mirror of https://github.com/ARMmbed/mbed-os.git
86 lines
3.5 KiB
C
86 lines
3.5 KiB
C
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/**
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******************************************************************************
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* @file ticker.h
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* @brief Microcontroller uSec ticker
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* @internal
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* @author ON Semiconductor.
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* $Rev:
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* $Date:
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******************************************************************************
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* Copyright 2016 Semiconductor Components Industries LLC (d/b/a <EFBFBD>ON Semiconductor<EFBFBD>).
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* All rights reserved. This software and/or documentation is licensed by ON Semiconductor
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* under limited terms and conditions. The terms and conditions pertaining to the software
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* and/or documentation are available at http://www.onsemi.com/site/pdf/ONSEMI_T&C.pdf
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* (<EFBFBD>ON Semiconductor Standard Terms and Conditions of Sale, Section 8 Software<EFBFBD>) and
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* if applicable the software license agreement. Do not use this software and/or
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* documentation unless you have carefully read and you agree to the limited terms and
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* conditions. By using this software and/or documentation, you agree to the limited
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* terms and conditions.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
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* OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
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* ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL,
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* INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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* @endinternal
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*
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*
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*/
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#ifndef TICKER_H_
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#define TICKER_H_
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#include "types.h"
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/** Core frequency definitions. /
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*
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* These definitions should be adjusted to setup Orion core frequencies.
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*/
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#define CPU_CLOCK_ROOT_HZ ( ( unsigned long ) 32000000) /**< <b> Orion 32MHz root frequency </b> */
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#define CPU_CLOCK_DIV_32M ( 1 ) /**< <b> Divider to set up core frequency at 32MHz </b> */
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#define CPU_CLOCK_DIV_16M ( 2 ) /**< <b> Divider to set up core frequency at 16MHz </b> */
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#define CPU_CLOCK_DIV_8M ( 4 ) /**< <b> Divider to set up core frequency at 8MHz </b> */
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#define CPU_CLOCK_DIV_4M ( 8 ) /**< <b> Divider to set up core frequency at 4MHz </b> */
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#define CPU_CLOCK_DIV CPU_CLOCK_DIV_32M /**< <b> Selected divider to be used by application code </b> */
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#define configCPU_CLOCK_HZ ( ( unsigned long ) (CPU_CLOCK_ROOT_HZ/CPU_CLOCK_DIV) )
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#define configTICK_RATE_HZ ( ( unsigned long ) 1000000 ) // 1uSec ticker rate
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/* Lowest priority */
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#define configKERNEL_INTERRUPT_PRIORITY ( 0xFF )
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#define configMAX_SYSCALL_INTERRUPT_PRIORITY ( 0x8F )
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#define configSYSTICK_CLOCK_HZ configCPU_CLOCK_HZ
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/* Constants required to manipulate the core. Registers first... */
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#define portNVIC_SYSTICK_CTRL_REG ( * ( ( volatile unsigned long * ) 0xe000e010 ) )
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#define portNVIC_SYSTICK_LOAD_REG ( * ( ( volatile unsigned long * ) 0xe000e014 ) )
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#define portNVIC_SYSTICK_CURRENT_VALUE_REG ( * ( ( volatile unsigned long * ) 0xe000e018 ) )
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#define portNVIC_INT_CTRL_REG ( * ( ( volatile unsigned long * ) 0xe000ed04 ) )
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#define portNVIC_SYSPRI2_REG ( * ( ( volatile unsigned long * ) 0xe000ed20 ) )
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/* ...then bits in the registers. */
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#define portNVIC_SYSTICK_CLK_BIT ( 1UL << 2UL )
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#define portNVIC_SYSTICK_INT_BIT ( 1UL << 1UL )
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#define portNVIC_SYSTICK_ENABLE_BIT ( 1UL << 0UL )
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#define portNVIC_SYSTICK_COUNT_FLAG_BIT ( 1UL << 16UL )
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/* Orion has 4 interrupt priority bits
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*/
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#define portNVIC_SYSTICK_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 24 )
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/* API definitions */
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void fSysTickInit(void);
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void fSysTickHandler(void);
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uint32_t fSysTickRead(void);
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void fSysTickEnableInterrupt (void);
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void fSysTickDisableInterrupt (void);
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#endif // TICKER_H_
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