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Freescale KL25Z support from Alan Carvalho de Assis

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This commit is contained in:
Gregory Nutt 2013-06-18 11:20:57 -06:00
parent 39dcedb0f1
commit 177a8c0e9b
8 changed files with 557 additions and 3 deletions
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5
ChangeLog
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@ -5000,4 +5000,7 @@
(2013-6-18)
* arch/arm/src/sam34/sam_spi.c: Fix SPI mode setting. In the SAM3/4
family, the clock phase control (CPHA) is inverted (NPHA) (2013-6-18).
* arch/arm/src/kl/chip/kl_tsi.h: Freescale KL25Z TSI register
definitions from Alan Carvalho de Assis (2013-6-18).
* configs/freedom-kl25z/src/kl_tsi.c: Example TSI driver for the
Freedom KL25Z board from Alan Carvalho de Assis (2013-6-18).

2
arch/arm/src/kl/chip/kl_memorymap.h
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@ -87,7 +87,7 @@
# define KL_RTC_BASE 0x4003d000 /* Real time clock */
# define KL_DAC0_BASE 0x4003f000 /* Digital-to-analog convert (DAC) 0 */
# define KL_LPTMR_BASE 0x40040000 /* Low power timer */
# define KL_TSI0_BASE 0x40045000 /* Touch sense interface */
# define KL_TSI_BASE 0x40045000 /* Touch sense interface */
# define KL_SIMLP_BASE 0x40047000 /* SIM low-power logic */
# define KL_SIM_BASE 0x40048000 /* System integration module (SIM) */
# define KL_PORT_BASE(n) (0x40049000 + ((n) << 12))

154
arch/arm/src/kl/chip/kl_tsi.h Normal file
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@ -0,0 +1,154 @@
/************************************************************************************
* arch/arm/src/kl/chip/kl_tsi.h
*
* Copyright (C) 2013 Alan Carvalho de Assis
* Author: Alan Carvalho de Assis <acassis@gmail.com>
*
* 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 __ARCH_ARM_SRC_KL_CHIP_KL_TSI_H
#define __ARCH_ARM_SRC_KL_CHIP_KL_TSI_H
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include "chip.h"
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
/* Register Offsets *****************************************************************/
#define KL_TSI_GENCS_OFFSET 0x0000 /* General Control and Status Register */
#define KL_TSI_DATA_OFFSET 0x0004 /* SCAN control register */
#define KL_TSI_TSHD_OFFSET 0x0008 /* Pin enable register */
/* Register Addresses ***************************************************************/
#define KL_TSI_GENCS (KL_TSI_BASE+KL_TSI_GENCS_OFFSET)
#define KL_TSI_DATA (KL_TSI_BASE+KL_TSI_DATA_OFFSET)
#define KL_TSI_TSHD (KL_TSI_BASE+KL_TSI_TSHD_OFFSET)
/* Register Bit Definitions *********************************************************/
/* General Control and Status Register */
/* Bit 0: Reserved */
#define TSI_GENCS_CURSW (1 << 1) /* Bit 1: Current sources for oscillators swapped */
#define TSI_GENCS_EOSF (1 << 2) /* Bit 2: End of scan flag */
#define TSI_GENCS_SCNIP (1 << 3) /* Bit 3: Scan in progress status */
#define TSI_GENCS_STM (1 << 4) /* Bit 4: Scan trigger mode */
#define TSI_GENCS_STPE (1 << 5) /* Bit 5: TSI STOP enable */
#define TSI_GENCS_TSIIEN (1 << 6) /* Bit 6: TSI module interrupt enable */
#define TSI_GENCS_TSIEN (1 << 7) /* Bit 7: TSI module enable */
