mirror of
https://github.com/apache/nuttx.git
synced 2026-06-07 01:05:54 +08:00
Updated STM32 ADC driver
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4189 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
+186
-171
@@ -77,14 +77,14 @@ static int adc_ioctl(FAR struct file *filep,int cmd,unsigned long arg);
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static const struct file_operations adc_fops =
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{
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adc_open, /* open */
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adc_close, /* close */
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adc_read, /* read */
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adc_write, /* write */
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0, /* seek */
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adc_ioctl /* ioctl */
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adc_open, /* open */
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adc_close, /* close */
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adc_read, /* read */
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adc_write, /* write */
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0, /* seek */
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adc_ioctl /* ioctl */
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#ifndef CONFIG_DISABLE_POLL
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, 0 /* poll */
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, 0 /* poll */
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#endif
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};
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@@ -101,62 +101,62 @@ static const struct file_operations adc_fops =
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static int adc_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 adc_dev_s *dev = inode->i_private;
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uint8_t tmp;
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int ret = OK;
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FAR struct inode *inode = filep->f_inode;
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FAR struct adc_dev_s *dev = inode->i_private;
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uint8_t tmp;
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int ret = OK;
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/* If the port is the middle of closing, wait until the close is finished */
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/* If the port is the middle of closing, wait until the close is finished */
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if (sem_wait(&dev->ad_closesem) != OK)
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if (sem_wait(&dev->ad_closesem) != OK)
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{
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ret = -errno;
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ret = -errno;
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}
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else
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else
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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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/* 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 = dev->ad_ocount + 1;
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if (tmp == 0)
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tmp = dev->ad_ocount + 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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/* More than 255 opens; uint8_t overflows to zero */
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ret = -EMFILE;
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ret = -EMFILE;
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}
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else
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else
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{
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/* Check if this is the first time that the driver has been opened. */
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/* Check if this is the first time that the driver has been opened. */
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if (tmp == 1)
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if (tmp == 1)
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{
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/* Yes.. perform one time hardware initialization. */
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/* Yes.. perform one time hardware initialization. */
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irqstate_t flags = irqsave();
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ret = dev->ad_ops->ao_setup(dev);
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if (ret == OK)
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irqstate_t flags = irqsave();
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ret = dev->ad_ops->ao_setup(dev);
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if (ret == OK)
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{
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/* Mark the FIFOs empty */
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/* Mark the FIFOs empty */
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dev->ad_recv.af_head = 0;
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dev->ad_recv.af_tail = 0;
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dev->ad_recv.af_head = 0;
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dev->ad_recv.af_tail = 0;
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/* Finally, Enable the CAN RX interrupt */
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/* Finally, Enable the CAN RX interrupt */
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dev->ad_ops->ao_rxint(dev, true);
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dev->ad_ops->ao_rxint(dev, true);
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/* Save the new open count on success */
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/* Save the new open count on success */
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dev->ad_ocount = tmp;
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dev->ad_ocount = tmp;
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}
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irqrestore(flags);
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irqrestore(flags);
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}
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}
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sem_post(&dev->ad_closesem);
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sem_post(&dev->ad_closesem);
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}
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return ret;
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return ret;
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}
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/************************************************************************************
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@@ -170,43 +170,42 @@ static int adc_open(FAR struct file *filep)
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static int adc_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 adc_dev_s *dev = inode->i_private;
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irqstate_t flags;
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int ret = OK;
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FAR struct inode *inode = filep->f_inode;
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FAR struct adc_dev_s *dev = inode->i_private;
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irqstate_t flags;
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int ret = OK;
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if (sem_wait(&dev->ad_closesem) != OK)
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if (sem_wait(&dev->ad_closesem) != OK)
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{
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ret = -errno;
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ret = -errno;
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}
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else
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else
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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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/* 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 (dev->ad_ocount > 1)
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if (dev->ad_ocount > 1)
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{
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dev->ad_ocount--;
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sem_post(&dev->ad_closesem);
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dev->ad_ocount--;
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sem_post(&dev->ad_closesem);
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}
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else
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else
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{
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/* There are no more references to the port */
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/* There are no more references to the port */
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dev->ad_ocount = 0;
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dev->ad_ocount = 0;
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/* Free the IRQ and disable the ADC device */
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/* Free the IRQ and disable the ADC device */
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flags = irqsave(); /* Disable interrupts */
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dev->ad_ops->ao_shutdown(dev); /* Disable the ADC */
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irqrestore(flags);
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flags = irqsave(); /* Disable interrupts */
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dev->ad_ops->ao_shutdown(dev); /* Disable the ADC */
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irqrestore(flags);
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sem_post(&dev->ad_closesem);
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sem_post(&dev->ad_closesem);
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}
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}
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return ret;
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return ret;
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}
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/****************************************************************************
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@@ -215,115 +214,129 @@ static int adc_close(FAR struct file *filep)
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static ssize_t adc_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct adc_dev_s *dev = inode->i_private;
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size_t nread;
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irqstate_t flags;
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int ret = 0;
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int msglen;
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FAR struct inode *inode = filep->f_inode;
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FAR struct adc_dev_s *dev = inode->i_private;
