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initial interrupt stuff

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taken from Contiki
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Mariano Alvira 2009-04-20 14:28:53 -04:00
parent d25385d2aa
commit e012142abe
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84
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/******************************************************************************
*
* $RCSfile: interrupt-utils.c,v $
* $Revision: 1.2 $
*
* This module provides the interface routines for setting up and
* controlling the various interrupt modes present on the ARM processor.
* Copyright 2004, R O SoftWare
* No guarantees, warrantees, or promises, implied or otherwise.
* May be used for hobby or commercial purposes provided copyright
* notice remains intact.
*
*****************************************************************************/
#include "interrupt-utils.h"
#define IRQ_MASK 0x00000080
#define FIQ_MASK 0x00000040
#define INT_MASK (IRQ_MASK | FIQ_MASK)
static inline unsigned __get_cpsr(void)
{
unsigned long retval;
asm volatile (" mrs %0, cpsr" : "=r" (retval) : /* no inputs */ );
return retval;
}
static inline void __set_cpsr(unsigned val)
{
asm volatile (" msr cpsr_c, %0" : /* no outputs */ : "r" (val) );
}
unsigned disableIRQ(void)
{
unsigned _cpsr;
_cpsr = __get_cpsr();
__set_cpsr(_cpsr | IRQ_MASK);
return _cpsr;
}
unsigned restoreIRQ(unsigned oldCPSR)
{
unsigned _cpsr;
_cpsr = __get_cpsr();
__set_cpsr((_cpsr & ~IRQ_MASK) | (oldCPSR & IRQ_MASK));
return _cpsr;
}
unsigned enableIRQ(void)
{
unsigned _cpsr;
_cpsr = __get_cpsr();
__set_cpsr(_cpsr & ~IRQ_MASK);
return _cpsr;
}
unsigned disableFIQ(void)
{
unsigned _cpsr;
_cpsr = __get_cpsr();
__set_cpsr(_cpsr | FIQ_MASK);
return _cpsr;
}
unsigned restoreFIQ(unsigned oldCPSR)
{
unsigned _cpsr;
_cpsr = __get_cpsr();
__set_cpsr((_cpsr & ~FIQ_MASK) | (oldCPSR & FIQ_MASK));
return _cpsr;
}
unsigned enableFIQ(void)
{
unsigned _cpsr;
_cpsr = __get_cpsr();
__set_cpsr(_cpsr & ~FIQ_MASK);
return _cpsr;
}

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/*
* Defines and Macros for Interrupt-Service-Routines
* collected and partly created by
* Martin Thomas <mthomas@rhrk.uni-kl.de>
*
* Copyright 2005 M. Thomas
* No guarantees, warrantees, or promises, implied or otherwise.
* May be used for hobby or commercial purposes provided copyright
* notice remains intact.
*/
#ifndef interrupt_utils_
#define interrupt_utils_
/*
The following defines are usefull for
interrupt service routine declarations.
*/
/*
RAMFUNC
Attribute which defines a function to be located
in memory section .fastrun and called via "long calls".
See linker-skript and startup-code to see how the
.fastrun-section is handled.
The definition is not only useful for ISRs but since
ISRs should be executed fast the macro is defined in
this header.
*/
#define RAMFUNC __attribute__ ((long_call, section (".fastrun")))
/*
INTFUNC
standard attribute for arm-elf-gcc which marks
a function as ISR (for the VIC). Since gcc seems
to produce wrong code if this attribute is used in
thumb/thumb-interwork the attribute should only be
used for "pure ARM-mode" binaries.
*/
#define INTFUNC __attribute__ ((interrupt("IRQ")))
/*
NACKEDFUNC
gcc will not add any code to a function declared
"nacked". The user has to take care to save registers
and add the needed code for ISR functions. Some
macros for this tasks are provided below.
*/
#define NACKEDFUNC __attribute__((naked))
/******************************************************************************
*
* MACRO Name: ISR_STORE()
*
* Description:
* This MACRO is used upon entry to an ISR with interrupt nesting.
* Should be used together with ISR_ENABLE_NEST(). The MACRO
* performs the following steps:
*
* 1 - Save the non-banked registers r0-r12 and lr onto the IRQ stack.
*
*****************************************************************************/
#define ISR_STORE() asm volatile( \
"STMDB SP!,{R0-R12,LR}\n" )
/******************************************************************************
*
* MACRO Name: ISR_RESTORE()
*
* Description:
* This MACRO is used upon exit from an ISR with interrupt nesting.
