El PC13 EXTI interrupt (EXTI15_10) configurado aquí no dispara ninguna parada. La mayoría de las demás preguntas sobre este mismo tema indican que el bit pendiente EXTI_PR respectivo debe borrarse en el ISR. Estoy limpiando el bit en mi código.
La placa nucleo-103rb conecta GPIO PC13 a un botón de usuario que estoy usando para toogle la interrupción del temporizador que parpadea el LED entre 1 segundo y .5 segundo. La placa tiene un capacitor / resistencia de desalojador, así que no creo que el problema sea una señal sucia. Incluso sin tocar el botón, el ISR sigue disparando.
Además, en mi sesión de depuración gdb, si desactivo el desencadenante de borde set *EXTI_FTSR = (unsigned int)0x00000000 , la placa sale del ISR y se instala en el bucle while(1) , el LED parpadea y todo. Luego, en la sesión de depuración, establecí un programa de software EXTI set *0x40010410 = 0x00002000 , luego, después de continuar, el ISR de EXTI cambia la velocidad del LED y vuelve al tiempo (1) sin problema.
No puedo explicar por qué el EXTI ISR sigue disparando sin parar.
El código:
#define _stackInit 0x20005000U
// RCC base 0x40021000
volatile unsigned int * const RCC_APB2ENR = (unsigned int *)0x40021018; // offset 0x18 APB2ENR
volatile unsigned int * const RCC_APB1ENR = (unsigned int *)0x4002101c; // offset 0x1c APB1ENR
// GPIOA base 0x40010800
volatile unsigned int * const GPIOA_CRL = (unsigned int *)0x40010800; // offset 0x00 CRL
volatile unsigned int * const GPIOA_ODR = (unsigned int *)0x4001080c; // offset 0x0c ODR
// GPIOC base 0x40011000
volatile unsigned int * const GPIOC_CRL = (unsigned int *)0x40011000; // offset 0x00 CRL
volatile unsigned int * const GPIOC_CRH = (unsigned int *)0x40011004; // offset 0x04 CRH
volatile unsigned int * const GPIOC_IDR = (unsigned int *)0x40011008; // offset 0x08 IDR
volatile unsigned int * const GPIOC_ODR = (unsigned int *)0x4001100c; // offset 0x0c ODR
// TIM2 base 0x40000000
volatile unsigned int * const TIM2_CR1 = (unsigned int *)0x40000000; // offset 0x00 CR1
volatile unsigned int * const TIM2_PSC = (unsigned int *)0x40000028; // offset 0x28 PSC
volatile unsigned int * const TIM2_DIER = (unsigned int *)0x4000000c; // offset 0x0c DIER
volatile unsigned int * const TIM2_ARR = (unsigned int *)0x4000002c; // offset 0x2c ARR
volatile unsigned int * const TIM2_SC = (unsigned int *)0x40000010; // offset 0x10 SC
// NVIC base 0xE000E100
volatile unsigned int * const NVIC_ISER0 = (unsigned int *)0xE000E100; // offset 0x00 ISER0
volatile unsigned int * const NVIC_ISER1 = (unsigned int *)0xE000E104; // offset 0x04 ISER1
// EXIT base 0x40010400
volatile unsigned int * const EXTI_IMR = (unsigned int *)0x40010400; // offset 0x00 IMR
volatile unsigned int * const EXTI_FTSR = (unsigned int *)0x4001040c; // offset 0x0c FTSR
volatile unsigned int * const EXTI_PR = (unsigned int *)0x40010414; // offset 0x14 PR
int c_entry()
{
// enable GPIOA clock and set PB5 to output
*RCC_APB2ENR |= (unsigned int)0x00000004;
*GPIOA_CRL = (unsigned int)0x44244444;
// enable GPIOC clock and set PC13 to input with pull up
*RCC_APB2ENR |= (unsigned int)0x00000010;
*GPIOC_CRH = (unsigned int)0x44844444;
// enable EXTI on PC13
*EXTI_IMR |= (unsigned int)0x00002000;
*EXTI_FTSR |= (unsigned int)0x00002000;
// enable TIM2 clock and configure the timer interrupt
*RCC_APB1ENR |= (unsigned int)0x00000001;
*TIM2_PSC = (unsigned short)0x00ff;
*TIM2_ARR = (unsigned short)31250u;
*TIM2_DIER = (unsigned short)0x0001;
*TIM2_CR1 = (unsigned short)0x0001;
// enable TIM2 global interrupt in NVIC
*NVIC_ISER0 |= (unsigned int)(0x01<<0x1c); //0x1c, TIM2 global interrupt position 28
// enable TIM2 global interrupt in NVIC
*NVIC_ISER1 |= (unsigned int)(0x01<<0x08); //0x08, EXTI_15_10 interrupt position 40
while(1);
//return 0;
}
void TIM2_IRQHandler()
{
//toggle PA5
*GPIOA_ODR ^= 0x20u;
// clear TIM2 int pending bit
*TIM2_SC &= ~(unsigned short)0x0001;
}
void EXTI15_10_IRQHandler()
{
if (*TIM2_ARR == (unsigned short)31250u){
*TIM2_ARR = (unsigned short)15625u;
} else {
*TIM2_ARR = (unsigned short)31250u;
}
*EXTI_PR = (unsigned int)0x00002000;
}
// Begin and End addresses for the .bss section; symbols defined in linker script
extern unsigned int __bss_start__;
extern unsigned int __bss_end__;
void __attribute__ ((section(".after_vectors"))) Reset_Handler (void)
{
// Initialize bss section by iterating and clearing word by word.