#define TSI_GENCS_NSCN_SHIFT (8) /* Bits 8-12: Electrode oscillator count used in a scan */
#define TSI_GENCS_NSCN_MASK (31 << TSI_GENCS_NSCN_SHIFT)
# define TSI_GENCS_NSCN_TIMES(n) (((n)-1) << TSI_GENCS_NSCN_SHIFT) /* n times per electrode,n=1..32 */
#define TSI_GENCS_PS_SHIFT (13) /* Bits 13-15: Prescaler value */
#define TSI_GENCS_PS_MASK (7 << TSI_GENCS_PS_SHIFT)
# define TSI_GENCS_PS_DIV1 (0 << TSI_GENCS_PS_SHIFT) /* Electrode oscillator / 1 */
# define TSI_GENCS_PS_DIV2 (1 << TSI_GENCS_PS_SHIFT) /* Electrode oscillator / 2 */
# define TSI_GENCS_PS_DIV4 (2 << TSI_GENCS_PS_SHIFT) /* Electrode oscillator / 4 */
# define TSI_GENCS_PS_DIV8 (3 << TSI_GENCS_PS_SHIFT) /* Electrode oscillator / 8 */
# define TSI_GENCS_PS_DIV16 (4 << TSI_GENCS_PS_SHIFT) /* Electrode oscillator / 16 */
# define TSI_GENCS_PS_DIV32 (5 << TSI_GENCS_PS_SHIFT) /* Electrode oscillator / 32 */
# define TSI_GENCS_PS_DIV64 (6 << TSI_GENCS_PS_SHIFT) /* Electrode oscillator / 64 */
# define TSI_GENCS_PS_DIV128 (7 << TSI_GENCS_PS_SHIFT) /* Electrode oscillator / 128 */
#define TSI_GENCS_EXTCHRG_SHIFT (16) /* Bits 16-18: Electrode Osc charge/discharge value */
#define TSI_GENCS_EXTCHRG_MASK (7 << TSI_GENCS_EXTCHRG_SHIFT)
# define TSI_GENCS_EXTCHRG_500NA (0 << TSI_GENCS_EXTCHRG_SHIFT)
# define TSI_GENCS_EXTCHRG_1UA (1 << TSI_GENCS_EXTCHRG_SHIFT)
# define TSI_GENCS_EXTCHRG_2UA (2 << TSI_GENCS_EXTCHRG_SHIFT)
# define TSI_GENCS_EXTCHRG_4UA (3 << TSI_GENCS_EXTCHRG_SHIFT)
# define TSI_GENCS_EXTCHRG_8UA (4 << TSI_GENCS_EXTCHRG_SHIFT)
# define TSI_GENCS_EXTCHRG_16UA (5 << TSI_GENCS_EXTCHRG_SHIFT)
# define TSI_GENCS_EXTCHRG_32UA (6 << TSI_GENCS_EXTCHRG_SHIFT)
# define TSI_GENCS_EXTCHRG_64A (7 << TSI_GENCS_EXTCHRG_SHIFT)
#define TSI_GENCS_DVOLT_SHIFT (19) /* Bits 19-20: Oscilattor voltage rails */
#define TSI_GENCS_DVOLT_MASK (3 << TSI_GENCS_DVOLT_SHIFT)
# define TSI_GENCS_DVOLT_1p03V (0 << TSI_GENCS_DVOLT_SHIFT)
# define TSI_GENCS_DVOLT_0p73V (1 << TSI_GENCS_DVOLT_SHIFT)
# define TSI_GENCS_DVOLT_0p43V (2 << TSI_GENCS_DVOLT_SHIFT)
# define TSI_GENCS_DVOLT_0p29V (3 << TSI_GENCS_DVOLT_SHIFT)
#define TSI_GENCS_REFCHRG_SHIFT (21) /* Bits 21-23: Reference Osc charge/discharge value */
#define TSI_GENCS_REFCHRG_MASK (7 << TSI_GENCS_REFCHRG_SHIFT)
# define TSI_GENCS_REFCHRG_500NA (0 << TSI_GENCS_REFCHRG_SHIFT)
# define TSI_GENCS_REFCHRG_1UA (1 << TSI_GENCS_REFCHRG_SHIFT)
# define TSI_GENCS_REFCHRG_2UA (2 << TSI_GENCS_REFCHRG_SHIFT)
# define TSI_GENCS_REFCHRG_4UA (3 << TSI_GENCS_REFCHRG_SHIFT)
# define TSI_GENCS_REFCHRG_8UA (4 << TSI_GENCS_REFCHRG_SHIFT)
# define TSI_GENCS_REFCHRG_16UA (5 << TSI_GENCS_REFCHRG_SHIFT)
# define TSI_GENCS_REFCHRG_32UA (6 << TSI_GENCS_REFCHRG_SHIFT)
# define TSI_GENCS_REFCHRG_64UA (7 << TSI_GENCS_REFCHRG_SHIFT)
#define TSI_GENCS_MODE_SHIFT (24) /* Bits 24-27: Analog mode setup and status bits */
#define TSI_GENCS_MODE_MASK (15 << TSI_GENCS_MODE_SHIFT)
# define TSI_GENCS_MODE_CAPSENSING (0 << TSI_GENCS_MODE_SHIFT)
# define TSI_GENCS_MODE_SGTSHD_NOFREQ (4 << TSI_GENCS_MODE_SHIFT)
# define TSI_GENCS_MODE_SGTSHD_FRQLIM (8 << TSI_GENCS_MODE_SHIFT)
# define TSI_GENCS_MODE_AUTODETECT (12 << TSI_GENCS_MODE_SHIFT)
#define TSI_GENCS_ESOR (1 << 28) /* Bit 28: End/Out-of-range interrupt selection */
