sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
b301471adb
nuttx/arch/arm/src/sama5/sam_tc.h

234 lines
7.6 KiB
C
Raw Blame History

/****************************************************************************
* arch/arm/src/sama5/sam_adc.h
*
* 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.
*
****************************************************************************/
#ifndef __ARCH_ARM_SRC_SAMA5_SAM_TC_H
#define __ARCH_ARM_SRC_SAMA5_SAM_TC_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include "chip.h"
#include "chip/sam_tc.h"
#if defined(CONFIG_SAMA5_TC0) || defined(CONFIG_SAMA5_TC1)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* The timer/counter and channel arguments to sam_tc_allocate() */
#define TC_CHAN0 0
#define TC_CHAN1 1
#define TC_CHAN2 2
#define TC_CHAN3 3
#define TC_CHAN4 4
#define TC_CHAN5 5
/* Register identifier used with sam_tc_setregister */
#define TC_REGA 0
#define TC_REGB 1
#define TC_REGC 2
/****************************************************************************
* Public Types
****************************************************************************/
typedef void *TC_HANDLE;
/****************************************************************************
* Public Data
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: sam_tc_allocate
*
* Description:
* Configures a Timer Counter to operate in the given mode. The timer is
* stopped after configuration and must be restarted with sam_tc_start().
* All the interrupts of the timer are also disabled.
*
* Input Parameters:
* channel TC channel number (see TC_CHANx definitions)
* mode Operating mode (TC_CMR value).
*
* Returned Value:
* On success, a non-NULL handle value is returned. This handle may be
* used with subsequent timer/counter interfaces to manage the timer. A
* NULL handle value is returned on a failure.
*
****************************************************************************/
TC_HANDLE sam_tc_allocate(int channel, int mode);
/****************************************************************************
* Name: sam_tc_free
*
* Description:
* Release the handle previously allocated by sam_tc_allocate().
*
* Input Parameters:
* handle Channel handle previously allocated by sam_tc_allocate()
*
* Returned Value:
* None
*
****************************************************************************/
void sam_tc_free(TC_HANDLE handle);
/****************************************************************************
* Name: sam_tc_start
*
* Description:
* Reset and Start the TC Channel. Enables the timer clock and performs a
* software reset to start the counting.
*
* Input Parameters:
* handle Channel handle previously allocated by sam_tc_allocate()
*
* Returned Value:
*
****************************************************************************/
void sam_tc_start(TC_HANDLE handle);
/****************************************************************************
* Name: sam_tc_stop
*
* Description:
* Stop TC Channel. Disables the timer clock, stopping the counting.
*
* Input Parameters:
* handle Channel handle previously allocated by sam_tc_allocate()
*
* Returned Value:
*
****************************************************************************/
void sam_tc_stop(TC_HANDLE handle);
/****************************************************************************
* Name: sam_tc_setregister
*
* Description:
* Set TC_RA, TC_RB, or TC_RB using the provided divisor. The actual
* setting in the register will be the TC input frequency divided by
* the provided divider (which should derive from the divider returned
* by sam_tc_divider).
*
*
* Input Parameters:
* handle Channel handle previously allocated by sam_tc_allocate()
*
* Returned Value:
* None
*
****************************************************************************/
void sam_tc_setregister(TC_HANDLE handle, int reg, unsigned int div);
/****************************************************************************
* Name: sam_tc_frequency
*
* Description:
* Return the timer input frequency, that is, the MCK frequency divided
* down so that the timer/counter is driven within its maximum frequency.
*
* Input Parameters:
* None
*
* Returned Value:
* The timer input frequency.
*
****************************************************************************/
uint32_t sam_tc_frequency(void);
/****************************************************************************
* Name: sam_tc_divisor
*
* Description:
* Finds the best MCK divisor given the timer frequency and MCK. The
* result is guaranteed to satisfy the following equation:
*
* (Ftc / (div * 65536)) <= freq <= (Ftc / dev)
*
* where:
* freq - the desitred frequency
* Ftc - The timer/counter input frequency
* div - With DIV being the highest possible value.
*
* Input Parameters:
* frequency Desired timer frequency.
* div Divisor value.
* tcclks TCCLKS field value for divisor.
*
* Returned Value:
* Zero (OK) if a proper divisor has been found, otherwise a negated errno
* value indicating the nature of the failure.
*
****************************************************************************/
int sam_tc_divisor(uint32_t frequency, uint32_t *div, uint32_t *tcclks);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* CONFIG_SAMA5_TC0 || CONFIG_SAMA5_TC1 */
#endif /* __ARCH_ARM_SRC_SAMA5_SAM_TC_H */
Reference in New Issue View Git Blame Copy Permalink