rt-thread-official/bsp/apollo2/libraries/drivers/regs/am_reg_systick.h

//*****************************************************************************
//
//  am_reg_systick.h
//! @file
//!
//! @brief Register macros for the SYSTICK module
//
//*****************************************************************************

//*****************************************************************************
//
// Copyright (c) 2017, Ambiq Micro
// 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 of the copyright holder 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 HOLDER 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.
//
// This is part of revision 1.2.11 of the AmbiqSuite Development Package.
//
//*****************************************************************************
#ifndef AM_REG_SYSTICK_H
#define AM_REG_SYSTICK_H

//*****************************************************************************
//
// Instance finder. (1 instance(s) available)
//
//*****************************************************************************
#define AM_REG_SYSTICK_NUM_MODULES                   1
#define AM_REG_SYSTICKn(n) \
    (REG_SYSTICK_BASEADDR + 0x00000000 * n)

//*****************************************************************************
//
// Register offsets.
//
//*****************************************************************************
#define AM_REG_SYSTICK_SYSTCSR_O                     0xE000E010
#define AM_REG_SYSTICK_SYSTRVR_O                     0xE000E014
#define AM_REG_SYSTICK_SYSTCVR_O                     0xE000E018
#define AM_REG_SYSTICK_SYSTCALIB_O                   0xE000E01C

//*****************************************************************************
//
// SYSTICK_SYSTCSR - SysTick Control and Status Register.
//
//*****************************************************************************
// Returns 1 if timer counted to 0 since last time this was read.
#define AM_REG_SYSTICK_SYSTCSR_COUNTFLAG_S           16
#define AM_REG_SYSTICK_SYSTCSR_COUNTFLAG_M           0x00010000
#define AM_REG_SYSTICK_SYSTCSR_COUNTFLAG(n)          (((uint32_t)(n) << 16) & 0x00010000)

// Enables SysTick exception request. Software can use COUNTFLAG to determine if
// SysTick has ever counted to zero. 0 = counting down to zero does not assert
// the SysTick exception request; 1 = counting down to zero asserts the SysTick
// exception request.
#define AM_REG_SYSTICK_SYSTCSR_TICKINT_S             1
#define AM_REG_SYSTICK_SYSTCSR_TICKINT_M             0x00000002
#define AM_REG_SYSTICK_SYSTCSR_TICKINT(n)            (((uint32_t)(n) << 1) & 0x00000002)

// Enables the counter. 0 = counter disabled; 1 = counter enabled.
#define AM_REG_SYSTICK_SYSTCSR_ENABLE_S              0
#define AM_REG_SYSTICK_SYSTCSR_ENABLE_M              0x00000001
#define AM_REG_SYSTICK_SYSTCSR_ENABLE(n)             (((uint32_t)(n) << 0) & 0x00000001)

//*****************************************************************************
//
// SYSTICK_SYSTRVR - SysTick Reload Value Register.
//
//*****************************************************************************
// Value to load into the SYSTCVR register when the counter is enabled and when
// it reaches 0.
#define AM_REG_SYSTICK_SYSTRVR_RELOAD_S              0
#define AM_REG_SYSTICK_SYSTRVR_RELOAD_M              0x00FFFFFF
#define AM_REG_SYSTICK_SYSTRVR_RELOAD(n)             (((uint32_t)(n) << 0) & 0x00FFFFFF)

//*****************************************************************************
//
// SYSTICK_SYSTCVR - SysTick Current Value Register.
//
//*****************************************************************************
// Reads return the current value of the SysTick counter. A write of any value
// clears the field to 0, and also clears the SYSTCSR COUNTFLAG bit to 0.
#define AM_REG_SYSTICK_SYSTCVR_CURRENT_S             0
#define AM_REG_SYSTICK_SYSTCVR_CURRENT_M             0x00FFFFFF
#define AM_REG_SYSTICK_SYSTCVR_CURRENT(n)            (((uint32_t)(n) << 0) & 0x00FFFFFF)

//*****************************************************************************
//
// SYSTICK_SYSTCALIB - SysTick Calibration Value Register.
//
//*****************************************************************************
// Indicates whether the device provides a reference clock to the processor. 0 =
// reference clock provided; 1 = no reference clock provided. If your device
// does not provide a reference clock, the SYST_CSR.CLKSOURCE bit reads-as-one
// and ignores writes.
#define AM_REG_SYSTICK_SYSTCALIB_NOREF_S             31
#define AM_REG_SYSTICK_SYSTCALIB_NOREF_M             0x80000000
#define AM_REG_SYSTICK_SYSTCALIB_NOREF(n)            (((uint32_t)(n) << 31) & 0x80000000)

// Indicates whether the TENMS value is exact. 0 = TENMS value is exact; 1 =
// TENMS value is inexact, or not given. An inexact TENMS value can affect the
// suitability of SysTick as a software real time clock.
#define AM_REG_SYSTICK_SYSTCALIB_SKEW_S              30
#define AM_REG_SYSTICK_SYSTCALIB_SKEW_M              0x40000000
#define AM_REG_SYSTICK_SYSTCALIB_SKEW(n)             (((uint32_t)(n) << 30) & 0x40000000)

// Reload value for 10ms (100Hz) timing, subject to system clock skew errors. If
// the value reads as zero, the calibration value is not known.
#define AM_REG_SYSTICK_SYSTCALIB_TENMS_S             0
#define AM_REG_SYSTICK_SYSTCALIB_TENMS_M             0x00FFFFFF
#define AM_REG_SYSTICK_SYSTCALIB_TENMS(n)            (((uint32_t)(n) << 0) & 0x00FFFFFF)

#endif // AM_REG_SYSTICK_H