mpc8xxx_timer.c

来自「eCos操作系统源码」· C语言 代码 · 共 172 行

//==========================================================================
//
//        mpc8xxx_timer.c
//
//        PowerPC MPC8xxx timer tests
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
// Copyright (C) 2003 Gary Thomas
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     gthomas
// Contributors:  gthomas
// Date:          2003-11-19
//####DESCRIPTIONEND####

#include <pkgconf/hal.h>

#include <cyg/infra/cyg_type.h>
#include <cyg/infra/cyg_ass.h>
#include <cyg/infra/testcase.h>
#include <cyg/infra/diag.h>
#include <cyg/hal/hal_arch.h>
#include <cyg/hal/mpc8xxx.h>

#ifdef CYGPKG_KERNEL
#include <cyg/kernel/kapi.h>

#define STACK_SIZE CYGNUM_HAL_STACK_SIZE_MINIMUM
static char main_thread_stack[STACK_SIZE];
static cyg_thread main_thread_thread_data;
static cyg_handle_t main_thread_thread_handle;

static cyg_vector_t  interrupt;             // Interrupt vector used by controller
static cyg_handle_t  interrupt_handle;
static cyg_interrupt interrupt_object;

static volatile intr_count;

static void 
main_thread(cyg_addrword_t param)
{
    int tries = 0;
    int old_intr_count;
    int hits = 0;

    while (++tries <= 10) {
        old_intr_count = intr_count;
        cyg_thread_delay(100);
        diag_printf("tick - count = %d\n", intr_count);
        if (intr_count != old_intr_count) hits++;
    }
    if (hits == (tries-1)) {
        CYG_TEST_PASS("mpc8xxx_timer OK");
    } else {
        diag_printf("tries = %d, hits = %d\n", tries, hits);
        CYG_TEST_FAIL("mpc8xxx_timer unreliable");
    }
    CYG_TEST_EXIT("mpc8xxx_timer");
}

// This ISR is called when the timer interrupt occurs
static int
timer_isr(cyg_vector_t vector, cyg_addrword_t data, HAL_SavedRegisters *regs)
{
    cyg_interrupt_mask(interrupt);
    return (CYG_ISR_HANDLED|CYG_ISR_CALL_DSR);  // Run the DSR
}

// This DSR is called when the timer interrupt occurs
static void
timer_dsr(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
{
    intr_count++;
    IMM->cpm_timers_ter[0] = 0xFF;  // Clears interrupt condition
    cyg_interrupt_acknowledge(interrupt);
    cyg_interrupt_unmask(interrupt);
}

#ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
externC void cyg_hal_invoke_constructors();
#endif

externC void
cyg_user_start( void )
{
#ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
    cyg_hal_invoke_constructors();
#endif
    CYG_TEST_INIT();
    CYG_TEST_INFO("cyg_user_start()");
    cyg_thread_create(1,                             // Priority
                      main_thread     ,              // entry
                      (cyg_addrword_t)0,             // entry parameter
                      "CS8900 int",                  // Name
                      &main_thread_stack[0],         // Stack
                      STACK_SIZE,                    // Size
                      &main_thread_thread_handle,    // Handle
                      &main_thread_thread_data       // Thread data structure
            );
    cyg_thread_resume(main_thread_thread_handle);    // Start it

    interrupt = CYGNUM_HAL_INTERRUPT_TIMER1;
    cyg_interrupt_create(interrupt,
                             0,                     // Priority - what goes here?
                             (cyg_addrword_t)0,     //  Data item passed to interrupt handler
                             (cyg_ISR_t *)timer_isr,
                             (cyg_DSR_t *)timer_dsr,
                             &interrupt_handle,
                             &interrupt_object);
    cyg_interrupt_attach(interrupt_handle);
    cyg_interrupt_acknowledge(interrupt);
    cyg_interrupt_unmask(interrupt);

    // Set up timer1
    IMM->cpm_timers_tmr1 = _TC_TMR_ORI | _TC_TMR_ICLK_BUS16 | (0x10<<8);
    IMM->cpm_timers_trr1 = 0x2000;  // Reference value 
    IMM->cpm_timers_tcn1 = 0;
    IMM->cpm_timers_ter[0] = 0xFF;
    IMM->cpm_timers_tgcr1 = _TC_TGCR_RST1;  // Reset & enable timer1

    cyg_scheduler_start();
    CYG_TEST_PASS("mpc8xxx_timer");
}

// -------------------------------------------------------------------------

#else  // ! CYGPKG_KERNEL
#define N_A_MSG "no kernel"
#endif // CYGPKG_KERNEL

#ifdef N_A_MSG
externC void
cyg_start( void )
{
    CYG_TEST_INIT();
    CYG_TEST_NA( N_A_MSG );
}
#endif // N_A_MSG defined ie. we are N/A.