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/**
* @file
*
* RTEMS for Nintendo DS clock driver.
*/
/*
* Copyright (c) 2008 by Matthieu Bucchianeri <mbucchia@gmail.com>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE
*/
#include <rtems.h>
#include <bsp.h>
#include <rtems/irq.h>
#include <nds.h>
/*
* forward declaration for clock isr in clockdrv_shell.h
*/
void Clock_isr(rtems_irq_hdl_param arg);
/*
* forward declarations for methods in this file
*/
void Clock_driver_support_shutdown_hardware (void);
void Clock_driver_support_initialize_hardware (void);
/*
* isr registration variables.
*/
static rtems_irq_connect_data clock_isr_data = {
.name = IRQ_TIMER0,
.hdl = Clock_isr,
.handle = NULL,
.on = NULL,
.off = NULL,
.isOn = NULL,
};
void update_touchscreen (void);
/*
* function called on every ticks.
* NOTE: replaced by macro to avoid empty function call.
*/
#define Clock_driver_support_at_tick() \
update_touchscreen();
/*
* install isr for clock driver.
*/
#define Clock_driver_support_install_isr( _new, _old ) \
do { \
_old = NULL; \
BSP_install_rtems_irq_handler(&clock_isr_data); \
} while (0)
/*
* disable clock.
*/
void Clock_driver_support_shutdown_hardware (void)
{
BSP_remove_rtems_irq_handler (&clock_isr_data);
TIMER_CR (0) &= ~(TIMER_ENABLE);
}
/*
* initialize clock on timer 0.
*/
void Clock_driver_support_initialize_hardware (void)
{
uint32_t freq =
1000 / (rtems_configuration_get_microseconds_per_tick () / 1000);
printk ("[+] clock started\n");
TIMER_CR (0) = TIMER_ENABLE | TIMER_IRQ_REQ | TIMER_DIV_64;
printk ("[#] setting clock to %u hz\n", freq);
TIMER_DATA (0) = TIMER_FREQ_64 ((uint16_t) freq);
}
#include "../../../shared/clockdrv_shell.h"
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