How many types of interrupts are present in Arduino. I know only three interrupt:
External Interrupt
Pin Change Interrupt
Timer Interrupt
Is there any more interrupt apart from the above?
There are lots more.
They're all listed in the datasheet; for example on the '328p as used in the Uno et al, that's table 12-6
Each timer has 3 (the two compare matches, and overflow), timer1 also has one for input capture. The ADC has one for use when it's in freerunning mode, there are three for the UART; most other on-chip peripherals have one associated with them too... 26 on the '328p in all.
The 2560 (on the mega) has 57 in all...
Hii DrAzzy,
I am using Arduino Due and i am looking into datasheet of ARM cortex M3 Processor.
Yeah, it'll probably have an even more extensive selection of interrupts. You should always mention when you're using something that's not an AVR here; people generally assume AVRs unless stated otherwise.
The SAM3X seems to have on the order of 50 interrupt vectors, including the system "exceptions" like NMI and BusFault. That's a bit strange as I could swear that elsewhere it says that the CM3 supports "up to 30 interrupts", but...
This is from packages/arduino/hardware/sam/1.6.11/system/CMSIS/Device/ATMEL/sam3xa/source/as_gcc/startup_sam3xa.c
(not all of these interrupts are USED by the Arduino environment, but they're certainly all "present")
const DeviceVectors exception_table = {
/* Configure Initial Stack Pointer, using linker-generated symbols */
(void*) (&_estack),
(void*) Reset_Handler,
(void*) NMI_Handler,
(void*) HardFault_Handler,
(void*) MemManage_Handler,
(void*) BusFault_Handler,
(void*) UsageFault_Handler,
(void*) (0UL), /* Reserved */
(void*) (0UL), /* Reserved */
(void*) (0UL), /* Reserved */
(void*) (0UL), /* Reserved */
(void*) SVC_Handler,
(void*) DebugMon_Handler,
(void*) (0UL), /* Reserved */
(void*) PendSV_Handler,
(void*) SysTick_Handler,
/* Configurable interrupts */
(void*) SUPC_Handler, /* 0 Supply Controller */
(void*) RSTC_Handler, /* 1 Reset Controller */
(void*) RTC_Handler, /* 2 Real Time Clock */
(void*) RTT_Handler, /* 3 Real Time Timer */
(void*) WDT_Handler, /* 4 Watchdog Timer */
(void*) PMC_Handler, /* 5 PMC */
(void*) EFC0_Handler, /* 6 EFC 0 */
(void*) EFC1_Handler, /* 7 EFC 1 */
(void*) UART_Handler, /* 8 UART */
(void*) SMC_Handler, /* 9 SMC */
(void*) SDRAMC_Handler, /* 10 SDRAMC */
(void*) PIOA_Handler, /* 11 Parallel IO Controller A */
(void*) PIOB_Handler, /* 12 Parallel IO Controller B */
(void*) PIOC_Handler, /* 13 Parallel IO Controller C */
(void*) PIOD_Handler, /* 14 Parallel IO Controller D */
(void*) PIOE_Handler, /* 15 Parallel IO Controller E */
(void*) PIOF_Handler, /* 16 Parallel IO Controller F */
(void*) USART0_Handler, /* 17 USART 0 */
(void*) USART1_Handler, /* 18 USART 1 */
(void*) USART2_Handler, /* 19 USART 2 */
(void*) USART3_Handler, /* 20 USART 3 */
(void*) HSMCI_Handler, /* 21 MCI */
(void*) TWI0_Handler, /* 22 TWI 0 */
(void*) TWI1_Handler, /* 23 TWI 1 */
(void*) SPI0_Handler, /* 24 SPI 0 */
(void*) SPI1_Handler, /* 25 SPI 1 */
(void*) SSC_Handler, /* 26 SSC */
(void*) TC0_Handler, /* 27 Timer Counter 0 */
(void*) TC1_Handler, /* 28 Timer Counter 1 */
(void*) TC2_Handler, /* 29 Timer Counter 2 */
(void*) TC3_Handler, /* 30 Timer Counter 3 */
(void*) TC4_Handler, /* 31 Timer Counter 4 */
(void*) TC5_Handler, /* 32 Timer Counter 5 */
(void*) TC6_Handler, /* 33 Timer Counter 6 */
(void*) TC7_Handler, /* 34 Timer Counter 7 */
(void*) TC8_Handler, /* 35 Timer Counter 8 */
(void*) PWM_Handler, /* 36 PWM */
(void*) ADC_Handler, /* 37 ADC controller */
(void*) DACC_Handler, /* 38 DAC controller */
(void*) DMAC_Handler, /* 39 DMA Controller */
(void*) UOTGHS_Handler, /* 40 USB OTG High Speed */
(void*) TRNG_Handler, /* 41 True Random Number Generator */
(void*) EMAC_Handler, /* 42 Ethernet MAC */
(void*) CAN0_Handler, /* 43 CAN Controller 0 */
(void*) CAN1_Handler /* 44 CAN Controller 1 */
};
Do these sophisticated AVR devices support TRAP interrupt like 80x86 for the execution of a single instruction in order to debug a malfunctioning program?
Do these sophisticated AVR devices support TRAP interrupt
No. There's a way to single-step instructions using the debugWire or JTAG connection, but it's not documented.
There is also a hack where you use one of the external interrupt pins, tied to GND and set to interrupt on "low level", which causes continuous interrupts. Since the AVR allows one instruction to execute after enabling interrupts before the next interrupt can occur, this has the effect of calling the ISR after every instruction in the non-interrupt context.
@westfw - Apr 10, 2017, 08:59 pm
The later method (continuous interrupts) is an interesting one. Similar idea has been documented in the data sheets of 8051, which I implemented in the 8051 Learning System. But, there is a little bit difference between your idea and the 8051's idea: 8051's prescribed method allows injection of External Interrupt Signal at the user's discretion (non-continuous) by pressing a normally open switch. You have prescribed continuous interrupt.
Anyway, I hope I will try to experiment your idea on the RMCKIT (ATmega32) which supports AVR Studio 4 to create binary codes out-of-assembly. Does ArduinoUNO IDE allow to import external hex-file (created from ASM) and upload it into the flash of ATmega328 using Arduino's IDE.
I have the understanding that an AVR like 80x86 (not 8085) is not interrupted during the execution of reti instruction. Am I right?
I have the understanding that an AVR like 80x86 (not 8085) is not interrupted during the execution of reti instruction. Am I right?
Interrupts are disabled upon entering the interrupt, and enabled as part of the "return from interrupt" instruction. The re-enable takes effect one instruction after the RETI...