/* Bits 29-30: Reserved */
#define TSI_GENCS_OUTRFG (1 << 31) /* Bit 31: Out of range flag */
/* SCAN control register */
#define TSI_DATA_TSICNT_SHIFT (0) /* Bits 0-15: TSI Conversion counter value */
#define TSI_DATA_TSICNT_MASK (0xffff << TSI_DATA_TSICNT_SHIFT)
/* Bits 16-21: Reserved */
#define TSI_DATA_SWTS (1 << 22) /* Bit 22: Software trigger start */
#define TSI_DATA_DMAEN (1 << 23) /* Bit 23: DMA Transfer enabled */
/* Bits 24-27: Reserved */
#define TSI_DATA_TSICH_SHIFT (28) /* Bits 28-31: Current channel to be measured */
#define TSI_DATA_TSICH_MASK (15 << TSI_DATA_TSICH_SHIFT)
# define TSI_DATA_TSICH(n) (n << TSI_DATA_TSICH_SHIFT) /* Channel to measure, n=0..15 */
/* Channel n threshold register */
#define TSI_THRESHLD_HTHH_SHIFT (0) /* Bits 0-15: High threshold value */
#define TSI_THRESHLD_HTHH_MASK (0xffff << TSI_THRESHLD_HTHH_SHIFT)
#define TSI_THRESHLD_LTHH_SHIFT (16) /* Bits 16-31: Low threshold value */
#define TSI_THRESHLD_LTHH_MASK (0xffff << TSI_THRESHLD_LTHH_SHIFT)
/************************************************************************************
* Public Types
************************************************************************************/
/************************************************************************************
* Public Data
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
#endif /* __ARCH_ARM_SRC_KL_CHIP_KL_TSI_H */

14
configs/freedom-kl25z/include/board.h
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@ -312,6 +312,20 @@ extern "C" {
void kl_boardinitialize(void);
/************************************************************************************
* Name: kl_tsi_initialize
*
* Description:
* Initialize the TSI hardware and interface for the sliders on board the Freedom
* KL25Z board. Register a character driver at /dev/tsi that may be used to read
* from each sensor.
*
************************************************************************************/
#ifdef CONFIG_KL_TSI
void kl_tsi_initialize(void);
#endif
#undef EXTERN
#if defined(__cplusplus)
}

6
configs/freedom-kl25z/src/Makefile
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@ -42,6 +42,10 @@ AOBJS = $(ASRCS:.S=$(OBJEXT))
CSRCS = kl_boardinitialize.c
ifeq ($(CONFIG_KL_TSI),y)
CSRCS += kl_tsi.c
endif
ifeq ($(CONFIG_HAVE_CXX),y)
CSRCS += kl_cxxinitialize.c
endif
@ -66,7 +70,7 @@ ifeq ($(CONFIG_WATCHDOG),y)
CSRCS += kl_watchdog.c
endif
ifeq ($(CONFIG_NSH_ARCHINIT),y)
ifeq ($(CONFIG_NSH_LIBRARY),y)
CSRCS += kl_nsh.c
endif

26
configs/freedom-kl25z/src/kl_boardinitialize.c
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@ -100,3 +100,29 @@ void kl_boardinitialize(void)
kl_ledinit();
#endif
}
/****************************************************************************
* Name: board_initialize
*
* Description:
* If CONFIG_BOARD_INITIALIZE is selected, then an additional
* initialization call will be performed in the boot-up sequence to a
* function called board_initialize(). board_initialize() will be
* called immediately after up_intitialize() is called and just before the
* initial application is started. This additional initialization phase
* may be used, for example, to initialize board-specific device drivers.