* Should be used together with ISR_DISABLE_NEST(). The MACRO
* performs the following steps:
*
* 1 - Load the non-banked registers r0-r12 and lr from the IRQ stack.
* 2 - Adjusts resume adress
*
*****************************************************************************/
#define ISR_RESTORE() asm volatile( \
"LDMIA SP!,{R0-R12,LR}\n" \
"SUBS R15,R14,#0x0004\n" )
/******************************************************************************
*
* MACRO Name: ISR_ENABLE_NEST()
*
* Description:
* This MACRO is used upon entry from an ISR with interrupt nesting.
* Should be used after ISR_STORE.
*
*****************************************************************************/
#define ISR_ENABLE_NEST() asm volatile( \
"MRS LR, SPSR \n" \
"STMFD SP!, {LR} \n" \
"MSR CPSR_c, #0x1f \n" \
"STMFD SP!, {LR} " )
/******************************************************************************
*
* MACRO Name: ISR_DISABLE_NEST()
*
* Description:
* This MACRO is used upon entry from an ISR with interrupt nesting.
* Should be used before ISR_RESTORE.
*
*****************************************************************************/
#define ISR_DISABLE_NEST() asm volatile( \
"LDMFD SP!, {LR} \n" \
"MSR CPSR_c, #0x92 \n" \
"LDMFD SP!, {LR} \n" \
"MSR SPSR_cxsf, LR \n" )
/*
* The following marcos are from the file "armVIC.h" by:
*
* Copyright 2004, R O SoftWare
* No guarantees, warrantees, or promises, implied or otherwise.
* May be used for hobby or commercial purposes provided copyright
* notice remains intact.
*
*/
/******************************************************************************
*
* MACRO Name: ISR_ENTRY()
*
* Description:
* This MACRO is used upon entry to an ISR. The current version of
* the gcc compiler for ARM does not produce correct code for
* interrupt routines to operate properly with THUMB code. The MACRO
* performs the following steps:
*
* 1 - Adjust address at which execution should resume after servicing
* ISR to compensate for IRQ entry
* 2 - Save the non-banked registers r0-r12 and lr onto the IRQ stack.
* 3 - Get the status of the interrupted program is in SPSR.
* 4 - Push it onto the IRQ stack as well.
*
*****************************************************************************/
#define ISR_ENTRY() asm volatile(" sub lr, lr,#4\n" \
" stmfd sp!,{r0-r12,lr}\n" \
" mrs r1, spsr\n" \
" stmfd sp!,{r1}")
/******************************************************************************
*
* MACRO Name: ISR_EXIT()
*
* Description:
* This MACRO is used to exit an ISR. The current version of the gcc
* compiler for ARM does not produce correct code for interrupt
* routines to operate properly with THUMB code. The MACRO performs
* the following steps:
*
* 1 - Recover SPSR value from stack
* 2 - and restore its value
* 3 - Pop the return address & the saved general registers from
* the IRQ stack & return
*
*****************************************************************************/
#define ISR_EXIT() asm volatile(" ldmfd sp!,{r1}\n" \
" msr spsr_c,r1\n" \
" ldmfd sp!,{r0-r12,pc}^")
/******************************************************************************
*
* Function Name: disableIRQ()
*
* Description:
* This function sets the IRQ disable bit in the status register
*
* Calling Sequence:
* void
*
* Returns:
* previous value of CPSR
*
*****************************************************************************/
unsigned disableIRQ(void);
/******************************************************************************
*
* Function Name: enableIRQ()
*
* Description:
* This function clears the IRQ disable bit in the status register
*
* Calling Sequence:
* void
*
* Returns:
* previous value of CPSR
*
