Для AT91SAM7s256 взял из папки ИАРа для платы sam7s-ek пример basic PWM project. Загружаю его в SRAM самбой, проект запускается, генерация шима есть, но в прерывание не попадает ? Файл Board_cstartup_iar.s стандартный, IAR5.4 ? В чем может быть дело ? Может ли мешать вывод отладочной информации через DBGU com порт?
Вот мой файл Board_cstartup_iar.s
Код
/*
IAR startup file for AT91SAM7S microcontrollers.
*/
MODULE ?cstartup
;; Forward declaration of sections.
SECTION IRQ_STACK:DATA:NOROOT(2)
SECTION CSTACK:DATA:NOROOT(3)
//------------------------------------------------------------------------------
// Headers
//------------------------------------------------------------------------------
#define __ASSEMBLY__
#include "at91sam7s256/AT91SAM7S256.h"
//------------------------------------------------------------------------------
// Definitions
//------------------------------------------------------------------------------
#define ARM_MODE_ABT 0x17
#define ARM_MODE_FIQ 0x11
#define ARM_MODE_IRQ 0x12
#define ARM_MODE_SVC 0x13
#define ARM_MODE_SYS 0x1F
#define I_BIT 0x80
#define F_BIT 0x40
//------------------------------------------------------------------------------
// Startup routine
//------------------------------------------------------------------------------
/*
Exception vectors
*/
SECTION .vectors:CODE:NOROOT(2)
PUBLIC resetVector
PUBLIC irqHandler
EXTERN Undefined_Handler
EXTERN SWI_Handler
EXTERN Prefetch_Handler
EXTERN Abort_Handler
EXTERN FIQ_Handler
ARM
__iar_init$$done: ; The interrupt vector is not needed
; until after copy initialization is done
resetVector:
; All default exception handlers (except reset) are
; defined as weak symbol definitions.
; If a handler is defined by the application it will take precedence.
LDR pc, =resetHandler ; Reset
LDR pc, Undefined_Addr ; Undefined instructions
LDR pc, SWI_Addr ; Software interrupt (SWI/SYS)
LDR pc, Prefetch_Addr ; Prefetch abort
LDR pc, Abort_Addr ; Data abort
B . ; RESERVED
LDR pc, =irqHandler ; IRQ
LDR pc, FIQ_Addr ; FIQ
Undefined_Addr: DCD Undefined_Handler
SWI_Addr: DCD SWI_Handler
Prefetch_Addr: DCD Prefetch_Handler
Abort_Addr: DCD Abort_Handler
FIQ_Addr: DCD FIQ_Handler
/*
Handles incoming interrupt requests by branching to the corresponding
handler, as defined in the AIC. Supports interrupt nesting.
*/
irqHandler:
/* Save interrupt context on the stack to allow nesting */
SUB lr, lr, #4
STMFD sp!, {lr}
MRS lr, SPSR
STMFD sp!, {r0, lr}
/* Write in the IVR to support Protect Mode */
LDR lr, =AT91C_BASE_AIC
LDR r0, [r14, #AIC_IVR]
STR lr, [r14, #AIC_IVR]
/* Branch to interrupt handler in Supervisor mode */
MSR CPSR_c, #ARM_MODE_SYS
STMFD sp!, {r1-r3, r4, r12, lr}
MOV lr, pc
BX r0
LDMIA sp!, {r1-r3, r4, r12, lr}
MSR CPSR_c, #ARM_MODE_IRQ | I_BIT
/* Acknowledge interrupt */
LDR lr, =AT91C_BASE_AIC
STR lr, [r14, #AIC_EOICR]
/* Restore interrupt context and branch back to calling code */
LDMIA sp!, {r0, lr}
MSR SPSR_cxsf, lr
LDMIA sp!, {pc}^
/*
After a reset, execution starts here, the mode is ARM, supervisor
with interrupts disabled.
Initializes the chip and branches to the main() function.
