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author | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2012-07-25 18:41:10 +0000 |
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committer | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2012-07-25 18:41:10 +0000 |
commit | cf48e3c73f884d28b715db676a6777c32af702dc (patch) | |
tree | e1361e761b01704d1ad41b9f89c9501a42610b4a /nuttx/include | |
parent | ca8620083e4f2c28d7b65d97880a42d1d68d1700 (diff) | |
download | px4-firmware-cf48e3c73f884d28b715db676a6777c32af702dc.tar.gz px4-firmware-cf48e3c73f884d28b715db676a6777c32af702dc.tar.bz2 px4-firmware-cf48e3c73f884d28b715db676a6777c32af702dc.zip |
Add support for the TI PGA11x amplifier/multiplexer
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4977 7fd9a85b-ad96-42d3-883c-3090e2eb8679
Diffstat (limited to 'nuttx/include')
-rw-r--r-- | nuttx/include/nuttx/input/pga11x.h | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/nuttx/include/nuttx/input/pga11x.h b/nuttx/include/nuttx/input/pga11x.h new file mode 100644 index 000000000..f60d7830d --- /dev/null +++ b/nuttx/include/nuttx/input/pga11x.h @@ -0,0 +1,292 @@ +/**************************************************************************** + * include/nuttx/input/pga11x.h + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Authors: Gregory Nutt <gnutt@nuttx.org> + * + * References: + * "PGA112, PGA113, PGA116, PGA117: Zerø-Drift PROGRAMMABLE GAIN AMPLIFIER + * with MUX", SBOS424B, March 2008, Revised September 2008, Texas + * Instruments Incorporated" + * + * 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_INPUT_PGA11X_H +#define __INCLUDE_NUTTX_INPUT_PGA11X_H + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#include <nuttx/spi.h> + +#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_PGA11X) + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ +/* Configuration ************************************************************/ +/* Prerequisites: CONFIG_INPUT=y + * + * CONFIG_INPUT_PGA11X + * Enables support for the PGA11X driver (Needs CONFIG_INPUT) + * CONFIG_PGA11X_SPIFREQUENCY + * SPI frequency. Default 1MHz + * CONFIG_PGA11X_DAISYCHAIN + * Use two PGA116/7's in Daisy Chain commands. + * CONFIG_PGA11X_SPIMODE + * SPI Mode. The specification says that the device operates in Mode 0 or + * Mode 3. But sometimes you need to tinker with this to get things to + * work correctly. Default: Mode 0 + * CONFIG_PGA11X_MULTIPLE + * Can be defined to support multiple PGA11X devices on board. Each + * device will require a customized SPI interface to distinguish them + * When SPI_SELECT is called with devid=SPIDEV_MUX. + * + * Other settings that effect the driver: CONFIG_SPI_OWNBUS, CONFIG_DEBUG_SPI. + */ + +#ifndef CONFIG_PGA11X_SPIFREQUENCY +# define CONFIG_PGA11X_SPIFREQUENCY 1000000 +#endif + +#ifndef CONFIG_PGA11X_SPIMODE +# define CONFIG_PGA11X_SPIMODE SPIDEV_MODE0 +#endif + +/* PGA11x Commands **********************************************************/ +/* Write command Gain Selection Bits (PGA112/PGA113) + * + * the PGA112 and PGA116 provide binary gain selections (1, 2, 4, 8, 16, 32, + * 64, 128); the PGA113 and PGA117 provide scope gain selections (1, 2, 5, 10, + * 20, 50, 100, 200). + */ + +#define PGA11X_GAIN_1 (0) /* Gain=1: Scope Gain=1 */ +#define PGA11X_GAIN_2 (1) /* Gain=2: Scope Gain=2 */ +#define PGA11X_GAIN_4 (2) /* Gain=4: Scope Gain=5 */ +#define PGA11X_GAIN_5 (2) /* Gain=4: Scope Gain=5 */ +#define PGA11X_GAIN_8 (3) /* Gain=8: Scope Gain=10 */ +#define PGA11X_GAIN_10 (3) /* Gain=8: Scope Gain=10 */ +#define PGA11X_GAIN_16 (4) /* Gain=16: Scope Gain=20 */ +#define PGA11X_GAIN_20 (4) /* Gain=16: Scope Gain=20 */ +#define PGA11X_GAIN_32 (5) /* Gain=32: Scope Gain=50 */ +#define PGA11X_GAIN_50 (5) /* Gain=32: Scope Gain=50 */ +#define PGA11X_GAIN_64 (6) /* Gain=64: Scope Gain=100 */ +#define PGA11X_GAIN_100 (6) /* Gain=64: Scope Gain=100 */ +#define PGA11X_GAIN_128 (7) /* Gain=128: Scope Gain=200 */ +#define PGA11X_GAIN_200 (7) /* Gain=128: Scope Gain=200 */ + +/* Write command Mux Channel Selection Bits + * + * The PGA112/PGA113 have a two-channel input MUX; the PGA116/PGA117 have a + * 10-channel input MUX. + */ + +#define PGA11X_CHAN_VCAL (0) /* VCAL/CH0 */ +#define PGA11X_CHAN_CH0 (0) /* VCAL/CH0 */ +#define PGA11X_CHAN_CH1 (1) /* CH1 */ +#define PGA11X_CHAN_CH2 (2) /* CH2 (PGA116/PGA117 only) */ +#define PGA11X_CHAN_CH3 (3) /* CH3 (PGA116/PGA117 only) */ +#define PGA11X_CHAN_CH4 (4) /* CH4 (PGA116/PGA117 only) */ +#define PGA11X_CHAN_CH5 (5) /* CH5 (PGA116/PGA117 only) */ +#define PGA11X_CHAN_CH6 (6) /* CH6 (PGA116/PGA117 only) */ +#define PGA11X_CHAN_CH7 (7) /* CH7 (PGA116/PGA117 only) */ +#define PGA11X_CHAN_CH8 (8) /* CH8 (PGA116/PGA117 only) */ +#define PGA11X_CHAN_CH9 (9) /* CH9 (PGA116/PGA117 only) */ +#define PGA11X_CHAN_CAL1 (12) /* CAL1: connects to GND */ +#define PGA11X_CHAN_CAL2 (13) /* CAL2: connects to 0.9VCAL */ +#define PGA11X_CHAN_CAL3 (14) /* CAL3: connects to 0.1VCAL */ +#define PGA11X_CHAN_CAL4 (15) /* CAL4: connects to VREF */ + +/* These macros may be used to decode the value returned by pga11x_read() */ + + +#define PGA11X_GAIN_SHIFT (4) /* B*/ +#define PGA11X_GAIN_MASK (15 << PGA11X_GAIN_SHIFT) + +/* Write command Mux Channel Selection Bits + * + * The PGA112/PGA113 have a two-channel input MUX; the PGA116/PGA117 have a + * 10-channel input MUX. + */ + +#ifndef CONFIG_PGA11X_DAISYCHAIN +/* Bits 0-3: Channel Selection Bits + * Bits 4-7: Gain Selection Bits + */ + +# define PGA11X_CHAN(value) ((uint16_t)value & 0x000f) +# define PGA11X_GAIN(value) (((uint16_t)value >> 4) & 0x000f) + +#else +/* Bits 0-3: U1 Channel Selection Bits + * Bits 4-7: U1 Gain Selection Bits + * Bits 16-19: U2 Channel Selection Bits + * Bits 20-23: U2 Gain Selection Bits + */ + +# define PGA11X_U1_CHAN(value) ((uint32_t)value & 0x0000000f) +# define PGA11X_U1_GAIN(value) (((uint32_t)value >> 4) & 0x0000000f) +# define PGA11X_U2_CHAN(value) (((uint32_t)value >> 16) & 0x0000000f) +# define PGA11X_U2_GAIN(value) (((uint32_t)value >> 20) & 0x0000000f) +#endif + +/**************************************************************************** + * Public Types + ****************************************************************************/ + +/* Handle used to reference the particular PGA11X instance */ + +typedef FAR void *PGA11X_HANDLE; + +/**************************************************************************** + * Public Function Prototypes + ****************************************************************************/ + +#ifdef __cplusplus +#define EXTERN extern "C" +extern "C" { +#else +#define EXTERN extern +#endif + +/**************************************************************************** + * Name: pga11x_initialize + * + * Description: + * Initialize the PGA117 amplifier/multiplexer. + * + * Input Parameters: + * spi - An SPI "bottom half" device driver instance + * + * Returned Value: + * On success, a non-NULL opaque handle is returned; a NULL is returned + * on any failure. This handle may be used with the other PGA117 interface + * functions to control the multiplexer + * + ****************************************************************************/ + +EXTERN PGA11X_HANDLE pga11x_initialize(FAR struct spi_dev_s *spi); + +/**************************************************************************** + * Name: pga11x_select + * + * Description: + * Select an input channel and gain. + * + * Input Parameters: + * spi - An SPI "bottom half" device driver instance + * channel - See the PGA11X_CHAN_* definitions above + * gain - See the PGA11X_GAIN_* definitions above + * + * Returned Value: + * Zero on sucess; a negated errno value on failure. + * + ****************************************************************************/ + +EXTERN int pga11x_select(PGA11X_HANDLE handle, uint8_t channel, uint8_t gain); + +/**************************************************************************** + * Name: pga11x_read + * + * Description: + * Read from the PGA117 amplifier/multiplexer. + * + * Input Parameters: + * spi - An SPI "bottom half" device driver instance + * + * Returned Value: + * 16-bit value read from the device (32-bits in daisy chain mode) + * + ****************************************************************************/ + +#ifdef CONFIG_PGA11X_DAISYCHAIN +EXTERN uint32_t pga11x_read(PGA11X_HANDLE handle); +#else +EXTERN uint16_t pga11x_read(PGA11X_HANDLE handle); +#endif + +/**************************************************************************** + * Name: pga11x_noop + * + * Description: + * Perform PGA11x no-operation. + * + * Input Parameters: + * spi - An SPI "bottom half" device driver instance + * + * Returned Value: + * Zero on sucess; a negated errno value on failure. + * + ****************************************************************************/ + +EXTERN int pga11x_noop(PGA11X_HANDLE handle); + +/**************************************************************************** + * Name: pga11x_shutdown + * + * Description: + * Put the PGA11x in shutdown down mode. + * + * Input Parameters: + * spi - An SPI "bottom half" device driver instance + * + * Returned Value: + * Zero on sucess; a negated errno value on failure. + * + ****************************************************************************/ + +EXTERN int pga11x_shutdown(PGA11X_HANDLE handle); + +/**************************************************************************** + * Name: pga11x_enable + * + * Description: + * Take the PGA11x out of shutdown down mode. + * + * Input Parameters: + * spi - An SPI "bottom half" device driver instance + * + * Returned Value: + * Zero on sucess; a negated errno value on failure. + * + ****************************************************************************/ + +EXTERN int pga11x_enable(PGA11X_HANDLE handle); + +#undef EXTERN +#ifdef __cplusplus +} +#endif + +#endif /* CONFIG_INPUT && CONFIG_INPUT_PGA11X */ +#endif /* __INCLUDE_NUTTX_INPUT_PGA11X_H */ |