*
****************************************************************************/
#ifdef CONFIG_BOARD_INITIALIZE
void board_initialize(void)
{
/* Perform NSH initialization here instead of from the NSH. This
* alternative NSH initialization is necessary when NSH is ran in user-space
* but the initialization function must run in kernel space.
*/
#if defined(CONFIG_NSH_LIBRARY) && !defined(CONFIG_NSH_ARCHINIT)
(void)nsh_archinitialize();
#endif
}
#endif

92
configs/freedom-kl25z/src/kl_nsh.c Normal file
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@ -0,0 +1,92 @@
/****************************************************************************
* config/stm32f4discovery/src/kl_nsh.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <stdio.h>
#ifdef CONFIG_NSH_LIBRARY
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Debug ********************************************************************/
#ifdef CONFIG_CPP_HAVE_VARARGS
# if defined(CONFIG_DEBUG) || !defined(CONFIG_NSH_ARCHINIT)
# define message(...) lowsyslog(__VA_ARGS__)
# else
# define message(...) printf(__VA_ARGS__)
# endif
#else
# if defined(CONFIG_DEBUG) || !defined(CONFIG_NSH_ARCHINIT)
# define message lowsyslog
# else
# define message printf
# endif
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_archinitialize
*
* Description:
* Perform architecture specific initialization
*
* CONFIG_NSH_ARCHINIT=y :
* Called from the NSH library
*
* CONFIG_BOARD_INITIALIZE=y, CONFIG_NSH_LIBRARY=y, &&
* CONFIG_NSH_ARCHINIT=n :
* Called from board_initialize().
*
****************************************************************************/
int nsh_archinitialize(void)
{
return OK;
}
#endif /* CONFIG_NSH_LIBRARY */

261
configs/freedom-kl25z/src/kl_tsi.c Normal file
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@ -0,0 +1,261 @@
/****************************************************************************
* configs/freedom-kl25z/src/kl_tsi.c
*
* Copyright (C) 2013 Alan Carvalho de Assis
* Author: Alan Carvalho de Assis <acassis@gmail.com>
* with adaptions from Gregory Nutt <gnutt@nuttx.org>
*
* Reference: https://community.freescale.com/community/
* the-embedded-beat/blog/2012/10/15/
* using-the-touch-interface-on-the-freescale-freedom-development-platform
*
* 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 <stdint.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/fs/fs.h>
#include "up_arch.h"
#include "kl_gpio.h"
#include "chip/kl_tsi.h"
#include "chip/kl_pinmux.h"
#include "chip/kl_sim.h"
#ifdef CONFIG_KL_TSI
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* The touchpad on the Freedom KL25Z board connects to the MCU via:
*
* PTB16 TWI0_CH9
* PTB17 TSI0_CH10
*/
#define NSENSORS 2
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static void tsi_calibrate(void);
static ssize_t tsi_read(FAR struct file *filep, FAR char *buffer, size_t buflen);
/****************************************************************************
* Private Data
****************************************************************************/
static uint16_t g_defcap[NSENSORS]; /* Default capacitance for each sensor */
static uint16_t g_currdelta = 0; /* Current delta for the current button */
static uint8_t g_channel = 0; /* Current g_channel */
/* Channel assigned to each sensor */
static uint8_t const g_chsensor[NSENSORS] = { 9, 10 };
/* Character driver operations */
