diff options
Diffstat (limited to 'nuttx/configs/z80sim/src/z80_timerisr.c')
| -rw-r--r-- | nuttx/configs/z80sim/src/z80_timerisr.c | 112 |
1 files changed, 27 insertions, 85 deletions
diff --git a/nuttx/configs/z80sim/src/z80_timerisr.c b/nuttx/configs/z80sim/src/z80_timerisr.c index 603a66c91..e56678d13 100644 --- a/nuttx/configs/z80sim/src/z80_timerisr.c +++ b/nuttx/configs/z80sim/src/z80_timerisr.c @@ -1,7 +1,7 @@ -/************************************************************ - * dm320/dm320_timerisr.c +/**************************************************************************** + * board/z80_timerisr.c * - * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved. * Author: Gregory Nutt <spudmonkey@racsa.co.cr> * * Redistribution and use in source and binary forms, with or without @@ -14,7 +14,7 @@ * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. - * 3. Neither the name Gregory Nutt nor the names of its contributors may be + * 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. * @@ -31,89 +31,48 @@ * 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 "clock_internal.h" #include "up_internal.h" -#include "up_arch.h" -/************************************************************ +/**************************************************************************** * Definitions - ************************************************************/ + ****************************************************************************/ -/* DM320 Timers - * - * Each of the general-purpose timers can run in one of two modes: one- - * shot mode and free-run mode. In one-shot mode, an interrupt only - * occurs once and then the timer must be explicitly reset to begin the - * timing operation again. In free-run mode, when the timer generates an - * interrupt, the timer counter is automatically reloaded to start the count - * operation again. Use the bit field MODE in TMMDx to configure the - * timer for one-shot more or free-run mode. The bit field MODE in TMMDx - * also allows you to stop the timer. - * - * Either the ARM clock divided by 2 (CLK_ARM/2) or an external clock - * connected to the M27XI pin can be selected as the clock source of the - * timer. - * - * The actual clock frequency used in the timer count operation is the input - * clock divided by: 1 plus the value set in the bit field PRSCL of the - * register TMPRSCLx (10 bits). The timer expires when it reaches the - * value set in the bit field DIV of the register TMDIVx (16 bits) plus 1. - * PRSCL+1 is the source clock frequency divide factor and DIV+1 is the - * timer count value. The frequency of a timer interrupt is given by the - * following equation: - * - * Interrupt Frequency = (Source Clock Frequency) / (PRSCL+1) / (DIV+1) - */ - -/* System Timer - * - * Timer0 is dedicated as the system timer. The rate of system timer - * interrupts is assumed to to 10MS per tick / 100Hz. The following - * register settings are used for timer 0 - * - * System clock formula: - * Interrupt Frequency = (Source Clock Frequency) / (PRSCL+1) / (DIV+1) - * Source Clock Frequency = 27MHz (PLL clock) - * DIV = 26,999 (Yields 1Khz timer clock) - * PRSCL = 9 (Produces 100Hz interrupts) - */ - -#define DM320_TMR0_MODE DM320_TMR_MODE_FREERUN /* Free running */ -#define DM320_TMR0_DIV 26999 /* (see above) */ -#define DM320_TMR0_PRSCL 9 /* (see above) */ - -/************************************************************ +/**************************************************************************** * 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 systems. + * The timer ISR will perform a variety of services for various portions of + * the system. * - ************************************************************/ + ****************************************************************************/ -int up_timerisr(int irq, uint32 *regs) +int up_timerisr(int irq, FAR chipreg_t *regs) { /* Process timer interrupt */ @@ -121,33 +80,16 @@ int up_timerisr(int irq, uint32 *regs) return 0; } -/************************************************************ +/**************************************************************************** * Function: up_timerinit * * Description: - * This function is called during start-up to initialize - * the timer interrupt. + * This function is called during start-up to initialize the timer + * interrupt. * - ************************************************************/ + ****************************************************************************/ void up_timerinit(void) { - up_disable_irq(DM320_IRQ_SYSTIMER); - - /* Start timer0 running so that an interrupt is generated at - * the rate MSEC_PER_TICK. - */ - - putreg16(DM320_TMR0_PRSCL, DM320_TIMER0_TMPRSCL); /* Timer 0 Prescalar */ - putreg16(DM320_TMR0_DIV, DM320_TIMER0_TMDIV); /* Timer 0 Divisor (count) */ - - /* Start the timer */ - - putreg16(DM320_TMR0_MODE, DM320_TIMER0_TMMD); /* Timer 0 Mode */ - - /* Attach and enable the timer interrupt */ - - irq_attach(DM320_IRQ_SYSTIMER, (xcpt_t)up_timerisr); - up_enable_irq(DM320_IRQ_SYSTIMER); } |