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Add ADC sub-system and drivers from Lzyy

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3895 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2011-08-19 14:05:05 +00:00
parent daf0e9bd92
commit a6f7974545
6 changed files with 1006 additions and 1 deletions
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3
ChangeLog
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@ -2007,4 +2007,5 @@
* 8/18/2011: The basic port to the FreeScale Kinetics TWR-K60N512 board is * 8/18/2011: The basic port to the FreeScale Kinetics TWR-K60N512 board is
now functional. now functional.
* confgs/twr-k60n512: Add Kinetics TWR-K60N512 NSH configuration. * confgs/twr-k60n512: Add Kinetics TWR-K60N512 NSH configuration.
* drivers/analog and include/nuttx/analog: Add ADC driver infrastructure
and TI ADS1255 driver developed and submitted by Li Zhouy (Lzzy)).

1
drivers/Makefile
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@ -48,6 +48,7 @@ VPATH = .
# files to the source file list, add its DEPPATH info, and will add # files to the source file list, add its DEPPATH info, and will add
# the appropriate paths to the VPATH variable # the appropriate paths to the VPATH variable
include analog/Make.defs
include bch/Make.defs include bch/Make.defs
include input/Make.defs include input/Make.defs
include lcd/Make.defs include lcd/Make.defs

76
drivers/analog/Make.defs Executable file
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@ -0,0 +1,76 @@
############################################################################
# drivers/analog/Make.defs
#
# Copyright (C) 2011 Gregory Nutt. All rights reserved.
# Author: Gregory Nutt <spudmonkey@racsa.co.cr>
#
# 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.
#
############################################################################
# Don't build anything if there is no support for analog devices
# Check for DAC devices
ifeq ($(CONFIG_DAC),y)
# Include the common ADC character driver
# Include DAC device drivers
endif
# Check for ADC devices
ifeq ($(CONFIG_ADC),y)
# Include the common ADC character driver
CSRCS += adc.c
# Include ADC device drivers
ifeq ($(CONFIG_ADC_ADS125X),y)
CSRCS += ads1255.c
endif
endif
# Add analog driver build support (the nested if-then-else implements an OR)
ifeq ($(CONFIG_DAC),y)
DEPPATH += --dep-path analog
VPATH += :analog
CFLAGS += ${shell $(TOPDIR)/tools/incdir.sh $(INCDIROPT) "$(CC)" $(TOPDIR)/drivers/analog}
else
ifeq ($(CONFIG_ADC),y)
DEPPATH += --dep-path analog
VPATH += :analog
CFLAGS += ${shell $(TOPDIR)/tools/incdir.sh $(INCDIROPT) "$(CC)" $(TOPDIR)/drivers/analog}
endif
endif

405
drivers/analog/adc.c Normal file
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@ -0,0 +1,405 @@
/****************************************************************************
* drivers/adc/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 <spudmonkey@racsa.co.cr>
*
* 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.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->cd_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->cd_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->cd_ops->ao_setup(dev);
if (ret == OK)
{
/* Mark the FIFOs empty */
dev->cd_recv.af_head = 0;
dev->cd_recv.af_tail = 0;
/* Finally, Enable the CAN RX interrupt */
dev->cd_ops->ao_rxint(dev, true);
/* Save the new open count on success */
dev->cd_ocount = tmp;
}
irqrestore(flags);
}
}
sem_post(&dev->cd_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->cd_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->cd_ocount > 1)
{
dev->cd_ocount--;
sem_post(&dev->cd_closesem);
}
else
{
/* There are no more references to the port */