*/
SECTION .cstartup:CODE:NOROOT(2)
PUBLIC resetHandler
EXTERN LowLevelInit
EXTERN ?main
REQUIRE resetVector
ARM
resetHandler:
/* Set pc to actual code location (i.e. not in remap zone) */
LDR pc, =label
/* Perform low-level initialization of the chip using LowLevelInit() */
label:
LDR r0, =LowLevelInit
LDR r4, =SFE(CSTACK)
MOV sp, r4
MOV lr, pc
BX r0
/* Set up the interrupt stack pointer. */
MSR cpsr_c, #ARM_MODE_IRQ | I_BIT | F_BIT ; Change the mode
LDR sp, =SFE(IRQ_STACK)
/* Set up the SYS stack pointer. */
MSR cpsr_c, #ARM_MODE_SYS | F_BIT ; Change the mode
LDR sp, =SFE(CSTACK)
/* Branch to main() */
LDR r0, =?main
MOV lr, pc
BX r0
/* Loop indefinitely when program is finished */
loop4:
B loop4
END
вот обработчик
Код
//------------------------------------------------------------------------------
/// Interrupt handler for the PWM controller. Counts the number of periods and
/// updates the duty cycle after a given number.
//------------------------------------------------------------------------------
void ISR_Pwmc(void)
{
static unsigned int count = 0;
static unsigned int duty = MIN_DUTY_CYCLE;
static unsigned char fade = 1;
m_pPio->PIO_CODR = BIT18; //для проверки входа в прерывание зажигаем светодиод
// Interrupt on channel #0
if ((AT91C_BASE_PWMC->PWMC_ISR & AT91C_PWMC_CHID0) == AT91C_PWMC_CHID0)
{
count++;
if (count == 5000) //раз в полсекунды меняем длительность импульса
{
printf("new duty=%u", duty);
count = 0;
duty = fade ? duty+1 : duty-1;
PWMC_SetDutyCycle(CHANNEL_PWM0, duty);
//PWMC_SetDutyCycle(CHANNEL_PWM1, duty);
//PWMC_SetDutyCycle(CHANNEL_PWM2, duty);
//PWMC_SetDutyCycle(CHANNEL_PWM3, duty);
if (duty == MAX_DUTY_CYCLE || duty == MIN_DUTY_CYCLE)
{
fade ^= 1;
}
}
}
}
вот main.c
Код
int main(void)
{
//__disable_interrupt(); //пробовал, непомогло
// DBGU output configuration
TRACE_CONFIGURE(DBGU_STANDARD, 9600, BOARD_MCK);
printf("-- Getting Started Project %s --\n\r", SOFTPACK_VERSION);
printf("-- %s\n\r", BOARD_NAME);
printf("-- Compiled: %s %s --\n\r", __DATE__, __TIME__);
printf("Sasha's compilation\n\r");
// Configure led
m_pPio->PIO_SODR = BIT18; // Set PA18 to HIGH -> led off
m_pPio->PIO_OER = BIT18; // Configure PA8 as output
//Configure PIO
PIO_Configure(pins, PIO_LISTSIZE(pins));
AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PWMC;
printf("1\n\r");
// Settings:
// - 100kHz PWM period (PWM_FREQUENCY)
// - 1s rise/fall time for the LED intensity
PWMC_ConfigureClocks(PWM_FREQUENCY * MAX_DUTY_CYCLE, 0, BOARD_MCK);
printf("2\n\r");
// Configure PWMC channel 0 (left-aligned)
PWMC_ConfigureChannel(CHANNEL_PWM0, AT91C_PWMC_CPRE_MCKA, 0, 0);
PWMC_SetPeriod(CHANNEL_PWM0, MAX_DUTY_CYCLE);
PWMC_SetDutyCycle(CHANNEL_PWM0, 3);
//моргаем светодиодом для проверки работоспособности
unsigned long i;
for(i = 0; i < 25; i++)
{
m_pPio->PIO_CODR = BIT18;
Delay(1000000);
m_pPio->PIO_SODR = BIT18;
Delay(1000000);
}
// Configure interrupt on PWM channels #0
IRQ_ConfigureIT(AT91C_ID_PWMC, 0, ISR_Pwmc);
IRQ_EnableIT(AT91C_ID_PWMC);
PWMC_EnableChannelIt(CHANNEL_PWM0);
PWMC_EnableChannel(CHANNEL_PWM0);
//__enable_interrupt(); //пробовал, непомогло
printf("9\n\r");
// Main loop
while (1)
{
}
}
Не входит в прерывание от ШИМа
Dec 3 2010, 21:44
