diff options
Diffstat (limited to 'nuttx/arch/z16/src/z16f/z16f_timerisr.c')
-rw-r--r-- | nuttx/arch/z16/src/z16f/z16f_timerisr.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/nuttx/arch/z16/src/z16f/z16f_timerisr.c b/nuttx/arch/z16/src/z16f/z16f_timerisr.c new file mode 100644 index 000000000..12925b933 --- /dev/null +++ b/nuttx/arch/z16/src/z16f/z16f_timerisr.c @@ -0,0 +1,135 @@ +/*************************************************************************** + * z16f/z16f_timerisr.c + * + * Copyright (C) 2008 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ***************************************************************************/ + +/*************************************************************************** + * Included Files + ***************************************************************************/ + +#include <nuttx/config.h> + +#include <sys/types.h> +#include <debug.h> + +#include <nuttx/arch.h> +#include <chip/chip.h> + +#include "clock_internal.h" +#include "up_internal.h" + +/*************************************************************************** + * Definitions + ***************************************************************************/ + +/* System clock frequency value from ZDS target settings */ + +extern _Erom unsigned long SYS_CLK_FREQ; +#define _DEFCLK ((unsigned long)&SYS_CLK_FREQ) + +/*************************************************************************** + * Private Types + ***************************************************************************/ + +/*************************************************************************** + * Private Function Prototypes + ***************************************************************************/ + +/*************************************************************************** + * Global Functions + ***************************************************************************/ + +/*************************************************************************** + * Function: up_timerisr + * + * Description: + * The timer ISR will perform a variety of services for various portions + * of the system. + * + ***************************************************************************/ + +int up_timerisr(int irq, uint32 *regs) +{ + /* Process timer interrupt */ + + sched_process_timer(); + return 0; +} + +/*************************************************************************** + * Function: up_timerinit + * + * Description: + * This function is called during start-up to initialize + * the timer interrupt. + * + ***************************************************************************/ + +void up_timerinit(void) +{ + up_disable_irq(Z16F_IRQ_SYSTIMER); + + /* Disable the timer and configure for divide by 1 and continuous mode. */ + + putreg16( Z16F_TIMERSCTL1_DIV1 | Z16F_TIMERSCTL1_CONT); + + /* Assign an intial timer value */ + + putreg16(0x0001, Z16F_TIMER0_HL); + + /* Set the timer reload value. + * + * In continuous mode: + * + * timer_frequency = system_clock_freqency / divisor / reload_value + * or + * reload_value = (system_clock_frequency / timer_frequency / divisor + * + * For system_clock_frequency=200MHz, timer_frequency=100KHz, and divisor=1, + * this yields 200. + */ + + putreg16(((uint32)_DEFCLK / 100000), Z16F_TIMER0_R); + + /* Enable the timer */ + + putreg8((getret8(Z16F_TIMER0_CTL1) |= Z16F_TIMERCTL1_TEN), Z16F_TIMER0_CTL1); + + /* Set the timer priority */ + + /* Attach and enable the timer interrupt (leaving at priority 0 */ + + irq_attach(Z16F_IRQ_SYSTIMER, (xcpt_t)up_timerisr); + up_enable_irq(Z16F_IRQ_SYSTIMER); +} + |