350 lines
10 KiB
C
350 lines
10 KiB
C
/************************************************************************************
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* arch/drivers/analog/ads1255.c
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*
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* Copyright (C) 2011 Li Zhuoyi. All rights reserved.
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* Author: Li Zhuoyi <lzyy.cn@gmail.com>
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* History: 0.1 2011-08-05 initial version
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* 0.2 2011-08-25 fix bug in g_adcdev (cd_ops -> ad_ops,cd_priv -> ad_priv)
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*
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* This file is a part of NuttX:
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*
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* Copyright (C) 2010 Gregory Nutt. All rights reserved.
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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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#include <nuttx/config.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <semaphore.h>
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#include <errno.h>
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#include <debug.h>
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#include <arch/board/board.h>
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#include <nuttx/arch.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/analog/adc.h>
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#if defined(CONFIG_ADC_ADS1255)
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#define ADS125X_BUFON 0x02
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#define ADS125X_BUFOFF 0x00
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#define ADS125X_PGA1 0x00
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#define ADS125X_PGA2 0x01
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#define ADS125X_PGA4 0x02
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#define ADS125X_PGA8 0x03
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#define ADS125X_PGA16 0x04
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#define ADS125X_PGA32 0x05
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#define ADS125X_PGA64 0x06
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#define ADS125X_RDATA 0x01 //Read Data
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#define ADS125X_RDATAC 0x03 //Read Data Continuously
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#define ADS125X_SDATAC 0x0F //Stop Read Data Continuously
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#define ADS125X_RREG 0x10 //Read from REG
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#define ADS125X_WREG 0x50 //Write to REG
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#define ADS125X_SELFCAL 0xF0 //Offset and Gain Self-Calibration
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#define ADS125X_SELFOCAL 0xF1 //Offset Self-Calibration
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#define ADS125X_SELFGCAL 0xF2 //Gain Self-Calibration
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#define ADS125X_SYSOCAL 0xF3 //System Offset Calibration
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#define ADS125X_SYSGCAL 0xF4 //System Gain Calibration
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#define ADS125X_SYNC 0xFC //Synchronize the A/D Conversion
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#define ADS125X_STANDBY 0xFD //Begin Standby Mode
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#define ADS125X_RESET 0xFE //Reset to Power-Up Values
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#define ADS125X_WAKEUP 0xFF //Completes SYNC and Exits Standby Mode
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#ifndef CONFIG_ADS1255_FREQUENCY
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#define CONFIG_ADS1255_FREQUENCY 1000000
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#endif
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#ifndef CONFIG_ADS1255_MUX
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#define CONFIG_ADS1255_MUX 0x01
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#endif
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#ifndef CONFIG_ADS1255_CHMODE
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#define CONFIG_ADS1255_CHMODE 0x00
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#endif
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#ifndef CONFIG_ADS1255_BUFON
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#define CONFIG_ADS1255_BUFON 1
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#endif
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#ifndef CONFIG_ADS1255_PGA
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#define CONFIG_ADS1255_PGA ADS125X_PGA2
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#endif
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#ifndef CONFIG_ADS1255_SPS
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#define CONFIG_ADS1255_SPS 50
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#endif
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/****************************************************************************
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* ad_private Types
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****************************************************************************/
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struct up_dev_s
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{
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uint8_t channel;
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uint32_t sps;
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uint8_t pga;
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uint8_t buf;
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const uint8_t *mux;
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int irq;
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int devno;
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FAR struct spi_dev_s *spi; /* Cached SPI device reference */
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};
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/****************************************************************************
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* ad_private Function Prototypes
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****************************************************************************/
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/* ADC methods */
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static void adc_reset(FAR struct adc_dev_s *dev);
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static int adc_setup(FAR struct adc_dev_s *dev);
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static void adc_shutdown(FAR struct adc_dev_s *dev);
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static void adc_rxint(FAR struct adc_dev_s *dev, bool enable);
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static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg);
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static int adc_interrupt(int irq, void *context);
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/****************************************************************************
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* ad_private Data
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****************************************************************************/
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static const struct adc_ops_s g_adcops =
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{
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.ao_reset = adc_reset, /* ao_reset */
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.ao_setup = adc_setup, /* ao_setup */
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.ao_shutdown = adc_shutdown, /* ao_shutdown */
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.ao_rxint = adc_rxint, /* ao_rxint */
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.ao_ioctl = adc_ioctl /* ao_read */
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};
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static struct up_dev_s g_adcpriv =
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{
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.mux = (const uint8_t [])
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{
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CONFIG_ADS1255_MUX,0
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},
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.sps = CONFIG_ADS1255_SPS,
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.channel = 0,
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.irq = CONFIG_ADS1255_IRQ,
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};
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static struct adc_dev_s g_adcdev =
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{
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.ad_ops = &g_adcops,
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.ad_priv= &g_adcpriv,
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static uint8_t getspsreg(uint16_t sps)
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{
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static const unsigned short sps_tab[]=
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{
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3,7,12,20,27,40,55,80,300,750,1500,3000,5000,10000,20000,65535,
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};
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static const unsigned char sps_reg[]=
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{
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0x03,0x13,0x23,0x33,0x43,0x53,0x63,0x72,0x82,0x92,0xa1,0xb0,0xc0,0xd0,0xe0,0xf0,
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};
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int i;
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for (i=0; i<16; i++)
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{
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if (sps<sps_tab[i])
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{
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break;
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}
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}
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return sps_reg[i];
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}
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/****************************************************************************
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* ad_private Functions
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****************************************************************************/
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/* Reset the ADC device. Called early to initialize the hardware. This
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* is called, before ao_setup() and on error conditions.
