forked from Imagelibrary/rtems
1eed6f8bfc
Pass the parameter of the clock interrupt handler to Clock_driver_support_at_tick() and Clock_driver_timecounter_tick(). This makes it possible to use the interrupt handler argument in clock drivers. Use the interrupt handler provided by Clock_driver_support_install_isr() to avoid local delarations of Clock_isr(). Update #4862.
54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/*
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* Use the last periodic interval timer (PIT3) as the system clock.
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*/
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#include <rtems.h>
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#include <bsp.h>
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#include <mcf5282/mcf5282.h>
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/*
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* Use INTC0 base
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*/
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#define CLOCK_VECTOR (64+58)
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/*
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* Periodic interval timer interrupt handler
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*/
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#define Clock_driver_support_at_tick(arg) \
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do { \
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MCF5282_PIT3_PCSR |= MCF5282_PIT_PCSR_PIF; \
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} while (0) \
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/*
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* Attach clock interrupt handler
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*/
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#define Clock_driver_support_install_isr( _new ) \
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set_vector(_new, CLOCK_VECTOR, 1)
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/*
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* Set up the clock hardware
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*
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* We need to have 1 interrupt every 10,000 microseconds
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* so we need to set prescaler to 64 and the PMR register to 0x23FE
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*/
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#define Clock_driver_support_initialize_hardware() \
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do { \
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int level; \
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int preScaleCode = 5; \
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MCF5282_INTC0_ICR58 = MCF5282_INTC_ICR_IL(PIT3_IRQ_LEVEL) | \
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MCF5282_INTC_ICR_IP(PIT3_IRQ_PRIORITY); \
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rtems_interrupt_disable( level ); \
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MCF5282_INTC0_IMRH &= ~MCF5282_INTC_IMRH_INT58; \
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MCF5282_PIT3_PCSR &= ~MCF5282_PIT_PCSR_EN; \
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rtems_interrupt_enable( level ); \
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MCF5282_PIT3_PMR = 0x23FE; \
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MCF5282_PIT3_PCSR = MCF5282_PIT_PCSR_PRE(preScaleCode) | \
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MCF5282_PIT_PCSR_PIE | \
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MCF5282_PIT_PCSR_RLD | \
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MCF5282_PIT_PCSR_EN; \
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} while (0)
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#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
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#include "../../../shared/dev/clock/clockimpl.h"
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