errout:
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return ret;
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}
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/****************************************************************************
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* Name: rgbled_read
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*
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* Description:
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* A dummy read method. This is provided only to satisfy the VFS layer.
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*
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****************************************************************************/
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static ssize_t rgbled_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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/* Return zero -- usually meaning end-of-file */
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return 0;
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}
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/****************************************************************************
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* Name: rgbled_write
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*
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* Description:
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* A dummy write method. This is provided only to satisfy the VFS layer.
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*
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****************************************************************************/
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static ssize_t rgbled_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct rgbled_upperhalf_s *upper = inode->i_private;
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FAR struct pwm_lowerhalf_s *ledr = upper->devledr;
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FAR struct pwm_lowerhalf_s *ledg = upper->devledg;
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FAR struct pwm_lowerhalf_s *ledb = upper->devledb;
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unsigned int red;
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unsigned int green;
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unsigned int blue;
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char color[3];
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/* We need to receive a string #RRGGBB = 7 bytes */
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if (buffer == NULL || buflen < 7)
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{
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/* Well... nothing to do */
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return -EINVAL;
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}
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/* Check if it is a color format */
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if (buffer[0] != '#')
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{
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/* The color code needs to start with # */
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return -EINVAL;
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}
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/* Move buffer to next character */
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buffer++;
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color[0] = buffer[0];
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color[1] = buffer[1];
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color[2] = '\0';
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red = strtol(color, NULL, 16);
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color[0] = buffer[2];
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color[1] = buffer[3];
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color[2] = '\0';
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green = strtol(color, NULL, 16);
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color[0] = buffer[4];
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color[1] = buffer[5];
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color[2] = '\0';
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blue = strtol(color, NULL, 16);
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/* Sane check */
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if (red > 255)
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{
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red = 255;
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}
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if (green > 255)
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{
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green = 255;
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}
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if (blue > 255)
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{
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blue = 255;
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}
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/* Convert 8bit to 16bits */
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red <<= 8;
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green <<= 8;
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blue <<= 8;
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/* Setup LED R */
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upper->ledr.frequency = 100;
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upper->ledr.duty = red;
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ledr->ops->start(ledr, &upper->ledr);
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/* Setup LED G */
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upper->ledg.frequency = 100;
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upper->ledg.duty = green;
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ledg->ops->start(ledg, &upper->ledg);
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/* Setup LED B */
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upper->ledb.frequency = 100;
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upper->ledb.duty = blue;
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ledb->ops->start(ledb, &upper->ledb);
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return buflen;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: rgbled_register
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*
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* Description:
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* This function binds three instances of a "lower half" PWM driver with
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* the "upper half" RGB LED device and registers that device so that can
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* be used by application code.
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*
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*
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* Input parameters:
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* path - The full path to the driver to be registers in the NuttX pseudo-
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* filesystem. The recommended convention is to name all PWM drivers
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* as "/dev/rgdbled0", "/dev/rgbled1", etc. where the driver path
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* differs only in the "minor" number at the end of the device name.
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* ledr, ledg, and ledb - A pointer to an instance of lower half PWM
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* drivers for the red, green, and blue LEDs, respectively. These
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* instances will be bound to the RGB LED driver and must persists as
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* long as that driver persists.
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*
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* Returned Value:
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* Zero on success; a negated errno value on failure.
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*
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****************************************************************************/
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int rgbled_register(FAR const char *path, FAR struct pwm_lowerhalf_s *ledr,
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FAR struct pwm_lowerhalf_s *ledg,
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FAR struct pwm_lowerhalf_s *ledb)
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{
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FAR struct rgbled_upperhalf_s *upper;
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/* Allocate the upper-half data structure */
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upper = (FAR struct rgbled_upperhalf_s *)
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kmm_zalloc(sizeof(struct rgbled_upperhalf_s));
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if (!upper)
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{
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pwmdbg("Allocation failed\n");
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return -ENOMEM;
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}
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/* Initialize the PWM device structure (it was already zeroed by
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* kmm_zalloc())
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*/
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sem_init(&upper->exclsem, 0, 1);
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upper->devledr = ledr;
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upper->devledg = ledg;
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upper->devledb = ledb;
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/* Register the PWM device */
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pwmvdbg("Registering %s\n", path);
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return register_driver(path, &g_rgbledops, 0666, upper);
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}
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#endif /* CONFIG_RGBLED */
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99
include/nuttx/leds/rgbled.h
Normal file
99
include/nuttx/leds/rgbled.h
Normal file
@ -0,0 +1,99 @@
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/****************************************************************************
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* include/nuttx/rgbled.h
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Alan Carvalho de Assis <acassis@gmail.com>
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*
|
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* 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.
|
||||
*
|
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_LEDS_RGBLED_H
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#define __INCLUDE_NUTTX_LEDS_RGBLED_H
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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 <nuttx/compiler.h>
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#include <fixedmath.h>
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#include <nuttx/pwm.h>
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#include <nuttx/fs/ioctl.h>
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#ifdef CONFIG_RGBLED
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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|
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/****************************************************************************
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* Name: rgbled_register
|
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*
|
||||
* Description:
|
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* This function binds three instances of a "lower half" PWM driver with
|
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* the "upper half" RGB LED device and registers that device so that can
|
||||
* be used by application code.
|
||||
*
|
||||
*
|
||||
* Input parameters:
|
||||
* path - The full path to the driver to be registers in the NuttX pseudo-
|
||||
* filesystem. The recommended convention is to name all PWM drivers
|
||||
* as "/dev/rgdbled0", "/dev/rgbled1", etc. where the driver path
|
||||
* differs only in the "minor" number at the end of the device name.
|
||||
* ledr, ledg, and ledb - A pointer to an instance of lower half PWM
|
||||
* drivers for the red, green, and blue LEDs, respectively. These
|
||||
* instances will be bound to the RGB LED driver and must persists as
|
||||
* long as that driver persists.
|
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*
|
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* Returned Value:
|
||||
* Zero on success; a negated errno value on failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int rgbled_register(FAR const char *path, FAR struct pwm_lowerhalf_s *ledr,
|
||||
FAR struct pwm_lowerhalf_s *ledg,
|
||||
FAR struct pwm_lowerhalf_s *ledb);
|
||||
|
||||
#undef EXTERN
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* CONFIG_RGBLED */
|
||||
#endif /* __INCLUDE_NUTTX_LEDS_RGBLED_H */
|
||||
Loading…
Reference in New Issue
Block a user