diff options
Diffstat (limited to 'nuttx/drivers/analog/adc.c')
| -rw-r--r-- | nuttx/drivers/analog/adc.c | 434 |
1 files changed, 0 insertions, 434 deletions
diff --git a/nuttx/drivers/analog/adc.c b/nuttx/drivers/analog/adc.c deleted file mode 100644 index 72f19452a..000000000 --- a/nuttx/drivers/analog/adc.c +++ /dev/null @@ -1,434 +0,0 @@ -/**************************************************************************** - * drivers/analog/adc.c - * - * Copyright (C) 2011 Li Zhuoyi. All rights reserved. - * Author: Li Zhuoyi <lzyy.cn@gmail.com> - * History: 0.1 2011-08-04 initial version - * - * Derived from drivers/can.c - * - * Copyright (C) 2008-2009 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. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include <sys/types.h> -#include <stdint.h> -#include <stdbool.h> -#include <unistd.h> -#include <string.h> -#include <semaphore.h> -#include <fcntl.h> -#include <errno.h> -#include <debug.h> - -#include <nuttx/fs/fs.h> -#include <nuttx/arch.h> -#include <nuttx/analog/adc.h> - -#include <arch/irq.h> - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ - -static int adc_open(FAR struct file *filep); -static int adc_close(FAR struct file *filep); -static ssize_t adc_read(FAR struct file *, FAR char *, size_t); -static ssize_t adc_write(FAR struct file *filep, FAR const char *buffer, size_t buflen); -static int adc_ioctl(FAR struct file *filep,int cmd,unsigned long arg); - -/**************************************************************************** - * Private Data - ****************************************************************************/ - -static const struct file_operations adc_fops = -{ - adc_open, /* open */ - adc_close, /* close */ - adc_read, /* read */ - adc_write, /* write */ - 0, /* seek */ - adc_ioctl /* ioctl */ -#ifndef CONFIG_DISABLE_POLL - , 0 /* poll */ -#endif -}; - -/**************************************************************************** - * Private Functions - ****************************************************************************/ -/************************************************************************************ - * Name: adc_open - * - * Description: - * This function is called whenever the ADC device is opened. - * - ************************************************************************************/ - -static int adc_open(FAR struct file *filep) -{ - FAR struct inode *inode = filep->f_inode; - FAR struct adc_dev_s *dev = inode->i_private; - uint8_t tmp; - int ret = OK; - - /* If the port is the middle of closing, wait until the close is finished */ - - if (sem_wait(&dev->ad_closesem) != OK) - { - ret = -errno; - } - else - { - /* Increment the count of references to the device. If this the first - * time that the driver has been opened for this device, then initialize - * the device. - */ - - tmp = dev->ad_ocount + 1; - if (tmp == 0) - { - /* More than 255 opens; uint8_t overflows to zero */ - - ret = -EMFILE; - } - else - { - /* Check if this is the first time that the driver has been opened. */ - - if (tmp == 1) - { - /* Yes.. perform one time hardware initialization. */ - - irqstate_t flags = irqsave(); - ret = dev->ad_ops->ao_setup(dev); - if (ret == OK) - { - /* Mark the FIFOs empty */ - - dev->ad_recv.af_head = 0; - dev->ad_recv.af_tail = 0; - - /* Finally, Enable the ADC RX interrupt */ - - dev->ad_ops->ao_rxint(dev, true); - - /* Save the new open count on success */ - - dev->ad_ocount = tmp; - } - - irqrestore(flags); - } - } - - sem_post(&dev->ad_closesem); - } - return ret; -} - -/************************************************************************************ - * Name: adc_close - * - * Description: - * This routine is called when the ADC device is closed. - * It waits for the last remaining data to be sent. - * - ************************************************************************************/ - -static int adc_close(FAR struct file *filep) -{ - FAR struct inode *inode = filep->f_inode; - FAR struct adc_dev_s *dev = inode->i_private; - irqstate_t flags; - int ret = OK; - - if (sem_wait(&dev->ad_closesem) != OK) - { - ret = -errno; - } - else - { - /* Decrement the references to the driver. If the reference count will - * decrement to 0, then uninitialize the driver. - */ - - if (dev->ad_ocount > 1) - { - dev->ad_ocount--; - sem_post(&dev->ad_closesem); - } - else - { - /* There are no more references to the port */ - - dev->ad_ocount = 0; - - /* Free the IRQ and disable the ADC device */ - - flags = irqsave(); /* Disable interrupts */ - dev->ad_ops->ao_shutdown(dev); /* Disable the ADC */ - irqrestore(flags); - - sem_post(&dev->ad_closesem); - } - } - return ret; -} - -/**************************************************************************** - * Name: adc_read - ****************************************************************************/ - -static