dev->cd_ocount = 0;
/* Free the IRQ and disable the ADC device */
flags = irqsave(); /* Disable interrupts */
dev->cd_ops->ao_shutdown(dev); /* Disable the ADC */
irqrestore(flags);
sem_post(&dev->cd_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;
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 cd_recv FIFO */
flags = irqsave();
while (dev->cd_recv.af_head == dev->cd_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->cd_nrxwaiters++;
ret = sem_wait(&dev->cd_recv.af_sem);
dev->cd_nrxwaiters--;
if (ret < 0)
{
ret = -errno;
goto return_with_irqdisabled;
}
}
/* The cd_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->cd_recv.af_buffer[dev->cd_recv.af_head];
/* Will the next message in the FIFO fit into the user buffer? */
if (ret + msglen > buflen)
{
break;
}
/* Copy the message to the user buffer */
if (msglen==1)
{
buffer[nread]=msg->am_data>>24; //Only one channel,read highest 8bits
}
else if (msglen==2)
{
*(int16_t *)&buffer[nread]=msg->am_data>>16; //Only one channel,read highest 16bits
}
else if (msglen==3)
{
buffer[nread]=msg->am_channel;
*(int16_t *)&buffer[nread+1]=msg->am_data>>16; //read channel highest 16bits
}
else if (msglen==4)
{
*(int32_t *)&buffer[nread]=msg->am_data; //read channel highest 24bits
buffer[nread]=msg->am_channel;
}
else
{
*(int32_t *)&buffer[nread+1]=msg->am_data; //read all
buffer[nread]=msg->am_channel;
}
nread += msglen;
/* Increment the head of the circular message buffer */
if (++dev->cd_recv.af_head >= CONFIG_ADC_FIFOSIZE)
{
dev->cd_recv.af_head = 0;
}
}
while (dev->cd_recv.af_head != dev->cd_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);
}
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->cd_ops->ao_ioctl(dev, cmd, arg);
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
int adc_receive(FAR struct adc_dev_s *dev, uint8_t ch, int32_t data)
{
FAR struct adc_fifo_s *fifo = &dev->cd_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 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;
/* Increment the tail of the circular buffer */
fifo->af_tail = nexttail;
if( dev->cd_nrxwaiters>0)
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 */
dev->cd_ocount = 0;
sem_init(&dev->cd_recv.af_sem, 0, 0);
sem_init(&dev->cd_closesem, 0, 1);
dev->cd_ops->ao_reset(dev);
return register_driver(path, &adc_fops, 0444, dev);
}

334
drivers/analog/ads1255.c Normal file
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@ -0,0 +1,334 @@
/************************************************************************************
* arch/drivers/adc/ads1255.c
*
* Copyright (C) 2011 Li Zhuoyi. All rights reserved.
* Author: Li Zhuoyi <lzyy.cn@gmail.com>
* History: 0.1 2011-08-05 initial version
*
* This file is a part of NuttX:
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
*
* 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.
*
************************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <semaphore.h>
#include <errno.h>
#include <debug.h>
#include <arch/board/board.h>
#include <nuttx/arch.h>
#include <nuttx/spi.h>
#include <nuttx/analog/adc.h>
#if defined(CONFIG_ADC_ADS1255)
#define ADS125X_BUFON 0x02
#define ADS125X_BUFOFF 0x00
#define ADS125X_PGA1 0x00
#define ADS125X_PGA2 0x01
#define ADS125X_PGA4 0x02
#define ADS125X_PGA8 0x03
#define ADS125X_PGA16 0x04
#define ADS125X_PGA32 0x05
#define ADS125X_PGA64 0x06
#define ADS125X_RDATA 0x01 //Read Data
#define ADS125X_RDATAC 0x03 //Read Data Continuously
#define ADS125X_SDATAC 0x0F //Stop Read Data Continuously
#define ADS125X_RREG 0x10 //Read from REG
#define ADS125X_WREG 0x50 //Write to REG
#define ADS125X_SELFCAL 0xF0 //Offset and Gain Self-Calibration
#define ADS125X_SELFOCAL 0xF1 //Offset Self-Calibration
