MicroAPRS/bertos/cpu/arm/drv/timer_lpc2.h

104 lines
3.0 KiB
C

/**
* \file
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* This file is part of BeRTOS.
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*
* \author Francesco Sacchi <batt@develer.com>
*
* \brief Low-level timer module for NXP LPC2xxx (interface).
*/
#ifndef DRV_LPC2_TIMER_H
#define DRV_LPC2_TIMER_H
#include <hw/hw_cpufreq.h> /* CPU_FREQ */
#include "cfg/cfg_timer.h" /* CONFIG_TIMER */
#include <cfg/compiler.h> /* uint8_t */
#include <cfg/macros.h> /* BV */
#include <io/lpc23xx.h>
/**
* \name Values for CONFIG_TIMER.
*
* Select which hardware timer interrupt to use for system clock and softtimers.
*
* $WIZ$ timer_select = "TIMER0_COMPARE0", "TIMER_DEFAULT"
*/
#define TIMER0_COMPARE0 0 ///< System timer on Timer0 Compare match0
#define TIMER_DEFAULT TIMER0_COMPARE0 ///< Default system timer
/*
* Hardware dependent timer initialization.
*/
#if (CONFIG_TIMER == TIMER0_COMPARE0)
ISR_PROTO_CONTEXT_SWITCH(timer_handler);
#define DEFINE_TIMER_ISR DECLARE_ISR_CONTEXT_SWITCH(timer_handler)
#define TIMER_TICKS_PER_SEC 1000
#define TIMER_HW_CNT (CPU_FREQ / TIMER_TICKS_PER_SEC - 1)
/** Frequency of the hardware high-precision timer. */
#define TIMER_HW_HPTICKS_PER_SEC (CPU_FREQ)
/** Type of time expressed in ticks of the hardware high-precision timer */
typedef uint32_t hptime_t;
#define SIZEOF_HPTIME_T 4
INLINE void timer_hw_irq(void)
{
/* Reset The match0 irq flag */
T0IR = 0x01;
/* Signal the VIC we have completed the ISR */
VICVectAddr = 0;
}
INLINE bool timer_hw_triggered(void)
{
return true;
}
INLINE hptime_t timer_hw_hpread(void)
{
return T0TC;
}
#else
#error Unimplemented value for CONFIG_TIMER
#endif /* CONFIG_TIMER */
void timer_hw_init(void);
#endif /* DRV_LPC2_TIMER_H */