Tiva ADC: Adds a Tiva ADC driver. From Calvin Maguranis
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Gregory Nutt
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arch/arm/src/tiva/tiva_adc.c
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2798
arch/arm/src/tiva/tiva_adc.c
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arch/arm/src/tiva/tiva_adc.h
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arch/arm/src/tiva/tiva_adc.h
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/****************************************************************************
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* arch/arm/src/tiva/tiva_adc.h
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*
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* Copyright (C) 2015 TRD2 Inc. All rights reserved.
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* Author: Calvin Maguranis <calvin.maguranis@trd2inc.com>
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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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#ifndef __ARCH_ARM_SRC_TIVA_TIVA_ADC_H
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#define __ARCH_ARM_SRC_TIVA_TIVA_ADC_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/analog/adc.h>
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#include <nuttx/fs/ioctl.h>
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#include "chip.h"
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#include "chip/tiva_adc.h"
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#ifdef CONFIG_TIVA_ADC
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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#define TIVA_ADC_PWM_TRIG_IOCTL _ANIOC(0x00F0)
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/* PWM trigger support definitions *************************************************/
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#define ADC_TRIG_PWM_MASK \
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(0xE0000000 & ADC_EMUX_PWM0 & ADC_EMUX_PWM1 & ADC_EMUX_PWM2 & ADC_EMUX_PWM3)
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/* Encodes the PWM generator (0 to 3) value to the 2 MSB's of 32-bits;
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* PWM module (0 or 1) value in the 3rd MSB:
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* 0bGGM0.0000.0000.0000,0000.0000.0000.0000
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* To be OR'd with a trigger register value.
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*/
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#define PWM_GEN_SHIFT (31)
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#define PWM_MOD_SHIFT (30)
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# define ADC_TRIG_PWM_IOCTL(gen,mod) \
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(((gen) << PWM_GEN_SHIFT) | ((mod) << PWM_MOD_SHIFT))
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/* Decodes PWM generator number from trigger */
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#define PWM_GEN_MASK (0xC0000000)
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# define ADC_TRIG_PWM_GEN(trig) \
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(((trig)&PWM_GEN_MASK)>>(PWM_GEN_SHIFT-1))
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/* Decodes PWM module number from trigger */
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#define PWM_MOD_MASK (0x20000000)
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# define ADC_TRIG_PWM_MOD(trig) \
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(((trig)&PWM_MOD_MASK)>>(PWM_MOD_SHIFT-1))
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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#ifndef __ASSEMBLY__
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# ifdef __cplusplus
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# define EXTERN extern "C"
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extern "C"
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{
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# else
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# define EXTERN extern
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#endif
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/****************************************************************************
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* Name: tiva_adc_initialize
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*
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* Description:
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* Initialize the ADC
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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 *tiva_adc_initialize(int adc_num);
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/****************************************************************************
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* Interfaces exported from the ADC driver
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****************************************************************************/
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struct tiva_adc_s;
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/****************************************************************************
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* Name: tiva_adc_lock
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*
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* Description:
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* Get exclusive access to the ADC interface
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*
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****************************************************************************/
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void tiva_adc_lock(FAR struct tiva_adc_s *priv, int sse);
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/****************************************************************************
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* Name: tiva_adc_unlock
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*
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* Description:
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* Relinquish the lock on the ADC interface
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*
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****************************************************************************/
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void tiva_adc_unlock(FAR struct tiva_adc_s *priv, int sse);
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/****************************************************************************
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* Name: tiva_adc_getreg
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*
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* Description:
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* Read any 32-bit register using an absolute address.
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*
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****************************************************************************/
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#ifdef CONFIG_TIVA_ADC_REGDEBUG
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uint32_t tiva_adc_getreg(FAR struct tiva_adc_s *priv, uintptr_t address);
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#else
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# define tiva_adc_getreg(handle,addr) getreg32(addr)
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#endif
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/****************************************************************************
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* Name: tiva_adc_putreg
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*
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* Description:
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* Write to any 32-bit register using an absolute address.
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*
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****************************************************************************/
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#ifdef CONFIG_TIVA_ADC_REGDEBUG
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void tiva_adc_putreg(FAR struct tiva_adc_s *priv, uintptr_t address,
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uint32_t regval);
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#else
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# define tiva_adc_putreg(handle,addr,val) putreg32(val,addr)
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#endif
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# undef EXTERN
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# ifdef __cplusplus
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}
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# endif
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_TIVA_ADC */
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#endif /* __ARCH_ARM_SRC_TIVA_TIVA_ADC_H */
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