ssize_t adc_read(FAR struct file *filep, FAR char *buffer, size_t buflen) -{ - FAR struct inode *inode = filep->f_inode; - FAR struct adc_dev_s *dev = inode->i_private; - size_t nread; - irqstate_t flags; - int ret = 0; - int msglen; - - avdbg("buflen: %d\n", (int)buflen); - - if (buflen % 5 == 0) - msglen = 5; - else if (buflen % 4 == 0) - msglen = 4; - else if (buflen % 3 == 0) - msglen = 3; - else if (buflen % 2 == 0) - msglen = 2; - else if (buflen == 1) - msglen = 1; - else - msglen = 5; - - if (buflen >= msglen) - { - /* Interrupts must be disabled while accessing the ad_recv FIFO */ - - flags = irqsave(); - while (dev->ad_recv.af_head == dev->ad_recv.af_tail) - { - /* The receive FIFO is empty -- was non-blocking mode selected? */ - - if (filep->f_oflags & O_NONBLOCK) - { - ret = -EAGAIN; - goto return_with_irqdisabled; - } - - /* Wait for a message to be received */ - - dev->ad_nrxwaiters++; - ret = sem_wait(&dev->ad_recv.af_sem); - dev->ad_nrxwaiters--; - if (ret < 0) - { - ret = -errno; - goto return_with_irqdisabled; - } - } - - /* The ad_recv FIFO is not empty. Copy all buffered data that will fit - * in the user buffer. - */ - - nread = 0; - do - { - FAR struct adc_msg_s *msg = &dev->ad_recv.af_buffer[dev->ad_recv.af_head]; - - /* Will the next message in the FIFO fit into the user buffer? */ - - if (nread + msglen > buflen) - { - /* No.. break out of the loop now with nread equal to the actual - * number of bytes transferred. - */ - - break; - } - - /* Copy the message to the user buffer */ - - if (msglen == 1) - { - /* Only one channel,read highest 8-bits */ - - buffer[nread] = msg->am_data >> 24; - } - else if (msglen == 2) - { - /* Only one channel, read highest 16-bits */ - - *(int16_t *)&buffer[nread] = msg->am_data >> 16; - } - else if (msglen == 3) - { - /* Read channel highest 16-bits */ - - buffer[nread] = msg->am_channel; - *(int16_t *)&buffer[nread + 1] = msg->am_data >> 16; - } - else if (msglen == 4) - { - /* read channel highest 24-bits */ - - *(int32_t *)&buffer[nread] = msg->am_data; - buffer[nread] = msg->am_channel; - } - else - { - /* Read all */ - - *(int32_t *)&buffer[nread + 1] = msg->am_data; - buffer[nread] = msg->am_channel; - } - nread += msglen; - - /* Increment the head of the circular message buffer */ - - if (++dev->ad_recv.af_head >= CONFIG_ADC_FIFOSIZE) - { - dev->ad_recv.af_head = 0; - } - } - while (dev->ad_recv.af_head != dev->ad_recv.af_tail); - - /* All on the messages have bee transferred. Return the number of bytes - * that were read. - */ - - ret = nread; - -return_with_irqdisabled: - irqrestore(flags); - } - - avdbg("Returning: %d\n", ret); - return ret; -} - -/************************************************************************************ - * Name: adc_write - ************************************************************************************/ - -static ssize_t adc_write(FAR struct file *filep, FAR const char *buffer, size_t buflen) -{ - return 0; -} - -/************************************************************************************ - * Name: adc_ioctl - ************************************************************************************/ - -static int adc_ioctl(FAR struct file *filep, int cmd, unsigned long arg) -{ - FAR struct inode *inode = filep->f_inode; - FAR struct adc_dev_s *dev = inode->i_private; - int ret = OK; - - ret = dev->ad_ops->ao_ioctl(dev, cmd, arg); - return ret; -} - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: adc_receive - ****************************************************************************/ - -int adc_receive(FAR struct adc_dev_s *dev, uint8_t ch, int32_t data) -{ - FAR struct adc_fifo_s *fifo = &dev->ad_recv; - int nexttail; - int err = -ENOMEM; - - /* Check if adding this new message would over-run the drivers ability to enqueue - * read data. - */ - - nexttail = fifo->af_tail + 1; - if (nexttail >= CONFIG_ADC_FIFOSIZE) - { - nexttail = 0; - } - - /* Refuse the new data if the FIFO is full */ - - if (nexttail != fifo->af_head) - { - /* Add the new, decoded ADC sample at the tail of the FIFO */ - - fifo->af_buffer[fifo->af_tail].am_channel = ch; - fifo->af_buffer[fifo->af_tail].am_data = data; - - /* Increment the tail of the circular buffer */ - - fifo->af_tail = nexttail; - - if (dev->ad_nrxwaiters > 0) - { - sem_post(&fifo->af_sem); - } - - err = OK; - } - return err; -} - -/**************************************************************************** - * Name: adc_register - ****************************************************************************/ - -int adc_register(FAR const char *path, FAR struct adc_dev_s *dev) -{ - /* Initialize the ADC device structure */ - - dev->ad_ocount = 0; - - sem_init(&dev->ad_recv.af_sem, 0, 0); - sem_init(&dev->ad_closesem, 0, 1); - - dev->ad_ops->ao_reset(dev); - - return register_driver(path, &adc_fops, 0444, dev); -} |