// It is assumed that the pointers are word aligned.
unsigned int *p = &__bss_start__;
while (p < &__bss_end__) {
*p++ = 0;
}
c_entry();
}
void __attribute__ ((section(".after_vectors"))) Default_Handler(void)
{
while(1);
}
// cortex-m core exceptions
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) NMI_Handler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) HardFault_Handler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) MemManage_Handler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) BusFault_Handler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) UsageFault_Handler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) SVC_Handler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DebugMon_Handler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) PendSV_Handler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) SysTick_Handler(void);
// chip level interrupts
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) WWDG_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) PVD_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TAMPER_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) RTC_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) FLASH_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) RCC_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) EXTI0_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) EXTI1_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) EXTI2_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) EXTI3_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) EXTI4_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DMA1_Channel1_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DMA1_Channel2_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DMA1_Channel3_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DMA1_Channel4_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DMA1_Channel5_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DMA1_Channel6_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DMA1_Channel7_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) ADC1_2_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) USB_HP_CAN1_TX_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) USB_LP_CAN1_RX0_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) CAN1_RX1_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) CAN1_SCE_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) EXTI9_5_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM1_BRK_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM1_UP_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM1_TRG_COM_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM1_CC_IRQHandler(void);
//void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM2_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM3_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM4_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) I2C1_EV_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) I2C1_ER_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) I2C2_EV_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) I2C2_ER_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) SPI1_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) SPI2_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) USART1_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) USART2_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) USART3_IRQHandler(void);
//void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) EXTI15_10_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) RTCAlarm_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) USBWakeUp_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM8_BRK_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM8_UP_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM8_TRG_COM_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM_CC_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) ADC3_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) FSMC_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) SDIO_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM5_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) SPI3_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) UART4_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) UART5_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM6_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) TIM7_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DMA2_Channel1_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DMA2_Channel2_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DMA2_Channel3_IRQHandler(void);
void __attribute__ ((section(".after_vectors"),weak, alias ("Default_Handler"))) DMA2_Channel4_5_IRQHandler(void);
typedef void(* const pHandler)(void);
// The vector table.
// The linker script to place at correct location in memory.