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size_t nread;
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irqstate_t flags;
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int ret = 0;
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int msglen;
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if (buflen % 5 ==0 )
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msglen=5;
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else if (buflen % 4 ==0 )
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msglen=4;
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else if (buflen % 3 ==0 )
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msglen=3;
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else if (buflen % 2 ==0 )
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msglen=2;
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else if (buflen == 1)
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msglen=1;
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else
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msglen=5;
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avdbg("buflen: %d\n", (int)buflen);
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if (buflen >= msglen)
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if (buflen % 5 == 0)
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msglen = 5;
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else if (buflen % 4 == 0)
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msglen = 4;
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else if (buflen % 3 == 0)
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msglen = 3;
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else if (buflen % 2 == 0)
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msglen = 2;
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else if (buflen == 1)
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msglen = 1;
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else
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msglen = 5;
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if (buflen >= msglen)
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{
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/* Interrupts must be disabled while accessing the ad_recv FIFO */
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/* Interrupts must be disabled while accessing the ad_recv FIFO */
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flags = irqsave();
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while (dev->ad_recv.af_head == dev->ad_recv.af_tail)
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flags = irqsave();
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while (dev->ad_recv.af_head == dev->ad_recv.af_tail)
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{
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/* The receive FIFO is empty -- was non-blocking mode selected? */
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/* The receive FIFO is empty -- was non-blocking mode selected? */
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if (filep->f_oflags & O_NONBLOCK)
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if (filep->f_oflags & O_NONBLOCK)
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{
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ret = -EAGAIN;
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goto return_with_irqdisabled;
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ret = -EAGAIN;
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goto return_with_irqdisabled;
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}
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/* Wait for a message to be received */
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/* Wait for a message to be received */
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dev->ad_nrxwaiters++;
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ret = sem_wait(&dev->ad_recv.af_sem);
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dev->ad_nrxwaiters--;
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if (ret < 0)
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dev->ad_nrxwaiters++;
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ret = sem_wait(&dev->ad_recv.af_sem);
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dev->ad_nrxwaiters--;
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if (ret < 0)
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{
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ret = -errno;
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goto return_with_irqdisabled;
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ret = -errno;
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goto return_with_irqdisabled;
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}
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}
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/* The ad_recv FIFO is not empty. Copy all buffered data that will fit
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* in the user buffer.
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*/
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/* The ad_recv FIFO is not empty. Copy all buffered data that will fit
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* in the user buffer.
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*/
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nread = 0;
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do
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nread = 0;
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do
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{
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FAR struct adc_msg_s *msg = &dev->ad_recv.af_buffer[dev->ad_recv.af_head];
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FAR struct adc_msg_s *msg = &dev->ad_recv.af_buffer[dev->ad_recv.af_head];
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/* Will the next message in the FIFO fit into the user buffer? */
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/* Will the next message in the FIFO fit into the user buffer? */
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if (ret + msglen > buflen)
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if (ret + msglen > buflen)
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{
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break;
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break;
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}
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/* Copy the message to the user buffer */
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/* Copy the message to the user buffer */
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if (msglen==1)
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if (msglen == 1)
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{
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buffer[nread]=msg->am_data>>24; //Only one channel,read highest 8bits
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}
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else if (msglen==2)
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{
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*(int16_t *)&buffer[nread]=msg->am_data>>16; //Only one channel,read highest 16bits
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}
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else if (msglen==3)
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{
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buffer[nread]=msg->am_channel;
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*(int16_t *)&buffer[nread+1]=msg->am_data>>16; //read channel highest 16bits
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}
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else if (msglen==4)
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{
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*(int32_t *)&buffer[nread]=msg->am_data; //read channel highest 24bits
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buffer[nread]=msg->am_channel;
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}
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else
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{
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*(int32_t *)&buffer[nread+1]=msg->am_data; //read all
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buffer[nread]=msg->am_channel;
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}
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nread += msglen;
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/* Only one channel,read highest 8-bits */
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/* Increment the head of the circular message buffer */
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if (++dev->ad_recv.af_head >= CONFIG_ADC_FIFOSIZE)
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buffer[nread] = msg->am_data >> 24;
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}
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else if (msglen == 2)
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{
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dev->ad_recv.af_head = 0;
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/* Only one channel, read highest 16-bits */
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*(int16_t *)&buffer[nread] = msg->am_data >> 16;
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}
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else if (msglen == 3)
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{
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/* Read channel highest 16-bits */
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buffer[nread] = msg->am_channel;
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*(int16_t *)&buffer[nread + 1] = msg->am_data >> 16;
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}
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else if (msglen == 4)
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{
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/* read channel highest 24-bits */
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*(int32_t *)&buffer[nread] = msg->am_data;
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buffer[nread] = msg->am_channel;
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}
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else
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{
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/* Read all */
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*(int32_t *)&buffer[nread + 1] = msg->am_data;
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buffer[nread] = msg->am_channel;
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}
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nread += msglen;
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/* Increment the head of the circular message buffer */
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if (++dev->ad_recv.af_head >= CONFIG_ADC_FIFOSIZE)
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{
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dev->ad_recv.af_head = 0;
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}
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}
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while (dev->ad_recv.af_head != dev->ad_recv.af_tail);
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while (dev->ad_recv.af_head != dev->ad_recv.af_tail);
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/* All on the messages have bee transferred. Return the number of bytes
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* that were read.