static const struct file_operations tsi_ops =
{
0, /* open */
0, /* close */
tsi_read, /* read */
0, /* write */
0, /* seek */
0, /* ioctl */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: tsi_calibrate
****************************************************************************/
static void tsi_calibrate(void)
{
uint32_t regval;
int i;
for (i = 0; i < NSENSORS; i++)
{
/* Clear end of scan flag */
regval = getreg32(KL_TSI_GENCS);
regval |= TSI_GENCS_EOSF;
putreg32(regval, KL_TSI_GENCS);
/* Scan the next electrode */
regval = TSI_DATA_TSICH(g_chsensor[i]);
putreg32(regval, KL_TSI_DATA);
regval |= TSI_DATA_SWTS;
putreg32(regval, KL_TSI_DATA);
/* Wait until the conversion is done */
while (!(getreg32(KL_TSI_GENCS) & TSI_GENCS_EOSF));
g_defcap[i] = getreg32(KL_TSI_DATA) & TSI_DATA_TSICNT_MASK;
ivdbg("Sensor %d = %d\n", i+1, g_defcap[i]);
}
}
/****************************************************************************
* Name: tsi_read
****************************************************************************/
static ssize_t tsi_read(FAR struct file *filep, FAR char *buf, size_t buflen)
{
static int deltacap = 0;
uint32_t regval;
if (buf == NULL || buflen < 1)
{
/* Well... nothing to do */
return -EINVAL;
}
deltacap = 0;
/* Clear end of scan flag */
regval = getreg32(KL_TSI_GENCS);
regval |= TSI_GENCS_EOSF;
putreg32(regval, KL_TSI_GENCS);
/* Scan the next electrode */
regval = TSI_DATA_TSICH(g_chsensor[g_channel]);
putreg32(regval, KL_TSI_DATA);
regval |= TSI_DATA_SWTS;
putreg32(regval, KL_TSI_DATA);
/* Wait until the conversion is done*/
while (!(getreg32(KL_TSI_GENCS) & TSI_GENCS_EOSF));
/* Compute delta using calibration reference counts */
deltacap = getreg32(KL_TSI_DATA) & TSI_DATA_TSICNT_MASK;
deltacap -= g_defcap[g_channel];
if (deltacap < 0)
{
deltacap = 0;
}
g_currdelta = (uint16_t)deltacap;
ivdbg("Delta for g_channel %d = %d\n", g_channel, g_currdelta);
buf[0] = g_currdelta & 0xff;
buf[1] = (g_currdelta & 0xff00) >> 8;
buf[2] = g_channel;
/* Increment the channel index to sample the next sensor on the next timer
* that read() is called.
*/
g_channel++;
if (g_channel >= NSENSORS)
{
g_channel = 0;
}
return 3;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: kl_tsi_initialize
*
* Description:
* Initialize the TSI hardware and interface for the sliders on board the
* Freedom KL25Z board. Register a character driver at /dev/tsi that may
* be used to read from each sensor.
*
****************************************************************************/
void kl_tsi_initialize(void)
{
uint32_t regval;
/* Enable access to the TSI module */
regval = getreg32(KL_SIM_SCGC5);
regval |= SIM_SCGC5_TSI;
putreg32(regval, KL_SIM_SCGC5);
/* Configure PINs used on TSI */
kl_configgpio(PIN_TSI0_CH9);
kl_configgpio(PIN_TSI0_CH10);
/* Configure TSI parameter */
regval = getreg32(KL_TSI_GENCS);
regval |= TSI_GENCS_MODE_CAPSENSING | TSI_GENCS_REFCHRG_8UA |
TSI_GENCS_DVOLT_1p03V | TSI_GENCS_EXTCHRG_64A |
TSI_GENCS_PS_DIV16 | TSI_GENCS_NSCN_TIMES(12) | TSI_GENCS_STPE;
putreg32(regval, KL_TSI_GENCS);
/* Only after setting TSI we should enable it */
regval = getreg32(KL_TSI_GENCS);
regval |= TSI_GENCS_TSIEN;
putreg32(regval, KL_TSI_GENCS);
/* Calibrate it before to use */
tsi_calibrate();
/* And finally register the TSI character driver */
(void)register_driver("/dev/tsi", &tsi_ops, 0444, NULL);
}
#endif /* CONFIG_KL_TSI */