*****************************************************************************/
unsigned enableIRQ(void);
/******************************************************************************
*
* Function Name: restoreIRQ()
*
* Description:
* This function restores the IRQ disable bit in the status register
* to the value contained within passed oldCPSR
*
* Calling Sequence:
* void
*
* Returns:
* previous value of CPSR
*
*****************************************************************************/
unsigned restoreIRQ(unsigned oldCPSR);
/******************************************************************************
*
* Function Name: disableFIQ()
*
* Description:
* This function sets the FIQ disable bit in the status register
*
* Calling Sequence:
* void
*
* Returns:
* previous value of CPSR
*
*****************************************************************************/
unsigned disableFIQ(void);
/******************************************************************************
*
* Function Name: enableFIQ()
*
* Description:
* This function clears the FIQ disable bit in the status register
*
* Calling Sequence:
* void
*
* Returns:
* previous value of CPSR
*
*****************************************************************************/
unsigned enableFIQ(void);
/******************************************************************************
*
* Function Name: restoreFIQ()
*
* Description:
* This function restores the FIQ disable bit in the status register
* to the value contained within passed oldCPSR
*
* Calling Sequence:
* void
*
* Returns:
* previous value of CPSR
*
*****************************************************************************/
unsigned restoreFIQ(unsigned oldCPSR);
#endif

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#include <sys-interrupt.h>
#include <interrupt-utils.h>
#include <AT91SAM7S64.h>
#define ATTR
#ifndef NULL
#define NULL 0
#endif
static SystemInterruptHandler *handlers = NULL;
static void
system_int_safe (void) __attribute__((noinline));
static void
system_int_safe (void)
{
SystemInterruptHandler *h;
h = handlers;
while (h) {
if (h->handler()) break;
h = h->next;
}
}
static void NACKEDFUNC ATTR
system_int (void) /* System Interrupt Handler */
{
ISR_ENTRY();
system_int_safe();
*AT91C_AIC_EOICR = 0; /* End of Interrupt */
ISR_EXIT();
}
static unsigned int enabled = 0; /* Number of times the system
interrupt has been enabled */
#define DIS_INT *AT91C_AIC_IDCR = (1 << AT91C_ID_SYS)
#define EN_INT if (enabled > 0) *AT91C_AIC_IECR = (1 << AT91C_ID_SYS)
void
sys_interrupt_enable()
{
if (enabled++ == 0) {
/* Level trigged at priority 5 */
AT91C_AIC_SMR[AT91C_ID_SYS] = AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL | 5;
/* Interrupt vector */
AT91C_AIC_SVR[AT91C_ID_SYS] = (unsigned long) system_int;
/* Enable */
EN_INT;
}
}
void
sys_interrupt_disable()
{
if (--enabled == 0) {
DIS_INT;
}
}
void
sys_interrupt_append_handler(SystemInterruptHandler *handler)
{
SystemInterruptHandler **h = &handlers;
while(*h) {
h = &(*h)->next;
}
DIS_INT;
*h = handler;
handler->next = NULL;
EN_INT;
}
void
sys_interrupt_prepend_handler(SystemInterruptHandler *handler)
{
DIS_INT;
handler->next = handlers;
handlers = handler;
EN_INT;
}
void
sys_interrupt_remove_handler(SystemInterruptHandler *handler)
{
SystemInterruptHandler **h = &handlers;
while(*h) {
if (*h == handler) {
DIS_INT;
*h = handler->next;
EN_INT;
break;
}
h = &(*h)->next;
}
}

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#ifndef __SYS_INTERRUPT_H__QIHZ66NP8K__
#define __SYS_INTERRUPT_H__QIHZ66NP8K__
/* Returns true if it handled an activbe interrupt */
typedef int (*SystemInterruptFunc)();
typedef struct _SystemInterruptHandler SystemInterruptHandler;
