PICO_DEFAULT_IRQ_PRIORITY macro

\file irq.h Hardware interrupt handling API The RP2040 uses the standard ARM nested vectored interrupt controller (NVIC). Interrupts are identified by a number from 0 to 31. On the RP2040, only the lower 26 IRQ signals are connected on the NVIC; IRQs 26 to 31 are tied to zero (never firing). There is one NVIC per core, and each core's NVIC has the same hardware interrupt lines routed to it, with the exception of the IO interrupts where there is one IO interrupt per bank, per core. These are completely independent, so, for example, processor 0 can be interrupted by GPIO 0 in bank 0, and processor 1 by GPIO 1 in the same bank. There are three different ways to set handlers for an IRQ: - Calling irq_add_shared_handler() at runtime to add a handler for a multiplexed interrupt (e.g. GPIO bank) on the current core. Each handler, should check and clear the relevant hardware interrupt source - Calling irq_set_exclusive_handler() at runtime to install a single handler for the interrupt on the current core - Defining the interrupt handler explicitly in your application (e.g. by defining void `isr_dma_0` will make that function the handler for the DMA_IRQ_0 on core 0, and you will not be able to change it using the above APIs at runtime). Using this method can cause link conflicts at runtime, and offers no runtime performance benefit (i.e, it should not generally be used). \section interrupt_nums Interrupt Numbers A set of defines is available (intctrl.h) with these names to avoid using the numbers directly. \if rp2040_specific On RP2040 the interrupt numbers are as follows: IRQ | Interrupt Source ----|----------------- 0 | TIMER_IRQ_0 1 | TIMER_IRQ_1 2 | TIMER_IRQ_2 3 | TIMER_IRQ_3 4 | PWM_IRQ_WRAP 5 | USBCTRL_IRQ 6 | XIP_IRQ 7 | PIO0_IRQ_0 8 | PIO0_IRQ_1 9 | PIO1_IRQ_0 10 | PIO1_IRQ_1 11 | DMA_IRQ_0 12 | DMA_IRQ_1 13 | IO_IRQ_BANK0 14 | IO_IRQ_QSPI 15 | SIO_IRQ_PROC0 16 | SIO_IRQ_PROC1 17 | CLOCKS_IRQ 18 | SPI0_IRQ 19 | SPI1_IRQ 20 | UART0_IRQ 21 | UART1_IRQ 22 | ADC0_IRQ_FIFO 23 | I2C0_IRQ 24 | I2C1_IRQ 25 | RTC_IRQ \endif \if rp2350_specific On RP2350 the interrupt numbers are as follows: IRQ | Interrupt Source ----|----------------- 0 | TIMER0_IRQ_0 1 | TIMER0_IRQ_1 2 | TIMER0_IRQ_2 3 | TIMER0_IRQ_3 4 | TIMER1_IRQ_0 5 | TIMER1_IRQ_1 6 | TIMER1_IRQ_2 7 | TIMER1_IRQ_3 8 | PWM_IRQ_WRAP_0 9 | PWM_IRQ_WRAP_1 10 | DMA_IRQ_0 11 | DMA_IRQ_1 12 | DMA_IRQ_2 13 | DMA_IRQ_3 14 | USBCTRL_IRQ 15 | PIO0_IRQ_0 16 | PIO0_IRQ_1 17 | PIO1_IRQ_0 18 | PIO1_IRQ_1 19 | PIO2_IRQ_0 20 | PIO2_IRQ_1 21 | IO_IRQ_BANK0 22 | IO_IRQ_BANK0_NS 23 | IO_IRQ_QSPI 24 | IO_IRQ_QSPI_NS 25 | SIO_IRQ_FIFO 26 | SIO_IRQ_BELL 27 | SIO_IRQ_FIFO_NS 28 | SIO_IRQ_BELL_NS 29 | SIO_IRQ_MTIMECMP 30 | CLOCKS_IRQ 31 | SPI0_IRQ 32 | SPI1_IRQ 33 | UART0_IRQ 34 | UART1_IRQ 35 | ADC_IRQ_FIFO 36 | I2C0_IRQ 37 | I2C1_IRQ 38 | OTP_IRQ 39 | TRNG_IRQ 40 | PROC0_IRQ_CTI 41 | PROC1_IRQ_CTI 42 | PLL_SYS_IRQ 43 | PLL_USB_IRQ 44 | POWMAN_IRQ_POW 45 | POWMAN_IRQ_TIMER 46 | SPAREIRQ_IRQ_0 47 | SPAREIRQ_IRQ_1 48 | SPAREIRQ_IRQ_2 49 | SPAREIRQ_IRQ_3 50 | SPAREIRQ_IRQ_4 51 | SPAREIRQ_IRQ_5 \endif