#define ADS125X_SELFGCAL 0xF2 //Gain Self-Calibration
#define ADS125X_SYSOCAL 0xF3 //System Offset Calibration
#define ADS125X_SYSGCAL 0xF4 //System Gain Calibration
#define ADS125X_SYNC 0xFC //Synchronize the A/D Conversion
#define ADS125X_STANDBY 0xFD //Begin Standby Mode
#define ADS125X_RESET 0xFE //Reset to Power-Up Values
#define ADS125X_WAKEUP 0xFF //Completes SYNC and Exits Standby Mode
#ifndef CONFIG_ADS1255_FREQUENCY
#define CONFIG_ADS1255_FREQUENCY 1000000
#endif
#ifndef CONFIG_ADS1255_MUX
#define CONFIG_ADS1255_MUX 0x01
#endif
#ifndef CONFIG_ADS1255_CHMODE
#define CONFIG_ADS1255_CHMODE 0x00
#endif
#ifndef CONFIG_ADS1255_BUFON
#define CONFIG_ADS1255_BUFON 1
#endif
#ifndef CONFIG_ADS1255_PGA
#define CONFIG_ADS1255_PGA ADS125X_PGA2
#endif
#ifndef CONFIG_ADS1255_SPS
#define CONFIG_ADS1255_SPS 50
#endif
/****************************************************************************
* cd_private Types
****************************************************************************/
struct up_dev_s
{
uint8_t channel;
uint8_t sps;
uint8_t pga;
uint8_t buf;
const uint8_t *mux;
int irq;
int devno;
FAR struct spi_dev_s *spi; /* Cached SPI device reference */
};
/****************************************************************************
* cd_private Function Prototypes
****************************************************************************/
/* ADC methods */
static void adc_reset(FAR struct adc_dev_s *dev);
static int adc_setup(FAR struct adc_dev_s *dev);
static void adc_shutdown(FAR struct adc_dev_s *dev);
static void adc_rxint(FAR struct adc_dev_s *dev, bool enable);
static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg);
static int adc_interrupt(int irq, void *context);
/****************************************************************************
* cd_private Data
****************************************************************************/
static const struct adc_ops_s g_adcops =
{
adc_reset, /* ao_reset */
adc_setup, /* ao_setup */
adc_shutdown, /* ao_shutdown */
adc_rxint, /* ao_rxint */
adc_ioctl /* ao_read */
};
static struct up_dev_s g_adcpriv =
{
.mux = (const uint8_t [])
{
CONFIG_ADS1255_MUX,0
},
.sps = CONFIG_ADS1255_SPS,
.channel = 0,
.irq = CONFIG_ADS1255_IRQ,
};
static struct adc_dev_s g_adcdev =
{
.cd_ops = &g_adcops,
.cd_priv= &g_adcpriv,
};
/****************************************************************************
* Private Functions
****************************************************************************/
static uint8_t getspsreg(uint16_t sps)
{
static const unsigned short sps_tab[]=
{
3,7,12,20,27,40,55,80,300,750,1500,3000,5000,10000,20000,65535,
};
static const unsigned char sps_reg[]=
{
0x03,0x13,0x23,0x33,0x43,0x53,0x63,0x72,0x82,0x92,0xa1,0xb0,0xc0,0xd0,0xe0,0xf0,
};
int i;
for (i=0; i<16; i++)
{
if (sps<sps_tab[i])
break;
}
return sps_reg[i];
}
/****************************************************************************
* cd_private Functions
****************************************************************************/
/* Reset the ADC device. Called early to initialize the hardware. This
* is called, before ao_setup() and on error conditions.
*/
static void adc_reset(FAR struct adc_dev_s *dev)
{
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->cd_priv;
FAR struct spi_dev_s *spi = priv->spi;
SPI_SETMODE(spi, SPIDEV_MODE1);
SPI_SETBITS(spi, 8);
SPI_SETFREQUENCY(spi, CONFIG_ADS1255_FREQUENCY);
usleep(1000);
SPI_SELECT(spi, priv->devno, true);
SPI_SEND(spi,ADS125X_WREG+0x03); //WRITE SPS REG
SPI_SEND(spi,0x00); //count=1
SPI_SEND(spi,0x63);
SPI_SELECT(spi, priv->devno, false);
}
/* Configure the ADC. This method is called the first time that the ADC
* device is opened. This will occur when the port is first opened.