struct _SystemInterruptHandler
{
SystemInterruptHandler *next;
SystemInterruptFunc handler;
};
void
sys_interrupt_enable();
void
sys_interrupt_disable();
void
sys_interrupt_append_handler(SystemInterruptHandler *handler);
void
sys_interrupt_prepend_handler(SystemInterruptHandler *handler);
void
sys_interrupt_remove_handler(SystemInterruptHandler *handler);
#endif /* __SYS_INTERRUPT_H__QIHZ66NP8K__ */

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/* Timer registers are all 16-bit wide with 16-bit access only */
#define TMR_OFFSET (0x20)
#define TMR_BASE (0x80007000)
#define TMR0_BASE (TMR_BASE)
#define TMR1_BASE (TMR_BASE + TMR_OFFSET*1)
#define TMR2_BASE (TMR_BASE + TMR_OFFSET*2)
#define TMR3_BASE (TMR_BASE + TMR_OFFSET*3)
#define TMR_REGOFF_COMP1 (0x0)
#define TMR_REGOFF_COMP2 (0x2)
#define TMR_REGOFF_CAPT (0x4)
#define TMR_REGOFF_LOAD (0x6)
#define TMR_REGOFF_HOLD (0x8)
#define TMR_REGOFF_CNTR (0xa)
#define TMR_REGOFF_CTRL (0xc)
#define TMR_REGOFF_SCTRL (0xe)
#define TMR_REGOFF_CMPLD1 (0x10)
#define TMR_REGOFF_CMPLD2 (0x12)
#define TMR_REGOFF_CSCTRL (0x14)
#define TMR_REGOFF_ENBL (0x1e)
/* Timer 0 registers */
#define TMR0_COMP1 (TMR0_BASE + TMR_REGOFF_COMP1)
#define TMR0_COMP_UP TMR0_COMP1
#define TMR0_COMP2 (TMR0_BASE + TMR_REGOFF_COMP2)
#define TMR0_COMP_DOWN TMR0_COMP2
#define TMR0_CAPT (TMR0_BASE + TMR_REGOFF_CAPT)
#define TMR0_LOAD (TMR0_BASE + TMR_REGOFF_LOAD)
#define TMR0_HOLD (TMR0_BASE + TMR_REGOFF_HOLD)
#define TMR0_CNTR (TMR0_BASE + TMR_REGOFF_CTRL)
#define TMR0_CTRL (TMR0_BASE + TMR_REGOFF_CTRL)
#define TMR0_SCTRL (TMR0_BASE + TMR_REGOFF_SCTRL)
#define TMR0_CMPLD1 (TMR0_BASE + TMR_REGOFF_CMPLD1)
#define TMR0_CMPLD2 (TMR0_BASE + TMR_REGOFF_CMPLD2)
#define TMR0_CSCTRL (TMR0_BASE + TMR_REGOFF_CSCTRL)
/* one enable register to rule them all */
#define TMR_ENBL TMR0_BASE + TMR_REGOFF_ENBL
#define MBAR_GPIO 0x80000000
#define GPIO_PAD_DIR0 0x80000000
#define GPIO_DATA0 0x80000008
#define UART1_DATA 0x80005008
#define DELAY 400000
#define reg32(x) (*(volatile uint32_t *)(x))
#define reg16(x) (*(volatile uint16_t *)(x))
#include "embedded_types.h"
__attribute__ ((section ("startup")))
void main(void) {
/* pin direction */
reg32(GPIO_PAD_DIR0) = 0x00000400;
/* timer setup */
/* CTRL */
#define COUNT_MODE 1 /* use rising edge of primary source */
#define PRIME_SRC 0xf /* Perip. clock with 128 prescale (for 24Mhz = 187500Hz)*/
#define SEC_SRC 0 /* don't need this */
#define ONCE 0 /* keep counting */
#define LEN 1 /* count until compare then reload with value in LOAD */
#define DIR 0 /* count up */
#define CO_INIT 0 /* other counters cannot force a re-initialization of this counter */
#define OUT_MODE 0 /* OFLAG is asserted while counter is active */
reg16(TMR_ENBL) = 0; /* tmrs reset to enabled */
reg16(TMR0_SCTRL) = 0;
reg16(TMR0_LOAD) = 0; /* reload to zero */
reg16(TMR0_COMP_UP) = 18750; /* trigger a reload at the end */
reg16(TMR0_CMPLD1) = 18750; /* compare 1 triggered reload level, 10HZ maybe? */
reg16(TMR0_CNTR) = 0; /* reset count register */
reg16(TMR0_CTRL) = (COUNT_MODE<<13) | (PRIME_SRC<<9) | (SEC_SRC<<7) | (ONCE<<6) | (LEN<<5) | (DIR<<4) | (CO_INIT<<3) | (OUT_MODE);
reg16(TMR_ENBL) = 0xf; /* enable all the timers --- why not? */
while(1) {
/* blink on */
reg32(GPIO_DATA0) = 0x00000400;
while((reg16(TMR0_SCTRL)>>15) == 0) { continue; }
reg16(TMR0_SCTRL) = 0; /*clear bit 15, and all the others --- should be ok, but clearly not "the right thing to do" */
/* blink off */
reg32(GPIO_DATA0) = 0x00000000;
while((reg16(TMR0_SCTRL)>>15) == 0) { continue; }
reg16(TMR0_SCTRL) = 0; /*clear bit 15, and all the others --- should be ok, but clearly not "the right thing to do" */
};
}