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Diffstat (limited to 'nuttx/drivers/analog/ads1255.c')
| -rw-r--r-- | nuttx/drivers/analog/ads1255.c | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/nuttx/drivers/analog/ads1255.c b/nuttx/drivers/analog/ads1255.c new file mode 100644 index 000000000..adc053a93 --- /dev/null +++ b/nuttx/drivers/analog/ads1255.c @@ -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 + |