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*/
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static void adc_reset(FAR struct adc_dev_s *dev)
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{
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FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->ad_priv;
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FAR struct spi_dev_s *spi = priv->spi;
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SPI_SETMODE(spi, SPIDEV_MODE1);
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SPI_SETBITS(spi, 8);
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SPI_SETFREQUENCY(spi, CONFIG_ADS1255_FREQUENCY);
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usleep(1000);
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SPI_SELECT(spi, priv->devno, true);
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SPI_SEND(spi,ADS125X_WREG+0x03); /* WRITE SPS REG */
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SPI_SEND(spi,0x00); /* count=1 */
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SPI_SEND(spi,0x63);
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SPI_SELECT(spi, priv->devno, false);
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}
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/* Configure the ADC. This method is called the first time that the ADC
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* device is opened. This will occur when the port is first opened.
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* This setup includes configuring and attaching ADC interrupts. Interrupts
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* are all disabled upon return.
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*/
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static int adc_setup(FAR struct adc_dev_s *dev)
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{
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FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->ad_priv;
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FAR struct spi_dev_s *spi = priv->spi;
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int ret = irq_attach(priv->irq, adc_interrupt);
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if (ret == OK)
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{
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SPI_SELECT(spi, priv->devno, true);
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SPI_SEND(spi,ADS125X_WREG); /* WRITE REG from 0 */
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SPI_SEND(spi,0x03); /* count=4+1 */
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if (priv->buf)
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{
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SPI_SEND(spi,ADS125X_BUFON); /* REG0 STATUS BUFFER ON */
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}
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else
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{
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SPI_SEND(spi,ADS125X_BUFOFF);
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}
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SPI_SEND(spi,priv->mux[0]);
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SPI_SEND(spi,priv->pga); /* REG2 ADCON PGA=2 */
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SPI_SEND(spi,getspsreg(priv->sps));
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usleep(1000);
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SPI_SEND(spi,ADS125X_SELFCAL);
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SPI_SELECT(spi, priv->devno, false);
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up_enable_irq(priv->irq);
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}
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return ret;
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}
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/* Disable the ADC. This method is called when the ADC device is closed.
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* This method reverses the operation the setup method.
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*/
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static void adc_shutdown(FAR struct adc_dev_s *dev)
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{
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FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->ad_priv;
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up_disable_irq(priv->irq);
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irq_detach(priv->irq);
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}
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/* Call to enable or disable RX interrupts */
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static void adc_rxint(FAR struct adc_dev_s *dev, bool enable)
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{
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FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->ad_priv;
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if (enable)
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{
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up_enable_irq(priv->irq);
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}
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else
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{
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up_disable_irq(priv->irq);
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}
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}
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/* All ioctl calls will be routed through this method */
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static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg)
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{
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dbg("Fix me:Not Implemented\n");
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return 0;
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}
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static int adc_interrupt(int irq, void *context)
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{
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FAR struct up_dev_s *priv = (FAR struct up_dev_s *)g_adcdev.ad_priv;
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FAR struct spi_dev_s *spi = priv->spi;
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unsigned char buf[4];
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unsigned char ch;
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SPI_SELECT(spi, priv->devno, true);
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SPI_SEND(spi,ADS125X_RDATA);
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up_udelay(10);
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buf[3]=SPI_SEND(spi,0xff);
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buf[2]=SPI_SEND(spi,0xff);
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buf[1]=SPI_SEND(spi,0xff);
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buf[0]=0;
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priv->channel++;
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ch = priv->mux[priv->channel];
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if ( ch == 0 )
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{
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priv->channel=0;
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ch = priv->mux[0];
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}
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SPI_SEND(spi,ADS125X_WREG+0x01);
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SPI_SEND(spi,0x00);
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SPI_SEND(spi,ch);
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SPI_SEND(spi,ADS125X_SYNC);
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up_udelay(2);
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SPI_SEND(spi,ADS125X_WAKEUP);
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SPI_SELECT(spi, priv->devno, false);
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adc_receive(&g_adcdev,priv->channel,*(int32_t *)buf);
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return OK;
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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: up_ads1255initialize
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*
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* Description:
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* Initialize the selected adc port
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*
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* Input Parameter:
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* Port number (for hardware that has mutiple adc interfaces)
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*
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* Returned Value:
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* Valid can device structure reference on succcess; a NULL on failure
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*
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****************************************************************************/
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FAR struct adc_dev_s *up_ads1255initialize(FAR struct spi_dev_s *spi, unsigned int devno)
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{
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FAR struct up_dev_s *priv = (FAR struct up_dev_s *)g_adcdev.ad_priv;
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/* Driver state data */
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priv->spi = spi;
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priv->devno = devno;
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return &g_adcdev;
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}
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#endif
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