* This setup includes configuring and attaching ADC interrupts. Interrupts
* are all disabled upon return.
*/
static int adc_setup(FAR struct adc_dev_s *dev)
{
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->cd_priv;
FAR struct spi_dev_s *spi = priv->spi;
int ret = irq_attach(priv->irq, adc_interrupt);
if (ret == OK)
{
SPI_SELECT(spi, priv->devno, true);
SPI_SEND(spi,ADS125X_WREG); //WRITE REG from 0
SPI_SEND(spi,0x03); //count=4+1
if (priv->buf)
SPI_SEND(spi,ADS125X_BUFON); //REG0 STATUS BUFFER ON
else
SPI_SEND(spi,ADS125X_BUFOFF);
SPI_SEND(spi,priv->mux[0]);
SPI_SEND(spi,priv->pga); //REG2 ADCON PGA=2
SPI_SEND(spi,getspsreg(priv->sps));
usleep(1000);
SPI_SEND(spi,ADS125X_SELFCAL);
SPI_SELECT(spi, priv->devno, false);
up_enable_irq(priv->irq);
}
return ret;
}
/* Disable the ADC. This method is called when the ADC device is closed.
* This method reverses the operation the setup method.
*/
static void adc_shutdown(FAR struct adc_dev_s *dev)
{
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->cd_priv;
up_disable_irq(priv->irq);
irq_detach(priv->irq);
}
/* Call to enable or disable RX interrupts */
static void adc_rxint(FAR struct adc_dev_s *dev, bool enable)
{
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->cd_priv;
if (enable)
up_enable_irq(priv->irq);
else
up_disable_irq(priv->irq);
}
/* All ioctl calls will be routed through this method */
static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg)
{
dbg("Fix me:Not Implemented\n");
return 0;
}
static int adc_interrupt(int irq, void *context)
{
uint32_t regval;
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)g_adcdev.cd_priv;
FAR struct spi_dev_s *spi = priv->spi;
unsigned char buf[4];
unsigned char ch;
SPI_SELECT(spi, priv->devno, true);
SPI_SEND(spi,ADS125X_RDATA);
up_udelay(10);
buf[3]=SPI_SEND(spi,0xff);
buf[2]=SPI_SEND(spi,0xff);
buf[1]=SPI_SEND(spi,0xff);
buf[0]=0;
priv->channel++;
ch = priv->mux[priv->channel];
if ( ch == 0 )
{
priv->channel=0;
ch = priv->mux[0];
}
SPI_SEND(spi,ADS125X_WREG+0x01);
SPI_SEND(spi,0x00);
SPI_SEND(spi,ch);
SPI_SEND(spi,ADS125X_SYNC);
up_udelay(2);
SPI_SEND(spi,ADS125X_WAKEUP);
SPI_SELECT(spi, priv->devno, false);
adc_receive(&g_adcdev,priv->channel,*(int32_t *)buf);
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_ads1255initialize
*
* Description:
* Initialize the selected adc port
*
* Input Parameter:
* Port number (for hardware that has mutiple adc interfaces)
*
* Returned Value:
* Valid can device structure reference on succcess; a NULL on failure
*
****************************************************************************/
FAR struct adc_dev_s *up_ads1255initialize(FAR struct spi_dev_s *spi, unsigned int devno)
{
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)g_adcdev.cd_priv;
/* Driver state data */
priv->spi = spi;
priv->devno = devno;
return &g_adcdev;
}
#endif

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/************************************************************************************
* include/nuttx/analog/adc.h
*
* 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 include/nuttx/can.h
* Copyright (C) 2008, 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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.
*
************************************************************************************/
#ifndef __INCLUDE_NUTTX_ANALOG_ADC_H
#define __INCLUDE_NUTTX_ANALOG_ADC_H
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <semaphore.h>
#include <nuttx/fs.h>
#include <nuttx/spi.h>
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
/* Default configuration settings that may be overridden in the board configuration.