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*/
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/* All on the messages have bee transferred. Return the number of bytes
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* that were read.
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*/
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ret = nread;
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ret = nread;
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return_with_irqdisabled:
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irqrestore(flags);
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irqrestore(flags);
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}
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return ret;
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avdbg("Returning: %d\n", ret);
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return ret;
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}
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/************************************************************************************
|
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@@ -332,7 +345,7 @@ return_with_irqdisabled:
|
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static ssize_t adc_write(FAR struct file *filep, FAR const char *buffer, size_t buflen)
|
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{
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return 0;
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return 0;
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}
|
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|
||||
/************************************************************************************
|
||||
@@ -341,12 +354,12 @@ static ssize_t adc_write(FAR struct file *filep, FAR const char *buffer, size_t
|
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|
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static int adc_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
|
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{
|
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FAR struct inode *inode = filep->f_inode;
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FAR struct adc_dev_s *dev = inode->i_private;
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int ret = OK;
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FAR struct inode *inode = filep->f_inode;
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FAR struct adc_dev_s *dev = inode->i_private;
|
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int ret = OK;
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ret = dev->ad_ops->ao_ioctl(dev, cmd, arg);
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return ret;
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ret = dev->ad_ops->ao_ioctl(dev, cmd, arg);
|
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return ret;
|
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}
|
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|
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/****************************************************************************
|
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@@ -355,51 +368,53 @@ static int adc_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
|
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|
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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;
|
||||
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.
|
||||
*/
|
||||
/* Check if adding this new message would over-run the drivers ability to enqueue
|
||||
* read data.
|
||||
*/
|
||||
|
||||
nexttail = fifo->af_tail + 1;
|
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if (nexttail >= CONFIG_ADC_FIFOSIZE)
|
||||
nexttail = fifo->af_tail + 1;
|
||||
if (nexttail >= CONFIG_ADC_FIFOSIZE)
|
||||
{
|
||||
nexttail = 0;
|
||||
nexttail = 0;
|
||||
}
|
||||
|
||||
/* Refuse the new data if the FIFO is full */
|
||||
/* Refuse the new data if the FIFO is full */
|
||||
|
||||
if (nexttail != fifo->af_head)
|
||||
if (nexttail != fifo->af_head)
|
||||
{
|
||||
/* Add the new, decoded CAN message at the tail of the FIFO */
|
||||
/* Add the new, decoded CAN message at the tail of the FIFO */
|
||||
|
||||
fifo->af_buffer[fifo->af_tail].am_channel = ch;
|
||||
fifo->af_buffer[fifo->af_tail].am_data=data;
|
||||
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 */
|
||||
/* Increment the tail of the circular buffer */
|
||||
|
||||
fifo->af_tail = nexttail;
|
||||
fifo->af_tail = nexttail;
|
||||
|
||||
if(dev->ad_nrxwaiters>0)
|
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sem_post(&fifo->af_sem);
|
||||
err = OK;
|
||||
if (dev->ad_nrxwaiters > 0)
|
||||
{
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||||
sem_post(&fifo->af_sem);
|
||||
}
|
||||
err = OK;
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
int adc_register(FAR const char *path, FAR struct adc_dev_s *dev)
|
||||
{
|
||||
/* Initialize the ADC device structure */
|
||||
/* Initialize the ADC device structure */
|
||||
|
||||
dev->ad_ocount = 0;
|
||||
dev->ad_ocount = 0;
|
||||
|
||||
sem_init(&dev->ad_recv.af_sem, 0, 0);
|
||||
sem_init(&dev->ad_closesem, 0, 1);
|
||||
sem_init(&dev->ad_recv.af_sem, 0, 0);
|
||||
sem_init(&dev->ad_closesem, 0, 1);
|
||||
|
||||
dev->ad_ops->ao_reset(dev);
|
||||
dev->ad_ops->ao_reset(dev);
|
||||
|
||||
return register_driver(path, &adc_fops, 0444, dev);
|
||||
return register_driver(path, &adc_fops, 0444, dev);
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user