__attribute__ ((section(".isr_vector"),used)) pHandler __isr_vectors[] =
{
//core exceptions
(pHandler)_stackInit, // Inital Stack Pointer
Reset_Handler, // reset handler
NMI_Handler, // NMI handler
HardFault_Handler, // hard fault handler
MemManage_Handler, // MPU fault handler
BusFault_Handler, // bus fault handler
UsageFault_Handler, // usage fault handler
0x00, // reserved
0x00, // reserved
0x00, // reserved
0x00, // reserved
SVC_Handler, // SVCall handler
DebugMon_Handler, // debug monitor handler
0x00, // reserved
PendSV_Handler, // PendSV handler
SysTick_Handler, // systick handler
// chip level interrupts
WWDG_IRQHandler, /* Window Watachdog */
PVD_IRQHandler, /* PVD EXTI Line Detect */
TAMPER_IRQHandler, /* Tamper */
RTC_IRQHandler, /* RTC Global */
FLASH_IRQHandler, /* Flash Global */
RCC_IRQHandler, /* RCC Global */
EXTI0_IRQHandler, /* EXTI Line 0 */
EXTI1_IRQHandler, /* EXTI Line 1 */
EXTI2_IRQHandler, /* EXTI Line 2 */
EXTI3_IRQHandler, /* EXTI Line 3 */
EXTI4_IRQHandler, /* EXTI Line 4 */
DMA1_Channel1_IRQHandler, /* DMA1 Channel1 Global */
DMA1_Channel2_IRQHandler, /* DMA1 Channel2 Global */
DMA1_Channel3_IRQHandler, /* DMA1 Channel3 Global */
DMA1_Channel4_IRQHandler, /* DMA1 Channel4 Global */
DMA1_Channel5_IRQHandler, /* DMA1 Channel5 Global */
DMA1_Channel6_IRQHandler, /* DMA1 Channel6 Global */
DMA1_Channel7_IRQHandler, /* DMA1 Channel7 Global */
ADC1_2_IRQHandler, /* ADC1 and ADC2 Global */
USB_HP_CAN1_TX_IRQHandler, /* USB High Priority or CAN TX */
USB_LP_CAN1_RX0_IRQHandler, /* USB Low Priority or CAN RX0 */
CAN1_RX1_IRQHandler, /* CAN RX1 */
CAN1_SCE_IRQHandler, /* CAN SCE */
EXTI9_5_IRQHandler, /* EXTI Line[9:5] */
TIM1_BRK_IRQHandler, /* TIM1 Break */
TIM1_UP_IRQHandler, /* TIM1 Update */
TIM1_TRG_COM_IRQHandler, /* TIM1 Trigger and Commutation */
TIM1_CC_IRQHandler, /* TIM1 Capture Compare */
TIM2_IRQHandler, /* TIM2 Global */
TIM3_IRQHandler, /* TIM3 Global */
TIM4_IRQHandler, /* TIM4 Global */
I2C1_EV_IRQHandler, /* I2C1 Event */
I2C1_ER_IRQHandler, /* I2C1 Error */
I2C2_EV_IRQHandler, /* I2C2 Event */
I2C2_ER_IRQHandler, /* I2C2 Error */
SPI1_IRQHandler, /* SPI1 Global */
SPI2_IRQHandler, /* SPI2 Global */
USART1_IRQHandler, /* USART1 Global */
USART2_IRQHandler, /* USART2 Global */
USART3_IRQHandler, /* USART3 Global */
EXTI15_10_IRQHandler, /* EXTI Line[15:10] */
RTCAlarm_IRQHandler, /* RTC Alarm EXTI Line */
USBWakeUp_IRQHandler, /* USB WakeUp EXTI Line */
TIM8_BRK_IRQHandler, /* TIM8 Break */
TIM8_UP_IRQHandler, /* TIM8 Update */
TIM8_TRG_COM_IRQHandler, /* TIM8 Trigger and Commutation */
TIM_CC_IRQHandler, /* TIM8 Capture Compare */
ADC3_IRQHandler, /* ADC3 Global */
FSMC_IRQHandler, /* FSMC Global */
SDIO_IRQHandler, /* SDIO Global */
TIM5_IRQHandler, /* TIM5 Global */
SPI3_IRQHandler, /* SPI3 Global */
UART4_IRQHandler, /* UART4 Global */
UART5_IRQHandler, /* UART5 Global */
TIM6_IRQHandler, /* TIM6 Global */
TIM7_IRQHandler, /* TIM7 Global */
DMA2_Channel1_IRQHandler, /* DMA2 Channel1 global */
DMA2_Channel2_IRQHandler, /* DMA2 Channel2 global */
DMA2_Channel3_IRQHandler, /* DMA2 Channel3 global */
};
El script del enlazador:
NTRY(Reset_Handler)
MEMORY
{
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 20K
FLASH (rx) : ORIGIN = 0x8000000, LENGTH = 128K
}
SECTIONS
{
.text :
{
*(.isr_vector)
*(.after_vectors)
*(.text)
} > FLASH
.bss :
{
__bss_start__ = .; /* symbol for c code to initialize bss section */
*(.bss)
*(COMMON)
__bss_end__ = .; /* symbol for c code to initialize bss section */
} > RAM
}
Está construido con:
/opt/gcc-arm-none-eabi-7-2017-q4-major/bin/arm-none-eabi-gcc -c -mcpu=cortex-m3 -mthumb -g main.c -o main.o
/opt/gcc-arm-none-eabi-7-2017-q4-major/bin/arm-none-eabi-ld -T main.ld -Map main.map --cref main.o -o main.elf
He condensado todo el código en un solo archivo para facilitar la publicación como una pregunta.