* file. The configured size is limited to 255 to fit into a uint8_t.
*/
#if !defined(CONFIG_ADC_FIFOSIZE)
# define CONFIG_ADC_FIFOSIZE 8
#elif CONFIG_ADC_FIFOSIZE > 255
# undef CONFIG_ADC_FIFOSIZE
# define CONFIG_ADC_FIFOSIZE 255
#endif
/************************************************************************************
* Public Types
************************************************************************************/
struct adc_msg_s
{
uint8_t am_channel; /* The 8-bit ADC Channel */
int32_t am_data; /* ADC convert result (4 bytes) */
}__attribute__((__packed__));
struct adc_fifo_s
{
sem_t af_sem; /* Counting semaphore */
uint8_t af_head; /* Index to the head [IN] index in the circular buffer */
uint8_t af_tail; /* Index to the tail [OUT] index in the circular buffer */
/* Circular buffer of CAN messages */
struct adc_msg_s af_buffer[CONFIG_ADC_FIFOSIZE];
};
/* This structure defines all of the operations providd by the architecture specific
* logic. All fields must be provided with non-NULL function pointers by the
* caller of can_register().
*/
struct adc_dev_s;
struct adc_ops_s
{
/* Reset the ADC device. Called early to initialize the hardware. This
* is called, before ao_setup() and on error conditions.
*/
CODE void (*ao_reset)(FAR struct adc_dev_s *dev);
/* Configure the ADC. This method is called the first time that the ADC
* device is opened. This will occur when the port is first opened.
* This setup includes configuring and attaching ADC interrupts. Interrupts
* are all disabled upon return.
*/
CODE int (*ao_setup)(FAR struct adc_dev_s *dev);
/* Disable the ADC. This method is called when the ADC device is closed.
* This method reverses the operation the setup method.
*/
CODE void (*ao_shutdown)(FAR struct adc_dev_s *dev);
/* Call to enable or disable RX interrupts */
CODE void (*ao_rxint)(FAR struct adc_dev_s *dev, bool enable);
CODE int (*ao_read)(FAR struct adc_dev_s *dev, char *buffer,int len);
/* All ioctl calls will be routed through this method */
CODE int (*ao_ioctl)(FAR struct adc_dev_s *dev, int cmd, unsigned long arg);
};
/* This is the device structure used by the driver. The caller of
* can_register() must allocate and initialize this structure. The
* calling logic need only set all fields to zero except:
*
* The elements of 'cd_ops', and 'cd_priv'
*
* The common logic will initialize all semaphores.
*/
struct adc_dev_s
{
uint8_t cd_ocount; /* The number of times the device has been opened */
uint8_t cd_nrxwaiters; /* Number of threads waiting to enqueue a message */
sem_t cd_closesem; /* Locks out new opens while close is in progress */
sem_t cd_recvsem; /* Used to wakeup user waiting for space in cd_recv.buffer */
struct adc_fifo_s cd_recv; /* Describes receive FIFO */
const struct adc_ops_s *cd_ops; /* Arch-specific operations */
void *cd_priv; /* Used by the arch-specific logic */
};
/************************************************************************************
* Public Data
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
#if defined(__cplusplus)
extern "C" {
#endif
/************************************************************************************
* Name: adc_register
*
* Description:
* Register a adc driver.
*
************************************************************************************/
int adc_register(FAR const char *path, FAR struct adc_dev_s *dev);
int adc_receive(FAR struct adc_dev_s *dev, uint8_t ch, int32_t data);
/************************************************************************************
* Name: up_ads1255initialize
*
* Description:
* Initialize the TI ADS 125X lower half driver
*
************************************************************************************/
FAR struct adc_dev_s *up_ads1255initialize(FAR struct spi_dev_s *spi, unsigned int devno);
#if defined(__cplusplus)
}
#endif
#endif /* __INCLUDE_NUTTX_ANALOG_ADC_H */